HP 15S-fq2006np all voltages present but wont boot up

[Kambi13]

Hi there, I have an hp 15S-fq2006np that had some liquid damage. After cleaning and replaced some resistors and capacitors, the laptop returned to life.
Worked fine. Fresh Thermal paste, ran some stress tests. Prime95 ran for 6 hours straight. Everything seemed ok.
After a couple of hours costumer was playing a game and suddendly the screen went off. Now pressing power button, the power light comes on, all voltages are present but no fan spin, and nothing on screen
CPU doesn't get warm. Changed ram sticks also, but still the same.
Could it be a messed bios? He said nothing was updated.

Motherboard DA0P5MB38A0 REV:A

Best Regards

[Sephir0th]

Re: HP 15S-fq2006np all voltages present but wont boot up

If the CPU doesn't get warm then you're usually missing voltages, so please double check your measurements and even better share them here in relation to the various power rails.

[reformatt]

Re: HP 15S-fq2006np all voltages present but wont boot up

It will be liquid damage you have missed most likely. With the laptop in use, any deterioration from corrosion is accelerated. Did you inspect the board under a microscope? You may also have some crap under a BGA etc. Ultrasonic?

[Kambi13]

Re: HP 15S-fq2006np all voltages present but wont boot up

Here are the voltages. Check attached picture
No BGA was affected

[Sephir0th]

Re: HP 15S-fq2006np all voltages present but wont boot up

Your CPU isn't powered at all, as already assumed. The 1.8V there are for the PCH FIVR. Measure resistance to GND there and check the Enable for the VRM Controller

[Kambi13]

Re: HP 15S-fq2006np all voltages present but wont boot up

Resistance to ground in the Coil with 1,80v is 208,7 ohms, the other two have 55,7ohms

PWM controller is an Intersil 95860HRTZ, cant find Datasheet anywhere

[mcplslg123]

Re: HP 15S-fq2006np all voltages present but wont boot up

Quanta OP5D schematic and boardview is there on forum. Search for it and that may help you.

[Kambi13]

Re: HP 15S-fq2006np all voltages present but wont boot up

This Motherboard is OP5H, pwm controller is not the same

[roswelldx]

Re: HP 15S-fq2006np all voltages present but wont boot up

Quanta OP5D schematic and boardview is there on forum. Search for it and that may help you.

Hello friend, would you be so kind as to say where the schematic of the op5h would be because nothing appears in the search engine. Thank you very much

[Kambi13]

Re: HP 15S-fq2006np all voltages present but wont boot up

Hello friend, would you be so kind as to say where the schematic of the op5h would be because nothing appears in the search engine. Thank you very much

To my knowledge there is no schematic or boardview for this motherboard yet