Question about Toshiba 55H70 55" Rear Projection Television

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How put stk392-110 part in the TV to fix the double imagas

Mr.
i have a 55h70 toshiba tv for 6 years, now tv got double imagas, this is second time happen in 3 years, we want to try fix by self. please hlep us.
pearl

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Unless you're really good at electronics this is NOT a job you want to undertake... I do understand your frustration though and I might suggest that you have it repaired this time in the shop only have the tech install STK392-150's at Q751 and Q752 instead for an improved reliability and discuss with him/her their findings on the value tests for the yoke return resistors in that circuit. There are several 1.2 ohm / 1w resistors in that circuit that if they change in value can add additional stress to the convergence amps. Some of the OJT techs I've trained always get the lecture to test what feeds the problem or it will come back more hungry than before. As an example R7711 can change in value as much as 5 ohms placing such an undue stress that could increase the op temp as high as 175 degrees - hot enough to cook a meal. But with the higher amp rated Ic's and the feed resistors all operating within tolerenace there's no reason it couldn't run another six years before seeing another repair...
Bill

Posted on Dec 07, 2007

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1 Answer

I get a double click when I turn on the set... The red light blinks with 5 seconds intervals. When on occasion when I turn it on and get one click the tv comes on but will black out about 15 to 20 minutes...


Hi
A common problem for these is bad capacitors in the power supply, Remove the back from your Tv and look at the power supply on the left hand side.

You will see roughly around 9 x capacitors that are bulged / domed shaped on top usually these are valued at 3300uf 10V any that have bulged or leaked a brown like substance should be changed.
This will cure the problem as they overheat being sat next to a heatsink that gets very hot!
Try and change them for the same 3300uf but a higher voltage.
Hope this helps

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1 Answer

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I used the SONY stk180's on my 55h70 and works great...2 years no problem.

Get the real thing though....the knockoffs do fail

I also made sure the contact surfaces between the IC's and the heatsinks were properly cleaned and used "Arctic Silver Thermal Paste" applied in an even thin coat on all contact surface areas.

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1 Answer

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Remember the old VCRs, which would tear up your tape if you took it into any kind of environment that could create dew inside?

This could be happening here too. Let it warm up for a day and try again.


Mr Bob

Feb 03, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

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sounds like loose connections on the convergance amps ic's
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Dec 24, 2007 | Toshiba 55H70 55" Rear Projection...

1 Answer

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sounds like loose connections on the convergance amps ic's
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Dec 19, 2007 | Toshiba 55H70 55" Rear Projection...

1 Answer

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The Toshiba 55H70 is a standard rear projection set. It does not have a "lamp", it has 3 picture tubes. When the colors suddenly do not line up on the screen, it means that one of your convergence output IC's has burned out and needs to be replaced. This is very common on those sets. If your set is using the STK392-110 IC's, it is probably a good idea to go ahead and replace both IC's with the newer upgraded STK392-150 IC's. The IC's should be replaced and the convergence circuits realigned by a qualified tech familiar with Toshiba projection sets.

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1 Answer

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sounds like loose connections on the convergance amps ic's
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

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1 Answer

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your tv IF circuit needs to be align take it to a tech.if you are using antenna then you change the position of the antenna.good luck.

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1 Answer

Toshiba 55H70 had convergence problem fixed that now vol.went out


check to make sure that the tv switch on the back panel for surround sound is not in the on position check the customer menu to make sure that the speakers are turned on

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