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Repair guides and support for Panasonic's Viera line of televisions.

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Why Panasonic TV turns on then off?

I’m Japanese student ,so my sentences may be difficult to understand.If you think so, please tell me.I’ll try to develop.

I had a problem with my Panasonic TV, VIERA TH-26LX80-S. My uncle gave it to me a few days ago because it has broken and she bought a new one. She's had it for a few years.

Now, The TV doesn’t work well.It turns on and “No signal“ is displayed on the screen ,but the screen is not bright enough and hard to watch. Then the TV turns off.

I thought the problem was caused by its led-backlight and I dismantled it.

The led-backlight looks like it does not broken. However, when I turn on the TV , the both sides of it are bright but the middle of it isn’t bright. It is bright perfectly with strange sound like hum noise sound once every ten times. “H8A6 G“ was written on the edge of it..

How can I fix or replace it for a new one?

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Update (09/30/2018)

Thank you for you help.

I looked for bulging electrolytic capacitor and ferrite transformers, and I probably found them.

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but i could not figure out where is broken.

Please tell me what to do to know where is broken.

Risposto! Visualizza la risposta Anch'io ho questo problema

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@easternegg you identified it absolutely right. Those capacitors are bulging. You do want to go ahead and replace those. Yes, the two rectangular components are transformers.

da

Thanks very much !!

I'll replace those capacitors as soon as possible.

da

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Soluzione Prescelta

It looks like the backlight isn’t LED but CCFL (cold cathode fluorescent),. These need a high voltage to operate, generated by an inverter. My guess is that there’s a fault in the inverter with the result that it isn’t supplying a high enough voltage. You will probably find that the backlight is supplied by a board containing several ferrite transformers. Look for any signs of overheating, or of bulging electrolytic capacitors in the same area.

(Congratulations on your commendable English, by the way!)

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3 Commenti:

Thank you for your help!!

I could find a cause.

da

According to the board markings, those caps are 680uF 35V. You need 680uF, but to prevent it failing again, go for the next higher voltage (probably 50V or 63V). Also, when you get them out you'll find they have a temperature rating. Go for the next higher rating you can find.

And don't forget, it's very important to fit the replacements the correct way round. The board is marked + and -, and one side of the cap will be marked -.

da

Thank you very much.

I decided to buy 50V 680UF capacitor on AliExpress.

When they arrive, I'll replace them in the correct way.

da

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