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Old 10-20-2019, 11:05 AM   #1
aquacattt
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Default HP Pavillion 15-p035nd no power

Hello guys.

I am trying to repair a HP Pavillion 15-p035nd, which has no power. I have a 19v rail, but no 3.3, or 5 volt.

In the picture you see me point at a component, where 19 volts goes in left, and 0.0v on the right. Also, on the mosfet above, input is 19v but no output. Output is also shorted to ground.

Does anyone have an idea to fix this?

Greetings,
Gerben.
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Last edited by SMDFlea; 10-20-2019 at 11:34 AM..
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Old 10-20-2019, 11:43 AM   #2
techtiger
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Default Re: HP Pavillion 15-p035nd no power

That’s a capacitor one side is ground other side you get power check your power button if it’s having 3.3V
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Old 10-20-2019, 11:47 AM   #3
SMDFlea
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Default Re: HP Pavillion 15-p035nd no power

Post the motherboard part number,it might be next to the memory slots and will be something similar to DAY23AMB6C0
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Old 10-20-2019, 03:18 PM   #4
aquacattt
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Default Re: HP Pavillion 15-p035nd no power

Hello guys,

The motherboard now does not get any power, it seems to not be able to recognize the charger correctly, it bounces between 0.45v and 0.59v. The charger also makes a high squeaking noise. Charger works correctly on another laptop.

The board did not make any 3.3v or 5.5v, so was unable to test that.

Around the memory slots was this:
tpt MV-0 20 94V-0
PEMLB028J7LPW
766473-501
DC14A0
Model: Y11A
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Old 10-20-2019, 04:20 PM   #5
techtiger
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Default Re: HP Pavillion 15-p035nd no power

In the post#1 you have said +19V +5/3V but now no voltage where did you test in MB , your +19V is short to GND
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Old 10-20-2019, 04:24 PM   #6
techtiger
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Default Re: HP Pavillion 15-p035nd no power

Take a pic of the MB both sides upload
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Old 10-20-2019, 04:46 PM   #7
aquacattt
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Default Re: HP Pavillion 15-p035nd no power

No, I said i did have 19v, but no 5 or 3 volt.

Edit: I desoldered a diode, after the 19v short to ground appeared, to no avail. https://www.youtube.com/watch?v=ki708kDH81s
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Last edited by aquacattt; 10-20-2019 at 04:49 PM..
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Old 10-20-2019, 04:58 PM   #8
techtiger
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Default Re: HP Pavillion 15-p035nd no power

There is a burnt mark on this MOSFET itís 30V N or P Channel Fet
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Old 10-20-2019, 05:04 PM   #9
aquacattt
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Default Re: HP Pavillion 15-p035nd no power

Oh my lord thank you so much! What kind of mosfet can I order? Should I get a N or P channel fet
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Old 10-20-2019, 05:11 PM   #10
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Default Re: HP Pavillion 15-p035nd no power

Just next to the Fet if it is mark as PQ20 as for the Schematic it’s N-channel 30V
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Old 10-20-2019, 05:15 PM   #11
aquacattt
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Default Re: HP Pavillion 15-p035nd no power

Alright thanks, i'll order this one: https://www.reichelt.nl/power-mosfet...?&trstct=pol_6

Last edited by aquacattt; 10-20-2019 at 05:29 PM..
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Old 10-25-2019, 01:01 PM   #12
aquacattt
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Default Re: HP Pavillion 15-p035nd no power

Hey guys,

So i replaced the mosfet. I do have 19v again now, but still have the same problem. Left pin 0 volt. Right pin should be ground right?

Do you have any other idea about what it can be?

Greetings,
Gerben van Dijk.
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Old 10-25-2019, 05:42 PM   #13
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Default Re: HP Pavillion 15-p035nd no power

any coil shorted to ground?
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Old 10-25-2019, 11:42 PM   #14
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Default Re: HP Pavillion 15-p035nd no power

The best thing to do is remove the B+ resistor and check which side is shorted to gnd and then apply 1V on the shorted side and see if anything heats up. Post measurement in resistance mode on all coils.
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Old 10-26-2019, 01:12 AM   #15
techtiger
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Default Re: HP Pavillion 15-p035nd no power

Quote:
Originally Posted by aquacattt View Post
Hey guys,

So i replaced the mosfet. I do have 19v again now, but still have the same problem. Left pin 0 volt. Right pin should be ground right?

Do you have any other idea about what it can be?

Greetings,
Gerben van Dijk.
you replace a N-Channel fet SOURCE DRAIN GATE no Ground pins go through Youtube/Googel ect how the Fets work without basic knowledge you will do more damage to the MB , upload a pic of MB how you replace fet Q20 , put the multimeter in DIODE mode and test GATE & SOURCE
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Old 10-28-2019, 01:44 PM   #16
digitalpc
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Default Re: HP Pavillion 15-p035nd no power

haha same problem with same motherboard ecxatly, do u fix yet?
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