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How to check the power supply may "cause by wrong ac voltage .red light at power panel swift showing red. .I turned on click on rellay..like protect. .thanks I help to find schematics diag.

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If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/...

Posted on Dec 13, 2016

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Pioneer PDP 5030 power supply problem

Ok here's how I manage solve the problem... Having the back removed opens the contacts on the interlock switch so I guess if it powers up in this state it senses the high voltages are exposed and for safety shuts down... After this the unit will not power up and the power led flashes red continuously as described before…
After some thought it occurred to me that there may not be a problem at all, just be a simple reset function for this condition… I managed to find an easy solution to this… Just call up the hidden engineer’s service menu – On 3rd generation Pioneer Plasmas it’s as follows > Power down the screen > Hold down the “Input” and “Vol +” buttons on the front > Power the screen up and the Service menu comes up on the screen > You don't need to change anything just simply power off and from then the screen should operate as normal…It did for me so I’m well happy now!!
I hope this information will help someone else one day – Good Luck!!…Rob UK…

Posted on Jan 04, 2008

SOURCE: Vizio P42HDTV Power on Diagnosis

Please check the U29 8 pin little surface mount mosfet it has this letters > FDS4935 > > In this part inputs 13.2 volts which is ok for the near 12 vdc but it > outputs 1.250 vdc i am 100% sure that this is all the problem > > check it out, and tell me if you´re agree with me > > On this output pin it feeds the audio Ic, the 7809 and the tuner side board > which needs de 12vdc too and its getting only the 5vdc part > > what do ya think?? > > Richard

Posted on Apr 13, 2008

Slinteriors
  • 8617 Answers

SOURCE: power up problem

i will need the model number of your set in order to help you with your problem. Please post the model number and I will try to help you out with the problem.

Posted on May 07, 2008

Coldcut
  • 1554 Answers

SOURCE: LG 42KK Power Supply Schematic Requested

you won't find any just ,

use a thermal probe or thermal gun as heat is likely the issue ,
if nothing else replace the main diode /rectifier and caps.
I find that if I replace the hottest items that usually the fix


if there is room for a small fan you will be doing them a great service and extend the life of the tv.

you may find some info on the power supply from one of these links they are generic enough
http://www.pacificdisplay.com/links.htm


Posted on Jun 10, 2008

Davetyke
  • 14 Answers

SOURCE: protron lcd tv getting no power

I can get a new replacement power supply for some internal power supply models. It's fairly easy to remove and replace. dave@thola.com

Posted on Mar 06, 2009

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Failure on one of the boards the power supply is servicing may be causing an over current relay to trip repeatedly.
Check PS voltages while the clicking is present to see if one of the outputs is unstable.

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Is power voltage going to the Panel screen?Can you measure that?
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The t.v powers on for just a second and clicks off. I can hear a click from the back and it recycles off/on over and over.


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The TV will not turn on. When I press the remote button or the TV button, it clicks like it will turn on, but the red light appears, not the green one.


Hello Peter sorry to say but your power supply board is faulty and needs to be replaced, the red light is indicating that your high voltage is out of sync or a component in the power supply circuit is causing this problem, call the manufacturer for the power supply circuit or let me know and i have a website where you can find the power supply, hope this helps thank you.

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Dead KDLW40A12U


The TV develops a low voltage which a simple microprocessor uses to turn the power supply on when you use the remote or TV power button. Sometimes sets will show a red power light when the TV is in stand-by mode which turns green when it turns on. If you don't have that and don't hear a click when you first plug in the TV, you probably have a power supply problem. If you had a power surge, it could have blown the AC fuse. Try replacing it with the exact same rated fuse and you might get lucky. If it blows again, it will need service.

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