Samsung SGH-X640 Service Manual page 39
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Also See for SGH-X640:
- User manual (87 pages) ,
- Service manual (46 pages) ,
- Manual (107 pages)
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Flow Chart of Troubleshooting
10. Key Back Light
Key Backlight does not work
Yes
No
Check the PMU related to "VDD_KEY"
U701 pin 5 = "H"?
Yes
No
Resolder or replace U701
U701 pin 2,3 = "H"?
Yes
END
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