FLY SP-770, Как в инструкции

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SECTION6. EQUIPMENT REPARE PROCEDURE
1. No Power On with Battery Applied
A.
Power check
1. Check Battery voltage: 3.4 ~ 4.2V
2. Check to see if ZD670 cathode voltage is 3.4 ~ 4.2V
3. Check to see if C905 voltage is 2.8V
4. Check to see if Y930 clock is 32.768khz
5. Check to see if U950 works properly
6. Check to see if R824 voltage is 2.8v
7. Check to see if C809 voltage is 2.8v
2. LCD display and backlight error
A. LCD display error
1. Check to see if LCD control signal and data signal are correct
at the B to B connector (J631)
2. Check to see if B to B FPCB state is alright
3. Check to see if FPCB connecter contact is alright with J631
4. Check LCD Module state and Replace the LCD Module
B. Backlight error
1. Check the NO.1 pin signal at U510 high.
2. Check to see if L510 voltage is 3.4 ~ 4.2V
3. Replace LCD module
3. Key pushing error and LED not in operation
A. Key pushing error and LED not in operation at LCD Module
1. Check J631 connector contact is correct.
2. Check to see if the MP3/CAM dome sheet contact is correct
3. Check to see if R524 voltage is 2.8V
4. Check to see if R660/R661 voltage is 3.4V~4.2V
B. Main-Key pushing error and LED not in operation
1. Check J630 connector contact is correct.
2. Check to see if the MAIN-KEY dome sheet contact is correct
3. Check to see if the 18 pin at J630 voltage is 3.3v