20 Most Recent ViewSonic N2750w 27 in. HD-Ready LCD Television - Page 6 Questions & Answers

I just did this last week, i had the same problem all you have to do is grab some speaker wire and wrap it arround the RCA's(around the metal or gold piece outside the RCA) that go to your voice AMP and then ground the speaker wire(the one you wraped the rca's with). this will work. NO Noise filter will work cus I tried it

Okay, start with being locked out. The master code should override so try 8025. If that is no good, try 0000.

Now, if neither work, and this one might solve both problems, unplug the phone for at least 8 hours. This should reset to factory settings, so again try 8025 or 0000 or 1234 even. It depends on the where that specific N2750w was manufactured.

Turning it off for the 8 hours may also fix the tv staying powered on. If not, you probably need a new power supply for the unti. If so, either deal with the issue or bring it to Best Buy or a repair shop, if it is no longer under warranty with Viewsonic. But I really think those codes would get you by. Again, if they don't work before you unplug it for 8 hours, try the codes again.

Happy Holidays!
EJ Kudelka

Look at the power supply first; look for burnt parts, bad capacitors, etc. Look for 5vdc, 12vdc, and 24dvc.
http://en.wikipedia.org/wiki/Capacitor_plague
If you do have the voltages then the problem can be the main controller board.
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=n2750w
Please post back what you find

www.sears.com parts dept....have make and model ready!
This should fix ya (they can ship part to you or your local store)

The class D sound amp circuits are bad, it is part of the main board, very expensive, this is a common problem with this model, I fixed two of them, usually after 30 minutes it will soud like motor boat.
http://www.shopjimmy.com/main-unit-jc278a61u-from-viewsonic-n2750w-2.htm

Look at the power supply, look for burnt parts, bad capacitors, etc. You must have at least standby 5vdc on one of the power supply output connectors.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find

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.

Bad capacitor 2200uf 25v 1000uf 16v if you see any capacitors that are puffed up on top they are Bad, Call Mats Electronics 1-800-628-1118

I think so unlock Parental Codes on most TV's you would go to where ever in the settings is asks to Remove Parental code. If they didnt really care hopefully the password would be generic like 0000

On the tv itself hold down channel up button while holding that press and hold the menu button . this will un lock it

Look at the 5vdc standby voltage section of the power supply, you MUST have his voltage first before going any further. You may be better off get the power supply here for $80.
http://www.shopjimmy.com/catalogsearch/result/index/?q=viewsonic+n2750w&limit=50

If you hold a flash light to the screen ,on an angle you should be able to see the picture in the background if its the backlight. Try lookin on ebay for the part or a site called shopjimmy.com.

Check the power supply first for bac capacitors (learn more here about bad capacitors: http://en.wikipedia.org/wiki/Capacitor_plague)
I had replaced capacitors in my, hopefully it did not cause damages to other circuits such as backlight inverter board.

It failed the self test during boot up, bad micro controller. You will need the main pcb assembly for it.

Did you ever figure this out? I have the same problem. Thanks for any help you can supply.

The problem is in the set. The remote sensor or system control is not "seeing" the remote commands.

Most likely you have a bad inverter which is part of the LCD panel. Have a repair shop check it out for you.

how old isw this set, get a flash light and point it at the screen look very carefully and see if you can see a pic if so then open it up you have a small pico fuse going to your lcd screen replace and that should fix it good luck

inverter board is failing causing shut down