LG SH52TH-C Service Manual page 30

3. TEST & DEBUG FLOW
TEST
Check the
AC Vol tage
Power PCBA (110V
or 220V)
Yes
Switch on the Power PCBA
Is the
DC Voltage outputs
OK? (-35V, -30V, -33V, ±12V,
3.5V, 5.6V, 5V, ±12V, 5.6V,
3.3V, 5V, 7V,
32.5V)
Yes
Are 3.3V and 5V DC
outputs normal on main
PCBA?
Yes
Update
FLASH
successfully?
Yes
A
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Only for training and service purposes
No
Check the POWER PART
No
Check the POWER PART
No
Check the regulators or diode.
1. Check 27MHz system clock.
2. Check systemreset circuit.
No
3. Check FLASH R/Wenable signal PRD,
RWR.
4. Check FLASH Memory related circuit.
Replace FLASH
3-3 LGE Internal Use Only