Toshiba TP71g90 power supply troubles


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Toshiba TP71g90 power supply troubles

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PoXFreak
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Jul 6, 2008, 6:33 PM

Post #1 of 3 (41 views)
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Toshiba TP71g90 power supply troubles	Can't Post

Here we have a nice Toshiba Cinema Series projection TV, Model TP71G90, in extremely nice shape. There's one problem with it; the power supply has a glitch somewhere that I can't find without a service manual, which I also cannot find.
The set powers up and runs, but the first thing you will notice is the word "VIDEO" on the bottom right is cut off, and only spells "VIDE". After being on for about 5 minutes the picture finally levels out and becomes square. After about 30 minutes or more, the picture decides to "lose weight", by getting skinnier and taller, bowing at the top and bottom with only a slight convergence issue throughout (I have reworked the convergence section, and replaced the STKs', along with 2 resistors).
For the life of me, I can't seem to find what capacitor or resistor is causing this problem. The output from the voltage reg. IC is dead on anytime a reading is taken, so that rules that out. All the large power caps have been removed and tested, and I even replaced some that just "looked" bad.
I'm running out of patience with this set, as it is already 10 yrs old, but it has such a nice picture when it is running right.
ANY help would be greatly appreciated.
(May post pics to show whats happening, but I think y'all get the idea)

fujianwangjian
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Jul 6, 2008, 10:40 PM

Post #2 of 3 (36 views)
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fujianwangjian
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Jul 6, 2008, 10:40 PM

Post #3 of 3 (35 views)
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Re: [fujianwangjian] Runescape items,Rs accounts, Runescape Gold [In reply to]	Can't Post

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