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jszollosi
Copper

Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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Hi guys,  i've been looking around at several forums, not just this one to see if there is a solution for the dim / dark screen issue which seems to plague dell inspiron 1545, 1537, etc.  I have seen people change motherboards and say it's fixed, and some simply refit the video cable to fix, but i now have 3 of these on my workbench and all have the same problem.  i have fitted new cables, new inverters, even a supposedly working motherboard to no avail.  I even borrowed a working 1545 laptop and tried the cable, screen and inverter from a broken one just to isolate the problem and they didn't work on it.  The real pain is that the original working components didn't work now either.    Now i've got 2 customers machines and a friends machine all with dim screens. 

Anybody got any  real answers to this issue, are there any Dell engineers out there that must have faced this issue?  Need a definate solution before i throw more money at the problem.

Regards

 

John

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53 Replies
Sue K
Bronze

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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John,

        Did you ever find out what is going on with the 1545 laptops? I have one also with a new screen and won't light up. It's an LED. I checked the cable and the lid switch and it works on another monitor. I can't believe the problems people are having with these.

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jszollosi
Copper

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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No sorry i didn't get to the bottom of that, i changed the board as well as the inverter, cable and screen individually to no avail.  What i should have done is change the whole lot together and it might have worked.

just as a note i actually fitted the screen of the first faulty 1545 i had into another 1545 and in that case it worked fine.  With this machine i was very carefull not to disconnect or put under any strain, the cable connection to the inverter.

So far i have found that in some cases it is the screen that has failed but others have no output from the inverter but changing the inverter or the cable has no effect.  Hope this helps.

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Sue K
Bronze

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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Thanks for writing. Mine is an LED and I see no inverter near the screen. I'm assuming it gets it's power from the board directly. I know what the inverter looks like and is usually on CCFL screens, But mine has to be a big pain. I have never seen a waste of money like this. lol

I think you've been through the mill also. lol Thanks very much and good luck!!

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TKOGunn
Copper

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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Sounds like you have/had a LCD Screen problem. I had the ame issues with dark/black screen on my Inspiron 1545 and we replaced the LCD screen and also the screen inverter. Those two repairs fixed the problem.

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Scoobie103
Copper

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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I have an Inspiron 1545 with an LED LCD.  I needed to replace the display similar to other stories I have read.  I purchase a replacement from DELL.  It did not work, image appeared extremely dim in background.  I called DELL and they sent me a second display.  I replaced the display again, but still with the same result.  There is only one cable that attaches from the display to the mother board.  I have checked, double checked and triple checked.  The connection is solid.  DOES ANYONE HAVE A RESOLUTION FOR THIS PROBLEM?  If I start dumping more money into this, it will cost more than the laptop did.  If there is an invertor, where is it, if it is not attached directly to the display? Thanks for any help anyone can offer!

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Sue K
Bronze

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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Scoobie, Well I gave up. I checked and double checked also. I have read that some people say that the motherboard goes bad after the screen has been cracked. I've even heard about people buying new motherboards and now the new screen works. lol  I'm not buying one. I could buy a new laptop for the price of a board. Someone said inverter. No inverter for mine. It is an LED LCD, Not a CCFL.  CCFL has the inverter. LED has one cable and thats it.  Too bad you've got the same problem.  We were so mad.

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tommyredman
Copper

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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I beleive i have your answer.  The lcd screens have a led backlight.  This backlight is fed power through the 40 pin connector which is fused by a 3A/ 32V fuse on the motherboard which is by the connector and marked F1.  Not an easy replace for the unexperienced but possible.  Ohm out the fuse and check that first.  Or you could jump the fuse with wire, but it could hurt your mother board if another problem exists and too much current is sent to it.  Hope this helps, and good luck.

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BruceNJ
Copper

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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tommyredman,  I have been looking for an answer like yours.  I have an Inspiron 6000 with a CCFL backlight.  I have the usual symptoms -- I can read the black screen if i hold external light just right -- and an external monitor works fine.   I have replaced the screen and inverter (they come as one piece) and I have also replaced the single ribbon cable that carries data to the screen and power to the inverter.  I continued to disassemble and have searched for anything that looks like a fusible link or anything that is labelled F1.  Nothing found as yet.  Any other ideas?  Where can I find the pin-out for that ribbon cable connector?    Thanks

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ejn63
Diamond

Re: Dell Inspiron 1545 dark or dim screen / no backlight - yes that again!

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It sounds like it's the mainboard - if you can see an image, the video is OK, but the power circuit that supplies the inverter is bad.

There are two different boards depending on whether you've ATI or Intel video.

www.parts-people.com/index.php

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