Model: DV 6000
Fault: When laptop is turned on moments later it switches inself off
Description of Problem
We had a call out whereby a client's laptop when turned on would turn itself off again whever a key was pressed (seconds after being turned on). This problem occured 5 seconds after it had been switched on. Having run into simillar problems before, we made sure to run a few diagnostic tests on the laptop to findout what was causing this intimitent problem whereby each time the laptop was switched on, it would immediately swtich off again without any user response. One of oru first diaognostic tests that we ran tested the laptop's memory. We took the cover off from the memory compartment becasue we thought that the memory was making the laptop react the way it was reacting (i.e. switching itself off seconds after being switched on). After taking out the memory from the laptop, we switched the laptop on and waited for the boot screen to appear. After a few seconds, we tried entering the bios (user response) just to see if the laptop would go into the bios or would switch itself off. To enter the bios we had to press F2 so we pressed F2 and the laptop switched itself off. We thought that this seems a bit odd becasue we had alrady dealt with another laptop with a simillar problem and when we took out the memory and put the memory back into the laptop, that laptop begain working and started booting into Windows XP. We then thought that it may be the hard drive that was causing problems so we took the hard drive out of the laptop and again switched on the laptop. Taking out the hard drive had no affect when we turned on the laptop for the third time.
At this stage we we're a bit puzzled at what was causing this fault. We then thought it may be the screen inverter that may be cuasing the problem so we disconnected the screen. (i.e. with a very think flat head precision screwdriver we gently inserted this into the sides of the screen bezel all away round the frame of the screen, gently guiding the screwddriver down the groves of the screen bezel. Once the fram was removed from the screen, we then disconnected the screen inverter that had been connected to the screen. After taking this out, we then switched the laptop back on. The laptop again, after only a few seconds of being switched on, swtiched itself off. We then decided to disconnect the screen and take teh screen out of the frame. After taking the screen out, we then switched the machine on again, still we we're having problems - So far we had eliminated the memory giving problmes, the screen inverter giving problems, the hard drive giving problems and the inverter giving problems and eliminating these which may have given arise to the laptop switching itslef off as soon as it was turned on. We didn't reconnect the screen becasue we still wanted to condutct further investiagations as to why the laptop was switching itself off intimitently so we put the screen to one side, in a safe place so it wouldn't get scratched or damaged accidentally. After removing the laptop screen and moving it to one side we then turned our attentions to the laptop's motherboard. We had come to the conclusion that maybe a capacitor or transitor had become burnt/damaged so we got ready to take out the motherboard from the laptop. In order for us to gain access to the laptop's motherboard, we ahd to remove the keyboard, the keyboard cable and the outer case of the laptop.
We found removing the outer casing of the laptop a bit tricky becasue it was attached to the motherboard.
So far what we actually did was use the process of elimination to findout why the laptop had been behaving in the way that it was (i.e. finding out why the laptop was faulty using the process of elimination to draw our own conclusions). After removing outer casing, keyboard, hard drive, DVD writer and other internal components, we then took out the motherboard to check the capacitors and transitors, looking for signs of burning.
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