Question about Toshiba 50H71 50" Rear Projection Television

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Toshiba 50h71 red light after fixing the convergence chips

I have a toshiba 50h71 and I just changed the convergence chips last night. I tried to power it on last night and it is giving me a red blinking light. I checked all of the connection on the board that I had to disconnect in order to solder the chips and they are connected correctly. I know that this sometimes means that the TV is in "safe mode" or something like that so I left it unplugged all night and it still wont work. What could the problem be now?

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  • gilly20 May 20, 2008

    Where do you find the resistors that might be burned or open and how do I change them? There is a plug that is empty on the right side of the board that says P113 I think it has been empty the whole time because I cannot find any left over wires.

  • gilly20 May 20, 2008

    I have never replaced a do you check if they are open??



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I have the exact same TV and problem. I can't fine resistors R931, 932 etc, but I found 3 open fuses F850, F851, F852 (pico fuses I think) so I am going to change those but must assume they blew for a reason, right???
Wish I could find those specfic resistors.

Posted on Jul 08, 2008


Ok thanks I will go buy a ohms meter tomorrow and try sometime this week to find out what the problem is.

Posted on May 20, 2008

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Did you check to be certain none of the resistors were burned or open that power the ICs ? This is fairly common for one or two of the convergenvce resistors to be open when the ICs go out. Also double check the iC pins to insure that none of the pins are bridged with solder. If you need more assistance please let me know.

Posted on May 19, 2008

  • Sonny Berry
    Sonny Berry May 20, 2008

    Check the 15K 2watt resistors numbers R931 and 932, R936 &937, R941 -944, and R951 - 954 radio shack wont have those as they are metal resistant 15Kohm 2 watt metal film if any are open they will have to be replaced and new ones solderd in. You can get replacements at the following link.

    remember to unsolder one side of the resistor from circuit to check them

  • Sonny Berry
    Sonny Berry May 20, 2008

    You have to lift one side of the resistor from circuit by un soldering it then lift that side up out of the circuit then just put the leads of an ohms meter on the resistor legs and see if it registers. If it does its good but if it doesnt register its open and will need to be replaced


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1 Answer

Red power light on no picture no sound

a common issue with the model indicated is convergence circuit failure.

What I usually do here is locate the two stk convergence chips and unsolder all 18 pins on both.

If set now comes on (will look bad) you know one of the chips is bad and both need to be replaced.

Each is protected also with a usually 5 amp pico fuse, so if one of the two fuses is gone chips are bad.

the set will detect that the chips have no voltage and shut set down.

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Double image in 2 colors one color red ofset above and at about 30 degree angle

The convergence needs to be repaired. The 50H71 convergence kit works in your model as well. You can get the kit at the following link which contains the parts and instructions.

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One or both of the STK convergence chips have probably failed.

I can give you guidance on this if you are confident to do the repair. I had the same problem with my Tosh 40WH08B and after replacing these chips it works like new.

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1 Answer

My tv is showing a double picture in red its showing double in red

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.



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


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 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.

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1 Answer

Toshiba 50H71 Won't Come On

This could be caused by several different things.. your convergence amplifier ICs could be bad, causing 1 of the 2 pico fuses to open up.. another possibility could be bad solder or defective hybrid voltage regulator to be bad (its usually a light brown color).. worse case could be a cracked picture tube hidden by the deflection coil on 1 of the 3 tubes.. might also wanr to check if the horizontal output transistor is shorted..there is also a 1A pico fuse that could be open..

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1 Answer

Getting 2 images on top of each other on Toshiba 50H71

How To Enter Service Menu is what you need to know and replace both of your STKs these ic chips control convergence.If they are STK392-110s use STK392-180s better ics.

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1 Answer

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Yes the convergence ICs need to be replaced, however so dont the six 1.8 ohm 1watt resistors as Toshiba recomends replacing those six resistors when the ICs are changed. You can get the 50H71 / 50H82 Convergence repair kit as the 42H83 is identical to the 50H71 series, so the kit will work for your model. Heres the link where you can get the kit.

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Toshiba 50H71

you need to replace both the convergence ICs they are STK392-110 you can get new replacement ICs at the following link and they will provide free instalation instructions with pictures so you can do the repair yourself. Heres the link.

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2 Answers

Toshiba 50H71 projection tv

You need to replace both of the convergence ICs they are number STK392-110 you can get new replacement ICs at the following link and they provide free instalation instructions so you can do the repair yourself which tkes about 30 minutes to do and saves you about 400 dollars. heres the link.

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1 Answer

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set most likely has bad convergence ics J.D.W.

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