Mitsubishi CK-3536R Troubleshooting

[RonG]

Good morning,

About 6 months ago, a friend gave us his old TV as he was upgrading t
plasma. At the time, he told us that there was a small problem wit
the TV that he described to us (I figured that for free, I'll live wit
it ). Occasionally, the picture would get fuzzy and grow muc
darker. Reds seem to dominate (at least on fleshtones), but othe
colors are there as well. Sound remains fine. His solution was to tur
the TV off and on. He said it never takes more than a couple of tries.
And so we did; life was good for several months.

Over the past month or so, other strange behaviors have surfaced.
Shortly after turning on the TV, the picture will be lost, replaced b
a series of B&W static bands (about 3 or 4, horizontally, go across th
screen); these will then go to a full static screen, which graduall
goes to black, and then the regular picture returns. At the same tim
this is going on, the sound also provides a wonderful array of wha
sound like test tones, which change with the picture, and which lowe
in frequency as the picture gets darker. It returns to normal as wel
when the picture returns.

Well, life is not so rosy for the past couple of days.....
I'll still get the B&W test pattern thing, but now after that, all
get is the darkened picture with good sound. I can make out shapes an
things, but that's about it. No number of on/offs have any affect. I'v
tried using the degaussing button on the front panel. I've trie
unplugging the TV, letting it set for 10 minutes or so, and the
plugging it back in. All of the input selections on the TV act th
same way.

While I'm an electronics hobbyist at times, and am somewhat adept wit
a soldering iron, I have a feeling that a repair of this sort is out o
my league, if it's even repairable. I know enough to keep my finger
out of the back, having no desire to meet a charged capacitor in clos
quarters .

So, my question is mostly about the likelihood of a successful repai
at a "reasonable" cost. I'm not sure what reasonable would be, given
don't even know how much this unit would have cost new. (I believe th
set is about 12-13 years old). But, having spent about $500 to repai
our Mitsubishi projection TV, I don't expect it to be $25 bucks. An
idea where the problem(s) may lie and how extensive the repairs woul
be? Any chance at all it could be a DIY repair?

Thanks for any help you might provide.

Ro

 

[Leonard Caillouet]

I have repaired many of these sets and have found that on this model, you
will likely have several dozen leaky, high ESR, and/or low uF value
capacitors, some corroded traces, some heat damaged and bad solder joints,
and possibly a weak CRT. These tubes have held up quite well, but it should
be tested by someone who has good tester and is familiar with how to read it
to determine if it is practical to repair the set at all. You could
probably repair it by just replacing the leaky caps, cleaning, and repairing
the circuit board traces and joints, but you may have other problems that
require troubleshooting.

We charge a flat rate of $240 labor (in shop) for these repairs, + parts &
materials, + pickup or service trips if you don't bring it in. Of course,
most people don't and we end up usually testing the CRT in the field,
pulling the boards, rebuilding them, testing on a shop CRT, and
re-installing them. This set is a monster to move. If you get someone to
do it, they should be ready to go over the boards and find ALL of the leaky
caps or you will be doing more service on it later.

If you are patient, thorough, and have good circuit board rework and
soldering skills, you could possibly DIY for the cost of a bunch of caps.

Leonard

 

[RonG]

Thanks, Leonard,

That's great information. Certainly something to chew on a bit.
appreciate your taking the time to post it.

Ro