Toshiba Satellite L50-b request for identification of the resistor.

Hello, I have been struggling with the motherboard from the Toshiba Satellite L50-b for a long time, namely with a resistor which has been burned, unfortunately there are no markings on it, and the scheme is not available and here is a request to colleagues who are more familiar with the topic for identification the resistance of this element, the mark on the board is R391, the motherboard DABLIDMB8E0 REV: E

Paste the macro image of the resistor area.

Quanta BLID (DABLIDMB8E0 rev.E) does not have SM.
Write what KBC do you have?
* hard to see on the photo.

On the "upright" Satellite L750 / L755 DABLBDMB8E0 Quanta BLBD with KBC U7 NPCE791LA0DX

boro1234567 wrote:

Paste a macro photo of the resistor area.

The picture quality is high after zooming in, the resistor area is very well visible. Greetings.

lisek wrote:

There is no SM on this Quanta BLID platform (DABLIDMB8E0 rev.E).
Write what KBC do you have?
* hard to see on the photo.

On the "close" Satellite L750 / L755 DABLBDMB8E0 Quanta BLBD with KBC U7 NPCE791LA0DX

The NCB is: NPCE985LA0DX
Greetings.

mar123cin wrote:

The picture quality is high after zooming in, the resistor area is very well visible.

That's how I like that I like cool photos.
How does the motherboard behave without this resistor?
What are the tensions on his pads?

boro1234567 wrote:

mar123cin wrote:

The picture quality is high after zooming in, the resistor area is very well visible.

That's how I like that I like cool photos.
How does the motherboard behave without this resistor?
What are the tensions on his pads?

That's all I got from my damaged Nikon.
The board does not start, no 3.3v on the 4 (VDD) leg at the KBC, it turns out that it is connected to this resistor, 3.3v is on one pad and none on the other.

Resistance from pads in relation to mass?

boro1234567 wrote:

Resistance from pads in relation to mass?

On one pad of what is 3.3v is 800 Ω on the second .000 short circuit

If it's the way you write, the resistor did not damage for no reason.
It looks like a short circuit.
What resistances do you have on the 4 KBC pin?
Can you throw the photo plates from both sides?

I also suspect that the reason must be, in KBC on foot 4 are 2 Ω in relation to mass

Then replace the NCB and solder a zero resistor.

so it turns out that there is a short circuit to mass at KBC ?? I'm asking because I do not have much to do with the discs.

The service power supply and fault test will dispel any doubts.

boro1234567 wrote:

The service power supply and short circuit test will dispel any doubts.

Thanks for the help I will continue to cheat. Best regards.

Quote:

KBC is: NPCE985LA0DX

Such NCB you have for example MB also from Toshiba (DA0BDDMB8H0 rev: H) or Quanta BDD platform, based on

Quote:

i7 4700MQ, HM87, NPCE985LA0DX, MXM3 N14E-GS-A1

The same NCB in the DA0BD9MB8F0 platform, Quanta BD9M> see appendix

Quote:

AMD Dual-Core A6-5200 processor
GPUs in the Accelerated Processor with AMD Radeon HD 8400 Graphics
KBC NPCE985LA0dx

Substitution KBC solved the problem with shorting, resistor replaced with zero, so far works.