Question about Sony FD Trinitron WEGA KV-34HS420 34" TV
This tv had earphones plugged into the earphone jack in the front of the set. Now they have been removed, the tv has no sound. When I push the volume hi/lo selector on the front of the tv, it changes the channel. Would the sound have had to been turned off in order for the earphones to work?
You may have a bad H board which is the board that has the voulme/channel buttons on it. You may want to have a Sony asc give you an estimate to repair. Good Luck
Posted on Jan 23, 2008
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In most cases the standby light might blink with different rapidity to indicate a fault relevant to the processor. It is possible that most of these indicate that there are errors in the processing section . Since there is a possible short or leak in the circuit the output driver section can take in huge current to trip the SMPS or from advice from the micro processor. Remove the power plugs and make sure that high voltage sections are discharged of the potential stored in capacitors. Look for visible signs of leak or of busted capacitors. Look for bulged capacitors or damaged components- burnt or busted. Use a multimeter to check the continuity or shorting in components, if so detach from circuit and test . If the voltage builds up and the set power ON and then shuts up then the suspected section must be checked in detail.
The processor must have the +5 voltage to the function properly , the +B and secondary voltages also must be checked to infer the fault. Trace with caution and in running through the signal path , circuit trail.
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