For problems which are potentially heat related like this one appears to be, you can try a few different troubleshooting techniques which may help you narrow down the problem to a specific component or circuit board at least.
When you first turn the set on, before the screen artifacts appear on their own, you can use a hair dryer to artificially heat up certain areas on the circuit boards to see if you can induce the faults to appear earlier than usual.
Once the set has warmed up and the faults become visible, use a can of compressed air cooling spray to cool down specific areas on the circuit boards to see if that makes the artifacts disappear temporarily.
By systematically heating or cooling the various components and circuit boards you may be able to isolate the general area which is generating the fault.
Do not forget to test the TCON board as well. It seems to be the most likely suspect, even if you did just swap it out for a new one. It would not be too unusual to get a wonky board which is DOA right out of the package. You must remember that most spare parts for LCD TVs that you order online are just salvaged out of other broken sets with "unrelated" problems.
Here is a link to a short interesting Youtube video showing the LCD TV parts harvesting process in action:
http://www.youtube.com/watch?v=uCNEEuVhAWk&feature=related
Here is also a link to another Expert's solution to an LCD TV problem which includes links to his excellent and informative set of LCD TV / MONITOR TROUBLESHOOTING GUIDES:
http://www.fixya.com/support/t10008425-when_turn_tv_picture_flicks_off
These guides will give you some idea of the various problems with LCD monitors and the associated repair procedures.
If you choose to rate BUDMRTN's troubleshooting tips by clicking on the YES THIS WAS HELPFUL icon on his solution page at the above link, then I thank you very much for your time and consideration.
Please comment back here to this page if you have any details to add, have any questions, have difficulty with the links, or just require further general assistance and I will respond as soon as I see it.
I hope that was helpful to you, good luck.
Joe.
If replacing the TCON board made absolutely no difference to the initial problem, then it's unlikely that the replacement TCON had the exact same problem as the original.
The fact that the 'artifacts' (as yet undescribed) are not there permanently suggest the problem is not in the LCD panel itself, so that much is good. However, the most likely source of the problem now seems to be the main board itself.
The capacitors on the power supply board are certainly succeptible to heat failure as well but they usually stay failed once they go. Unless you have another TV of the same model that you can swap parts with or somehow manage to isolate the source of the problem, you may be stuck with a repair by circuit board replacement scenario. That is why having a dedicated circuit board test bed or a spare working set lying around is troubleshooting gold. It saves a ton of time when you can at least isolate the problem to one board or cable.
That's a fairly expensive set, so it is probably worth it to get yourself a new main board and try it out. You may have to spend a bit more on parts, but when you do the work yourself the labour cost savings more than make up for that.
If you have trouble sourcing a main board let me know, but you seem to have that aspect covered.
Just be sure to check the part number that is printed right on your circuit board and confirm that they exactly match the one provided in the source listing. Also make sure that any part you order is labelled "TESTED WORKING" in the condition description. Any Ebay part with a condition description of "AS IS" is almost certainly faulty.
Joe.
Thank you very much. I hope that works out.
Feel free to comment back if you run into any problems.
Joe.
Here are a couple of links to some MAIN BOARDS for that model currently available online:
http://cgi.ebay.com/WESTINGHOUSE-LVM-42W...
http://www.shopjimmy.com/westinghouse-56...
As I stated earlier, be sure to check the part number that is printed right on your own circuit board and confirm that it exactly matches the one provided in the listing. Also make sure that any part you order is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is almost certainly faulty. That being said, the suppliers listed above are usually pretty reliable.
Joe.
That's why you have to be extra careful ordering parts online. Some TV's will have slightly different boards inside even though the overall model number is the same, and it will make a difference.
Here is a link to an available replacement for your exact board:
http://www.shopjimmy.com/tvs/westinghous...
Joe.
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Forgot to mention I did try cooling spray to no effect, but have not tried a hairdryer.
The tcon board that I purchased was brand new. Could it still be faulty? What about the main board?
Very Helpful
Thank you for your response.
If you know of a reliable source to get a main board please let me know.
THX Randy
Thanks for the reply.
My board part number is 5600110513 will part number 5600110538 work? THX Randy
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