24
TROUBLESHOOTING
When RF CHANEL TUNNING is not working.
Check the IIC communication
Is there 2~3 voltage on pin
19 of RF101?
NO
Check the power of RF101.
YES
Is there 2~3 voltage on pin 4 of
IC107?
NO
Check the C110,R181.
YES
Is there video input signal
on pin 1,8 of IC102?
NO
Check the
R132,C101,C123
and "When RF screenÓ
Is there video output signal
on pin 5,6 of IC102?
NO
Check the power of IC102.
(pin 7:5V)
YES
Is there video input signal
on pin 4 of IC104?
NO
Check the
C124,C125,R127
YES
Check the IC107.
YES
YES
Is there sync output signal
on pin 5 of IC104?
NO
Check the R134,R138,R189
and the power of IC104.
YES
Is there sync input signal
on pin 58 of IC107?
NO
Check the pattern from pin 5
YES
Содержание DHD-4000D
Страница 30: ...29 BLOCK DIAGRAM VIDEO BLOCK ...
Страница 32: ...31 BLOCK DIAGRAM TUNER BLOCK ...
Страница 40: ...39 SCHEMATIC DIAGRAM ...
Страница 44: ...43 SCHEMATIC DIAGRAM SCHEMATIC DIAGRAM ...
Страница 45: ...44 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ...
Страница 49: ......
Страница 66: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...