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Sharp model LC-20B6U-S now has no sound or picture. While watching TV yesterday everthing went out. Screem appears to come on but no picture or sound.

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By this description it sounds like you have backlight to the picture which means the power supply in the set is working and the inverter board which powers the screen is working. Your problem may be on the main board if this is the case. I have repaired this set for the same symptom with two different problems. First it could be on the inverter board, and second it could be on the main pcb. Once on this model a piece of metal heatsink slid down due to operating temp. of set and touched bottom of main pcb causing a failure of the sound and picture. Either way, if you have no on-screen-display you will be replacing a circuit board. If you whine loud enough to the mfg. co. they may help you. But good luck.

Posted on Jun 02, 2008

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Posted on Jan 02, 2017

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sounds like the main board maybe going out or is gone and the lamp may have went as well

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As a Texan's and Lion's FAN I'm not sure if I should give you any advice. First of all GO 9er's!!!! I love you too. Try this since I don't know what "box" you may have. See if "box" remote has a "display" button on it. If so, press. Also, try resetting BOX by unplugging for 2 to 5 minutes. IF NO FIX call service provider, TV is not the problem. Good Luck, big IRISH.

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there is a possibility that you have switched the RCA cables for the right port, the color patterns happen if your plug the component RCA ( Y Pb Pr) on a diff port. their usually color coded so please double check that to.

e733778.jpg if not, please let us know what is the model number of the TV and we will find what can be done in the TV.

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Sharp Aquos LC-20B6U-S TV NOW HAS NO SOUND OR PICTURE. IT APPEARS TO COME ON BUT WITH NO PICTURE OR SOUND.


This can be caused by many different things. Check power supply fuses. If ok suspect inverter board which drives screen. Check for bulging capacitors and open transformers or just find replacement cost using numbers on board. That may fixya.

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Gud day..you check first ur cable then ur speakers.. even the connectors and jacks...

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Hi.

Your problem is very lightly to be A faulty invertor pcb.
Relatively easy to replace but you may find it difficult to purchase.

The invertor pcb basically makes high voltage to strike up the tube lights behind the screen.

What make & model is your tv set & what country are you in.

http://dysonmanuals.llc.nu/

Chris..

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1 Answer

NO POWER TO TV


This sounds like a bad convergence board.
You didn't mention the model but I bet its a samsung rear projection HDTV.
If the convergence board fails, you can diagnose by pulling the power leads to the 3 convergence circuits, then power on the tv, if it lights (picture will have very bad convergence) then that is most likely the cause.
You can usually buy a new convergence board for about $80-$100. Look on eBay by the make and model of the TV.
And its real easy to replace.

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