I just inherited a Mitsubishi 6043A and it has a couple of problems. Initially, the picture was OK but had vertical bars that appeared to move down the screen (not too distracting, but noticeable). Also, it sometimes powers up without picture. I can hear sound, but the screen stays black. Turning the TV off then back on usually fixes this problem. It happens when the DVD player is on before the TV. Today, the picture lost most color, and appears sepia. It seems like a loss of blue. Any idea on repair costs or ease for DIY?
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Re: Mitsubishi 6043A Loss of color
Sounds like many different problems maybe related thou. You say 6043a but you are under WD-62327. So this info is for that.1. Suspect the Light Engine part # 939P977020 also you could need.. Suspect the Signal PCB part # 930B923002 if no video keeps up
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It has been my experience with that model mitsubishi that the usual culprit is loss of vertical sweep. If the beams in the picture tubes stops moving up and down this is detected by the micro processor and the video is blanked, but the set is not shut down. The usual cause of loss of vertical sweep is bad solder connections on the deflection yokes or a failed vertical output IC.
I have the same TV built in 99. My problem is similar but the vertical hold gives out when the tv warms up about 5 minutes. I will attempt to locate the vertical hold circuit and replace any parts I suspects may be the problem. I suspect a cap is leaking or transitor around IC700 is degrading when warm.
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok
Severe vertical jitter on picture, horizontal sides of picture ragged
Replacing the TDA4950 cured the fault
White line down centre of screen (top to bottom}
To be honest, your bulb probably went out if you're missing colors, or they are slowly burning out. I'd say check behind your screen while it's on. If that's the case, those are usually 100 bucks a piece. I've said this on many problems so far, but if that's not the case it's most likely the color "tubes" in the back out of wack. There's a way to adjust it from the remote but if you can't get it back to normal they may need replacement which is very expensive. I'd say if it comes to it, get it checked (usually 20-50$ for a house call estimate) and if it seems like to much, search around your local want ad for one with a broken screen or something and just use your parts in a different TV. (www.criagslist.org is usually a good place to look)