Strange behavior on the proline laptop

[mnciks11]

Hello my lovely brothers

I'm facing a strange behavior here, the laptop comes up and quickly shut down.

When i remove the ram it cones on and the green light stays and doesn't shut down, I changed the ram and inserted another ram it still doing the same thing.

I checked the ram power supply there is no short to ground

Measurements are:
-Ram power supply = 1.5v
-Cpu power supply = 0.0v

Motherboard number it = 6-71-W24Z0-D02A I dont have the schematic

[SMDFlea]

Re: Strange behavior on the proline laptop

Schematic. https://drive.google.com/file/d/1mdu...uNfbbodo-/view
Bios. https://repo.palkeo.com/clevo-mirror/W2xCZ/

[mnciks11]

Re: Strange behavior on the proline laptop

Schematic. https://drive.google.com/file/d/1mdu...uNfbbodo-/view
Bios. https://repo.palkeo.com/clevo-mirror/W2xCZ/

Thank you so much brother i will update you all if I managed to solve this

[mnciks11]

Re: Strange behavior on the proline laptop

Hello guys please clue me up here on this machine, here my finds so far

I Have 1.11v on the vcore, and the gate on one of the mosfets for vcore power supply is 0.007 when compared to ground.

One more thing i have 0v on the gfx core

The laptop keeps on turning On and quickly shuts down after pressing the power button


Any clue guys, why the value of the gate is so low if compared to ground? Is this normal

[KvnTM]

Re: Strange behavior on the proline laptop

Hello guys please clue me up here on this machine, here my finds so far

I Have 1.11v on the vcore, and the gate on one of the mosfets for vcore power supply is 0.007 when compared to ground.

One more thing i have 0v on the gfx core

The laptop keeps on turning On and quickly shuts down after pressing the power button


Any clue guys, why the value of the gate is so low if compared to ground? Is this normal

The switching on those fets is really fast and your meter probably isn't picking it up correctly. Get a scope if you have one and look at it.

0v on gfx core is most likely your problem. Whats the resistance of gfx core to gnd?

[mnciks11]

Re: Strange behavior on the proline laptop

The switching on those fets is really fast and your meter probably isn't picking it up correctly. Get a scope if you have one and look at it.

0v on gfx core is most likely your problem. Whats the resistance of gfx core to gnd?

It 004 using continuity mode

[KvnTM]

Re: Strange behavior on the proline laptop

It 004 using continuity mode

Resistance please.

[mnciks11]

Re: Strange behavior on the proline laptop

Resistance please.

How?

What range should i set on my multimeter please help

[mcplslg123]

Re: Strange behavior on the proline laptop

How?

What range should i set on my multimeter please help

200 ohms

[mnciks11]

Re: Strange behavior on the proline laptop

200 ohms

It 04.8

[KvnTM]

Re: Strange behavior on the proline laptop

It 04.8

Thats fine.
What do you get on Pin 4 (VR_EN) of PU1?
Please measure while powering the board. It should go high when the board turns on.

[mnciks11]

Re: Strange behavior on the proline laptop

Thats fine.
What do you get on Pin 4 (VR_EN) of PU1?
Please measure while powering the board. It should go high when the board turns on.

Yes i did, i get 3.25v

The board is still doing the same thing, powers on and quickly goes off

I checked all the power supplies, they are all okay, 5v is okay, ram volts is okay i have 1.5v on the ram chip and coil, pch power supply is okay .

If i remove the ram it powers on and never shut down but obvious no display and doesn't post

[mnciks11]

Re: Strange behavior on the proline laptop

Can i have the list of things to check so that in feature i will know what to check guys and give you proper information.

[KvnTM]

Re: Strange behavior on the proline laptop

Yes i did, i get 3.25v

The board is still doing the same thing, powers on and quickly goes off

I checked all the power supplies, they are all okay, 5v is okay, ram volts is okay i have 1.5v on the ram chip and coil, pch power supply is okay .

If i remove the ram it powers on and never shut down but obvious no display and doesn't post

Now check
Gate & Drain voltage on PQ108, PQ109
Gate voltage on PQ110, PQ111

Can i have the list of things to check so that in feature i will know what to check guys and give you proper information.

There is no universal guide for troubleshooting something. But usually you always check all power rails before doing anything else. That will give you a clue of what is going on.
Power rail missing? => Fix it.
All power rails present and everything should be ok but no post? => Bios or dead CPU

[mcplslg123]

Re: Strange behavior on the proline laptop

Going by my experience, your sio chip is bad. Replacing it will solve your problem.

[mnciks11]

Re: Strange behavior on the proline laptop

Going by my experience, your sio chip is bad. Replacing it will solve your problem.

Thank you i have to find the chip and update you

[mnciks11]

Re: Strange behavior on the proline laptop

Now check
Gate & Drain voltage on PQ108, PQ109
Gate voltage on PQ110, PQ111



There is no universal guide for troubleshooting something. But usually you always check all power rails before doing anything else. That will give you a clue of what is going on.
Power rail missing? => Fix it.
All power rails present and everything should be ok but no post? => Bios or dead CPU

All gates have 0V of PQ110, PQ111, PQ108,PQ109 i have 0v on their gates, the Switching mosfets do receive 19v but they don't switch, they are not being told to switch