Damn Moose, you're braver man than me.
Charlie
On Thu, Nov 13, 2008 at 6:04 PM, Moose <olymoose@xxxxxxxxx> wrote:
> Here's some snaps of yesterday's project.
> <
> http://galleries.moosemystic.net/MooseFoto/index.php?gallery=Tech/Mitsubishi
> >
>
> I've had a large screen projection TV, 55" Mitsubishi, for something
> like 10 years.
>
> Quite a few weeks ago (too many to freely admit to), it started acting
> up. the picture would turn into something like a sideways hourglass,
> pinched in at the middle and going off the screen in the corners. And
> each color would do it differently, giving a nice, psychedelic effect.
> The amount of the effect would vary.
>
> At first, it would go away as the TV warmed up. Out of sight, out of
> mind, right? But it slowly got worse.
>
> So I got on the web and started nosing around. There's this nice repair
> pro on a forum who shares his knowledge for us DIYers. turns out this is
> a common problem with older Mitsubishis. The Convergence ICs start
> failing. I find out which ICs of which brands are the best replacements
> and a seller in Canada with reasonable prices.
>
> In the mean time, I know know where they are and how huge and exposed
> their heat sink is. So I put a small fan inside, directed at the heat
> sink. Voila! Turn on the fan and within a few seconds, the picture
> corrects.
>
> The ICs and thermal compound arrive, but it looks like some job to
> replace them - and things are working fine with the fan ...
>
> Weeks pass, we switch from cable to Dish satellite service; we fall in
> love with the HD picture and fabulous DVR*. Then the picture starts
> acting up again. Oh-oh! I've known, but been ignoring, the danger that
> complete failure of an IC an take some pico fuses, soldered to a board,
> with it, meaning more work to repair.
>
> So yesterday, I finally got out my round toit and took the plunge.
> Actual time to replace the ICs, maybe 45 min., and I could do it again
> in 30 or less. Total time to work out the details, get the chassis out,
> take snaps of cable connections so I would get them back right,
> manhandle the chassis out and in and clean up? Close to five hours. Of
> course if I were to do it again, it'd be half that or less, but I like
> to go nice and slow and careful first time around. All I need is to
> break one of the picture tubes.
>
> The outcome was worth it! Picture all well again. :-)
>
> Couch Potato Moose
>
> * The VIP722 DVR is the reason to choose Dish over DirectTV or cable.
> --
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>
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