Question about Toshiba 57H84 57" Rear Projection HDTV-Ready Television

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Toshiba 57H84: problem description below...

My TV is three years old, Toshiba 57H84. The TV started just abruptly shutting off occasionally. The power light would blink, and we would have to unplug the TV to get it to come back on. Then, when we would plug it back in, the screen would be a bright blue for about two seconds, then the TV would cut off again.
I got online, being a technical-type, and looked for a solution. I found some ideas, and took the front of the TV off. To make a long story short, I adjusted the tube voltages manually, and the TV worked for a couple of days. Now, the blue tube is bright even when turned completely down. I turn it up, and something started popping and flashing inside right before it turned off again. I figured the tube was going out. But after seeing that the other tubes will shut off the TV when turned up, and after giving it some electrical thought, I realized that the tubes are probably fine. (except for whichever one is leaving the inch-wide yellow "hole" in the middle of the screen.) The box-type thing that all the tubes connect to with the "sparkplug wire" looking thick wire is probably bad, or the thing that THAT box is connected to. I think that if there is a voltage regulator of some sort, that it is malfunctioning.
OK, realizing that this is all coming from a non-TV repairman; what do you think is my problem? I can be reached at, or at 843-270-0086. Thanks in advance.

In His service,

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  • William Rayburn
    William Rayburn May 11, 2010

    At this point it could be damaged even further by turning up the G2 on the focus block, including but not limited too damaging the focus block itself... What I believe you may have had at first is an overvoltage shutdown - usually when a regulator, diode, resistor or any cobination thereof begin to fail and load the circuit too heavy causing shutdown..

    You might try replacing Q306 Part# 23085588 A Ta7590pg and put in a new focus block. Check F840 200ma Pico Fuse, Toshiba # 23144704, And Q840 Mip280 Standy Power Supply Smps Controller, Toshiba # 23906133... And let me know if it will power on following that...




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Posted on Jan 02, 2017

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SOURCE: toshiba 65hdx82

The STKs are common and if you have an experienced electronics tech around they can replace them for much less money but the tech must have advanced soldering and IC exchange experience.

The STK ics, two of them, can be purchased on line for around $20 to $40 each.

Partstore has two models available - one for around $40 and another for around $55.

The part number is STK392-110 and if you google you can find them for as little as $6/each but I don't recommend the cheap ones as they are not reliable.

It takes a good tech around 3 or 3 hours to take the old ones out and solder in the new ones. Also, it is likely one or two resistors are burnt and will need replacing as well.

Posted on Dec 18, 2007

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SOURCE: Toshiba 61H70 Weird Convergence Issue?

They may have gotten some cheap convergence ICs, thats a real possibility. I would recommend switching the two origional STK392-110 with some STK392-150 they will run alot cooler and last alot longer. Just use a good coating of heat sink compound on the back of the ICs. I will post a link where you can get top quality Convergence ICs and they provide free instalation instructions with pictures so you can do the job yourself in under an hour and save quite a bit of money. Heres the link.

Posted on May 22, 2008

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SOURCE: Thosiba TP61H95, when I power

Since you have sound if its not HV then its gotta be the deflection ICs and/or the HOT(horizontal output transistor). Its not gonna be very hard provided you know how to use a multimeter and know how to solder. Let me know if you think you can do it yourself so that I can tell where the ICs and the transistor are located so that you can replace them , along with the resistors that are faulty(we can test using the ohm-meter feature of the multimeter and the original value of resistance can be calculated from the color codes on them).

Posted on Jul 10, 2011

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