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Question about Toshiba 46H84 46" Rear Projection HDTV-Ready Television

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No picture, but red light on front comes on

The TV broke in a similar manner in Jan. of this year--no picture, but the red power led on the front came on. The TV repair place stated that the convergence board needed to be replaced, so I had it fixed for about $300. So now within the last month (and just out of the repair's warranty) it goes blank again. I assumed it was the same problem as before and wanted to same some momney. I did some research and found that I could replace the STKs for about $40 and a little soldering--I am not new to soldering. I found the same model STKs online and went ahead and replaced them, being very careful to mount the heatsinks properly, make good solder joints, and not apply too much heat to any of the STK leads. I put the TV back together and I find that that nothing is resolved--still no picture. So, my questions are: What else could be broken if I have no picture and the STKs have been replaced? Or is it more likely that I installed the STKs improperly. In my humble opinion I did some rather good soldering, so my hunch is that something else is broke. Thanks.

Posted by B.J. Zolp on

  • 2 more comments 
  • B.J. Zolp
    B.J. Zolp Jul 12, 2007

    Is it possible that other components on the convergence board are damaged? Would it be worth me testing those items out?

  • B.J. Zolp
    B.J. Zolp Jul 13, 2007

    Thanks for the advice. I will check my service manuals tomorrow to find the vertical output IC. But just looking at the board, I assume the vertical output IC is the only other IC on the board--TC40GGBP 0438HC. Everything else on the board are either resistors, transistors, caps, or inductors; besides the 2 STK ICs.

  • B.J. Zolp
    B.J. Zolp Jan 22, 2008

    I replaced the whole convergence board with a new one and the TV still displays the symptoms.

  • Anonymous Jul 09, 2008

    I had the same problem , took it in to be repaired it is the bulb or something. The part you need is # ( 23078431) but Toshiba no longer makes that parts. So I called Toshiba all they could say is sorry .



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If one your convergence IC's is bad then you will still see a picture but the colors will not line up, especially around the edges. I have never seen a Toshiba projection set completely lose the picture because of a defective convergence IC. If your vertical output IC has failed or cracked loose then that is exactly what you will see - no picture! The vertical output IC is usually on the same board as the convergence outputs which explains why it worked last time, even if the tech was not 100 percent accurate in knowing exactly what was wrong - he just changed everything. Resolder that vertical output IC and make sure it is getting power. If you still have no picture after that then have a qualified tech look at the set.

Posted on Jul 13, 2007


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