Dell Inspiron 5100 won't boot blank screen no noises no permanent lights

[darkrider]

Dell inspirion 5100 won't boot,already replaced power jack,problem improved slightly now shows following ,where as previously nothing.
with no battery + external power power and batttery light flash green every 10 sec .
with battery + external power power momentary flash twice of battery ,power and drive. battery light bright other two dull . no fan or other noise apparent screen stays blank.
Any ideas of source of problem, Help. need service manual , only found fsm for pull apart no info on servicing/repair or trouble shooting. nyome have a link to same. can't locate bios battery counldn't see it any where on mother board ,? wher is it would replace if new where it was. Any help apreciated
darkrider-

 

[Mark56]

You will find all the info here including manuals.

http://support.dell.com/support/index.aspx?c=us&l=en&s=gen&~ck=bt

As you have no fans running this sounds like a power supply failure which could be internal.

 

[Tmagic650]

The motherboard is probably bad. Heat is the culprit for the failure most of the time

 

[darkrider]

thanks

Thanks for replies Mark56 and Tmagic 650 ,and for help. Currently trying to get manuals from link you gave me , And will check over board for heat damage, is there a way to see what components most likely heat effected ie breakdown solder joints etc. I am no techno wizard but learn quickly. I will look over board again to see if can spot anything obvious wrong.

 

[Tmagic650]

"And will check over board for heat damage, is there a way to see what components most likely heat effected ie breakdown solder joints etc?"...

It's much easier to find these things on a desktop motherboard. Laptop motherboards have smaller components in a much smaller area, and they are surface mount components. If you see any burned areas, the motherboard is toast anyway. You can get good deals on replacement motherboards from EBay

 

[darkrider]

dell site

working through dell site, FSM no real;help. as it was same as one already had ,only gives disassembly diags. no diagnostic info etc. can't find a trouble shooting section that is of any real value,nor anything that describes/explains reason for light patterns. will keep at it as time permits ,may end up with replacing board or salvaging for parts, if not cost viable.

 

[Tmagic650]

There is no more need for troubleshooting this laptop. All you need is the disassembly info. You may be able to get a good used motherboard, but Dell replacement parts are among the most expensive. They want you to buy a new laptop. I have purchased HP, Toshiba and Sony laptop motherboards for less than $100. Dell motherboards go for around $250 or higher

 

[GeforcerFX]

yeah u got heat

those inspiron systems were notorious for overheating, desktop P4's with only one fan my XPS has 3 fans and the p4 clevo i have has 2 fans. i hade a 5150 and a 1150 both die this wayy, luckily a new mobo will run u cheap on ebay since it's flooded with these systems and there parts. to be honest i would prob get a different system or get a slower p4 to avoid the heat issue. if i remember correctly the cmos battery is on the palm rest on the bottom it's like green and has a lipo look to it.