Identifying dead laptop chipset/graphics

[Sojke]

Is it possible to identify bad chipset or graphics chips?
I have a Toshiba L675D LA-6053P laptop who turns on but wont turn off, and no image of course.
On its chipset Radeon 216-0752001 i find two completely shorted capacitors (0.0Ohm) , from my knowledge there aren't any inductors on these chips.

Is it normal to have capacitors in short circuit on chipsets?
Having to reball in order to find out takes a lot of time.

[diif]

Re: Identifying dead laptop chipset/graphics

I have a 216-0752001 here that has failed (laptop powered on, no picture).
Doing a quick test I find one shorted capacitor.
This chip was replaced with a new one and problem fixed.
It should take less than a hour to strip the laptop, reball/replace chip and reassemble. I don't think this is a lot of time.

[mielta]

Re: Identifying dead laptop chipset/graphics

Hi
do remove the two capacitors and look then what the matter.

i think you must change the chip with an new one

[Sojke]

Re: Identifying dead laptop chipset/graphics

I have removed the two capacitors and a whole lot other capacitors that were in short to take measures, the short still existed after checking all components in short meaning it might be a problem with the chip. The downside is that the southbridge also has shorted caps and some shorted resistors near it. Since this dumb ass Toshiba does not have marked components silkscreen i have to guess is it an 0ohm jumper or not.

Will reball today if it turns out it is faulty of the chip.

[Sojke]

Re: Identifying dead laptop chipset/graphics

Huh, turns out capacitors on chips can be shorted. Upon further inspection I found that one resistor near the BIOS IC was shorted as well. Removing it enabled the board to start and turn off (Display image). With some analysis and thinking we concluded that it is an 10kohm resistor and replaced it. Laptop now works like a charm.