Question about Toshiba TP55G90 55" Rear Projection Television

1 Answer

Convergence IC keeps going out

I have replaced the convergence chip on my tv 2 times. The first time the tv ran for about 4 hours and the 2nd time it ran for about 14 hours and then failed. Does anyone have any ideas of what could cause these to fail?

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  • khara362 Jun 22, 2008

    I also replaced the convergence ICs in my Toshiba tp55g90. 
    The TV still goes into shutdown. I then pulled the +30, -30 OVP, OCP and +15, -15 OVP, OCP resistors off the board and tested them. They are very low ohm resistors: I think one is .49 ohm and the other is .79 (not sure about the other two). They were measured higher than that w my DMM. It is possible that my DMM does not measure ohms that low (200 ohm setting). 
    I had to search everywhere on the inet to find replacement resistors. I thought I found them and was sent replacement resistors but they are not an exact match (original is green in color w .49 ohm written on it, replacement blue w correct ohm color strips). 


    Does anyone know where I might find exact replacements for these resistors? Toshiba says the resistors are out of production. Anyone know where to find replacement resistors for the +30, -30 OVP, OCP and +15, -15 OVP, OCP?

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  • 8,617 Answers

Did you replace the resisitors that power the ICs? Usually 1 or 2 of them go open when the ICs go out, and if you dont change them they will take out the new ICs .

Posted on Feb 29, 2008

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3 Answers

Toshiba rear screen projection tv theaterview colors wavey? It no longer is visible, the colors are separated


1.) It sounds like you have a convergence problem; in the customer menu with the original Toshiba remote select convergence--if blue or red will NOT move in some direction you have a bad convergence IC.

2.) This set uses 2 STK-392-110 convergence chips; they and any open resistors around them need to be replaced and the set adjusted.

3.) If you are able to do this repair yourself you can save a lot of money--Most TV shops will charge 300-400 for this type of repair on this set.

4.) If you cannot do the repair yourself look in your area--now is the slow time of year for TV repair shops---if they say it "has to go to shop" keep looking----almost any good tech can do this repair in your home in about an hour--I have done hundreds of them here and charge 200-250 total depending on brand and model.

5.) I am here to help people and if you have questions or need advice let me know--the two chips this set uses you can buy on Ebay for about 12 dollars plus shipping.

I do this here for free, so if this information has helped you give me a vote here---let me know by replying here if you need more help.

REGARDS SD TECH

Sep 14, 2009 | Toshiba 50H82 50" Rear Projection...

2 Answers

Bowing at top and bottom, can't adjust convergence replaced IC


Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • 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.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

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

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

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

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Mar 22, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Convergence bad


resistor along the convergence are 2Watt size or less. they are easy to find as all of them are in pairs. if you find one is not the same on the other, then replace that resistor. change the 2 convergence IC at the same time. let us know.

Mar 22, 2009 | Philips 43P8341 43" Rear Projection...

1 Answer

Mitsubishi 1080 hd ws-65809 wont power up


This issue is almost always caused by a faulty Convergence IC inside your TV. These chips heat up and can become damaged over time. The most common cause I have seen for the picture distortion is the heat of the Convergence IC weakening the solder connection to the TV circuit board. If you look on various messages board you will see people rigging wooden dowels and other items to apply pressure to the chips in order to correct their picture issue. This works because when the solder joint is weakened the chip becomes loose and vibrations or pressure will cause it to work or not work correctly. Aside from all that information the correct fix is to have the IC chips replaces on your TV.

The solutions for this issue are as follows:

1. located a tv repair shop that will replace the parts for you. I had the same issue with my 65" Tv and the quote was $350 for the labor and parts.


2. You can ordered the IC replacements yourself online by going to google and looking up a reseller of the STK392-110 Convergence IC that is inside your model TV. You will need 2 of them and they cost around $6 each. If you have the soldering skills to remove the old chips and install the new ones this is by far the most cost effective route. It is a fairly simple process and guides can be found online.

Mar 17, 2009 | Mitsubishi WS-65513 65" Rear Projection...

1 Answer

The blu display on my sony 65" tv is arched, making the convergence adjustment in-effective.


its failure of Convergence Out IC chip and requires replacement.
TV has 2 IC chip in convergence circuit and I would recommend to replace both at same time.
Let me know exact model of Sony 65" TV to provide you more technical info.

Mar 14, 2009 | Sony KP-51WS510 51" Rear Projection...

2 Answers

Hitachi Television


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • 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.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

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

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

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

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Feb 18, 2009 | Hitachi 53UDX10B 53" Rear Projection...

2 Answers

Sony HDTV Convergence Issue


No, You will not solve the problem with only changing the convergence IC, associated resisters may also be required.
Beside of that, after spending time to get parts and replace the ICs, you need to make and adjustment the color lines (about 14 lines)
This adjustment without experience will take you about 3 to 4 times and 4 hours each to get thing right (if you areskillfull, most of people failed this adjustment).. The total time spend for this problem would take you full 24 working hours.
I successfully adjusted one set of my big TV (95%, need more more round)), on another set one I failed.

Nov 30, 2007 | Projection Televisions

3 Answers

Convergence chip


Convergence ICs cost around 15-25 each there are only two of them. I would go ahead and replace both of them because if one goes the other one will follow shortly. I would make sure that it is just the convergence IC not something else, and if its over five years old dont pay more than $500.

Nov 04, 2007 | Panasonic PT-53WX52 53" Rear Projection...

1 Answer

Convergence problem


you will need to replace the stk ic's they are mounted to 2 large heat sinks in side the tv. the ic numbers are on the chips themselves. i do believe it is stk392-510 for sony. once you have the number you can buy these anywhere online. just put new ones in and should be good to go. if this doesnt work then there are a few resistors and fuses by the ic's that sometimes fail.

Oct 11, 2007 | Sony KP-46WT510 46" Rear Projection HDTV

5 Answers

No power,red power lights keeps flashing.


I had the same problem with the 47" version. I called the Sears technician who tried for more than an hour to fix the problem, even calling Panasonic. Final solution: a board repair for $550. Now I have a plasma and a big desk.

Dec 02, 2006 | Panasonic PT-53WX42 53" Rear Projection...

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