Question about Vizio P42HD Television

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Visio p42hd, no picture or sound. like it just wont switch on. No led lighting (yelow, green, red) on front panel, can't turn on via remote or push button front panel. There is a test switch on a board and when switched i get a nice blue screen. Checked all fuses (7) all good. Nothing seems to be blown. Large caps looking good visually no buldging. Secondary power supply has output voltabe on pins.May be good power supplys but may be bad main board??? Both the remote and front panel buttons send signal to somewhere to switch on TV (Main Board)?? Why no led lit?? Nice blue screen comes to life when test switch is moved to test position so there is power then.

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  • spinks02 Nov 03, 2010

    Yes i am qualified. I have a major in computer science and a minor in electronics. I have repaired board level circuits. I just have not taken apart a tv in a long time. It is a plasma and I need to learn about the newer technology. I do not have a manuel and I'm not familure with the new boards but I learn quick. I would also like to know more about the test switch. i was on ebay and seen th boards #2970041206 for sale. It appears that the front panel switch wires run to this board. My guess is that once the board receives a signal it then must switch on a relay to main power.

  • spinks02 Nov 03, 2010

    Thanks I'll look into getting the manules. Do you have any descriptions of the functions of the boards in these tv's. So for instance what do the following boards do: Y Sustainer Board, Z Sustainer Board, GRAPHIC PCB, Bottom Y-Driver, Y-DRIVER TOP, X-Sustainer Left XLBT, Logic Control Board etc. Im not a tv repair person but if I could understand what these boards are supposed to do then I would have a better idea of where to look.

  • spinks02 Nov 03, 2010

    Thanks for all your help. I now need to move forward with a service manule. But I might go ahead and order a main board for $40. and see if the problem is solved. Thanks for the description of the board functions, that helps me out with the diagnostics.

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  • 4,889 Answers

Yes it does sound like the mainboard. But we have to confirm. I will see if there is a service manual for this unit in my collection but do you think you can safely work on it? Have you worked on electronics before? The last thing I want is you hurting yourself trying to fix it. HV circuits are not to be messed with unless you know about them.

Posted on Nov 03, 2010

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  • eagle338
    eagle338 Nov 03, 2010

    You are right about the relay. That is "click" that you hear when you turn on the power, provided the power supply has not turned off due to some protection fault. As for the service manual I do not have one for this model but you can get it from the link below for 5$.
    http://www.s100-manuals.com/manualdetail...

  • eagle338
    eagle338 Nov 03, 2010

    Power/standby boards handle the power supply functions, X-sus , Y-sus boards produce the high voltages required to drive the display(discharge capacitors in tandem), driver boards perform the buffering functions, logic board handles the controls(remote control inputs and front panel controls along with the addressing functions (of the pixels) , Graphic PCB you mean main video/audio board?

  • eagle338
    eagle338 Nov 03, 2010

    Thank you for the accept. If you need any help with your daignostics feel free to ask. This thread will never expire

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