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Panasonic tv modle CT36HL44J NO SOUNS NO PICTURE

Found Q551 short on D board, power supply to horizontal circuit checks OK
Q556 checks OK, horizontal drive signal to Q551 checks OK

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  • ps051 Feb 06, 2008

    no that is't the problem checked other suggestions and all are OK any other ideas?



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Obviously a power supply fault I think, you might need a new
LINE OUTPUT TRANSFORMER ( if everything checks out o.k. in the power supply circuitry)

Posted on Feb 06, 2008


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You're discussing about the 'supply HUM' I assumes. Check all the external connection to TV inputs for firmness first. If all are found OK, check by replacing all the filter capacitors at its main power supply regulator board. In fact, replace the power supply board as card basis will be the best. For more information go to

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What is cost of yoke for panasonic ct tv?

You're discussing about the width problem to picture. If yoke have a short in between its wingdings [even a single winding short], will cause the failure of horizontal output transistor. As per you report here, the set has a raster, but problem is with the picture width.
There possibliliites for this fault are.
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1990 panasonic tv model# CTM-2783S won't turn on

the tv need for servicing, the cause is either bad regulator transistor in the power supply section or shorted horizontal output transistor. that is why the main circuit board doesn't get to turn on. to do the repair just ensure you have knowledge in repairing tv.

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I have a panasonic 56 that the red light stays solid red for five seconds, then blinks five times when turned on. No pic, no sound.

The 5 blinks on a Panasonic projection television set is usually a problem in the power supply to the high voltage circuits.

You should be able to get a local service center to repair this at your house for between $350.00 - $450.00.

If you want to repair this set yourself, I have some instructions below that will be a help to you.
***** NOTE : You can get electrocuted and be hurt or cause death . You have been warned, be very careful when repairing any electronics. ****

If you are handy with a DVM you can check a couple of things with the power off and the set unplugged.

Check the Horizontal Output Transistor (HOT) Q551 for shorts. You may have to remove it from the circuit to test it completely. Also, check the Damper Diode and the horizontal drive transformer T501, this transformer can have ring cracks around the legs and cause the HOT to short.

The next step would be to check to see if you have 140 VDC on the collector of the HOT. If you don’t then you will need to start trouble shooting to find out where the 140 VDC was lost.

This can be a difficult repair, so I would suggest that you call a reputable service center to come and check out your set.

I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.

Thanks for using FixYa

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1 Answer

TV suddenly turned off and won't turn on for more than nSec.

Hello kd6aaj, You are on the right track, a vertical line usually means that you lost horizontal deflection which is supplied by the horizontal/High voltage section.The thing that puzzles me is that you did not lose high voltage. Let me explain. In modern TVs the horizontal section uses scan rectification or a process similar to a switching power supply to convert a lower voltage tapped off of the hoizontal/HV section to provide B+ for the rest of the television. So if you lose your Horizontal voltage you lose your B+ also. So you will never see the vertical line because you low voltage power supply if off also. Now I think your Q571 (H-Out), Q572 (H-Drive), Q551 and/or Q552 (H-Control) might be good. However check them anyway. I would also advise you to check your yoke transformer for an open or shorted winding. This would cause you to lose deflection without losing high voltage. You are definatly in the right section just add the deflection section to your scope of troubleshooting.

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You might have a short causing the set not to start. Probably in the horizontal/high voltage circuit. The buzzing sound that you're hearing is the power supply overloaded. Stargazer

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The click sound tells us that the microprocessor circuit is working and can be eliminated. The horizontal is the number one suspect. It could be shorted. If it is, then, the high voltage transformer or the focus block become a suspect as well. The voltages on the secondary of the power supply is the next place to check. If they are all there, then, you can rule out the power supply. If the voltages are missing, then, the regulator circuit is where the problem is. If only one voltage is missing, then, the the secondary has an issue and the circuit it supplies probably has a short. Good Luck

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1 Answer

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You have an intermittant vertical sweep circuit! It could be the vertical out put IC solder connections on the printed circuit board, or maybe the IC itself has poor connections between the IC and the contact legs that mount the IC, or another componet in the vertical sweep circuit. If you know how to solder and unsolder, work on printed circuit boards, then you shoul have no problem replacing the vertical sweep circuit. Good Luck

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