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

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Main power light turns on but i have no picture or sound

I have a 50" Pioneer TV model sd-p50a5-k. When i turn the power on the red light on the front panel turns on and i hear a click in the back of the TV. I took off the back panel and i can see a red LED that is lit up, but i don't get picture or sound. I tried using a voltage tester to test the power supply board (part number AWV1622) and I tried to find a bad fuse or maybe bad saudering, all the fuses seem fine and so far no bad saudering. I did find that everything on the "primary power" part of the power supply board is getting power and appears to be woking fine. Nothing on the "secondary power" part of the board is getting any power at all. I am not sure what supplies the power to the secondary or if there is a part that cannects the primary to the secondary that could be faulty. Any help that can be offered would be greatly appreciated.

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  • kmac4 Feb 04, 2009

    I have the same exact issue. When the tv is tunred on you hear a click like it wants to power up, but then goes straight to standby mode.

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Take a closer look at the power board fuses. There is a fuse numbered 106 a little ways away from the rest of them. I have this same model and got it working long enough to diagnose a bad flyback transformer by replacing this fuse with one from Radio Shack. At some times, I could put in a new fuse and have the set work for a few weeks. The flyback transformer is available from parts.pioneerelectronics.com for around $60.

Posted on Mar 20, 2009

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