Vcr Main - LG RCT689H Service Manual

VCR ELECTRICAL TROUBLESHOOTING GUIDE

VCR MAIN

No 5.0V
Is the
Vcc(5.3V) supplied to Q801
collector?
Is the Q801 Base "H"?
Check or Replace the Q801
No REG 12V
Is the
Vcc(13V) supplied to Q802
collector?
Is the Q802 Base "H"?
Check or Replace the Q802
No 33V
Is the
Vcc(34V) supplied to Q803
Emitter?
Is the Q804 Base "L"?
Check or Replace the Q804
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check or Replace the D123
Check the 33V Line or ZD815
Check or Replace the D122
Check the 33V Line or ZD816
Check or Replace the D126
Check the PWR CTL
"H" signal from IO u-COM(IC601 #29)
3-5