Question about Toshiba 57HX81 57" Rear Projection Television

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I have ordered and recieved new stk ic chips for my toshiba projection tv. will be doing the repairs myself. was wondering what wattage do i need to use when desolering the old chips and soldering the new ones in? also is the anything else i need to get the ic chips up and running?

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You will need some heatsink compound, you should be able to find that at Radio Shack. I use a Weller 60-watt regulated iron, but an unregulated 25 -40 watt will do the job, but maybe not as fast. The biggest concern is your skill level, so you don't cook any lands off the PC board, and that you don't overheat the leads of the new chips. I've had some inferior parts that the leads literally just fell off of, without excessive heat. I hope that doesn't happen to you.
There are some low-value (1-2 ohm) resistors in the yoke return circuits. If the resistors are bad, they should show visible signs. If all goes right, the convergence should be very close before any adjustments.

Posted on Feb 03, 2010

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1 Answer

I have red convergance problem.. This is the second time I have replaced all diodes and the stk chips. they dont have any 110 stk chips so i am using 150 stk chips. I replaced all diods and now RK 62...


Alot of techs recommend using the higher wattage ICs to replace the stock ones, which is never a good idea since the resistors get stressed. Upgrading to the STK394-160 IC is the only upgrade Hitachi recommends but then the values of the resistors need to be changed since the stock resistors will not work with the upgraded ICs

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Location of convergence chips in Toshiba 57H81.


hello if you can use a soldering iron you shouldn't have any problems but you will need to test the resistor in front of the ic and the capacitors at either end of the ic ! the ic usually located to the right hand side of the tv behind the tuner board connected to metal frame called a heatsink 2 big black chip good luck

regards
shaun

Mar 27, 2010 | Toshiba 57H81 57" Rear Projection...

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65" rear pro. Convergence IC Repair


This is a common problem. Its called a convergence failure.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3D
  • Colors wont align
  • Video may look distorted
Problem #2 CRT Fluid has clouded over. Symtoms
  • Dull looking video
  • White looking video
  • Halos around objects
  • Red/Orange looking video

You can see some examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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I have a toshiba big screen tv we believe both convergents need to be replaced we do not have 300-365.00 to repair it . I know how to solder can I do it myself???? model#57H81


convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Oct 24, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

I have a toshiba TP55C81 projection TV. The red The red vertical adjustments stopped working. The adjustmnet knob in the control panel does not effect the adjustment and none of the vertical adjustmen


You need to replace the vertical STK convergence chip but I would recommend that you replace the horizontal chip at the same time as this is likely to fail soon.

The following relates to the repair I have recently carried out to my Toshibal 40WH08B rear projection TV but shuold be very similar to your model. Replace the STK chips with the same type on your model:

On the convergence board PB 9487 (the one with the 2 large heat sinks that the r, b & g guns plug into) you will see two STK392-110 ics connected to the large heat sinks. Replace both of these and readjust convergence in service mode if necessary.

I obtained the replacement ics from Charles Hyde & Sons Ltd (see link below). I ordered the general ics not the Toshiba ones as these are identical as far as I could see and they cost £17.19 each instead of £36.68 each.

http://www.chsinteractive.co.uk/search.html?query=stk392-110

You will need to desolder the heat sinks as well as the ics as access to the ic mount screws are obstructed by the conv.dig board (metal cased). Buy a good quality desolder pump if you dont have one.
One last thing I should mention. The white paste between the ics and the heatsink is silicon thermal compound. Without this the heatsinks will not take heat from the ics effectivly and the ics will burn out! I recommend that you clean all of the old paste off the heatsinks and apply new to the whole of the metal plates on the back of the ics before you screw them to the heatsinks. You can get the thermal compound and the desolder pump from the same supplier I recommended for the ics.

Let know if your are having any problems.

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1 Answer

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This is likely your convergence ICs(chips). If you can bump it then the ICs (chips) are still ok, it just needs resoldering.
my company charges $300-400 for the full repair (replacing ICs, full realignment plus cleaning)
if you can find a company that will resolder for you, it could cost $100-200 maybe. if you are a handy person with soldering skills, you could repair yourself. i can instruct if needed, but convergence IC soldering requires decent soldering skills. you will find the ICs on the largest heatsink in the tv. the part number starts with STK. if you replace them, check the resistors in front of them and replace accordingly. most toshiba will blow up to 3 fuses (f850, f851, f852)

Dec 08, 2008 | Televison & Video

1 Answer

STK IC CHIP 392-110


I made the same repair in a Toshiba 42h81 I replaced the STK 392-110 and after a lot of searching found the cheaper ones last 6 month or so be sure to use Sanyo IC's and replace the resistors with them when the IC's let go they take the resistors out I posted my repair On my page if it will help you dennisgm052.weebly.com

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the Convergence Ics are STK392-110 ICs you can get replacement Ics at the following link and they provide free instalation instructions.
http://servicemanuals.vstore.ca/

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