8. Level 3 Repair
8-1
8-1. Block Diagram
Level 3 Repair
8-2
8-2. PCB Diagrams
8-2-1. Top
Level 3 Repair
8-3
8-2-2. Bottom
Level 3 Repair
8-4
8-3. Flow Chart of Troubleshooting
Equipments
Oscilloscope Digital Multi-meter
Power Supply + driver, ESD Safe Tweezer
8960 & Spectrum Analyzer Soldering iron
Level 3 Repair
8-5
8-3-1. Power On
Mobile phone does not power on.
Check the TAC1000
(soldering crack, open, etc)
Change the TAC1000(Power-key switch)
And retry to the power-on operation.
END
No
Yes
Check the U600 output voltage
(C665 > 1V,C664 > 1V)
If the output voltage is not satisfied with normal
condition, Change the U600.
※ Each voltage level has ±10% margin.
No
Yes
Yes
Check the Battery Voltage.
Is it more than 3.8V?
Charging the battery by TA.
If its voltage level is extremely low(under 3.0V),
Change the battery.
check the initial operation
Abnormal
Check the Clock OSC5000
Is that frequency 24Mhz?
Change the OSC5000.
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
No
Yes
Yes
Change the FRONT-LCD ASSY
Power-on the phone and
check the power-on sound
or motor Vibration.
Sound or Vibration is ok?
Yes
No
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Samsung Galaxy S4 Service Manual
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Description
The manual is available for the following phone variants: I9500, SGH-I337, SGH-M919, SCH-I545, SPH-L720, SCH-R970.
The guide includes the following sections:
- Disassembly and Assembly Instructions
- Electrical Components Lists
- Exploded view and parts list
- Firmware Installation
- Detailed Schematics
