Question about Toshiba 43H70 43" Rear Projection Television

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Toshiba 43H70 IT WORKED HAD CONVERGENCE PROBLEM. I REPLACED THE ICS CHIPS STK392-110.NO POWER THE RED LIGHT WILL FLASH 1 TIME. YOU CAN HEAR THE POWER CLICK WHEN YOU POWER ON.

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Ec1.images-amazon.com/media/i3d/01/.../MANUAL000001813.pdf -
Above is your user manual, below, is your service and repair manual. http://www.givemefile.net/smanuals/project_tvs/toshiba/file/31179.html

Hi, well I applaud you for wanting to have a go, but you must make sure that you are starting in the right place, That is The Power Supply, as, if, that isn't right nothing else can be. But you simply cannot do anything without a Service Manual. In this it has everything one needs to repair the set. OK if it is shutting down, after that amount of time, of working and then faulting, then it is most definitely a "Thermal" problem, the way we "Find" problems such as this is "Freeze Spray" you use this on each component that is suspected of being the "Culprit" and you will soon,find that errant component. Now also not every fault is a Capacitor, I see many, many people that think, that Capacitors are always the "Culprit" now while that may be true in a few cases, a faulty Electrolytic Cap, or ordinary, Cap goes faulty, this is only a SYMPTOM, something has damaged those caps causing them to "Fail". One MUST always find the root "Cause", otherwise if you just treat, the SYMPTOM, the "Cause" will just make the "Symptom" come back, in short order, as the prime cause still, hasn't been fixed., Now Capacitors hate AC ripple, or Over Voltage. That’s it. Oh.. and Heat, if these Capacitors, are too close to a Heat Source, then that’s a prime cause of failure. Resistors, hardly ever go faulty, and if they do, it is generally obvious. However it doesn't hurt to check values with our Multimeter. Remember though resistors are made, with up to 20% tolerance from stated value, as such, are not too critical, unless in Timing circuits etc. Always check, the Values, of resistors, as with any other component, with the power OFF. Now Diodes especially "Zener Diode", are another thing to check, those and ordinary "Signal Diode" should always be suspect. next we have Transistors and IC's. The Transistors MUST ALL be checked to see if they have a good, "Junction" this is done, with our meter set to "Diode Test" and usually are about 0.6 to 0.7. With IC's you must check, voltage levels, or Logic Levels, going in and out, have a look at the circuit diagram, and it will tell you what they should be. It is a good idea to always measure the Power Supply voltages, see if a "Rail" is Low, that will be because some component has gone somewhat or all short circuit, to Earth, now, if the "Rail" is Higher, suspect an "Open Circuit" component, like a Diode, or Transistor. The voltages expressed in the manual are spot on, ANY variation MUST be investigated. I have been doing all this for over 30 years now, and I do indeed wish, we could have a set of "Symptoms" and be able to say.. "Oh that’s the so-in-so and replace this" however unfortunately this although does happen, most "Symptoms" can have literally tens, of "Causes" all often "Interlinked" One simply has to do a methodical troubleshooting procedure, and always think, "are my Voltages Correct" as this is how, you Fix the problem, by making them so. Keep up the good work. If that link above doesn't furnish, a Service manual, it is imperative you get one, even if you must pay for it. It will pay for itself in about 2 mins. The Tools you will need are A SERVICE MANUAL a Good Multimeter, a Signal generator, a Signal Tracer, pref an Oscilloscope, Soldering Iron, De-soldering iron, Probably, too, A SMT Hot Air desolderer (for the Surface Mount IC's), Compressed Air, An Anti-Static Wrist Strap, (MOST IMPORTANT, to prevent ESD), Cutters, Screwdrivers, sometimes, Torx, drivers too. Tweezers, are real handy, a magnifying glass, or eyepiece, a good strong white Light. OH, and you MUST have the original remote control too, (Sometimes one must obtain, purchase, a special “Servicing remote”) as one needs this to "Program" the Computer in the TV, after, and during servicing, and to be able to put the TV, into "Service Mode" too.

Posted on Jul 12, 2010

  • Edward Bingham Jul 15, 2010

    the tv was working the blue convergence was bad i replaced the 2 ic's. now the tv willnot come on the power light blenks 1 time .i check all my soldring it looks fine. what went wrong

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I HAVE A TOSHIBA 43H70 I BOUGHT IN 2001 AND THE RED AND BLUE ARE OFF ON THE RIGHT SIDE. I HAVE TRIED TO USE THE CONVERGENCE BOARD TO STRAIGHTEN BUT MY RED WILLNOT MOVE TOWARD THE BLUE OR GREEN. ON NUMBER...


This tv the convergence board are dead.Any colors R,G,B mis alignment,don't matches any colors lines.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts are dead,must be replaced to solved convergence problems.The Shop will cost u $300-350 for parts and labors.

Jul 08, 2010 | Toshiba 43H70 43" Rear Projection...

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Thanks for the info about the STK392-110 IC's. I


There are some low-value (1-2 ohm) 1-watt resistors in each convergence yoke circuit. Most often one will get toasted when one chip fails. Problem should be visible to inspection.

Jan 01, 2010 | Televison & Video

1 Answer

I am getting ready to replace the 2 STK392-110 IC for a convergence problem on my Toshiba 43h70. Where would I locate these two ICs so that I can save time trying to find them.


on the signal board. you need soldering iron and lead. make sure you won't short the STK pins..good luck :) and also check pico fuses.

Dec 29, 2009 | Toshiba 43H70 43" Rear Projection...

1 Answer

CONVERGENCE PROBLEM IN TOSHIBA 43H70


Replace both STK392-110 convergence IC's with Toshiba or Sanyo brand........no cheap junk IC's !!!.................T.

Aug 16, 2008 | Toshiba 43H71 43" Rear Projection...

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My 43h70 Toshiba TV problems


Did you check the resistors that power the ICs ocasionally 1 or 2 of them will go open when the ICs go out. They are located right next to the ics. Remove one leg of the resistors out of circuit, you will no doubt find one or two that are open and need to be replaced.

Apr 15, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

Convergence without a remote control


you will need the origional remote you can get one fast through this link just enter the model number www.replacementremotes.com
its normal after an IC change for the convergence to need adjusting, universal remotes can sometimes do it, but i have only seen that happen once or twice usually they wont have the right feature to adjust then save the settings.

Mar 29, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

Rplaced both IC's and now need fine tuning


You probably got 1 more resistor that is out of tolerance. These resistors have to be within 5% of their rated specs if not that's your problem. Check them with a digital meter with one leg of the resistor out of circuit for true readings

Jan 31, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

Resetting convergence daily on Toshiba 43h70


Hi Mark, tough call without putting a scope to the circuit, either the convergence IC`s are going bad, signal from DCU is going bad (digital convergence unit), or possibly bad solder somewhere in the convergence circuit, I`m afraid your going to need a tv tech for that problem, BMW Rider

Jan 02, 2008 | Toshiba 43H70 43" Rear Projection...

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Color alignment


You have bad convergence output ic's part #stk392-120. you will likely have to a technician intall these for you.

Sep 28, 2007 | Toshiba 43H70 43" Rear Projection...

1 Answer

43H70 Blue Convergence out of line and will not line back up


If the blue colors will not line up, and the blue appears to sag inward from one or more sides, then you can bet that one of your convergence IC's has either cracked loose or burned out. The IC should be resoldered or replaced and the convergence realigned by someone experienced with projection TV convergence circuits.

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