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LCD panel not displaying screen

roger

Penultimate Amazing
roger
Joined
May 22, 2002
Messages
11,466
I just got a new LCD panel (NEC LCD1765) and it worked fine last night. This morning when I booted the computer there is no image on the screen. If I turn the power off then on then I do get an image - for half a second - then the screen turns black again.

I hooked up my old monitor to prove I the video card is giving a signal, changed the resolution/refresh rate, etc, and I am still getting the same behavior.

Any ideas?
 
That's the second LCD screen problem here. I get the feeling they are churning them out as fast as they can, without regard for quality control. I will wait a bit longer before I buy one. Most of them don't even guarantee that all the cells will work. That is, if you have one permanently on cell, which drives you dotty, that is not counted as a faulty monitor.
 
One possibility is that the video adapter's driver is confused, and it's sending all of its output to the analog instead of DVI port... if it's configured that way.

A source of intermittent trouble for me is that my 1920x1200 240T doesn't "oficially" support 1920x1200 in DVI mode, but will display it with some gentle coercion. Ocasionally, it "forgets", and ends up in another mode, and I end up having to "remind" it what to do. On top of this, I have to especially configure Linux to "suggest" it go into an appropriate mode to be displayed.
 
Can you get the on-board monitor setup controls displayed OK? The ones that change the screen sizes, colour temperature settings and such like.

If you can, you have a working display so the problem is between PC and monitor and how they are (not) talking, as evildave describes. If no setup display, it's busted - replace in total under warranty ASAP, no fool around.

I understand there have been a rash of LCD monitors with power supply problems... Don't quote me.
 
Have you tried booting into safemode? When you do let me know if the LCD panel displays an image or not? If it does, it's your video card driver/settings.
 
Zep said:
Can you get the on-board monitor setup controls displayed OK? The ones that change the screen sizes, colour temperature settings and such like.

If you can, you have a working display so the problem is between PC and monitor and how they are (not) talking, as evildave describes. If no setup display, it's busted - replace in total under warranty ASAP, no fool around.

I understand there have been a rash of LCD monitors with power supply problems... Don't quote me.
Click to expand...

No, the setup menu does not show up.

I thought that I had read *somewhere* that if you don't follow an exact power-up power-down sequence with your PC and screen the screen gets confused and goes into sleep mode. Of course, I cannot find that reference now. It seemed like it might apply given that I _can_ get an image for 1/2 second each time I turn the power on.

another person asked about safe-mode: no, I didn't try that, but I did reset the down to low res low colors. I realize it is not the same, so I will try that tonight.

Dave commented about analog vs DVI. This monitor only has an analog input, and my card only has analog output.

I will try the safe mode boot, but I'll probably just pack the thing up and bring it back to the store. It's not worth the frustration to try dealing w/ this.
 
follow up, and wrap up:

I just received an email from NEC where I carefully described the problem. Their answer: "What you describe sounds like a faulty backlight control board, called an inverter board. " and goes on to suggest returning it to the store or sending it in for service. I think I'll return it to the store!
 
I used to regard NEC as one of the 'good' Japanese brands, as distinct from Sanyo or Teac. No more. Their last VCR I bought was a pile of $$*$. In summer, the heat from the power supply was incredible. The picture quality was lousy.

I was glad when it finally broke down after only a couple of years.

I now own a Sharp VCR, and the difference is incredible. Much higher quality and picture.

NEC joins my list of brands to avoid, such as HP, Sanyo, Teac, etc.
 
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