LG flatron M1740A - Page 20

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4. NO SOUND
NO SOUND
NO
NO
Check Speaker Condition
PC Mode
1.Check J103 Peripheral
Circuit
2. Check U803 #5,
Voltage Must over 8V
AV1 Mode
1.Check Scart
Connection
2.Check No Raster AV1
AV2 Mode
1.Check C605, C606
2.If No Signal on C605 or
C606, Change Video
Board
YES
Check a Signal of
C153~156
Check the Cable of
Main to Key
NO
Check the Cable of
Key to Speaker
<< CHECK INPUT SIGNAL>>
CHECK THE PERIPHERAL
ICOf U201
Change the Cable
Change the Cable
YES
YES