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Th42phd8wk panasonic monitor, green power light on (no blinking) but no pic at all, screen not lighting at all

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  • Phil Sciacca Oct 14, 2008

    I am a technician, but have not had experience with plasma units as I closed my repair business down a few years ago, this unit is mine and if I could get some help in terms of whether this is a common fault or not, or be pointed to the right direction I would appreciate it.

  • Phil Sciacca Oct 14, 2008

    I did some checking around the supply and all seems well unless I missed a rail, I also input a video and audio signal, there is no audio output, so it seems that the fault is not anything to do with the screen or screen supply. I can only imagine there is a rail down supplying the processing section, does anyone have a schematic for the power supply? and maybe a block diagram for the set?

  • Phil Sciacca Oct 14, 2008

    Thanks for your reply but no, there is no image at all, the screen is black, but also there is no audio.

  • Phil Sciacca Oct 14, 2008

    If an IC has failed I would assume these units would not be board level repairs and the board would have to be replaced? and if that is the case are they factory set or would there be adjustments to be carried out on the new board?

  • Phil Sciacca Oct 14, 2008

    Nio Charcois, the unit is not a projection set, I am familiar with those and am able to set the convergence, this is a plasma monitor Panasonic model th42phd8wk

  • Phil Sciacca Oct 14, 2008

    Thanks Dan I will do that

    Regards

    Phil

  • Phil Sciacca Oct 14, 2008

    Dan it seems that the 5v rail is down to 3.26v, I will have to obtain a curcuit of the processor circuitry to trace the 5v rail to the supply and check the processor clock, the processor itself is running cool so I don't believe it's dragging the voltage down, I also had a close look at the pcb's this one and the supply for dry joints as this set runs for 18hrs a day 7 days a week, if you are able to find anything in the meantime I appreciate it. Thank You.

    Phil

  • Phil Sciacca May 17, 2009

    The fault turned out to be two boards, the "D" Board and the "J" board, all is well now.
    Thanks for those who tried to help. Phil

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If you get nothing other than the green light, there is a fairly major fault. If the 5V line is good, look for the micro and see of the clock is running. This sounds like a logic fault that is not allowing anything to start up. I'll look up the model tonight and see if there are any common faults, but update this if you find anything with the clock.

Thanks,
Dan

Posted on Oct 14, 2008

  • ABRsvcs Oct 14, 2008

    With the voltage that low, the CPU won't work properly. Look for a defective filter cap on the 5V line. It is possible that the supply is being pulled down by a defective IC as well. Look for an op-amp chip in the audio section.



    Dan

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Its a common problem of proj. tv and it must be the convergence board of it cause the problem. i read many of tv problems and thats the number 1 problem of it. if your not so sure better to send it to technician to change or replace some parts of it. or use your warranty if it has.


CHARCOIS

Posted on Oct 14, 2008

  • Charris Suaybaguio
    Charris Suaybaguio Oct 14, 2008

    try this one sir various types of boards.



    http://www.shopjimmy.com/searchparts.cfm...



    by the way do at your own risk.



    CHARCOIS

  • Charris Suaybaguio
    Charris Suaybaguio Oct 14, 2008

    i cant see a model with something like that and i think the model of yours is Th42phd8Uk. ive search and theres no result of the model what youve wrote. im talking Th42phd8wk model. thank you for using fixya.



    CHARCOIS

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If you can see a very faint image, then it could be the inverter that went bad. It drives the backlight.

Posted on Oct 14, 2008

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May be the picture tube has got a fault in it ....
or it could be anything in between
u being a technician caould just check for open circuit
thats all i can say..
check the pins in side
or u could get proffesional help...

Posted on Oct 14, 2008

  • Varun Kumar
    Varun Kumar Oct 14, 2008

    @phelly


    the power supply is working fine as the green led is glowing....

    the connections are also good...(u checked it )
    i think the problem is with the board on ur moniter may some IC has blown up.....


  • Varun Kumar
    Varun Kumar Oct 15, 2008

    @phil

    they are factory set

    and u would have to send them to the factory............. the IC wil re replaced and sent back to u


    i guess it can not be a board problem otherwise one would certainly have found the fault.....


    i would suggest u to send it to the factory or some other authorised service center


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  • 81 Answers

Hi.

This is an internal hardware problem and needs to be checked by a professional.
Take the monitor to a service station to get it checked.

Regards
Faraz

Posted on Oct 14, 2008

  • Faraz Zama Oct 14, 2008

    Hi.

    I searched the net for your problem and found it common.
    But i couldn't find solution for your problem on any of the online forums.
    Sorry but we don't have a solution for your problem.
    I advise you to get it checked by an expert as it is a hardware fault.

    Thank you for using Fixya.

    Regards
    Faraz



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