22
TROUBLESHOOTING
When RF screen doesnÕt come out.
Is there video output signal
NO
Check the IIC communication.
Is there video input signal
on 28 pin of IC109?
NO
Check the C396,R196,C123
YES
Is there video output signal.
NO
Check the Power of IC109
(2,4 pin :12V)
YES
Is there video input signal on 10
pin of IC304?
NO
Check the R196,C396.
Confirm video part.
YES
YES
5. Repairing the RF Trouble
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 ...