Question about Toshiba 57H81 57" Rear Projection Television

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Convergence problem on a Toshiba 57h81

Double image on our 57H81. Touch focus says error (red and green lines are staight but blue lines are not). Convergence only moves red cross over green cross. Blue cross can move up, down and to the right, but not left. Therefore it can't allign with green and red cross. I am a componet level repair technician, but never repaired a tv. Online search says I need to replace convergence Ic's. If this is correct is there a part # for this. Where can I buy it? Can you email me a service manual? My e-mail address is escorpiona08@gmail.com. Thank You any help is greatly appreciated.

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A service manual won't help you on this and yes it's most likely the convergence amps. That unit takes two stk392-110 Sanyo amps. You can substitue with stk392-150's or 180's also... Personally I'd get them from acme sales in florida along with any solder, de-soldering braid, heat sink compound and other supplies you'll need for the job. Acme, because you are assured of getting originals not some chineese knock-offs.
I'd suggest a package of 1.8 ohm/2w resistors, looks like that's what this unit uses in the yoke return circuit and they commonly have failed, and likely the cause for the amp failure. You might also take a meter to any picos in the circuit. F850, 851, 852 and see if any of them are open. If the amp opened you're okay, but if it went to ground it may have opened a fuse.
I will send the manual via Pando - so if you don't already have Pando go there first and download their free program.
Bill

Posted on Jan 17, 2009

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I'm getting a double image of everything on the screen in a hazy blue colour. I tried configuring the colour within the menu but the cross simply won't line up. touch focus seems to work with the...


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.

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My toshiba 57h81 tv is showing up double vision, looking like the red is off and not aligned. Also the touch focus in the menu says error whenever i try to touch focus it.


This tv have a problems known as a Convergence problems,it dead.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.This parts must be replaced to solved the convergence board problems.The shop will cost u $300-350 for parts and labors.

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sounds like to me that you need to replace the convergence IC's.

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Convergence board failure no autofocus, This is a common failure on projection tv's. Change the convergence board or the STK's on that board and or associated burnt resistors in that area.

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The convergence ICs and the six 1.8 ohm 1watt resistors need to be replaced. You can get the convergence repair kit for your model at www.tvrepairworld.com which has the Two Convergence ICs and the six resistors plus the CD with instructions on how to do the repair.

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1 Answer

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Often convergence issues do not require the entire board to be replaced. You can resolve it by replacing the convergence ICs. The part in question is STK392-110. You will need two of them and they cost around 10$ each. But replacing them is a pretty complicated procedure and I would not suggest it to someone without prior experience. A service manual should get you started in the right direction if you are planning to do this yourself.
https://www.completeservicemanuals.com/toshiba/crt-projection-television/57h81-service-manual/prod_1128.html

PS
: Disconnect from the power supply before you start the repair. Also read the legend, the hv circuits are denoted by a special symbol, so you will know what you shouldn't touch.

You may also need to replace the nearby resistors that may have popped the IC in the first place. Read the service manual for further details.

Good luck,
Sai.

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Toshiba 57H81, Looks 3D, with touch focus error. how do I fix this?


you need a convergence repair kit. The 50H71 convergence repair kit available at the following link also applies to the H81 models it contains both ICs and the feed resistors. They also send instructions on how to do the repair. Heres the link.
http://servicemanuals.vstore.ca/

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Typically this is a convergence problem and can be repair relatively easy. Refer to this video to determine if you truly have a convergence problem. Also make sure you use your TV's original remote to make this adjustment.

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My 57H81 won't converge, plus I get the "touch focus error" message. I could get manual convergence of blue, but not red. Plus, during touch focus the red would not move horizontally

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1 Answer

TOUCH FOCUS ERROR


The convergence IC`s need to be replaced and the related low ohm resistors need to be checked for proper value.

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