Acer 5250 0816 Powers Off

[maddog310]

Picked up this laptop with a cracked screen, no adapter,battery or hd. Used an adapter I had, wouldn't post. Took it apart, connected power, fan spins and Led1 on motherboard lights then powers off.
Here are some voltages

PJP1 19.36vdc
PJ1 3.323vdc
PJ2 0.000vdc
PJ5 19.36vdc
PJ11 0.000vdc
PJ4 1.102vdc
P13 5.06vdc
PJ 6 or 8? 0.000vdc
PJ14 5.06vdc
Took some readings after pressing the power button also.
Any help is appreciated.

[maddog310]

Re: Acer 5250 0816 Powers Off

Logged me out before I could post pics.

[zx8401]

Re: Acer 5250 0816 Powers Off

Have you tryed putting the memory strip in the bottom slot only?
Some acer machines wont do anything if its wrong.

[maddog310]

Re: Acer 5250 0816 Powers Off

Thanks for the reply............. yes I tried that, I have two sticks of ram and tried them in all combinations.
Not sure if the laptop was dropped cracking the screen and causing damage to the board or if it was smashed because it wasn't working.
Some voltages only show if AC is plugged in per the manual, likely a short somewhere. Here is the schematics.

[dellxps15]

Re: Acer 5250 0816 Powers Off

fan spin?

chip under heatpipe ? flashed bios ? voltages on all coils ?

[maddog310]

Re: Acer 5250 0816 Powers Off

fan spin?

chip under heatpipe ? flashed bios ? voltages on all coils ?

Yes fan spins as I had mentioned in my first post.
Are you talking about the cpu?
Not sure how to flash a bios if it won't post, I've only flashed a bios once and that was on a working computer.
Here are some voltages

PL1 19.36v 19.36v
PL2 4.65v 4.65v
PL3 19.36v 19.36v
PL4 3.334v 3.324v
PL5 5.06v 5.06v
PL6 4.65v 4.65v
PL7 0.000v 0.000v
PL10 19.36v 19.36v
PL11 1.102v 1.102v
PL13 0.000v 0.000v
PL16 19.36v 19.36v
PL17 19.36v 19.36v
PL19 0.000v 0.000v

The ones with 0v showed voltage when the power button was pressed.
Didn't get all of them yet. Also took the pipe with heat sink off, looks like someone had it off before. Had white compound and a tiny bit of old hard grey compound left on it. Reapplied new stuff on both chips......... no difference.

[lorins_core]

Re: Acer 5250 0816 Powers Off

Yes fan spins as I had mentioned in my first post.
Are you talking about the cpu?
Not sure how to flash a bios if it won't post, I've only flashed a bios once and that was on a working computer.
Here are some voltages

PL1 19.36v 19.36v
PL2 4.65v 4.65v
PL3 19.36v 19.36v
PL4 3.334v 3.324v
PL5 5.06v 5.06v
PL6 4.65v 4.65v
PL7 0.000v 0.000v +1.8VSP Check this if have +5 always on if have?
PL10 19.36v 19.36v
PL11 1.102v 1.102v
PL13 0.000v 0.000v+1.05VSP? check PQ34 & PQ 35
PL16 19.36v 19.36v
PL17 19.36v 19.36v
PL19 0.000v 0.000v +APU_CORE Supply for this? Check PQ44 and PQ45

The ones with 0v showed voltage when the power button was pressed.
Didn't get all of them yet. Also took the pipe with heat sink off, looks like someone had it off before. Had white compound and a tiny bit of old hard grey compound left on it. Reapplied new stuff on both chips......... no difference.

Hope are Solve this...
post the result

Thanks

[maddog310]

Re: Acer 5250 0816 Powers Off

These are the voltages i get when pushing the power button.

PL7 1.8v
PL13 1.059v
PL19 .990v

So I am assuming these are to have voltage with just power connected.
Can I check the voltages on those mosfets to see if their alright, and how would I go about it.

Thanks

[maddog310]

Re: Acer 5250 0816 Powers Off

Checked PQ34, here are my results

+S1 -D8 = .478v
+S2 -D7 = .477v
+S3 -D6 = .477v
+S3 -D5 = .476v

-S1 +D8 = 0L
-S2 +D7 = 0L
-S3 +D6 = 0L
-S3 +D5 = 0L

-S1 +G = .896V
-S2 +G = .893V
-S3 +G = .893V

From what I've read it looks good, am i heading in the right direction!

[maddog310]

Re: Acer 5250 0816 Powers Off

Checked PQ34, here are my results

+S1 -D8 = .478v
+S2 -D7 = .477v
+S3 -D6 = .477v
+S3 -D5 = .476v

-S1 +D8 = 0L
-S2 +D7 = 0L
-S3 +D6 = 0L
-S3 +D5 = 0L

-S1 +G = .896V
-S2 +G = .893V
-S3 +G = .893V

From what I've read it looks good, am i heading in the right direction!

Checked PQ34 in ohms beep mode

-S +D = OL no beep all pins
-S +G = OL no beep all pins


PQ35

+S1 -D8 = .090v
+S2 -D7 = .090v
+S3 -D6 = .090v
+S3 -D5 = .090v

-S1 +D8 = .066v
-S2 +D7 = .066v
-S3 +D6 = .066v
-S3 +D5 = .066v

-S1 +G = OL
-S2 +G = OL
-S3 +G = OL

ohms beep mode

-S +D all around 129 ohms and beeps, all pins

-S +G = OL all pins, no beep

PQ35 looks bad............. any thoughts.