Hi.
If there is sound but no picture it means that the three CRT picture tubes are not receiving power.
The first part to test is the power supply (PSU). The PSU supplies power in different DC voltage to the different circuits of the TV. The higher DC voltage line goes to flyback and then to CRT. Testing is done reading the VDC line to flyback.
Here the part:
Power V20/V20BIf the PSU is OK the flyback transformer is usually responsible. This part is tested reading voltage in (if it is OK part is usually bad) and testing solder joints and components. Here the part:
Transformer -FbThe contacts and solder joint in the individual CRT housing must also be tested checking if there is continuity between contacts with CRT and solder joints on the other side. It is unlikely that three CRT housing go bad at the same time. This test in more of a routine check.
If the parts mentioned above are OK the problem is the digital controller board.
Try first disconnecting power for five minutes. If that does not help the TV must be disassembled to test parts mentioned above and to replace faulty part.
Here all parts for your TV.Regards.
Ginko
