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Tv will not turn on completly, it powers up then just before ths screen comes on it turns itself off. it then continues to switch itself on and off.i have a samsung 42" lcd digital tv.

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Seen that problem several times. In most cases it was the main pcb part number BN94-00850A. But that is only a good number for a certain model. I have to agree, on this one if you want more than a guess, take it to a Samsung servicer, or throw it away. Most non-factory shops don't have access to spare parts for testing purposes, until someone tries a self-repair job. Good luck, Russmann.

Posted on Nov 05, 2008

Bad capcitors in th switched power supply

Posted on Nov 05, 2008

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I think the problem is not easy to solve,otherwise i suggest bring it to a qualified TV technician,the regulator from your power supply wer'e damage,pls check it...

Posted on Nov 05, 2008

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1 Answer

Monitor goes off and on by itself


Hello bjaykaye,

The problems you are having are an indication of a Power Supply problem. The issue could be in the switching power supply or the High Voltage Power Supply. The shutdown circuit is activating which is allowing the TV to play until it detects an over-current event. When an over-current event happens the shutdown circuit will turn the TV off. I would suggest that you check the Horizontal Output Transistor, the HV Transformer, the Horizontal damper diode, and the capacitors that are in parallel to the damper diode. The important thing is to find the component that is causing the problem. If you do not have a background in electronics I would suggest that you get a qualified electronics technician to look at the set.

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1 Answer

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It sounds as if the lamp has failed possibly due to a failed cooling fan (the fan should be the first thing to come on). here are the links to the user manual if you need it; http://merchant.satisfusion.com/sf/library/manuals/owners/50_55_60VG825.pdf and http://merchant.satisfusion.com/sf/library/manuals/owners/50_55_60VG825_Part2.pdf It may be worth trying to uninstall and reinstall the lamp, but usually these fail internally rather than having bad connections etc. It is often obvious when the lamp has gone from a visual inspection. If the lamp has failed, when you replace it, make sure the fan comes on - if not then turn off instantly and investigate further. One other possibility before buying a new lamp, is that the lamp compartment cover may not be properly fitted. This will interrupt the power, so I am assuming there is a microswitch or similar that the cover or the screws that hold it should contact. Possibility is that the cover is badly fitted, or a small piece of the cover has broken, which would normally contact the switch, or the switch is faulty - if you can see the switch then a continuity meter will easily test the switch. Also check that the lamp unit securing screws are properly tightened, they also may stop the TV powering on. Please ask again if you need more help with this, if you are unsure then a photo of the inside of the lamp compartment and the lamp itself may help :)

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1 Answer

My tv, when plugged in just keeps turning itself on and off in intervals of about 3 seconds. It doesn't give time for anything to come up on the screen at all.


Problem is in standby power supply or microprocessor area---not the do it yourself repair and likely not economical to repair due to age and brand of set.

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1 Answer

Over tv its getting aoutmatically off


Hello

Put your hand on the back of your TV to check for overheating, if your set keeps switching itself off without warning.

Many TV sets come equipped with a safety feature that switches the power off if the set gets too warm.

Check the cooling vents located at the rear of your unit. Vents can collect dust and dirt, resulting in the fans becoming blocked and failing to work properly.

Remove dirt from the vents with a damp, clean cloth. Ensure the air conditioning is kept at adequate levels in the room where your TV is located. Keep the drapes shut on hot, sunny days to keep the room cooler.

Check the sleep-timer function on your TV if it keeps turning off. A sleep-timer is used to turn a television set off after a certain period of time has elapsed. If the sleep-timer is not turned off, your television will continue to turn itself off after a certain period of time.

If the problem persists,then a heat sink has gone bad.

The on/off button simply toggles a low voltage circuit that powers your tv. If it is dusty, it may complete the electrical circuit and send a false signal.

Take a can of compressed air, open the back and clean the dust off the circuit boards.

NOTE;opening the TV VOIDS warranty!!

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1 Answer

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Comcast box was resetting at the exact same time and I found this online....

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1 Answer

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2 Answers

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I have a complete set working all panels with a duff pdp panel - i will happliy sell you the boards please call me on 07940 025730 for details cheers.

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