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42" Plasma TV

 
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Shen
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PostPosted: Fri Jan 08, 2010 9:40 pm    Post subject: 42" Plasma TV Reply with quote

I have an old plasma 42" TV. It only works for about 2 hours; it losses color first and then completely blackout.

After a few of days, it works again.

Its power supply board USP490M-42LP was replaced, together with remote control board, 2 years ago.

I thought that it must be a chargeable component causing the trouble. Anybody has the similar experiences and could knidly help me to identify the component?

js
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PostPosted: Sat Jan 09, 2010 12:32 am    Post subject: WRATH Reply with quote

A model number would help.
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train123



Joined: 26 Jan 2010
Posts: 88
Location: Canada

PostPosted: Tue Jan 26, 2010 7:16 pm    Post subject: Reply with quote

You could first check to see if it is related to Heat / Cold. If the set always comes back to normal after it has cooled off, that might be your problem. Go to your local electronic repair shop and buy a can of "Cold Spray" or use a can of compressed air in the upside down position. Run the set until the picture is just starting to go, then spray a few components at a time (to cool it off) while watching the picture. When the picture returns to normal, you've found the bad part
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Shen
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PostPosted: Wed Feb 03, 2010 9:38 am    Post subject: TCL 42" Plasma TV Reply with quote

Sorry I had been away. Thanks for all the replies.

The model is TCL PDP42U3H.

I doubt it is Heat/Cold problem because sometime it took more than a week for the TV to work again. The TV should be completely cold after a day.

To take so long for a component to work again, it seems to me that it is a slow discharging component.

js Sad
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train123



Joined: 26 Jan 2010
Posts: 88
Location: Canada

PostPosted: Wed Feb 03, 2010 9:18 pm    Post subject: Reply with quote

Then it is more likely a cracked solder connection on the power supply board. Inspect the solder using high magnification and look for hairline cracks.
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