hopkok
Senior Member
Last Activity: Today, 10:28 AM
Joined: 10-30-2014
Location: Trencin
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I was expecting that...... -
Hi, remove heatsink, clean mobo with IPA and post picture of Bios area. How much heat did you use? Any short under wifi module, its close to bios chip.Leave a comment:
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+RTCVCC is shorted, PCH needs to be replacedLeave a comment:
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That was idea before BQ replacement. Generating 5V_ALW need +3_VL or not? Not sure...Leave a comment:
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That is why I am sharing my idea...I have VCC on PU301, tried to replace PU301...and I was on end of my ideas, I tried to replace KBC...nothing helped, so I put everything back and started from begining... I desolder +3alw solder blob to disconnect this line, but +3_VL not pressented... Do you have any idea what to meassure before I take PCH out of board?
Am I right?
+3_VL is first generated voltage, after that can by generated 5V_ALW, than EC generate 3V_EN voltage, that activate +3_ALW...
Next I am wondering, how I could have +19_VB presented on PU301 and PU501 with faulty...Leave a comment:
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Hi guys, has this board, charging IC was dead, no voltage ACP/ACN (no short in 19V line). BQ24781 replaced, I have 19V good. Fast question, no +3_VL voltage, just 176 Ohm on +3ALW, so I injected 3V to that line and PCH is heating...
My idea is took if off, check resistance and replace PCH.
Anyway have the same board (spilled one) and there is +3ALW resistance in KOhms...so my idea shoul be right, what do you think?Leave a comment:
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You are right, all 3 boards dead CPU...Leave a comment:
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Hi, NM-D562 rev. 3.0? If so, I have 3 same boards with exactly the same issue. SUSP_N voltage missing, so any VS voltage not comming ON. How did you remove CPU without ripping pads? That black glue under CPU is my nightmare 🫣. ThanksLast edited by hopkok; 05-26-2025, 01:51 PM.Leave a comment:
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Did you try turn on without battery, just charger plugged in?Leave a comment:
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Hi, I reheated APU, but no change. Can this by KBC issue as well?...Leave a comment:
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Thanks for hint...will try. How about that horrible black epoxy around CPU, is there any good way to lift CPU without pads?Leave a comment:
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Legion 5 PRO, 3 boards, same problem, NM-D562 Rev. 3.0 motherboard
Hi friends, last week I got 3 same boards for repair (NM-D562 Rev. 3.0), same problem, power button light up, but motherboard wont start.
3,3V_alw and 5V_alw, 1,8V_alw and 0,75V_alw presented on all 3 boards, no other voltages. 1,2V missing and if I checked schematic right, I need 1,2V and than can be +3VS and +5VS generated after getting SUSP_N signal from KBC? or vise versa?
I checked for low resistance on coils, no low resistance.
Anyone with same issue like me?
Thanks for any help. -
Lenovo Legion 16ITHg6 NM-D721, keyboard not working, LEDs too
Hi masters, I need your help.
I am working on Lenovo Legion 16ITHg6
Motherboard number NM-D721, no BV, no schematic but I am attaching very closes ones.
INPORTANT: My motherboard version is with IT8258 IC, that is controlling keyboard and RGB LEDs.
My problem is on UI142, +3VALW_AG is not stable, floating from 0V to 3,3V.
AGKB_PWR_EN_N signal is floating too (that is why+3VALW_AG not stable).
Power LED is not working as well, power button working well.
UI26 ??? is there any firmware too? Powered by +3VALW_AG.
Motherboard... -
Thanks, I extracted from website, same error code, than resolder RAM slot and cleaned whole board in US cleaner, got picture, testing.Leave a comment:
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HP 15s-eq1904nc bios needed
Hi Master, I am looking for bios HP 15s-eq1904nc.
Board number: DA0P5MB26A1 REV:A
S/N: 5CD1401BSG
ProID: 25N78EA#BCM
Original Bios attached,
Issue: 5long blinks, 3 fast blinks no picture, current draw 0,7Amp, all voltages pressented...
Thanks in advance.... -
Hi Mon2, thanks for try to help, customer took his laptop, need to finish some important jobs before christmas. It should come back on January. Many thanks, have a great time, you helped me many times.Leave a comment:
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Hi I did exactly the same, laptop is working, but in device manager (code 43 for USB-C), charging works normally, but if I disconnect charger, in windows still shows like still connected. I tried to flash newest BIOS, but still the same....
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Hi mon2, PQ5402 was faulty, resistance more than 20 kohms, checked in diode mode too, 0,5V drop, seemed to be OK, I tried to replace anyway and its working...thanks for hintLeave a comment:
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ACDRV - 0V,
PR5404 - OK
PR5402 - OK
REGN - 6V
Let me double check mosfets tomorrowLeave a comment:
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Lenovo NM-D562
Hi Mon 2, I have got same problem, no voltage at point2. All input mosfets OK, no low resistance.
Chager IC BQ24780s has VCC presented -20V.
ACDET at pin 6 has 2,7V
ACOK pin 5 - 0V
I tried to replace charging IC, but the same.
From charged battery, its working.
Do you have any idea? Thank you...
No activity results to display
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