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pollytintop
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Has picture but no sound.

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This tv is giving me a profound headache..story was: picture no sound. Ordered replacement board (the board to which the speakers connected to)(repeat several times) all had other faults but no sound restored! Decided to fix original board..found 2 blown caps. Still no sound. Up until today I was convinced that the problem must be on the board because other boards gave different problems. Have searched all over board and can find no other faults so bought this final board..still no sound! I initially checked the 2 speakers for continuity and moved on. I know nothing about tv's or speakers apart from what I'm learning as I go. I think the speakers must be the problem but no idea really how to test them/repair them.. the volume bar on the display moves up etc, have been through all the settings/menu-no help at all. Any ideas??

Edited by: oldturkey03 ( )

Archived as not answerable by oldturkey03

Can you hard wire the internal speakers to any other external playing device like a radio? Can you make the TV play a tone and test the potential and/or current going through the speaker wires to see if power is getting that far?

Phillip Takahashi,

I've been racking my brains over what I could rig these speakers to...have dug out an old transistor radio. How easy do speakers stop working???

pollytintop,

pollytintop, try it the other way around. Use an old speaker, yes even the one from your transistor radio would work. Connect it to your TV via a set of alligator clamps. That way you can check if your board supplies each channel.

oldturkey03,

clever man! never thought of that..truly am a little deficient in the thinking department lately.

pollytintop,

That would only diagnose his board. I was thinking of trying to see if the speakers are dead for some reason. I honestly cant think of any reason the speakers would be dead if they passed a continuity test...but you never know!

Phillip Takahashi,

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Fred
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Quick check of speakers: disconnect from board output and momentarily connect a 1.5 volt battery. You should hear a "pop" when connecting and disconnecting, if the speaker is good. Speakers unlikely, however. Two at once indicate blowing the speaker coil due to power overload, which also is unlikely from a TV audio amp.

Each speaker is connected to an independent stereo output from a dual channel amp, yet each side has the same problem. Blown caps indicate a power problem. Multiple board replacement without problem resolution indicate a problem external to the board.

If it's the power supply, it's an output providing voltage just to the audio circuits. You probably need to troubleshoot -- replacing all components multiple times can get expensive.

Archived as not answerable by oldturkey03

no pops. so no power to the speakers. looked all over the input board, all caps/chips/thingo's and wotsits etc are working. Can only suspect the cable connecting the 2 is the problem. tried wriggling the wires into the connection better..still no sound. I just don't know whether I can actually be bothered to investigate that any more. And that is because it's a freebie, I'm not going to enjoy my hard work solving the problem by watching at the darn thing. Tomorrow is another day..

pollytintop,

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