Question about Toshiba 57H81 57" Rear Projection Television

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My Toshiba 57H81 has a 'jittery' picture.

Hi, I have a Toshiba 57H81 projection tv. The picture looks like a sound wave from on a scope. It is 'jittery' right to left. If I use the POP and bring up the 2nd picture, it is crystal clear, even on the same channel. However the first picture remains 'jittery' and wavey. Any ideas?

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  • amadflyer Mar 08, 2009

    What resistors am I changing? I have not done any repairs yet.

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I have the same prob need to change the resistors as a first resolution. there should be 5 of them, if you dont soon and i mean soon you could cause the skt to go bad and have to start over in your repair

Posted on Mar 08, 2009

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Projector TV's have a tube for each function e.g. Video 1, Video 2, TV. Does the TV just not work or the VCR<DVD<Game console modes not work as well? If one works and the others do not you should be able to replace that tube, module, piece.

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Bill
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premtech@willapabay.org

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This is a common fail for a Toshiba 57H81 the cause most likley is caused by the Hyper board, there are several capacitors that have weakened and need to be replaced, these are surface mounted and have VERY Fragile contact points, if your soldering skills are week you might want to take this somwhere to have it fixed

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1 Answer

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Check all fuses in the power supply and look for any bad connrctions on the PCB. You are probably missing the 130 volt supply to the horizontal circuit. Common reasons are: Shorted horiz output transistor; flyback transformer, picture tube arcing , bad power regulator IC. In short, you need to get a qualified tech for this symptom. Hope this helps.

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1 Answer

Toshiba 57H81 picture bounces. Can't tell if horiz. or vertical.


Unstable picture, wavy, jittery, and loss of sync are a symptom of bad capacitors in the hyper module. The problem is worse when the set is cold, but when warm the sympton gets less or goes away. In the latter stages the problem never gets better even after the set has been on for hours. There are about 6 surface mounted caps (10mf/16) inside the shielded Hyper module. The module is vertically mounted behind the jack panel and can be unplugged from its socket after unsoldering the 4 anchor tabs on the bottom side of the PCB. This type of repair should be made by a qualified technician do to the complexity of chassis removal and expert soldering skills.

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