10
TROUBLESHOOTING
1. POWER circuit
✓
Caution
You must use insulated trance during the first part test of POWER circuit.
No output voltage of Power Circuit
Check POWER CODE
(+)Voltage of C805
Switching Waveform on Drain of
Q801?
Output Voltage of D821,
D822,D823,D826?
Check other parts.
Replace POWER CORD
Check F801, L801, L802, D801, R802
Check D805,IC802,Q801
Check IC804, IC805, IC806
When Power is ON,
Pin 8 of P821 is +5 voltage?
BAD
GOOD
YES
YES
YES
NO
NO
NO
NO
Output Voltage on Pin
2 of IC804,IC805 & IC806?
YES
Replace bad parts
NO
**DVM Voltege Measure**
On 110 Voltage input, DC 80 ± 10 Voltage
On 220 Voltage input, DC 190 ± 20 Voltage
NO
Check ON/OFF Control
Summary of Contents for DHD-4000D
Page 30: ...29 BLOCK DIAGRAM VIDEO BLOCK ...
Page 32: ...31 BLOCK DIAGRAM TUNER BLOCK ...
Page 40: ...39 SCHEMATIC DIAGRAM ...
Page 44: ...43 SCHEMATIC DIAGRAM SCHEMATIC DIAGRAM ...
Page 45: ...44 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ...
Page 49: ......
Page 66: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...