Troubleshooting - Daewoo DV6T834N Service Manual

TROUBLESHOOTING

1. POWER CIRCUIT
CAUTION
You must use insulated transformer during the first part test of POWER circuit.
No power
POWER cord is ok?
YES
Is 200V~140V voltage
obtained at C804 +?
YES
Output voltage of 2
parts is normal?
YES
rectifier diode of 2
D821, D822, D823, D826,
D827, D828, D830
YES
pulse of Q801 collector is
YES
NO
NO
NO
nd
Check
NO
nd
parts ;
NO
Switching
normal?
OK
Exchange POWER CORD
Check F801.
Check IC601,IC751.
nd
Exchange rectifier diode of 2
parts ; D821, D822, D823, D826,
D827, D828, D830.
Check Q801.
5