Question about Pioneer SD-643HD5 64" Rear Projection Television

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Way too dark

My pioneer sd-643hd5 screen is really dark, it happened just all of a sudden, one second it was fine next its was really dark

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Besides being dark, are the colors inaccurate? If so, I bet one of your CRT's (Red, Green, or Blue) is out. When my green CRT went out, my picture was very dark and the colors were inaccurate (e.g. no green at all). My problem was caused by a bad solder connection on my Green CRT driver board which I fixed with the following procedure.

1) Determine which CRT is out (red, green, or blue)
2) Unplug your TV
3) Locate the Driver Board attached to the bottom of that CRT.
4) Locate the two large metal heatsinks on the driver board. Each has a transistor attached to it.
5) Carefully touchup the solder connections on each transistor (on the underside of the circuit board). I added some additional solder to help reflow the solder onto the pad of the circuit board. It's a bit tricky because the solder has to fill a large gap between the small leads of the transistor and large holes in the circuit board.

(If the above does not make sense, then it's best to leave the repair to a professional)

Posted on Sep 30, 2008

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This can occur because of a component failure. A reset is not likely to fix this. One thing you can try or at least observe, is whether or not this recovers once the set has cooled down. It is possible that there are aone or more bad solder connections inside that are causing this. Please update this if you can.

Thanks,
Dan

Posted on Sep 30, 2008

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Resetting the TV
NOTE:
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time.
1. Unplug the TV power cord from the power outlet.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.

Hope it may help you;

Regards,
VOTIT

Posted on Sep 26, 2008

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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
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