HP LT3200 LT3700 LT4200 LT4700 Service Manual

High-Definition LCD TV Service Manual Models: LT3200, LT3700, LT4200, LT4700 Downloaded from www.Manualslib.com manuals search engine

Copyright 2007, 2008 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and other countries. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein. This document contains proprietary information that is protected by copyright. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Hewlett-Packard Company. Service Reference Guide Business PCs Second Edition (April 2008) First Edition (June 2007) Document Part Number: 454404-002 Downloaded from www.Manualslib.com manuals search engine

HP High-Definition LCD TV Service Manual iii Table of Contents High-Definition LCD TV Service Manual ................................................................................................................ 1 Models: LT3200, LT3700, LT4200, LT4700 ................................................................................................................. 1 Table of Contents........................................................................................................................................................ iii Important Service Safety Precautions ....................................................................................................................... 1 Warnings and Cautions ................................................................................................................................................. 1 Safe Handling and Servicing......................................................................................................................................... 2 Repair Tips ............................................................................................................................................................... 3 About Lead-Free Solder ........................................................................................................................................... 3 Suggested Pb-Free Solder ........................................................................................................................................ 4 Servicing of Surface-Mounted Devices (SMDs) ...................................................................................................... 4 Rework on Ball Grid Array (BGA) ICs.................................................................................................................... 5 Product Information and Specifications ................................................................................................................... 6 Product Information ...................................................................................................................................................... 6 Product Profile ......................................................................................................................................................... 6 Specifications ................................................................................................................................................................ 6 LCD Panel Module................................................................................................................................................... 6 General TV Specifications LT3200 and LT3700 ..................................................................................................... 7 General TV Specifications LT4200 and LT4700 ..................................................................................................... 9 I/O Connectors ........................................................................................................................................................11 Factory Preset Display Modes.................................................................................................................................11 Controlling the Onscreen Display .......................................................................................................................... 12 TV Indicators and Controls .................................................................................................................................... 12 Remote Control ...................................................................................................................................................... 13 TV Connectors ....................................................................................................................................................... 14 Connectors.............................................................................................................................................................. 17 Basic Operation ......................................................................................................................................................... 20 Basic Operation........................................................................................................................................................... 20 OSD (On-Screen Display) Functions – Simplemenu ............................................................................................ 20 OSD Functions – Fullmenu ................................................................................................................................... 21 Command Table RS-232 ............................................................................................................................................. 25 Return messages.......................................................................................................................................................... 32 Special command extension ................................................................................................................................... 32 Replaceable Parts ...................................................................................................................................................... 33 Parts List by Model ..................................................................................................................................................... 33 Model LT3200 ........................................................................................................................................................ 33 Model LT3700 ....................................................................................................................................................... 34 Model LT4200 ....................................................................................................................................................... 35 Model LT4700 ....................................................................................................................................................... 36 Replacement Parts List Reference Pictures ............................................................................................................ 37 Removal and Replacement ....................................................................................................................................... 42 Equipment and Tools Needed for Removal and Replacement .................................................................................... 42 Downloaded from www.Manualslib.com manuals 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iv HP High-Definition LCD TV Service Manual Tools ....................................................................................................................................................................... 42 After Service Checklist .......................................................................................................................................... 42 Basic Adjustment Settings ...................................................................................................................................... 42 Four Models – Comparison Pictures ........................................................................................................................... 43 LT3200 ................................................................................................................................................................... 43 LT3700 ................................................................................................................................................................... 43 LT4200 ................................................................................................................................................................... 44 LT4700 ................................................................................................................................................................... 44 Removal Procedures ................................................................................................................................................... 45 Removal Order ....................................................................................................................................................... 45 Screws .................................................................................................................................................................... 45 Removing the Pedestal ........................................................................................................................................... 46 Disassembling the Pedestal .................................................................................................................................... 47 Removing the Back Cover ..................................................................................................................................... 48 Removing the Function Keyboard.......................................................................................................................... 49 Removing the Infrared Board ................................................................................................................................. 50 Removing the Wall Mount Brackets ...................................................................................................................... 51 Removing the Board Cover .................................................................................................................................... 52 Removing the Main Board ..................................................................................................................................... 52 Removing the Power Supply .................................................................................................................................. 56 Removing the Main Bracket................................................................................................................................... 60 Removing the Inverters .......................................................................................................................................... 61 Removing the Speakers .......................................................................................................................................... 64 Removing the Control Board ................................................................................................................................. 66 Removing the Front Bezel...................................................................................................................................... 70 Diagnostics ................................................................................................................................................................. 71 LED Indicators ....................................................................................................................................................... 71 Software version information...................................................................................................................................... 71 How to run diagnostics ............................................................................................................................................... 71 How to get back to normal TV operation after running diagnostics ........................................................................... 72 Installation menu......................................................................................................................................................... 72 Hotel mode .................................................................................................................................................................. 73 How to enable and disable...................................................................................................................................... 74 Troubleshooting ......................................................................................................................................................... 75 Remote Control ........................................................................................................................................................... 75 Function Key............................................................................................................................................................... 76 Power: TV Does Not Turn On..................................................................................................................................... 77 Audio .......................................................................................................................................................................... 78 VGA Input................................................................................................................................................................... 79 HDMI Input ................................................................................................................................................................ 80 DVI Input .................................................................................................................................................................... 81 YPbPr Input ................................................................................................................................................................ 82 TV/Video/S-video Input .............................................................................................................................................. 83 Troubleshooting Tips .................................................................................................................................................. 84 No Power................................................................................................................................................................ 84 No Video ................................................................................................................................................................ 84 Downloaded from www.Manualslib.com manuals search engine

