Question about Toshiba 55H70 55" Rear Projection Television

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Toshiba 55h70 schematics

Thank you again for the help. I have looked at the board and even left one leg of a resistor that I determined was part of the vertical green circuit but it checked out to be good. There are no noticable bad resistors on the board. Would you have a link to a site that has the Toshiba 55h70 schematics?

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You can get the entire service manual emailed to you from the following link.

Posted on Jun 08, 2008


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The picture on my Toshiba 55H70 is distorted. Most of the screen is fine, but the bottom left looks bent with all three colors misaligned. I tried adjusting the convergence some but it did nothing for that...

hello am rico, you need to replace your convergence ics (stk392 or 393 something esle). check for caps,fuses, resistors, cold solder in the boards. if you need more help, feel free to call at anytime. 602-810-7149.

Jan 07, 2011 | Toshiba 55H70 55" Rear Projection...

1 Answer

Image on screen looks concave(middle of screen looks farther away than left or right side.)

Your TV is out of convergance. You'll probably noticed that there are red, green, and blue images. You'll need to determine if the problem is in the power supply or the convergance board. Usually, the convergance amps go bad and opens resistors. Do you know how to read a schematic and use a multimeter? You will also need to know how to remove the old parts and solder the new parts into the circuit board.


May 27, 2010 | Toshiba 43HX70 43" Rear Projection...

1 Answer

Convergence problem w/55h70. red is ok but can't fix blue. Is there a component or board that is easily replaced?

Yes,U have some basic machanicals skills?The Toshiba Tv convergence board,it call a Hyper board.Try website to buy a refurbish board.This board no longer produced by Toshiba,if can't find it.The Convergence 2 STK ICS,and some or all it resistors,must replaced manually.Must have tools,and knowing how to do basic soldering,to do this.

Apr 06, 2010 | Toshiba 55H70 55" Rear Projection...

1 Answer

Looking for resistor value on Toshiba PB7243 Power convergence PCB Resistor is R7731 part of bias for convergence IC I think.. but looks burnt

R7711, R7721,
R7116, R7726, R7736, and R7731. are MF, 1.2 ohm, 2W resistors--MF means metal film or metal oxide--check all of them if you are replacing the two STK-392-110 CHIPS---

They are protect resistors in case some part of either chip shorts--if even one is bad--you need to replace both chips at the same time and adjust.

If you need help or advice let me know--I am here to help.

If this information helped you rate this solution as I do this here for free.



Jan 02, 2010 | Toshiba 55H70 55" Rear Projection...

1 Answer

I have a Toshiba 55H70 that started with convergence issues when we moved. I have done some reading and understand that this is a common problem. I ordered new IC chips and installed them, I also checked...

this is a very old set and the problem you descrbe , sounds like the ics are not getting their -32 and +32 volts and this could be a fuse i do not have a diagram on habd due to age and I checked toshiba website and they no longer support this set i can tell you that
the fuse im talking about has a label of FA something it looks like a rectalngle cap take a look arounf the deflection board that is the one with the flyback on it

Dec 10, 2009 | Toshiba 55H70 55" Rear Projection...

1 Answer

Toshiba 55H70 Wont turn on but we get the blinking light of death

it sounds like a flyback problem (the part is around 70.00 but it can hold high voltage so have a pro do it!

Dec 09, 2008 | Televison & Video

1 Answer

Hitachi 43UUWX10B

The resistors often burn out on that set when the convergence ic's go. The 3.3ohm 1/2watt metal film resistors those are usually the ones that burn out when the ic's go. you have to unsolder one side and lift the leg up out of circuit to check with a ohms meter. You can not check them in circuit make sure you lift a leg up to check or you will not get a correct reading

May 28, 2008 | Hitachi 43UWX10B 43" Rear Projection...

1 Answer

RK46 Changed - Still have clicking diode then the board dies.

I would check the standby voltages and see if they are correct and then move on from there. The flyback will usually have signs of heat around them, however that model really isnt famous for trouble some flybacks. I would check the supply voltages for sure that could give you a better leg to stand on as far as determining if a repair tech should be called in or not

May 14, 2008 | Hitachi 51SWX20B 51" Rear Projection...

1 Answer

STK392s didn't solve the problem

Hi. Im not 100% familiar with your model toshiba but they are all similar so try this. (1) RESOLDER MEMORY ICS ON THE TEXT BOARD, A COUPLE OF THE LEGS LIFT OFF THE BOARD. (2) RESOLDER ALL PINS OF THE OUTPUT IC'S, EVEN THOUGH THE DON'T LOOK DRY: Q750,Q751 AND Q753. RESET CONVERGENCE IN SERVICE MODE. CHECK RESISTORS, CPS, & REPLACE ANY BULGING CAPACITORS NEAR THE CONVERGENCE ICS. As I said im not to familiar with your model it may or may not have the exact components I have listed in parts (1)&(2) But its worth checking just in case it does.

Sep 09, 2007 | Toshiba 42H81 42" Rear Projection...

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