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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Use following steps to reset channel, but I lost the sound 1. Unplug TV 2. Press Channel up and Volume up at same time, while plugging TV back in (two person job - it will pull up a service screen) 3....


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HI,

WHEN WORDS AND PICTURES ARE BLUR,DIFFICULT TO SEE,,

ITS PROBLEM WITH LOT (LIGHT OMITTING TRANSISTOR) WHICH INSIDE TV ...

NOT OTHER PROBLEM ..JUST GO TO ECONOMIC TV TECHNICIAN.

TNKS

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1 Answer

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1 Answer

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1 Answer

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