Someone brought me a Dell Inspiron 1545 laptop with a broken LCD. I ordered a new display with LED backlight. I installed the LCD, but when I powered up the laptop, it wouldn't work. I don't mean it wouldn't light up, it didn't work at all. Connecting it by the VGA port shows the video card is good. I tried the display on another laptop and other displays on this one with the same results. The new display is good, and no display will work on the Dell. I reseated the connectors on the video data cable with no joy and then repaced it with a new one. Still, it refuses to work. Setting the computer bios to default didn't help either. I never tried it before I replaced the LCD but the owner said it worked fine except for the broken screen. I don't know what else to try. Does anybody have an idea?
As this laptop is not functioning with any screen that you connect it sounds like there is another problem. Have you tested the old screen to see if it actually was dead?
Have you tried to get the diagnostics to run, hold down the Fn key while you are pressing the power button. If it then shows the diagnostics screen run the memory and hard drive tests. A faulty memory module could cause a blank screen, I've had this problem on a 1520.
Last edited by markmadras; 26th December 2010 at 14:55.
After the tests, take a look in Device Manager and check that the graphics drivers are all ok and nothing is showing yellow triangles. Did the external monitor come on without you doing anything, if so try hitting Fn and F8 together, that should switch between the on board and external screens.
I had to hit fn + f1 to switch to ex. monitor. All of the test came out fine, although I was looking at them on the ex. monitor. A few wouldn't display correctly on the CRT so I skipped them. In the meantime, everything in the device manager looks good. I reinstalled the graphics driver for the heck of with no change.
I've read some replies to similar case in other forums and found some folks had to replace the motherboard. This doesn't make sense. How could breaking the LCD take out the mobo?
I just found the display is working(I couldn't see it before), just not the back light. Remember, this is an LED backlit display with a new data cable. Still, no display will light up on it. Does this narrow down the possibilities?
Yep, it's just like the page you sent except there's no inverter on this one. Funny, they put the same model, same numbers, with two different displays. There's no way to tell unless you open it. I ordered the first display by model number like I always do. I got a CCFL backlight display. I had to send it back and specify the LED.
As a matter of fact, since I had this CCFL display, rather than send it back, I advertised it Craigslist. One woman was going to drive about 75 miles to get it. She called Dell, gave them the serial number and read my ad to the tech. He told her it was exactly what she needed. After driving up here, I opened her laptop to find an LED display.
So what now. I'm out of ideas and obviously your laptop isn't quite the same as detailed in the Dell site manuals. Unless you find there is a connection somewhere that hasn't gone in just right when you reassembled I can only presume that something on the motherboard has died.