Question about Toshiba 50H81 50" Rear Projection Television

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Convergence issue, replaced convergence chips, now blinking red power light and no picture

Just replaced the convergence chips on my Toshiba TN55x81 TV. Put the board back into the tv and now I only have a red blinking light at the front power button. What happened?

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Recheck all of your solder connections for bridging and cold solder joints. Check the large output resistors under the heat sink and the smaller ones to the left of them. Check all of the fuses on the power board. And make sure that you check all of your connectors carefully. Also check that you didn't pinch a wire somewhere.
I am not being mean by saying that if you could power up before then more than likely the power up issue was caused by something you did.

Posted on Mar 02, 2010

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1 Answer

Have an older Toshiba theaterview TV, when turn on, we have no picture, no sound, just black screen and blinking red light that just continuously blinks.


Theaterview suggests a rear projection--in that case it most likely is in the convergence circuit--unsolder chips (convergence) and see if set turns on.

Some of their regular TV sets (picture tube) if the light is just blinking means the same thing=shutdown because of a short/problem but a model number would tell me which you have.

May 23, 2012 | Toshiba Televison & Video

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Toshiba TW40H80 40"


ok! maybe you have defective convergence correction circuit! sir do you have experience in electronic repairing?

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Red light keeps flashing on toshiba theatre. How can I fix it?


on the older sets it is a short and usually in the convergence circuit, the way to know is located the convergence chips and unsolder both from the board (18 pins each) and if set then comes on (WILL LOOK BAD) one of the two chips is bad and both need to be replaced----should be stk-392=110 chips.

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Red light blinking and no picture on Toshiba Model 65HX81 how do we fix?


Red power light blinking is shutdown--protective mode.

Before buying a remote I would see what is wrong with set.

The most common reason on this model is a short in the convergence circuit--uses two chips----method to see if they are shorted is to locate (not real easy on this model) and unsolder all 18 pins on each chip--if set turns on then(will look bad) one of the chips is gone and both need replacement.

The other issue this set has is bad Hyper boards that cause noise when cold and operate after warmup---more expensive to fix than a convergence problem.



3_30_2012_2_06_25_pm.jpg

convergence chips used in this set look like these

Mar 30, 2012 | Toshiba 65HX81 65" Rear Projection...

1 Answer

I have a Toshiba TN55X81 that has sound but no picture. Turned it one one day and no picture. I don't see any error code blink when I power on the set.When the set is turned off a line flashes across the...


It shouldn't be the convergence chips. You may have blown a pico fuse on the power board.
You should be able to safely remove the convergence IC's and try the tv without them as they only do image correction.

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2 Answers

TV WAS WORKING FINE, TURNED IT OFF, THEN TURNED IT ONTHE NEXT DAY


Your tv might have a defective power supply, and/or convergence circuit. The initial cause of the problem, if it is the convergence circuit, is usualy a loose conection on one or two jumpers close to the convergence output circuits (STK392-1110), in with case this chips might need to be replaced and a pico fuse of 5A on the power supply too. I hope this help you.

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1 Answer

My TN55X81 is showing the same problem.


Replace the IC's with STK 392-110T.
Toshiba has a Service Bulletin on this problem.

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This may sound odd but try moving the remote further from the set. I have seen similar issue with my 42H81.

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Toshiba TN55X81 Wont turn on but I hear clicking


Pull the three connectors to the yokes on the convergence board. If the set powers up, it's a good chance the STK392-110's need to be replaced. I fixed one today, and it has been running for 6 hours now.
-Dan

Jun 15, 2008 | Toshiba TN55X81 55" Rear Projection...

1 Answer

Blue convergence


They should be STK392-110 ICs you can get replacement ICs at the following link with free instalation instructions
http://servicemanuals.vstore.ca/

Jun 04, 2008 | Toshiba TN55X81 55" Rear Projection...

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