Question about Sharp 25R-S100 25" TV

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Shut off itself

Sharp. tv 25" model#25rs100s. 4 years old . first thing find vertical transistor #la7840. burn up . replace back same # la7840, tv come on but shut down . unplug& plug in back tv still shut off itself right way. regulator in power supply , horizontal transistor ok when i test, anyone could solve my problem please? thanks!

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Sounds like you might have an auto overvoltage shutdown circuit kicking in. The hivoltage goes to high and the monitoring circuit auto shuts down. More than likely trouble is in hivoltage circuitry. If you have a transformer that will allow you to bring up the set slowly without shutting down and you can look to see what's happening.

Posted on Mar 09, 2009

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Horizontal line on screen denotes the absensce of vertical sweep itself. Check the vertical output section circuit to LA7840. Check for any loose solder terminals. It will be best to measure the input voltage to that IC from the LOT secondary supply. Try by replace the IC. If these do not help you, measure the frequency from the main IC. It should be at 50Hz. If this frequency is not present, the main IC is faulty. If you wish to get some more details about the circuit, check this link. http://electronicshelponline.blogspot.com/ Pull up older posts there, either by its left side bar, or see it in Timslide option. Schematic diagrams, that show vertical IC LA7840 is given. You can compare it.

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This is a general answer based on error code--problem in vertical circuit then the first thing is to look for ANY signs of Glycol having leaked from one of the picture tubes onto that area of the board.

If you do not know how or what to look for let me know and I will explain.

Vertical circuit deflects picture from middle to top and middle to bottom of screen; if set detects that it shuts set off instantly to prevent a instant BURN MARK from happening on all three tubes this set uses--prevent permanent damage to the screens of the tubes.

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1 Answer

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The power supply is going bad and should be replaced but for the cost you will pay for the repair you can buy a new TV. Get the extended warranty, it will pay for itself.

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1 Answer

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There are a few things that can cause that. Pretty much the TV is shutting itself down because it recognizes and issue in one of a few circuits. If you're getting a flash and then it cuts off my first guess would be a vertical issue. May be best to take it in to a repair center and have them take a look at it. Shouldn't be any more than $20 for a diagnostic check on the unit.

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