HP High-Definition LCD TV Service Manual v Keypad abnormal ................................................................................................................................................... 84 LED Display abnormal........................................................................................................................................... 84 Abnormal Display .................................................................................................................................................. 84 LED Display abnormal........................................................................................................................................... 85 LCD Panel Troubleshooting Tips ................................................................................................................................ 85 Inverter board ......................................................................................................................................................... 85 Control board (panel driver) ................................................................................................................................... 85 LVDS cable ............................................................................................................................................................ 85 Screen ..................................................................................................................................................................... 85 Example of defective LCDs ................................................................................................................................... 86 Chassis Layout and Overall Wiring Diagrams ....................................................................................................... 89 Boards Layout (Typical of all models except 32-inch*) ............................................................................................. 89 Connectors .................................................................................................................................................................. 90 Main Board............................................................................................................................................................. 90 Keypad and IR Boards ........................................................................................................................................... 91 Wires and Cables Wiring ............................................................................................................................................ 92 Main Board............................................................................................................................................................. 92 Wiring Diagram .......................................................................................................................................................... 93 Firmware Update Procedure.................................................................................................................................... 94 Overview..................................................................................................................................................................... 94 Safe Software Update Procedure ................................................................................................................................ 94 Introduction ............................................................................................................................................................ 94 Software Feature Requirement ............................................................................................................................... 95 Software Update Procedure......................................................................................................................................... 95 Limitation of this Implementation .......................................................................................................................... 95 Downloaded from www.Manualslib.com manuals search engine

vi HP High-Definition LCD TV Service Manual Downloaded from www.Manualslib.com manuals search engine

HP High-Definition LCD TV Service Manual 1 BEFORE SERVICING THE LCD MODULE, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. WHEN REPLACEMENT PARTS ARE REQUIRED, BE SURE TO USE REPLACEMENT PARTS SPECIFIED BY THE MANUFACTURER. Proper service and repair is important to the safe, reliable operation of all HP equipment. The service procedures recommended by HP and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specifically designed for their purpose, and should be used as recommended. It is important to note that this manual contains various Cautions and Notices that should be carefully read in order to minimize the risk of personal injury to service personnel. Improper service methods may damage the equipment. It is also important to understand that these Cautions and Notices are not exhaustive. HP could not possibly know, evaluate, and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, HP has not undertaken any such broad evaluation. Service technicians who use service procedures or tools that are not recommended by HP must exercise caution and be sure that neither their safety nor the safe operation of the equipment will be jeopardized by the service method selected. Warnings and Cautions WARNING: Critical components having special safety characteristics are identified with a by the reference number in the parts list. WARNING: Use of substitute replacement parts, which do not have the same specified safety characteristics, may create shock, fire, or other hazards. Under no circumstances should the original design be modified or altered without written permission from HP. HP assumes no liability, express or implied, arising out of any unauthorized modification of design. The service technician assumes all liability. CAUTION: To ensure the continued reliability of this product, use only the original manufacturer’s replacement parts, which are listed with their part numbers in the “Replaceable Parts List” section of this service manual. WARNING: All ICs and many other semiconductors are susceptible to electrostatic discharges (ESDs). Careless handling during repair can be life-threatening. When repairing, make sure that you are connected with the same potential as the mass of the set by a wristband with resistance. Keep components and tools also at this same potential. WARNING: 1 Never replace modules or other components while the unit is turned on. 2 When making settings, use plastic rather than metal tools. This will prevent any short circuits and the danger of a circuit becoming unstable. WARNING: To prevent electrical shock, do not use the polarized AC plug with an extension cord, receptacle, or the outlet unless the blades can be fully inserted to prevent blade exposure. To prevent electrical shock, match the wide blade or plug to a wide slot and fully insert. WARNING: When replacement parts are required, be sure to use replacement parts specified by the manufacturer or have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards. Important Service Safety Precautions Downloaded from www.Manualslib.com manuals search engine

