NEC LCD monitor worth fixing?

Question

I have a 2-year old 17" NEC LCD Monitor (LCD1735NXM), which has developed a faint buzzing sound, along with the screen going completely pink intermittently. When I tap on the case, the sound changes slightly, and the screen goes back to normal for a time.

I have an electrical background, but before opening the monitor, I thought of getting some ideas whether this sounds like a bad soldering connection, which may be fixable, or whether this could be the sign of something else, and not worth fixing. Thanks for any feedback / experience someone may have with these monitors. Ken

Charles Schuler · Accepted Answer

With a background, you should be able to work on it. Tap on local areas once it is open. Does tapping ever cause the symptom? If it does, it is going to be a lot easier to find the area of interest.

Look closely at all connectors and sockets once it is open. Tap them and wiggle them.

Also, flexing circuit boards with an insulated tool is a good way to find intermittents. Cold spray is also used, but I doubt it will be useful in your situation.

PeterD · Answer

IMHO, probably a bad wire on a connector. I'd pull it apart and checkthe connectors (the VGA input) wiring first. The buzzing may be the backlight inverter. I'd guess it is notrelated.

James Sweet · Answer

Sounds like the backlight tube is bad. The mercury depletes with age and you can be left with a dim pink screen. This also changes the electrical characteristics of the lamp which may result in the inverter buzzing.

hrhofmann · Answer

But tapping would not change the backlight tube mercury or anythingelse within the backlight.  Sounds like the previous posters were onthe right track.H. R. (Bob) Hofmann

James Sweet · Answer

Oops, I missed that part. Yeah look at the inverter if it looks like the backlight is going pink, otherwise look for signs of cracked solder joints or loose connectors.

NEC LCD monitor worth fixing?

Join the Discussion

Didn't find your answer?