LG RH-2320 Service Manual page 19

No SW_5.3VA
YES
Is the Vcc (5.3V)
supplied to Q158 emiter?
YES
Is there about 0V
at R179 and R156?
YES
Check Q158 and replace
No SW_FD(+)
YES
Is the Vcc (FD+) supplied
to Q163 collector?
YES
Is there about 5.3V at
R184 and Q153 collector?
YES
Is the VCC (5.3V)
supplied to Q153 emiter?
YES
Is there about 0V
at Q153 base?
YES
Check Q153 and replace
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Only for training and service purposes
NO
Check 5.3VA on SMPS board
NO Check the "STANBY H"
signal from µ-COM
NO Check D121 on SMPS
board and replace
NO
Check Q163 and replace
NO
Check 5.3VA on SMPS board
NO Check the "STANBY H"
signal from µ-COM
3-7 LGE Internal Use Only