Dell E6540 La-9412p

[Thermaltake]

Hi, I have Dell E6540, and laptop was working strange. CPU always on 0,9Ghz, on startup when I press power button laptop was powering On than shuts down and power up again, and boot in Win. normal. But it's turning on and working.
I disassemble the laptop and found on MBO that cap beside PQ706 have some black smoke on board and on the other side of the MBO section PU800 protective plastic that goes on top of the board have little whole on the plastic, meaning that this chip overheated and I see that one leg of that chip is damaged probably due overheat. My question is can only these two be the reason why laptop wasn't accepting battery, and CPU was working on 0.9Ghz only ?

I manage to find new chip for PU800, but can't find the values of that cap.



I attached pictures

[gs84]

Re: Dell E6540 La-9412p

use schematics: 22U_0805_25V6K

[Thermaltake]

Re: Dell E6540 La-9412p

Thanks.

Couldn't find it on schematics, I am expert in that field.

[reformatt]

Re: Dell E6540 La-9412p

Depends on what the cap is being used for in that part of the circuit. If it's just decoupling the main power rail (as it looks to be with two side by side), these are usually 10uf. If it's part of the boost circuit of a buck converter for example, then you need a donor or schematic to determine.

Slow CPU speed and not charging with Dell's is the system not recognising the power adaptor via PSID.

[Thermaltake]

Re: Dell E6540 La-9412p

cap and bq chip changed, and laptop is working normal now. Thanks everyone