Question about Panasonic Televison & Video

2 Answers

Replaced stk392-110 with stk392-150,Now have no power and the tv will not turn on.Had carefully checked the solder when replacing the amps.

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  • clemper Oct 13, 2010

    Prior to replacing the IC stk392-150 the tv was having convergence peoblems.The image was in 3D and I was not able the line up the cross bars.I installed the new ampsand made sure that the solder did not short any of the pins.But when i connected all the connectors nothing happened.I have the whole assembly with the PWBs out and checked all the resistors and they all seem to be fine except one R7053 which is reading 3.9 ohms. The value marking on it is completely faded.Also I have removed both the amps.Is it possible to power this unit and test it without installing it in the cabinet.Also do you have the schematics with the resistor values.The amp resistors are 120,82, and 2.2 ohms. Please advice.

  • clemper Oct 17, 2010

    I had alredy added more comments and never got a reply if the whole assembly can be checked if I have it outside.Also do you have the resistor values or a service manual for this tv.

  • clemper Oct 18, 2010

    I removed both the 392-150 amps and reconnected the TV.It powered on.Then I installed two new 392-110 and powered the TV on again.This time the tv turns on but there is a rattling sound and then the tv shuts off with all the colors diappearing into a small dot in the center of the screen.If I unplug it and reconnect it does the same thing.I do not know what the chattering sound is.

  • clemper Oct 19, 2010

    I had posted more comments yesterday and since I did not get a reply I am submitting it again.I removed the stk392-150 and powered the TV.It turned on and stayed on standby.Then I installed a new set of stk392-110 and powered it on.The tv turns on but it makes a kind of a rattling/sputtering sound and then turns off.When shutting off you see a kind of a colored wheel that vanished into a dot in the center of the screen. Seems it is kind of a convergence part issue.

  • clemper Oct 21, 2010

    I have a Panasonic Pt-53WX42F which was having convergence problems.The picture was in 3D and no adjustments helped to get the colors lined up.I replaced rhe STK392-110 with STK392-150 and that did not work since the tv would not power up and there was no audio or anything on the screen.Ihad checked all the convergence resistors and the newly soldered amps for any overflow of the solder.Since this did not work I removed the amps and repowered the tv which turned on and showed standby mode.Then I replaced it with STK392-110 and powered it on.The tv came on with no image but with horizontal lines and then it started making a kind of rattling sound and turned off with a kind of a color wheel diappearing into a dot on the screen.Everytime I disconnect and repower it, it does the same.

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  • Panasonic Master
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If you are seeing just a few horizontal lines then the vertical deflection unit isn't operational at full specs - the vertical deflection unit is uncomanded by the syncro stage or the voltage powering it is way too low.
The rattling is made by the power source that tries to shut down because it has detected a big short on one of it's output lines. The dot appears on the screen because the G1 tension on the tubes is way too low and it no longer blocks the tube .
Both these tensions are generated directly in the power source - you must check it, something is at fault there.

Posted on Oct 21, 2010

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  • Panasonic Master
  • 17,129 Answers

If there is no power supply then the Switch mode power suppy( SMPS) can be defective. Unless the secondary voltages reach the amin board the TV will not function.
So armed with a multimeter please check for the input to the SMPS and the voltages to the main board.
You must receive the +5 voltage to the microprocessor section so we can check further for the functioning off the mP IC.
Now this is critical to see that the controller works. So I recommend some tips to check the SMPS.
click on:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

To check your processor you must check on the oscillations of the crystal, the input/output logic.

If the processor works and still the main board is not functioning, recheck the newly mounted IC's. Check for track failures in the PCB, check for poor solder.

Now finally please indicate the fault of the set prior to your changing the IC's.


The advice/tip given is with the belief that you are competent. You must attempt to do it yourself only if you are technically/logically able, especially when dealing with delicate devices, damaging while trying to open, Probing electrical/electronic circuits with high voltage or delicate components. Since the advice given by me is with the inputs provided and not based on a visual inspection, there can be further reviews required in some cases.

Posted on Oct 11, 2010

  • Donald DCruz
    Donald DCruz Oct 17, 2010

    Sorry I had been off and could not comment. I suggest that you must replace back the older IC's and try one a t a time to ensure that you got a good one.
    Sorry I do not have manuals to provide.
    Hope you try this once again. Good luck.

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1 Answer

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The power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

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2 Answers

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1 Answer

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