20 Most Recent Toshiba 43H70 43" Rear Projection Television Questions & Answers


I made a couple videos about reading and testing resistors. Keep in mind, if you're reading a resistor while it's still in the circuit, it might not read the value that it says on the resistor because of the circuit it's in. While in circuit it can only read the value of the resistor or less. If it reads more ohms while in circuit, then the resistor is probably open. My meter reads OUCH when it's open and 0 when it's shorted.

Toshiba 43H70... | Answered on Jan 28, 2016


yellow would mean it is losing blue and if model indicated here too old for a shop repair.

Toshiba 43H70... | Answered on Dec 15, 2012


If the model listed is correct the only way to know if the stk-392-110 chips this set uses for convergence are causing shutdown is to unsolder all pins on both chips and see if set comes on.

Toshiba 43H70... | Answered on Jun 02, 2012


sounds like a short in the convergence circuit based on model number listed here,
4_18_2012_3_01_20_am.jpg

Toshiba 43H70... | Answered on Apr 18, 2012


child lock- make sure its not on....

Toshiba 43H70... | Answered on Nov 01, 2011


Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.

Toshiba 43H70... | Answered on Aug 11, 2011


Try unplugging TV while it is on and let sit for 20 minutes. Re-connect and see...
It sounds like your horzontal control is bad. It requires a new circuit board.
Mastersage!

Toshiba 43H70... | Answered on Mar 27, 2011


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.

Toshiba 43H70... | Answered on Jul 15, 2010


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.

Toshiba 43H70... | Answered on Jul 08, 2010


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.

42d3683.jpg

7859b01.jpg

e87380c.jpg
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

69189a5.pngCONVERGENCE SOLUTION

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 TvRepairKits.com 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.

Toshiba 43H70... | Answered on Jul 03, 2010


Projection sets have two very common problems.

The first common problem is convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Toshiba 43H70... | Answered on Jun 06, 2010

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Toshiba 43H70 Service Manual Download


Download Toshiba 43H70 Projection Television Service Manual

Models: 50HX70 / 55HX70 / 61HX70 / 55H70 / 61H70

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I hope that helps.
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on May 10, 2010 | Toshiba 43H70 43" Rear Projection...

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