Lenovo Ideapad 320 Stuck at 330mA

[Anirudhvl]

Lenovo Ideapad NM-B241 turns ON but no Display. Taking 330mA, No voltage coil PL1001 +VCC_GT.

[mon2]

Re: Lenovo Ideapad 320 Stuck at 330mA

hi.

1) remove all power.

2) Meter in resistance mode.

Measure and post the:

a) resistance between source (1-2-3) & drain (5) of PQ1001.

b) resistance between source (1-2-3) & gate (4) of PQ1001.

c) resistance between drain (5) & gate (4) of PQ1001.

d) resistance between source (1-2-3) & drain (5) of PQ1002.

e) resistance between source (1-2-3) & gate (4) of PQ1002.

f) resistance between drain (5) & gate (4) of PQ1002.

[Anirudhvl]

Re: Lenovo Ideapad 320 Stuck at 330mA

a) PQ1001- S vs D - 8 Mohms
b) PQ1001- S vs G - 13 Mohms
c) PQ1001- D vs G - 1.0 ohms
d) PQ1002- S vs D - 4.5 ohms
e) PQ1002- S vs G - 4.5 ohms
f) PQ1002- D vs G - 0.0 ohms

[Anirudhvl]

Re: Lenovo Ideapad 320 Stuck at 330mA

Another important thing is I am getting 0.845V on coil PL1001. Actually voltage is miising on PL1003. I made mistake while typing the title.

[Anirudhvl]

Re: Lenovo Ideapad 320 Stuck at 330mA

a) PQ1005- S vs D - 8 Mohms
b) PQ1005- S vs G - 8 Mohms
c) PQ1005- D vs G - 1.0 ohms
d) PQ1006- S vs D - 2.2 ohms
e) PQ1006- S vs G - 13.7 ohms
f) PQ1006- D vs G - 13.7 Kohms

[mon2]

Re: Lenovo Ideapad 320 Stuck at 330mA

Desolder PQ1006 and measure & post the resistance values again on this removed mosfet. Some of these readings look very low on the mosfets.

Perhaps a dead CPU ?

[Anirudhvl]

Re: Lenovo Ideapad 320 Stuck at 330mA

No idea. Any way planning to change those PQ1001, PQ1002, PQ1005, PQ1006 and PU1402

[Anirudhvl]

Re: Lenovo Ideapad 320 Stuck at 330mA

UPDATE!
I did once more check up before ordering the components. I found PL1003 has a momentarily output of around 0.680v some times while observing with DSO. So I did checking all the resistors around the PU1402. All were correct. Then just by an intuition flashed bios from https://www.badcaps.net/forum/showthread.php?t=72785 this thread, and all went right. Now it does have display.