LG HT356SD Service Manual page 14

5. Test & debug flow
TEST.
Check the
AC voltage Power PCBA (110V
or 220V).
Switch on the Power PCBA.
Are the
DC Voltage outputs OK? (12V,
3.3V, 5V, 7V, 34V).
Are 3.3V and
5V DC outputs normal on main
PCBA?
Update
FLASH successfully?
A
YES
YES
YES
YES
YES
YES
NO
Check the POWER PART.
NO
Check the POWER PART.
NO
Check the regulators or diode.
1. Check 27MHz system clock.
2. Check system reset circuit.
NO
3. Check FLASH R/W enable signal PRD,
RWR.
4. Check FLASH Memory related circuit.
2-5
NO
Replace FLASH.