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I have the 42" LE42S704. A couple of weeks ago I got a no signal

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I have the 42" LE42S704. A couple of weeks ago I got a no signal message on the screen, I had the sat. reciever hooked to #4 HDMI port. I had a Direct TV tech. look at the television, he thought it might be the televsion that was bad (we also checked all 3 dmi ports-no luck), he installed the component cables (5-jacks) from the sat. reciever to the television and it worked. A few days after installing the comp. cables I had been watching TV for about 4 hrs. when I got another no signal message, I shut the TV off for a few hrs. and I am not sure if letting it cool down helped but it would come back on but now it is working less time between signal shut down. I tried new hdmi cables, resetting the reciever, etc, no help. Any help is appreciated, thanks.

Submitted: 11 months ago.
Category: TV
Picture
Expert:  bluextc89 replied 11 months ago.

Thanks for stopping by:

The issue you are experiencing is likely a failed AV board processor or cold solder joints. It seems after heating - the thermal expansion causes the tabs to break contact.

I recommend replacing the main AV board.

However, this is a fairly new set that should still be under warranty?

If yes - contact Hitachi to set up warranty service.
1-800-HITACHI

Im not showing a great availability of the mainboard at any of my usual suppliers.

If you have additional - Just Ask.

Thanks!

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Customer: replied 11 months ago.

Great!


How do I go about obtaining an AV board? I am an aviation tech. with some soldering experience, and understand esd safety. Is this something I can tackle?


Thanks

Picture
Expert:  bluextc89 replied 11 months ago.

LCD tvs are the easiest sets to work on - and yes.... if you own a phillips screwdriver - it is nothing to disassemble the TV and replace the board.

My parts list says the LE42S704 takes a 756TQABZK03703 mainboard.

Double-check yours to be sure it is the same before ordering a replacement.

Shopjimmy.com is a good source of used boards. They are a scavenging company (primarily). They disassemble sets and sell the working parts. But the set is too new to have any parts registered as of yet.

PAC parts sells a new board (with $20 core charge) - CLICK HERE to see. You have to scroll down to the 6th item down.

If you have additional - or need excerpts from the service manual for anything - Just Ask. (even after rating).

Thanks!

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Customer: replied 11 months ago.

bluextc89


Thanks for your help, your tech. help and response time was excellent. All you answers made sense. If I have anymore questions I will look you up.


Thanks Again


Mike Serrano

Expert:  bluextc89 replied 11 months ago.

No problem - please don't forget to rate the service.

bluextc89, Technician
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Positive Feedback: 95.1 %
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Experience: Small Business Owner.
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