Question about Pioneer SD-P50A5-K 50" Rear Projection Television

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TV shuts off seconds after being turned on

My Pioneer SD-P50A5-K 50 Projection TV has started shutting itself off almost immediately after its turned on. It's fairly old TV, but I'm not sure if it's totallt broken, or if I've missed something and can fix it. Is there anything that can cause this problem, and is there a solution ? I'd be willing to pay for repairs, but how much would that likely be given the problem ? Thanks for any help on this.

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Re: TV shuts off seconds after being turned on

This is actually a common problem with this unit and one that Pioneer is aware of... Over time the feed resistors in the convergence circuit change in value and the convergence ICs begin to fail, placing more of a load on the power supply than necessary and stressing components in the SMPS. The fix; Pioneer recommends upgrading the convergence IC's from STK392-110 to STK392-180, change all resistors in the convergence circuit that have changed in value and replace the power supply to repair the unit.

Posted on Jun 27, 2007

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Re: TV shuts off seconds after being turned on

You may need the power supply board resoldered as I had the same problem. The guy listed below can do it for you as I shipped mine from Illinois to him in California... Piece of cake getting the board out of the back and it's not too fraigile... Just pack in bubble wrap and it will be fine. My TV is now working great.


Good luck.


Posted on Jan 16, 2008

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Have a 55" pioneer rear projection tv, was working great, turned it off and when turning back on it comes on for a split second and it shuts off

Take the back of of your set. You should see if there are leds on the circuit boards that light up when you try to turn on set. Use these for reference.
If only D146 on the power supply lights up then the problem is the power boar.
If D1503 lights up then the problem is the audio circuit on the amp board.
If D2614 then the shut down is due to lack of vertical deflection. It could be caused by a defective amp assy or convergence control assy. Checj for convergence drive signal at CN2302 pin 1. If missing, IC2308 on convergence control assy is probably defective. You can confirm by checking blanking signal input on pin 1 of IC2308.
Good luck to you.

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