Question about Toshiba 50H82 50" Rear Projection Television

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Problems after convergance IC fix

I have a Toshiba 50H82 and ran into the convergance issue. I replaced the convergance ICs with stk394-160 but did not change any resistors.

When I buttoned everything up and powered on I had the following issues.
1) Still poor picture (as expected)
2) No Sound
3) Only buttons on front panel that work are power, Touch Focus, TV/Video and channel up.
4) Remote does not work.

The Menu & volume button may work, but not sure because when using TV/Video the inputs will change but the typical GUI doesn't come up. So with no sound and no way to see what menu is doing they may actually be working ... it's just an issue with the GUI not coming up.

Touch focus completes operation without an error message, so I took that as a good sign. But I need to get into service mode, but can't do that without the remote.

I have checked fuses 850, 851, and 852. All good. The resistors under the ICs appear to be fine also.

Any suggestions on what to try next?

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  • Zach Carroll Apr 17, 2009

    Thanks tviceman -

    Yes, the tv was competely working before I went in, with exception of convergance problem.

    You are correct, the OSD will not show up. So, no channel numbers, no volume indicator, and no OSD.

    When selecting ANT input there is white noise on screen. When selecting Color Stream input I get a picture, although a poor one.

    I would like to get to the manual convergance in service mode, but I can't get the remote to operate at all (TV/Video, Channel Up on remote will not work either).

  • Zach Carroll Apr 17, 2009

    Sounds like a good starting point. Is the microprocessor you mentioned QA01?

    There are two OSD pins on the QA01 but they are both not connected in the schematic. There is a H_Sync, Sync_AV1, and Sync_VCD.

    Do you know which pin on the processor ties back to the flyback Xfmr?

  • Anonymous Apr 22, 2009

    las letras e imagenes se notan sombreadas en los bordes de otro color parece convergencia cuando apreto el boton toch focus s ejecutan dos lineas de barrido rojas despues sale en pantalla touch focos fallo agradeceria mucho su ayuda


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Try not to mix areas in the tv chasing several problems.

  1. Lets get back: i hope the tv was doing fine before to start digging into it ( was it?) Was the tv complete tested before to make sure the buttons were working all and the audio was there. I mean each part of your tv has different solutions:
Think you have an animal with several heads now:
  • the buttons in the panel (some working is good! some others can be replace and there it go all panel works)
  • audio mute (maybe no signal and automatic mute is there. or maybe really audio is damaged. Leave it at the end is another area.
  • Touch focus is the the program controlling convergence digitally talking. If the tv is not yet fix with the amplifiers then the problem still landed in another area not in the digital control.
Finally Start over! Get into de convergence and get your three tubes at least close to convergence (forget auto focus now) three screens together or almost but three rectangules with white noise. No having GUI you mean OSD (i gess) (on screen display) channels appearing when you push that button or audio level line or menu letters (several buttons have to be touch to make sure of there is not OSD.

if the tv has not white noise the screens are without convergence. you are digging in a set with maybe 5 problems the three you told me plus the other posibilities im gessing and i hope you don't have. So slow down with the repair and try step by step. bye now.

Posted on Apr 17, 2009

  • jose martinez Apr 17, 2009

    The OSD problem is related to a resistor blown or different value. This line inicially comes from the flyback (the processor needs the last peak of horizontal trace to allow OSD explore following the erase pulse. I've seen the two scenarios, is just this pulse cannot go into the OSD pin in microprocessor (control) and changing these components and bang. The other bad scenario: if you have the pulse but micro is already out at least this pin, (you tell me you can get some switching (video 1 etc) is good answer to believe the micro can be ok..

    yes, you need a series of steps into the remote control to get convergence to software level.

    and finally if the remote send some commands (you) and the tv answer those keys at least one, thats' great! Look for another original remote control (needed to adjust convergence) I'll go remote control.


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