Question about Toshiba 43H70 43" Rear Projection Television

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Rear projection 43" Tv

I took the right (Green) board out to repair bending convergent red signal and now it is flickering rapid. The board was tested OK and two STK392-110 ICs (driver chips) was replaced with 2 from electronix by a service repair person. It didn't flicker before replacing the 2 stk392s. What could possibily be wrong with It? Bad stk392s or something else? Maybe on the tan board? Please help.

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  • Mike Smith Mar 18, 2007

    All connections were tight except for one which looked lke a small spark plug wire. It was with four other larger ones. see attached photo

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  • 398 Answers

The black box with 4 large red wires in it is the high voltage distribution box. One red wire brings the high voltage in and the other 3 bring high voltage to each of the 3 picture tubes. If those red wires are not all the way in and tight, then there will be high voltage arcing inside that box and the picture will rapidly flicker. Make sure all red wires are pushed all the way into those holes and your picture should be back to normal. Convergence IC's will not make the picture flicker, so I am sure your IC's are fine.

Posted on Jul 15, 2007

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1 Answer

Seems two be out of focus with green and red blurr.


The convergence board is what is bad, the Convergence IC need changed out on the convergence board, or the convergence board itself, and you you can also check for blown fuse on the convergence board. The repairs are going to run around 450 on getting it repaired. The red, green, and blue color are alien through the menu, but if they don't line up, it needs repair.

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TV rca hd 52w59 has convex picture. can I fix it.


If convergence adjustment did not correct the problem likely the convergence IC's have failed and will need to be replaced along with a few defective resistors in that circuit. If you have never attempted TV repair this would not be a good repair to start on.

The only way to be positive of the problem is to have the circuitry diagnosed by someone with the proper TV test EQUIPMENT to determine what parts that are no longer within specs.

KEEP ME UPDATED..

Sep 29, 2008 | RCA D52W19 52" Rear Projection Television

1 Answer

Slight convergence problem after changing convergence circuits


My experience has been that the resistors have fallen out of range. These aren't expensive and neither are the caps that surround this area. If you're pulling the board out to change the resistors, might as well change the caps, too. If you're strapped for cash, but have a multi-meter, you can test the caps and the resistors after they've been taken out of circuit to save a little green. Let me know if you need any help testing them; I'd be glad to help.

May 22, 2009 | Toshiba 65H82 65" Rear Projection...

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Red and Green flicker after replacing FL231


Go to the R/G CRT boards at end of neck of picture tubes resolder socket pinns and Video ICs on the board.

Feb 09, 2009 | RCA HD52W59 HDTV Projection Television

1 Answer

Bowed flickering green screen, black on bottom


Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

Jan 25, 2009 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Picture is squished in on all 4 side of TV and colors are all dis


You will not find the problem in deflection board it will go back to convergence board,I repaired one that would not Magic focus cause was on connectors from power board to convergence board the one closes to up front of board one of the pinns was bent under so when i pluged it back in did not know after lifting up connector under tiny pins 1 of them was bend under straighten it so it could plug in right Fixed problem.

Dec 17, 2008 | Samsung HCN529W 52" Rear Projection...

1 Answer

Samsung pcj522r


If they tested the convergence board and thats ok, the only other Items it could be are the Digital convergence unit or the Velocity comando units that control the convergence yokes. If the convergence isnt adjustable with magic focus adjustments wont help it. Is the repair shop an authorized samsung repair facility? If you need more assistance let me know.

Jul 26, 2008 | Televison & Video

1 Answer

32 lcd flat screen


oh u posted the request here huh?
i was lookin into the premium request.
ok here you go..
Technically speaking, there is no such thing as "ghosting" on digital
Ghosting might visualy describe it, but if you're not watching analog then that's not the problem. The problem is most likely in the convergence.
First thing first - If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service.
If you don't have any repair experience my suggestions can only be usefull to get a repair estimate, or in order to get more familiar with these kind of problems, impress your local repair person etc..
actually tat effect wil be in some red colour..(assuming tat its of red colour).. ur case is with green.. but i shall say u in red.. u just convert it..

switch to test mode to check the red crosshair compared to the green or blue - if it seems out of focus, open the set and mark the position of the lense. Then adjust it to tighten the line.
Find out why the Red has shiffted(pin trouble). look for bad solder joints on that board. Its also Possible that you have a failed component
Try resoldering the STK Output IC's very carefully. In a worst case scenario , you may need to change the STK that controls the Red Convergence .
Yank out the convergence board(the one that has several controls) on it, then you will find a few contols that have RED PIN (whatever). on them. Adjust them untill you get it right

problem solved.

May 01, 2008 | Televison & Video

1 Answer

Convergence Problem


I'm not a 100% positive this would fix your TV, but I found the convergence board on PartStore.com for about $80. Hope this helps.

Nov 16, 2007 | Akai PT5598HD 55" Rear Projection...

1 Answer

TV Flickers up and down and screen is shifted to the right w/ red color dominating the screen.


the last hitachi that had this problem i fixed it bad finding bad solder conenctions throughout the board that the convergance ic's are on, also i foind some on the two main board in my repair. hopefully resoldering the convergance foard will fix the jitter or jumping around problem. if the picture is too red you can also try turning down the screen control slightly. good luck

Jan 02, 2007 | Hitachi 51F500 51" Rear Projection...

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