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Dell Latitude gets power, then turns off

By salvi ·
Hello, I have a Dell Latitude that when I press the power, all the lights turn on and everything, then after a few seconds it dies. It doesn't go to post nor anything. The window stays black.

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by jurbanski In reply to Dell Latitude gets power, ...

It is possible that it could be the motherboard. Does it matter if the laptop is plugged in or not?

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by salvi In reply to

I don't know if it's the motherboard, gets no beeps at all. It doesn't matter whether it's plugged in or not.

It was working before, but it had cleaned it out because it has roach crap all over the inside. Cleaned it and it was working fine. Days later it stopped working.

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by mjd420nova In reply to Dell Latitude gets power, ...

Something is shorting the power supply and making it shut down. Maybe there's still a few bugs(eeww) inside. I've had to clean more than a few with roaches, and they really make a mess. Disassembly sounds like fun, but you might need to do it again. Pay real close attention near the power connectors to the motherboard, and if possible try to trace out the main lines on the board and clean again. I have used Windex all purpose cleaner, a small soft bristle toothbrush, then fresh water and finally with an electronic cleaner spray that leaves no residue.

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by salvi In reply to

The first time I took everything apart and cleaned it. Then after putting everything back together we were betting that it wouldn't work, but amazingly it did. A few days later it did the same thing again and I completely cleaned it again with an electronic cleaner. THis time it did not want to turn on again

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by HAL 9000 Moderator In reply to Dell Latitude gets power, ...

From your description it sounds as if something has been left inside that has shorted out the device.

You'll need to know some basic Electronics to go from here and it also involved a total strip out and clean as well as tracing the main Power Rails into the unit. Look for any solder joints that a grainy or not shiny as they could be bad or what is called a Dry Joint If you find any bad solder joints mark the position and then turn the Board over to see what's on the other side if it's something big it's most likely replaceable if necessary but if there is a Surface Mount Chip located at the bad joint or on the other side of the Board then unless you have some top line soldering gear it's a lost cause even something as simple as a Surface Mount Diode is almost impossible to replace without destroying it in the process.

Just as a Side Note you should Never[/v] use Spray & Wipe as it dissolves the copper on the tracks and will lead to the total destruction of the unit if not completely cleaned off the M'Board. One company here fires any tech caught with a bottle of Spray & Wipe in their possession.

Col

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by salvi In reply to

Well, that means I'm going to have to take it apart again and check everything out. What is Spray and Wipe? I used electronic spray.

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by HAL 9000 Moderator In reply to Dell Latitude gets power, ...

Spray & wipe is purchased from a lot of Supermarkets as a Glass Cleaner and is very caustic to circuit boards. It will also kill off the carbon used in Key Pads and the like as well so it's a very dangerous thing to use.

A lot of Electronic Cleaners come in small containers and are expensive to use so they are used sparingly but a product called Mohawk Safety Solvent is safe to use on electronics as well as plastics and doesn't leave any coating on the parts that have been submerged in it. It also has the added advantage of having a high Flash Point so you are not likely to start any fires.

This type of thing really involved a lot of close looking under Magnification with decent light the Circular Magnifying Lights that are commonly used by General Surgeons and Electronic Suppliers are excellent for this purpose as they allow you a free look see without any hindrance.

By the way you don't need to completely reassemble the unit before testing I would suggest that you clean up as best you can and then try powering on without the HDD, Floppy or Optical and use the external Monitor to save reattaching the monitor. You can also use an external Keyboard plugged into the PS2 socket and see if it's going to work before starting the reassembly process and after you get each part working add one more bit and then try again till it is completely assembled and running if you can get it that far.

Col

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laptop

by hotdogger11 In reply to Dell Latitude gets power, ...

try bumping on the bottom where the memory chip is.
mine does the same thing & it comes on after I bump on the bottom.
it's like the chip loses connection

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Can be a simple fix - ensure the RAM is seated correctly

by rbnelsrbnels In reply to laptop

I just had these identical symptoms after trying to upgrade my RAM by replacing it. Then got same symptoms when I put the old RAM back in. It wasn't until after seeing hotdogger11's post and a few others about RAM, especially one that stated that the identical symptoms happen with no RAM at all that I got suspicious and opened another laptop and noticed that I wasn't seating the RAM chip in "all the way" (e.g. wasn't pushing it far enough in while it was angled at 45 degrees before snapping it down into place). Seated it properly and no it work fine. So check your RAM is seated properly before despairing about mobo problems.

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CD worked for me

by theryall In reply to Can be a simple fix - ens ...

We had this on our D505 about a month ago and much to my surprise the recommendation of my mother-in-law worked: insert a CD then hard boot.

That probably won't work for you but is surely worth a go.

I always thought mothers-in-law were good for something.

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