petr.hlavacu
Member
Last Activity: 03-23-2025, 12:04 PM
Joined: 11-15-2020
Location: Brno
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Problem solved. The accelerometer (U9) was faulty. I tried again injecting voltage to +3VL, the current went up to 0.3A and at that point it was already visible on the thermo. Interesting that it was not visible in the previous case. After disconnecting it from the board, the laptop works without problems. Thanks for your help anyway.... -
HP dk15-1005nc - Bad +3VL rail
Hi, i have HP dk15-1005nc (mobo LA-J641P). The battery was accidentally plugged in with the opposite polarity and since then the laptop cannot be switched on. I repaired short in charger circuit, then i discovered bad PU301 (SY8288).
After the replacement I found that after connecting +3VL to the LDO pin (PJ303 on the board) the LDO switches off immediately. If I leave the contact disconnected, 3.3V for +3VL normally comes from LDO.
I have tried injecting voltage directly into +3VL with LDO disconnected and the draw is about 0.2A, nothing on the board heats up. The resistance of +3VL... -
OEM DELL RTX3080 - after memory reflow, working then dead.
Hello, I got my RTX3080 from DELL. The problem was that in the load appeared artifacts and then BSOD or straight reboot PC.
I tested the memory using MATS and no errors were found. So I assumed it was a cracked solder ball under one of the video memories.
I reflowed the memory, and the card started working. It worked for about 2 days, and then after about 2-3hrs of load, the monitor suddenly shut down, and since then it can't post anymore. Temperatures were normal the whole time.
Is this the definite end for this card? -
Re: Please help me identify SMD components on HP Omen 17
Hello again, I've been busier so I'll comment later.
I think I identified the wrong package and it could be a UML2N in a SOT-353 case.
[url]https://cdn.badcaps-static.com/pdfs/320d25e732545aa164531e975aa47294.pdf[/url]
Do you think that's possible?Re: Please help me identify SMD comp...7294.pdf[/url]Leave a comment:
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Re: Please help me identify SMD components on HP Omen 17
Thanks. I'll check it out....Leave a comment:
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Re: Please help me identify SMD components on HP Omen 17
to SMDFlea:
No there is only L2x (the "x" has different font).Leave a comment:
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Please help me identify SMD components on HP Omen 17
Hi, I have a motherboard from HP Omen 17 (DAG3BEMBCD0 rev. D) with two SMD components burnt. They are labeled as "L2x" , the package is probably SOT-23-5.
The components are labeled in the picture.
Can someone please help me identify these components? I could not find the schematic for the motherboard. The closest in terms of SMD markings are APL3512 (marking: L2A1, L2A4, .. L2Ax).
Thank you for any help or advice.... -
MSI GE72VR - blackscreen dGPU not power up
Hi, I have a problem with this laptop. Does not display (even on an external LCD). All voltage rails are present except dGPU power supply (NVDDS) after further investigation I found that DGPU_PWR_EN which leads from PCH is 0V. Can anyone advise me? It's weird that a laptop won't boot at least with iGPU. I tried BIOS reflash and it didn't help. -
Ideapad Yoga 3 14" - help with repair.
Hi, i have a Lenovo Ideapad Yoga 3 (14", i5-5500U, board NM-A381). It only light up power led (no screen, fan spin, nothing). I found shorted mosfet on vcore rail. After replaced the mosfet its turning on. Fans spins up and down according to temps but still no screen. I found the coil next to replaced mosfet warm up, then getting hot. I measured the coil and it seems fine.
Can anyone advise where to continue to look for a fault?
PS: Sorry for my bad english.
EDIT: Vcore voltage seems fine. -
Re: HP Probook 4540s 683494-001 bios
Thank you! Safe my day.
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