2 HP High-Definition LCD TV Service Manual WARNINGS: Safety regulations require that after a repair the set must be returned in its original condition. In particular attention should be paid to the following points: NOTE: The wiring should be routed correctly and fixed with the mounted cable clamps. The insulation of the main leads should be checked for external damage. • Do not touch the signal and the power connector while this product is operating. Do not touch the EMI ground part and the heat sink of the film filter. • Do not supply a voltage higher than that specified to this product. This may damage the product and may cause a fire. • Do not use this product in locations where the humidity is extremely high, where it may be splashed with water, or where flammable materials surround it. Do not install or use the product in a location that does not satisfy the specified environmental conditions. This may damage the product and may cause a fire. • If a foreign substance (such as water, metal, or liquid) gets inside the panel module, immediately turn off the power. Continuing to use the product, may cause fire or electric shock. • If the product emits smoke or an abnormal smell, or it makes an abnormal sound, immediately turn off the power. Continuing to use the product, may cause fire or electric shock. • Do not disconnect or connect the connector while power to the product is on. It takes some time for the voltage to drop to a sufficiently low level after the power has been turned off. Confirm that the voltage has dropped to a safe level before disconnecting or connecting the connector. • Do not pull out or insert the power cable from or to an outlet with wet hands. It may cause electric shock. • Do not damage or modify the power cable. It may cause fire or electric shock. • If the power cable is damaged, or if the connector is loose, do not use the product; this can lead to fire or electric shock. • If the power connector or the connector of the power cable becomes dirty or dusty, wipe it with a dry cloth. Continuing to use the product may cause fire or electric shock. • The LCD module uses a high-voltage (maximum 450V DC). Be cautious of electric shock and do not touch the device circuitry when handling the LCD unit. Because the capacitor of the device circuitry may remain charged at the moment of power off, standing by for 1 minute is strongly recommended before touching the device circuitry. • Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. Safe Handling and Servicing The work procedures shown with the Warning symbol are important for ensuring the safety of the product and the servicing work. Be sure to follow these instructions. • Before starting the work, secure a sufficient workspace. • At all times, other than when adjusting and checking the product, be sure to turn off the Power button and disconnect the power cable from the power source of the TV during servicing. • To prevent electric shock and breakage of PC board, start the servicing work at least 30 seconds after the main power has been turned off. Especially when installing and removing the power supply board and the SUS board, which involve high voltages, start servicing at least 2 minutes after the main power has been turned off. • While the main power is on, do not touch any parts or circuits other than the ones specified. The high-voltage power supply block within the LCD module has a floating ground. If any connection other than the one specified is made between the measuring equipment and the high voltage power supply block, it can result in electric shock or activation of the leakage-detection circuit breaker. • When installing the LCD module into and removing it from the packing carton, be sure to have at least two people perform the work while being careful to ensure that the flexible printed-circuit cable of the LCD module does not get caught by the packing carton. • When the surface of the panel comes into contact with the cushioning materials, be sure that there is no foreign matter on top of the cushioning materials. Foreign matter may scratch the surface of the panel. • Be sure to remove static electricity from your body before handling the circuit board. • Be sure to handle the circuit board by holding the large parts such as the heat sink or transformer. Failure to observe this precaution may result in the occurrence of an abnormality in the soldered areas. Downloaded from www.Manualslib.com manuals search engine

