Question about Hitachi 61SWX10B 61" Rear Projection Television

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No audio - replacing surround pwb every 2 years

I've just ordered my 4th surround pwb in 8 years. Does anyone know what is failing on this board? I'm capable of repairing the board myself but don't have much troubleshooting equipment anymore. I inspected it under a magnifying lens and did not see any heat-related damage, leaking caps, etc. I also sprayed cool-down on the ICs and board in general, and flexed the board while in operation - no change in symptoms.

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  • Dick Berry Jan 26, 2009

    I have the full service manual including schematics. I may try to inject some audio on the input and trace it until it fails to come out, depending on how complicated the power supply and supporting signal connections are. The mouting position in the TV makes it too difficult to do in-place. It will need to be on the bench for me to tackle it.



    As for heat, it seems to fail only after warm-up, that's why I tried cool-down spray. I can wait for it to fail then hit it with cool-down - but no change.



    If I find a solution I'll post it here. It seems many people with Hitachi TVs are experiencing this problem, and the supply of rebuilt boards is drying up. I found one at Sears after trying several parts suppliers found via Google. Most of them want me to send the board in.



    Thanks for your comments.

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Hello dickberr,

From what you have said it is not a thermal problem (hot or cold sensitivity) By the way did you try to test it with heat? a hair drying gun works great, not a circuit integrity problem (solder joints and cracks). That leaves component failure as the possible cause. What you could do is to get a known good board and and use it as a comparison to a know bad board, using a huntron tracker (can be gotten on ebay) or taking voltage measurements and comparing them them to the known good board and vice verse. This will at least give you an idea of which component might be malfunctioning. As you know you will need a schematic, and a voltmeter for the test of the voltage levels.

I believe that the problem is in the output stage after the board in question, something is causing the board to overdrive and this might be destoring the board. Try the heat test and take measurements to check the voltage levels on the good and bad boards.

I hope this helps,

Thank you,

Shuttle83,

http://www.electron-age-technologies-llc.com

Posted on Jan 26, 2009

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