Question about Hitachi 50GX20B 50" Rear Projection Television

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Convergence problem? or something else? HELP!!

I got a service manual on my tv off the internet. I have located the convergance chip. Unfortunately, i live on a tiny island in Hawaii and we dont have any kind of electronics repair shop nor anyone on island with that trade. My only option is to put on a boat to a neighbor island and then ship back. Might as well look at buying new tv. But i thought i would atleast make a small investment to try and saving my tv. Now that i have the service manual, is it safe to say that my tv is indeed having a convergence problem?? Does the pink/purple/green colors spashed all over my screen symptoms of a bad convergence chip? If so, i was going to purchase and do the saudering myself. I am a computer techy guy by trade and think i can give it a shot. What you think??? Thanks, Bryan

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Re: Convergence problem? or something else? HELP!!

Does the TV have a "Magic Focus? button on the front of the TV? If you try the magic focus does it complete or does it halt with an error code?

Posted on Apr 28, 2007

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Got new STK392-040 chips and picture is still distorted. Manual convergence still won't alligne all colors.

the 183 is entry into the tech menu===you need to test all the low value resistors around the convergence chips(only 6 or 8) and they will read low and a resistor with NO reading may be your problem.

Also these sets use a pico fuse going to each chip--either right with it or back at the source----know what a pico fuse looks like"

Mar 12, 2012 | Samsung HCM4216W 42" Rear Projection...

5 Answers

Convergence problem???

yeppers..those chips are soldered(more like welded) into the board, and usually runs you around 300 to 400 buckos..

Mar 02, 2008 | Sony KP-65WS510 65" Rear Projection...

1 Answer

I have sony tv kp-65wv600. It has problems. color and video is blurry, double vision, letters are curved

You have a convergence failure.

Convergence IC failure is very common. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.

Try This:
When you notice the symptons Use this simple test to verify.
Go to the users menu on the tv.
Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.

If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section.
If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.

If you can move both in each direction then the problem is something else.

Note if one STK chip fails, you replace both regardless

Feb 24, 2011 | Projection Televisions

1 Answer

Panasonic PT-47WXC43G green ONLY is bowed on bottom and top

It still convergence chip problem, check big resistors nearby these chips that would be open or devalued and causing problem, specially in green convergence area, your green tube/ gun is just fine and just not getting convergence output signal to show correct image.
I would suggest to download service manual copy of this tv for small fee from any website and fix the issue with schematics help.

May 02, 2010 | Panasonic PT-47WXC43 47" Rear Projection...

1 Answer

Where is the convergance Chip located in this television SOny Projection KP51WS510?

Remove back cover of tv and on left side thee is D Board that has 2 big black ICs mounted on big aluminum heat sink, these are convergence chips in Sony KP-51WS510 tv.
Below is an exploded view taken from service manual and convergence out chips location is marked with red just to give you an idea.
Hope this info will help you.


Jan 23, 2010 | Sony Projection Televisions

1 Answer

Toshiba 65hdx82 convergence problem, pincushion

Your TV most likely a failure in the convergence circuits. ( 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.
Here are some photos of convergence problems.

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.


You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

May 19, 2009 | Toshiba 50H82 50" Rear Projection...

2 Answers

TV has halo effect on the screen

it sound's like have a convergence problem send me d model and make of d tv

May 11, 2009 | Mitsubishi WT-42313 42" Rear Projection...

1 Answer

Service code needed to complete convergence adjustments

I have the service convergence code: mute-1-8-3 (make sure your tv is on and set to antenna. if it doesn't work press S. Mode and make sure is says standard then re-enter code.

So, I have the code but I need the convergence chips. Where did you get the convergence chips?

Jan 26, 2009 | Samsung HCM653W 65" Rear Projection...

2 Answers

Convergence Problem

I will need the model number of your set in order to help you. Pleaserespond to this same post when replying.

Jul 11, 2008 | Projection Televisions

1 Answer

Green rainbow streak on bottom of TV PT-47Wx49E

If Convergence on setup dosen't work, And you think its not STK Convergence chips!, Then "Yes" It more then likely will have a few open Resistors!... (Near STK chips)

Jun 24, 2008 | Panasonic PT-47WX49 47" Rear Projection...

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