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tymiller
10-27-2009, 01:32 AM
I have a client's Dell Latitude D620 Laptop. When you turn it on the BIOS loading screen flashes for a second, discolored, on the LCD screen, then the screen turns black. I hooked up an external monitor, and it works fine.

I have checked all cabling.

Does this seem like an LCD issue or motherboard?

Thanks.
ComputerClinic
10-27-2009, 01:46 AM
Sounds like an LCD or cable problem to me.
Graystar
10-27-2009, 01:52 AM
Did you try shining a light on the screen to see if the image is there but is not back lit?
tymiller
10-27-2009, 02:22 AM
Did you try shining a light on the screen to see if the image is there but is not back lit?

Yea, nothing is coming up.
trapped
10-27-2009, 02:41 AM
It's probably either the inverter or backlight. I just ordered a tester, http://www.lcdparts.net/LST01.aspx that I'm hoping will help to narrow these things down. I have a system in right now that I thought for sure was a backlight (you could see the screen if you shined a light on it). Replaced the backlight and still nothing. I plugged the backlight in to the invertor on one of my shop laptops and it worked so I had to order an inverter.
NickCat11
10-27-2009, 08:32 AM
It's probably either the inverter or backlight.

+1, last time I had an issue like this it was the inverter...
Tweak
10-28-2009, 02:56 AM
It's probably either the inverter or backlight. I just ordered a tester, http://www.lcdparts.net/LST01.aspx that I'm hoping will help to narrow these things down. I have a system in right now that I thought for sure was a backlight (you could see the screen if you shined a light on it). Replaced the backlight and still nothing. I plugged the backlight in to the invertor on one of my shop laptops and it worked so I had to order an inverter.


Cool tester but you know using a $5-10 cathode you can make one that does pretty much the same thing, saves $100 bucks. The small blue piece I am referring to in this pic in case someone didn't know what I am referring to here.
http://www.centsiblelighting.com/images/cold-cathode-polycarb-new.gif
:cool:
trapped
10-28-2009, 03:11 AM
Just got it today. It's a nice package and it works, so I'm okay with spending a couple of bucks on it.
tymiller
10-29-2009, 05:20 AM
So, I replaced the LCD and the Inverter. It came on and went off and sounded like something shorted out. Turned it back on, and stuff was on the screen but no backlight. Then I couldn't even see that.

Any ideas? Maybe something on the mobo is shorting out? Im going to try and get my client to just replace the machine.
trapped
10-29-2009, 05:30 AM
That sounds pretty strange. I have been doing a lot of backlights and inverters lately and I haven't seen anything like that. One thing I did to test the backlights before I got my fancy overpriced tester is to plug them into an inverter on a shop laptop and see if it comes on. That would at least tell you if the new screen was good. If that works and it is a new inverter I guess it could be something with the mobo.