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Hello friends.
in nvdc design motherboard...find 0 volt at the the coil between the two Set of mosfets..but 8.41v at the output of the seconds set of mosfets ..means that my charger circuit is OK ! (Isl 9241)..and my laptop is not power on ..0 consumption at my power supply.. no shorts to gnd..means that my issue is somewhere at the motherboard !Leave a comment:
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Good... Face many lenovo with same faultLeave a comment:
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Hello..can you give us the voltage at the 2 sides of pc201Leave a comment:
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Thank you sparo.
i try to remove the gpu power but still the sale : no display.
All the voltages are present, good consumption..that s why i m so confusedLeave a comment:
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Any idea how to disable graphic card..i try many bios but still no display ..suspect the graphic card but i dont find any suggestion..Leave a comment:
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thank you but still same issue.
keyboared and mouse working only at bios mode ..not at windows
i try with another hdd and a nother windows but same issueLeave a comment:
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Hello smdflea...Just give me the bios région..i Will complete the others task..thank youLeave a comment:
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HP ProDesk 400 G3 DM bios
I don't why the driver section refuse my Product ID !
Please need a rebuil bios with the last version
thank you
HP ProDesk 400 G3 DM
Serial number : 8CG74327Z4... -
HP OMEN NO power no light
HP OMEN : DAG35DMBAD0
NO power ,no short ,no corrusion
Consumption : when charger plg in = 0.004 amp
Only 3/5 vl are present when charger connected..when i put my red probe at the coils of 3/5volts and power on with my power suplly it try to rise than 0v.
when try to power on using power button i note this starnge value : 3v then 0.300v then 3v !
No light at power button led
All coils resistances :
Pl 2001 =3v measured with kohm.
pl 2004 = 5v measured with kohm
pl 6001 = 49.7ohm
pl 4012 = vccsa = 24.4 ohm
pl 3001 =... -
It's the main bios , we ask you for the EC bios , the 16MB chip...Leave a comment:
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Lenovo Air 15ITL NM-D211 missing RSMRST !
Lenovo Air 15ITL.
NM-D211
This laptop won't power on , when power supply is on it takes 0.001 , button trigger on it becomes after a couple of seconds 0.061 amp..and nothing
No heating (Of COURSE) , no short to GNd at all coils present , 3/5 valw is present , 3/5 vl present.
With the power plane , at state 4 +1.8VALW and +3ALW_PCH must be present but no one due to enable signal is missing .
when button trigger on , 3v dow to zero than 3v , the super io send BTN_OUT#_R to pch but no rsmrst ..0v.
i follow his line , no short .
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LA-J081P schematics...Leave a comment:
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If there's no short at your motherboard , all coils are not shorted so i suggest to concentrate more at BQ24780S.
This forum is full of informations about it.
from my opinion , if i had 19v at pin 28 / 2.7v at pin 6 / 6v at pin 24 ...so i must find my 6v at pin 5 ( ACOK is pulled up to 3VL rail and not 3VALW rail in general )...and there's no short to gnd at BQ pins....so i change it simply .
ACOK must be 6V in this case get it from BQ24780_VDD
Is PR112 /PR111 populated at this motherboard !!Last edited by lapfix; 10-17-2025, 11:28 AM.Leave a comment:
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PR100 resistance to GND to know if there's a short at 19v rail
you can also check all colis for short
what do you mean by : when I short it out the laptop powers up....is there a display !Leave a comment:
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Many others measurements to take.
PQ101 is it OK (Diode mode)
PR100 measure with resistance mode
PU100 voltages : PIn 3 /4 /5...Leave a comment:
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Searching nuvoton nct 6683d schematic
Hello friends.
searching nuvoton nct 6683d schematic.
for lenovo la-c671p.... -
👁 lapfix
PU200
+5valw 25+ohm to ground /+3valwp 25+ohm to ground is very low , at first desolder this ic and see if the resistance at 3/5 valw is still low !
i have a doubt about pu 200 since you have find a solder joint was corroded and better to measure resistance to gnd if all his pinsLeave a comment:
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