I have a Sansui HDPDP4200. It will not turn on. I did notice a green flashing led inside the back. Any Suggestions? I am also in the market for a schematic for it but have not been able to locate one

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.

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Plasma TV's are notorious for power supply problems, its most likely failing capacitors in the power supply. If you can find a repair shop i would take it in, otherwise you might also be able to find a replacement power supply board online, but its a crapshoot to find a good one so its better to try and repair/rebuild the one you have. If all else fails its just time for a new TV. It sucks, i know, but i see so many 2-3 year old TV's failing its like a plague of the repair shop.

You can but it can leave burn-in images on the screen.

We are having the same problem with ours, the power won't turn on with remote or button on TV. Advice on here was leaking capacitator needs to be replaced. We haven't had it repaired yet but figured I would pass this along to you.

If you can provide the RCA remote model # I can be more specific (it should be located on the back or inside battery case.
Anyway depending on whether your remote uses 3 digit codes or 4 digit codes the Sansui TV code is usually 191 or 1191.

1. Press and hold the TV button on the remote. LED will stay "ON".
2. Enter the code for your brand of TV into the remote while continuing to hold the TV button down. LED will go out during number entry and turn back on when the last digit is entered.
3. Release the TV button. LED will flash and go out if number is entered sucessfully, or flash 4 times if it detects an error.
4. Press Channel up or down to see if this has worked.

You can also use the code search function.

1. Turn on the device you wish to control.
2. Press and hold "CODE SEARCH".
3. Press and release the TV, VCR or Cable button. If programming an AUX position, press and release AUX first and then press the device type to be programmed.
4. Release "CODE SEARCH".
5. Press ON/OFF repeatedly until the device turns off. You may have to do this up to 100 times.
6. When the device shuts off press and release ENTER.
7. Try using the remote. If it does not function repeat steps 1 through 6.

I have the same tv - change the power supply. Corne Bronkhorst

This is know as a diffusion issue. Most times this can be corrected with some minor alignment on the pots on the YSUS pwb. Sometimes the YSUS pwb has failed and will need to be replaced.

you can try to unplug the set for one day and see if the set returns to originle settings.