Question about ViewSonic N2750w 27 in. HD-Ready LCD Television

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LCDTV turns itself on and off

My tv is less than 2 yrs old. One day it just turned itself on. While i was looking for the remote it shut itself off. It kept turning itself on and off. I took the batteries out of the remote and called Viewsonic. They told me to leave unplugged and off for 8 hrs to restore factory defaults. No change. I called a tv repair shop for estimates. They said it would be $350 and was a problem with the power supply. Seems expensive for a $650 tv. Does this sound accurate and is it something I can fix myself?

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Re: LCDTV turns itself on and off

I have the same problem and did as suggested by Mergatroid. I found a capacitor that needs replacing but the damage is were the specification information is located.
I found a shematic for the Viewsonic n2750w but the part numbering does not match my unit. Hoe can I find the specs for this cap.

Posted on Dec 08, 2009

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Re: LCDTV turns itself on and off

You could order a power supply yourself and install it, but if the tech on the phone was wrong it would cost you a lot. Better to at least inspect it yourself.
If you are not familiar with electronics it could be tough to pin down the fault. Over-the-phone diagnoses are really only 50"50.

It COULD be any of the following:

Power Board
Main Board
Control Board
Control Board Wiring Harness
IR Receiver Board and or harness.

Visually inspect the power board for any capacitors that are vented or have shrunk cases on them. Check it for brown spots on the board itself. If there are brown spots you may have an overheating component. If it's s discrete component like a resistoror diode you can replace it. If it's an IC, you may have trouble finding it and might end up replacing the whole supply.

On the main board you can check all the connectors to make sure they are plugged in all the way. Make sure there are no overheating components.

On either of these boards, if you find dark brown spots you might want to consider replacing that board.

You can replace any bad capacitors you find easy enough.

Our shop would charge $75 labour and the cost of the part for a repair like this. A few hundred dollars for a circuit board is not unusual.

Posted on Feb 14, 2008

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