Question about ViewSonic VPW425 42 in. Plasma HDTV

1 Answer

Originally I had a problem with my Viewsonic VPW425 TV. The unit was not turning on. I just replaced the Power Supply board in the unit. Now it turns on, but just stays on for a few minutes, then I loose the picture. Was there an adjustment that I had to make? Please help. .

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  • aromim Sep 13, 2010

    I have two fuses that I need to replace. They are both ceramic but I am having a world of trouble finding where to get them. They are an:
    F8701 T6 3AH/250V
    F8702 T6 3AH/250V

    Do you know where I can get them?

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  • 666 Answers

No it sounds like you probably didnt need a new power supply but simply needed to check your fuses this error normally occurs when a fuse or capacitor has blown and will either be really cheap or really expensive to fix depending on which it is the fuse change should be possible on your own but running a diagnostic to find out which circuit has a blown unit would require some technical assistance and tools


hope this helps
Robb

Posted on Sep 11, 2010

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There is some missing output voltages from the power supply regulator board to your tv. Normally, these board are replaced as card basis. some of them are repairable too. You have to check this board first, to find whether it is repairable or not. If not replace it as card basis.
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Seem like the power supply hav blow off inside the unit.

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im not too familiar with viewsonic but it sounds like an ovrheating issue. i would monitor th power supply and the y sustain board. they seem to be the most common failures in plasma tvs. if you can tell me the panel model number inside the tv i may be able to assist you further...

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1 Answer

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The power supply board is dead.That the board where the power a/c cord go into it.Replaced the
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1 Answer

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You have probably already resolved this, however if your TV is 32" or smaller it likely has bad capacitors in the power supply. If you try it once more take note of: Does the red standby light still come on? If so, unplug the unit and either replace the capacitors in the power supply or purchase a new power supply from a Viewsonic service centre. Don't keep plugging it in and trying to get it to work in this condition or you'll completely blow the supply. If the standby light no longer comes on and the tv will no longer power up, the power supply board is toast. Get a new one and install it (they are pretty easy to install, unscrew the remove the back cover, remove the shield covering the boards, unplug two plugs going to the power board and remove the board. Install the new board and reassemble.

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Viewsonic normaly does not sell service manuals to non contracted servicers. You can call Viewsonic and see if they will sell you a service manual.

With the Pasma and LCD sets that we work on (we are not a Viewsonic rep), they are all supported from the manufacture for mainly board swap only, just like in a computer.

The circuit boards are mostly using SMD technology mounted and embeded in to multi layered circuit boards. Troubleshooting these boards is like trying to troubshoot computer boards. There is almost no supported component level service. In any case, you would also have problems to buy non generic type replacement components.

The service manuals do not always have detailed schematics of all the boards. The manual is more for modular assembly, specific types of service, and for doing the factory level alignments.


Good Luck!

Jerry G.




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1 Answer

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This website has many service manuals that you can download for a fee
www.ServiceManuals.Net
Good luck.

Nov 12, 2007 | ViewSonic VPW425 42 in. Plasma HDTV

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