Dell Inspiron 15 LA-9982p No power help please

[mcplslg123]

Re: Dell Inspiron 15 LA-9982p No power help please

Very likely shorted PCH. What is the exact resistance(no power connected) at PL301?? Are you getting +1.05V(I beleive no as SUSP# is the enable and missing)??

[harshana]

Re: Dell Inspiron 15 LA-9982p No power help please

PL301 —-> 70ohms

No I can’t see 1.05v

[Sephir0th]

Re: Dell Inspiron 15 LA-9982p No power help please

Beside the sum of measurements which does not fit to the observations I totally agree with mcplslg123:

Without this early sequences present the CPU can't heat up. On the other side we have way way to much consumption for the actual state of the board, even when we take a short in mind.

Also the heating PCH points to a short exactly there. On the other side the resistance of the 1.05V is still fine. But what about the 3VALW? If the resistance is fine there too there is still no reason for this high consumption confirmed then

So we probably have missing infos and for sure some wrong measurements here, which let us drive in circles.

How hot in fact is the PCH die. Can you still touch it or will it burn your finger?

[harshana]

Re: Dell Inspiron 15 LA-9982p No power help please

Beside the sum of measurements which does not fit to the observations I totally agree with mcplslg123:

Without this early sequences present the CPU can't heat up. On the other side we have way way to much consumption for the actual state of the board, even when we take a short in mind.

Also the heating PCH points to a short exactly there. On the other side the resistance of the 1.05V is still fine. But what about the 3VALW? If the resistance is fine there too there is still no reason for this high consumption confirmed then

So we probably have missing infos and for sure some wrong measurements here, which let us drive in circles.

How hot in fact is the PCH die. Can you still touch it or will it burn your finger?

Im away from the board now. But Im sure resistance of 3VALW was okay. and also I saw 3.3v there.

currently PCH is under a heatsink and for sure it will burn my finger after few seconds if I remove the cover.

this only happen after I press power button. before the power on signal, everything is normal. No heat appears on PCH before the power signal

[harshana]

Re: Dell Inspiron 15 LA-9982p No power help please

any luck

[mcplslg123]

Re: Dell Inspiron 15 LA-9982p No power help please

As @sephir0th has already mentioned, I still cant see any reason for PCH heating up as resistance on both 1.05V and 3.3V is ok as per your observations. Since the mb is trigerring, i dont think RTC section is shorted.Honestly, i couldnt figure out the reason for high consumption in absence of SUSP# signal.

[harshana]

Re: Dell Inspiron 15 LA-9982p No power help please

As @sephir0th has already mentioned, I still cant see any reason for PCH heating up as resistance on both 1.05V and 3.3V is ok as per your observations. Since the mb is trigerring, i dont think RTC section is shorted.Honestly, i couldnt figure out the reason for high consumption in absence of SUSP# signal.

Here is the reason as I found.


When I press the power button U2304 gets PCH_PWR_EN signal. (this signal enable PCH power. thats why PCH is heating.

when I test the resistance of 3VALW_PCH, it only has 55ohms.

I tested this rail at J513. Is that okay?? I think its lower. what do you think?

[Sephir0th]

Re: Dell Inspiron 15 LA-9982p No power help please

55Ohms at +3VALW_PCH is in fact a partial shorted 3.3V and most likely the reason for the hot PCH. So the 3.3V is not okay like already assumed before.

PCH is dead, board is donor.

[harshana]

Re: Dell Inspiron 15 LA-9982p No power help please

55Ohms at +3VALW_PCH is in fact a partial shorted 3.3V and most likely the reason for the hot PCH. So the 3.3V is not okay like already assumed before.

PCH is dead, board is donor.

Thank you for the support. Csn you please check my other thread as well. Im stuck there also. Here is the link


https://www.badcaps.net/forum/showthread.php?t=109457