LG ACC55T - 2. Test & debug flow

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2. Test & debug flow
TEST
Check the POWER PART
No
Yes
No
Yes
No
No
Yes
Yes
Check the POWER PART
Check the regulators or diode.
1. Check 27MHz system clock.
2. Check systemreset circuit.
3. Check FLASH R/Wenable signal PRD,
RWR.
4. Check FLASH Memory related circuit.
Check the
AC Vol tage
Power PCBA (110V
or 220V)
Switch on the Power PCBA
Is the
DC Voltage
outputs OK? (-44V, -22V,
-26.5V, ±12V, 5.6V, 3.3V,
5V, 7V, 8V)
Are 3.3V and 5V DC
outputs normal on main
PCBA?
Update
FLASH
successfully?
Replace FLASH
A