Question about Toshiba 55H70 55" Rear Projection Television

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Convergence ICs Hey thanks for responding so fast. I have all ready replaced both last week which stopped the set from turning off and the red pwr light blinking. Now I just need help to understand what controls the green alignment. This problem started after the set would turn off & the blinking red pwr light. I was watching it tonight and it is only in the center of the screen that the green is stretched to the upper and lower limits of the screen. Would you know what if any adjustments can be made to align the green? I assume the green's alignment is controlled by the circuitry on the board, not by the remote (only red & blue). Can you help?

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The green is half controlled by half of each of the convergence Ics meaning green horizontal is controled along with the red and green vertcal is controlled along with the blue Ics. So if you have replaced both Convergencs ICs the problem is most likely a resistor that is in the green circuit. You will need a schematic to locate which resistors are in the green vertical and horizontal convergence circuit

Posted on Jun 07, 2008

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1 Answer

My panasonic rear projection tv does not turn on the red light blinks 3 times


Hi,
3 times red light blinking indicates that tv got problem of convergence output ICs failure and need to replace two big black ICs (convergence output) to solve this problem.
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Hello saduchan,

I think that your ICs are ok, What you need to perform is what is called dynamic convergence, This involves using the internal convergence controls to align the outer edges of the screen. I am assuming that the center of the screen is ok? it's just the edges which are misaligned, right? Now for the bad news, this task is not easy in fact the job takes a pro about 6 to 12 hours to do it right. I think you should have a qualified TV technician attempt the static convergence setup followed by the dynamic convergence setup.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

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1 Answer

Help


It sounds as if your convergence ICs have failed again,However if you didnt replace the convergence resistors with the ICs that is most likely the cause of early IC failure. There is a quick test to determine if the ICs have failed. Remove the front speaker panel and access panel up front, and you will see the convergence panel with the two black heatsinks. Directly in front of those heatsinks are three wire clips that are for the convergence yokes, Unplug those three wire plugs and try turning on your set. If it comes on the ICs have failed, and the ICs and resistors should be replaced as a kit. You can get the repair kit for the JVC rear projections at the following link with free instructions. Heres the link.
http://servicemanuals.vstore.ca/
Let me know if you need more information.

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1 Answer

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If the red isnt responding via the remote you will need to replace the STK392-110 Ics as the service menu adjustment will not correct it 100% due to the IC being faulty and the red and half the green is controlled by one IC and the blue and other half of green is controlled by the second IC so without changing both ICs the set will progressively get worse. Both ICs are stk392-110. You can get replacements at the following link along with instalation instructions
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1 Answer

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replace the convergence ICs. I can post a link where you can get the ICs with free instructions on how to change the ICs yourself. Its an easy repair takes less than an hour from beginning to end.

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Confirmed Hitachi subs all STK392-110,120 and 150 to
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..................T.

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