LG RH265 Service Manual page 18

ELECTRICAL TROUBLESHOOTING GUIDE
No 5VT
YES
Is the VCC (5.3V)
supplied to Q155 Emiter?
YES
Is there
about 0V at D152 and
Q152 Collector?
YES
Is there
about 5V at R180 and 0.7V at
Q152 Base?
YES
Check Q152 and Replace
No 33VT
YES
Is the VCC (33V)
supplied to Q161 Emiter?
YES
Is there about 0V at
Q152 Collector?
YES
Is there
about 5V at R180 and 0.7V at
Q152 Base?
YES
Check Q152 and Replace
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Only for training and service purposes
NO
Check 5.3VA on SMPS Board
NO
Check Q155 and Replace
NO
Check the "TIMER H"
signal from µ-COM
NO
Check D128 on SMPS
Board and Replace
NO
Check Q161 and Replace
NO
Check the "TIMER H"
signal from µ-COM
3-5 LGE Internal Use Only