Question about Projection Televisions

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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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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.

Sep 01, 2012 | Philips 60PP9352 60" Rear Projection...

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.

Thank you,
Shuttle83

Oct 29, 2007 | InFocus ScreenPlay 61" Rear Projection...

1 Answer

Black Screen


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 :)

Jun 26, 2007 | Hitachi UltraVision CineForm 55VG825 55"...

2 Answers

52" RCA big screen tv turns on and few seconds turns off by itsel


if you heard a hissing or like static sound your board probably has a hole in it now. the board on the left side with the flyback fransformer. the hole is from where a prong has come loose an is arking over an it burns the board the ark is the sound you heard.

Apr 23, 2009 | RCA R52WM24 52" HDTV Projection Television

1 Answer

SONY GRAND WEGA KF-50WE610 can't turn on TV screen.


Ths 5 blinks usually indicate an AKB problem. There is a break in the video path. I'll look up your specific model and post the results here. Please update this if you wish to attempt the repair yourself.

Thanks,
Dan

Mar 19, 2009 | Sony Grand WEGA KDF-55WF655 36" Rear...

1 Answer

Sony 46" lcd turns off by itself and will not power up again.


Sony TVs come with a one year warranty on parts and labor. Call Sony at 1-800-222-SONY They will find a local company to service this product.

These TVs have a self-diagnostic screen that a tech can access to help solve the problem. Your problem could be any number of things including the fan(s) stopping, the ballast board failing, Q-box issue or none of the above.

michtech

Feb 19, 2009 | Sony Projection Televisions

1 Answer

Power Problem (Phillips 55P8341 Projection TV)


Same problem... I pulled out the second electronic board going from right to left and see a burned diode at position 3307. I wanted to know if anyone has a schematic of this TV and could tell me the numeric value of the part in position 3307. It would be appreciated it you could let me know.Thanks...

May 30, 2008 | Philips 55P8341 55" Rear Projection...

1 Answer

Screen turns off and on continuously


check the solder on the vertical output ic. it may need to be resoldered

May 11, 2008 | Sony KP-48S65 48" Rear Projection...

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