Question about Toshiba 50H72 50" Rear Projection Television

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Put new ic chips in and the problem still exsists

Put new ic's chips in my toshiba 50h72 and the screen still has a bow at the top and bottom really out of wack.on the blue convergance it will not go up or down is thier another problem to solve.thanks for any info that you might be able to help with

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Yes i assume the blue goes side to side? this is a good sign that the output resistors have been blown.also make sure the fuses. on the convergence supply have not blown. but ussally if you have any control of convergence this should not be the problem. this resistors are ussally adjacent to the chips and are larger type 1/2 watt. u still may have to set up convergence manually. Willie@fordtv,com

Posted on Feb 08, 2008

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Many times when the convergence modules go bad, they blow some of the resistors that feed it power. Look for little small low resistance resistors right in the vicinity of the modules.
Hope Ya Fix It.

Posted on Feb 08, 2008

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1 Answer

My 57hx81 has a slight concave bow in the middle top to bottom


Sounds like a problem in the vertical sweep circuit. Check voltages to your convergence ICs. If they are  not to spec then look for bad fuses and capacitors on the power board. These will throw off the DC voltage to the convergence chips causing the bow effect. I've had a single bad pico fuse ($1) cause this symptom. 

Dec 06, 2009 | Toshiba 57HX81 57" Rear Projection...

1 Answer

Toshiba 50H72 have blue and yellow ghosts


Sounds like your convergence circuit went out. It lines up the red,green and blue picture tubes so the colors are lined up. Usually these TVs all use the same type of IC chips called "STKs" both usually get replaced along with any resistors etc.. around these chips that may have burned up. Depending on who fixes it could be around $300-400 parts and labor.

Rustym62

http://www.the-tv-dude.typepad.com

Apr 26, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

The red seems to be out of place on my toshiba 50h72 projection t


Replace both convergence ICs they are stk392-110 you will also need at least the six 1.8 ohm 1watt resistors. You can get replacement ICs and resistors at the following link and they provide free installation instructions so you can do the repair yourself.
heres the link.
http://servicemanuals.vstore.ca/

Jan 18, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

Red & Blue lines on screen


stk392-110 i think mine was made in 2002 and i also had to replace mine

Oct 26, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

50h72 replaces ic's but still don't work


Did you replace the convergence resistors along with the Ics? Also if you replaced the ics with open resistors you have most likely ruined the new ICs. You can get a convergence repair kit for your model at the following link which has the ICs and the resistors for your model, and they provide free tech support and instructions.
Heres the link.
http://servicemanuals.vstore.ca/

Oct 25, 2008 | Toshiba 50H72 50" Rear Projection...

2 Answers

Toshiba 50h72


STK392-110 Convergence ICs you will need two of them. You can get replacement ICs with free instalation instrcutions at the following link.
http://servicemanuals.vstore.ca/

Jun 22, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Toshiba tos-50h81 convergence issue


you have this in your menu. but your menu will not adjust and fix your problem. if all three colors are bowed in at top and bottom...red green and blue... then you need to change all convergance ic's and check fuses. also there might be some solder in fuses hiding on the board. Need to also check all fuses around conv ic's and around conv yoke plugs.
good luck.

Apr 10, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Convergance issue still exists


did you ever solve this?
v_incent_mills@hotmail.com
I have the same problem with mine.

Mar 21, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Bowing image top and bottom of screem


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

Oct 30, 2006 | Toshiba 55H70 55" Rear Projection...

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