Nice, thanks for the explanation, so, i have to change the PUB1 component, this is a start point.
Thanks again....
Cicciotest
Member
Last Activity: Yesterday, 05:22 AM
Joined: 02-05-2023
Location: FOGGIA
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the REGEN (pin 24) whithout power measure 1.57 Kohm ... What does this mean? ...it's not short-circuited.
Also, maybe I'm wrong. From of the IC diagram, I seem to remember that is the same in this forum:
- pin 5 was supposed to measure 3V
- pin 6 was supposed to measure 2.6V
instead, I got
- 30mV on pin 5
- 2.9V on pin 6
🤪...Leave a comment:
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Ok, let me test this in a minutes, i post a reply after testing all you suggested, thanks!...Leave a comment:
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I left out a detail last night, sorry, I don't know if you saw it from the photo, but the 19V are also on the south pole of the small ceramic capacitor to the left of the PQB11 MOSFET (they are on the same track), but the pole north of the ceramic capacitor measure around 20 millivolts.Leave a comment:
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Yes! ok!
The resistor PRB3 to ground without power supply measure 10 M ohm in both poles, that goes down slowly slowly (but always high values) there is no continuity (between both two poles of the resistor and ground)....Leave a comment:
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Woops, sooorry sorry!!!!! You right those are in the back side of the board, you're absolutely right, i show you all i can test with power supply connected, see below, i really do not understand what are happening here: The yellow ones are literally "millivolts" only the 4 common pins below the PQB11 are 19v.
Really thanks for help in advance!!...Leave a comment:
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thanks sO much, but sorry, i cannot see PQB13 nor PQB11/12 or PQB3, i only find PQB2 on my board...I'm afraid i think it's quite different. I looked at the schematic of the K201P with a CAD viewer and identified the PQB13/11/12s, etc., but they're not on mine board, at least I can't find them, and the component composition isn't similar to the one on the board.
I've looked up all the abbreviations, and the only PQB I can find in my board is the PQB2 above the keyboard flat connector 😓.Leave a comment:
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Sorry, the red ones are in continuty and 0 ohms, and i've listed them with their code.
All the green ones sems to be good.Leave a comment:
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Today i've spend some time to test ceramic capacitors, those in RED are all in 0ohm and continuty, maybe i write the code of the label in the motherboard:
Beginning from LEFT-BELOW in clock order, so, going up and then in the right side:
- PL12
- PL303 + PL304
- PL305
- PLG02
- LL2
- PLM2
- PL2501
- PL13 + PL14
- L5 + L6
Is is really strange that all thees line of capacitor give 0 ohms, sems all under a circuit that is in short... but why? Are really all of these in shorts or maybe is there a component before of them...Leave a comment:
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Hi, thanks, yes, I figured those were CPU-related, so I ignored them. No, I don't have 0 ohms, but something like 0.6-0.4 ohms, sometimes even 1 ohms, but I saw up close that all those MOSFETs are buck converters and therefore share pins, hence the continuity.
Now... I should start again from the power connector. But I don't know which components to test and how to do it properly.
If I had a thermal imaging camera, I probably would have already solved the problem by injecting 1.2 volts into an input point.Leave a comment:
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i think that there is too many componente damaged here... too many componente damaged.
Mosfet and Ceramic capacitor that responds with low resistence, i have to remove all of them and test out of the board... anyway... i have to give up......Leave a comment:
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In the meantime I tested the continuity in the coils, the red ones give me continuity, the green ones are ok:
Those mark in red with arrow in CPU, i think that are OK becouse yes, there is continuity but the resistance value is really low.
Also the Fuse (FU1 753J) is ok.
...Leave a comment:
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I read it but I can't translate the diagrams very well, in any case I understood from there, that I have to test the MOSFETs of the main power circuit, I tested these and they are ok:
there is nothing else on this side.
Instead on the top side, near the power connector, I tested these small mosfets but I got some strange readings on two of the 3:
Also on this side these MOSFETs give me continuity:
...Leave a comment:
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THE MOTHERBOARS MODEL IS: IPA50 LA-K203P REV2.0Leave a comment:
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Here a zoom of power entrance area and SSD area where i placed the ssd plate... hope you can see better.
in the rear side of the motherboard there is nothing, is completely smooth.
...Leave a comment:
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HP 250 G9 - short circuit 100%
Good morning guys.
I made a mess. I opened the new laptop, replaced the NVMe SSD, and closed it. When I plugged in the power cord, I saw the orange LED glow dimly several times, so I immediately unplugged it. I could also hear a strange buzzing sound coming from the laptop. Then I opened it again, and only later noticed that underneath the SSD was an aluminum plate that touched practically all the underlying components... what a disaster. I still don't understand how I didn't notice. Anyway...
I thought, okay, I'll just remove the plate and go. But now the power LED won't even...
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