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Panasonic TX68PS20A CRT TV has no picture or sound

Panasonic TX68PS20A
The red light on the power button at the front comes on when you turn the power on at the wall. The red power light turns to green when you press the channel change buttons and stays green for about 30 seconds but then returns to red. No sound or picture at any time.
Any suggestions as to troubleshooting and repairing.

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  • mduke3 May 22, 2009

    Panasonic TX68PS20A CRT TV has no picture or sound" Start off with red light. When switch is pressed, it turns to green and stays that way for 30 seconds then goes back to red. No picture or sound. Please help

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6 Suggested Answers

techman
  • 3130 Answers

SOURCE: TV turns itself off after a few seconds, no picture at all

Sounds like the typical Flyback and shorted horizontal output transistor. Problem is the transformer is NO Longer Available

Posted on Sep 14, 2006

  • 2 Answers

SOURCE: TV suddenly doesn't respond to Sony remote & power button on Satellite remote.

I am having the same problem with the "initial setup" screen flashing repeatedly/ intermittently. It's not a problem with the remote. In the research I have done online, it seems as though this is a common/known problem with the Wegas that will require a service visit. Apparently the problem is a defective receiver chip. The best thread I found is at: http://www.agoraquest.com/viewtopic.php?topic=15393&forum=34&start=0&select_page_number=1 I've seen some speculation that it is caused by windex or cleaning fluid dripping down when the screen is cleaned and corroding one of the internal components. That's not applicable in my case, since I always just clean the screen with a microfiber dusting cloth. So, I guess I will be calling a repairman and spending $$$ to fix as it is now flashing up so often as to be unwatchable. Ridiculous, I think, given that my TV is only 3 years old!!

Posted on Jan 11, 2007

  • 52 Answers

SOURCE: mAGNAVOX mODEL 27ms3404/17 shuts down

first place to start on this chasss is with a known failure in the horizontal circuit. there is a capacitor 2455 and 2 transistors locations 7461 and 7463 that have caused a wide variety of failures. i would recommend replacing these components before proceeding as they could be the whole of the problem.

Posted on Aug 20, 2008

  • 1 Answer

SOURCE: Timer/Standby light blinks but no picture or sound when power button is pressed.

I'm having the same problem. My stand-by light blinks 3 times though. The tv clicks as if it is going to turn on, but it never does. Is there a simple solution to this problem?

Posted on Oct 28, 2008

ginko
  • 19396 Answers

SOURCE: Standby Indicator flashing SONY KD-32NX100U

If the TV goes in standby, then it is in protection mode.

Ensure also that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem on DVD with no receiver box
connected.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible causes.

1Theinternal circuits are jammed because of electrostaticcharges accumulating on capacitors, or because of a wrong voltage readby the main chip on your monitor controller board. this started theprotection circuit.

2 The protection circuit detected a wrongvoltage or abroken contact, identified an internal fault and kicked in, starting the flashing light.

If you are in situation one, then the TV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |


On LCD Payparticular attention at inverter and power board, power board can beinspected looking for bulged or leaking capacitors, then tested with amultimeter. The inverter is more difficult to test , there is need toread voltages, should be done by a tech. Also the LCD controller board can cause same problem

On Plasma, test Sustain (Ysus/Zsus) / Buffer boards , cables to plasma, digital board and power board.

On Rear Projection : check lamp, lamp ballast, power board, and convergence.

On CRT TVs, check ballast , flyback transformer, CRT, Tuner, Convergence.

Posted on May 05, 2009

  • 1 Answer

SOURCE: Crt TV color starts out green-blue and sometimes

Hi,

Thanks, I picked up a hint about Degaussing on your site and it worked perfectly

Greg



































Posted on Dec 05, 2009

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