HP High-Definition LCD TV Service Manual 3 • Do not stack the circuit boards. Failure to observe this precaution may result in problems resulting from scratches on the parts, the deformation of parts, and short-circuits due to residual electric charge. • Routing the wires and fixing them in position must be done in accordance with the original routing and fixing configuration when servicing is completed. All the wires are routed far away from the areas that become hot (such as the heat sink). These wires are fixed in position with the wire clamps so that the wires do not move, thereby ensuring that they are not damaged and their materials do not deteriorate over long periods of time. Therefore, route the cables and fix the cables to the original position and states using the wire clamps. • Perform a safety check when servicing is completed. Verify that the peripherals of the serviced points have not undergone any deterioration during servicing. Also verify that the screws, parts, and cables removed for servicing purposes have all been returned to their proper locations in accordance with the original setup. • A glass plate protects the LCD display. This glass plate can be cleaned with a slightly moist cloth. If dirt appears between the glass plate and the LCD display panel have only a qualified service employee clean it. Repair Tips WARNING: All ICs and many other semiconductors are susceptible to electrostatic discharges (ESDs). Careless handling during repair can be life-threatening. When repairing, make sure that you are connected with the same potential as the mass of the unit via a wrist wrap with resistance. Keep components and tools also at the same potential. About Lead-Free Solder NOTE: LEAD IS LISTED AS (PB) IN THE PERIODIC TABLE OF THE ELEMENTS. IN THE INFORMATION THAT FOLLOWS, PB WILL REFER TO LEAD SOLDER, AND PBF WILL REFER TO LEAD-FREE SOLDER. THE LEAD-FREE SOLDER USED IN OUR MANUFACTURING PROCESS AND DISCUSSED HERE IS (SN+AG+CU). THAT IS TIN (SN), SILVER (AG), AND COPPER (CU), ALTHOUGH OTHER TYPES ARE AVAILABLE. This model is manufactured using Pb-free solder for the sake of environmental conservation. For service and repair work, we suggest using Pb-free solder as well, although Pb solder may be used. PCBs manufactured using Pb-free solder have the sign stamped on the PCB. CAUTIONS: • Pb-free solder has a higher melting point than Pb solder. Typically the melting point is 50–70ºF (30–40°C) higher. Use a high temperature soldering iron. Adjust your solder tool so that a temperature around 360–380ºC is reached and stabilized at the solder joint. Heating time of the solder joint should not exceed 4 seconds. Avoid temperatures above 400ºC; wear-out of tips will rise drastically and flux-fluid will be destroyed. • Pb-free solder will tend to splash when heated too high (about 1,100ºF or 600ºC). • Mix of Pb-free solder Tin (SN)/parts with leaded soldering Tin (SN) in/parts is possible but not recommended. If you have to use Pb solder, completely remove all of the Pb-free solder on the pins or solder area before applying Pb solder. If this is not practical, be sure to heat the Pb-free solder until it melts, before applying Pb solder. • After applying Pb-free solder to double-layered boards, check the component side for excess solder that may flow onto the opposite side (see the following illustration). Downloaded from www.Manualslib.com manuals search engine

4 HP High-Definition LCD TV Service Manual • Special information for Pb-free BGA-ICs: These ICs will be delivered in so-called dry-packaging to protect the IC against moisture and with the Pb-free logo on it. This packaging may only be opened shortly before it is used (soldered). Otherwise the body of the IC gets wet inside, and during the heating time the structure of the IC will be destroyed from steam pressure. If the packaging was opened before usage the IC has to be heated up for about 90 hours to dry. Make sure you use ESD protection! Suggested Pb-Free Solder Several kinds of Pb-free solder (some shown in the following illustration) are available for purchase. This product uses Sn+Ag+Cu (tin (SN), silver (AG), copper (CU)) solder. However, Sn+Cu (tin (SN), copper (Cu)), Sn+Zn+Bi (tin (SN), zinc (Zn), bismuth (Bi)) solder can also be used. Servicing of Surface-Mounted Devices (SMDs) CAUTIONS: General cautions on handling and storage: • Oxidation on the terminals of SMDs results in poor soldering. Do not handle SMDs with bare hands. • Avoid using storage places that are sensitive to oxidation, such as places with sulphur or chlorine gas, direct sunlight, high temperatures, or a high degree of humidity. The capacitance or resistance value of the SMDs may be affected by these conditions. • Rough handling of circuit boards containing SMDs may cause damage to the components as well as the circuit boards. Circuit boards containing SMDs should never be bent or flexed. Different circuit board materials expand and contract at different rates when heated or cooled and the components and/or solder connections may be damaged due to the stress. • Never rub or scrape chip components as this may cause the value of the component to change. Similarly, do not slide the circuit board across any surface. Removal of SMDs 1 Heat the solder (for 2 to 3 seconds) at each terminal of the chip. By means of soldier wick and a slight horizontal force, small components can be removed with the soldering iron. They can also be removed with a solder sucker (A). 2 While holding the SMD with a pair of tweezers, take it off gently using the soldering iron’s heat applied to each terminal (B). 3 Remove the excess solder on the solder lands by means of soldier wick or a solder sucker (C). CAUTIONS: • When handling the soldering iron, use suitable pressure and be careful. • When removing the chip, do not use undue force with the pair of tweezers. • The soldering iron to be used (approx. 30 W) should preferably be equipped with a thermal control (soldering temperature: 360º to 380º C). • Once removed, the chip cannot be reused. Downloaded from www.Manualslib.com manuals search engine

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HP LT3200 LT3700 LT4200 LT4700 Service Manual

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