Question about Toshiba 55H70 55" Rear Projection Television

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Bowing image top and bottom of screem

I recently noticed the convergence was off on my Phillips rear projection Tv. When I fixed it, I noticed that there was a bowing of the image both on the top of the screen and bottom of the screen. I have heard people describe it also as "hourglass" like. My problem is minimal as I can only see slight bowing on the top of the screen and bottom and that is the only place of distortion. Can someone suggest what to do to fix this problem? Is this something fixable without repacing any parts?

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Re: Bowing image top and bottom of screem

No im sorry there is nothing to do but replaceing the convergence IC

Posted on Oct 30, 2006

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I have a Phillips 60" rear projection TV. recently

Tv have a problems known as a convergence problems,it is dead.The tv convergence board it is dead,that why ur tv picture are R,G,B colors lines mis alignments,have colors shadows picture or 3D picture lood alike?The tv convergence board require changes 2 STK convergence ICS and some or all of it resistors too.To fixed the tv convergence board to solved the tv convergence picture problems.The shop will cost u like $300-350 for parts and labors.

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The pic is off there is bowing at the top and

Picture becoming distorted at the top/bottom of the screen is due to the convergence circuit going bad, and is a common issue with big screen projection TVs.

The convergence circuits will need to be repaired, which will generally require some soldering and ordering new parts for ~$75. If you want to get a TV technician to repair it then you will probably be looking in the region of about $300 for a repair.

Here is a link to repair guide for a Mitsubishi TV. Obviously a different model, but the convergence circuits are generally the same for most makes/models - this will give you an idea of the work involved to fix it:

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Bowing of picture at top and bottom towards center.

Projection sets have two very common problems outlined below.

The first common problem is convergence

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. The TV can also shut down when the convergence starts to fail.

Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith, RCA and others.

You can more info and a DIY convergenece repair kit with instructions from TV Repair Kits using the link at the end of this article.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped or bowed
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture


You can see some more examples and find a fix using this link on Fixya

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1 Answer

Red convergence bowing

Replace both of your STKs if they are STK392-110s upgrade to STK392-180s these are the convergence ic big black ics 2 of them. Electronix Parts 1-800-223-3205

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ok go into setup menu.... go to convergence.. try to adjust convergence .. does the crosshair move up and down side to side... if not then you might hqve q poblem with convergence power supply if they move then u might have s setup issue

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Help tv is showing double text at bottom and bowing colors

Convergence ICs are bad and need to b replaced there are two of them theyost about 10.00 each.

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