Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42h81 replaced IC's now flashing red light and no picture

I have looked through your forum and found out that my IC's were causing problems to my television, the red convergence was wavy on one corner and looked like a 3d movie. I opened my tv up removed all the wires, except for those big red ones, and unsoldered the heatsink and ic's. I ordered some new stk392-110's, a solder wick and heat grease. I put back the heatsink and ic's, resoldered them, cleaned the area with alcohol and toothbrush to remove residue. connected everything and plugged it in, I hear one click when I plug it in and a second when I turn it on. the red light shows, no picture and starts blinking continuously, no pattern, just continuously. How to fix this? Was it my solder job? this was my first time soldering, but I looked online on how to do it. was it a fuse? A jumper cable? any help would be appreciated. Also where could you get a free service manual on 42h81 tv?

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  • fox1990 Feb 05, 2008

    how do you test the resistors? and how do you which ones? I have a multi-meter?

  • fox1990 Feb 05, 2008

    everything was soldered, I did notice two solder bridges, and I fixed them, but still the same thing. how do you check resistors? I have a multimeter. and at what ohm should all the soldered pins be?

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  • Master
  • 4,402 Answers

First of all take the board out and back sure all the pins are soldered and that one didnt get pushed up out of the way.
then check for solder bridges where you would have solder more than one pin together.
then check the resisters in the circuit that they are all good and then check to make sure everything is plugged in correctly

Posted on Feb 04, 2008

  • Cary Farah
    Cary Farah Feb 06, 2008

    there should be 6 larger resisters lift one side of the resister and they should be 3.9 ohms or less (1Watt axial lead fusible resistors:
    1.5, 1.8, 2.2, 2.7, 3.3, 3.9 Ohms. )

  • Cary Farah
    Cary Farah Feb 06, 2008

    Im hoping you did not short something together and blow a fuse when you had the solder bridge, anyways if the above doesn't work you might want to send the board in and have it checked out ptscorp.com.

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1 Answer

I recently got a Toshiba 42H81 that someone didnt want anymore and the problom is that when you turn it on no picture or sound comes on just the red light keeps flashing, what could this be and how much...


hello the led is flashing this is giving you an error code count how many times it flashes then do a search on google it may tell the you the fault good luck

regards
shaun

Jul 04, 2010 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42H81


Won't be any cheaper if you go looking and you'll probably get sold some chinese knock-offs anyway... It sounds like you'll need to replace the convergence amps, both STK392-110 Sanyo originals. Also the tech will test the yoke return path circuits and the resistors therein... Likely s/he'll find that one or more has change slightly in value and change those as well for a more reliable repair...
Hope this helps!
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

Sep 20, 2008 | Toshiba 42H81 42" Rear Projection...

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STK392-110 's = replace with Toshiba or Sanyo quality only..
What was the location & value of the resistor ?
An IC, if shorted internally,can prevent the tv from powering up..
Re-check soldered in 5 amp micro fuses F850,851,852,etc
Fix it ! ..............................T.

Aug 28, 2008 | Toshiba 42H81 42" Rear Projection...

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Good Day, harri1234;
Sounds like a convergence problem.
Convergence Output IC Failure
Corrective Action: Replace the defective Convergence Output IC Part Number 23905094 (STK392-110) using the revised “T” version IC Part Number 23135090 (STK392-110T). When Convergence Output failure is
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Good Luck, Big Irish.

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try resoldering the vertical output IC.That may help the problem

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This repair is for technical skilled only.....
1) Pull chassis
2)Replace open fuse(s)
3)Replace Convergence IC"s
4)Solder specific bad connects
5)Reassemble,test

Please read my previous posts concerning convergence repairs.
Or provide Make,model,age and symptom.............T.

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Also,check micro fuses F851,F852,etc.
and with a good digital meter, check resistors feeding B+ to
convergence circuit.
I have been using Stk392-110T made by Toshiba with no re-calls.Hitachi also has an upgrade IC.
And be sure to check your soldering of IC pins--good connect,
with no short.....T.

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The symptom suggest a faulty converge ic.you need to replace that ic ( stk392-110 ).

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