Please could anyone help me with LENOVO GS452/GS552/GS752 schematic + boardview, thanks
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Hi Ideapad when Plugged in 3.3vALW and 5vALW are on, but 1.05vALW and 1.8vALW absent. Power led lights and remains always on and laptop not trigger..
Found a burned spot on LV5075B IC, replaced with a new imported IC, but 1.05vALW and 1.8vALW still failing. .
EC IT8586E working voltages and signals are all ok except PBTN_OUT# 2.44V not changing when power button is pushed and EC_RSMRST# always 0.1V ??
Reflashed EC IT8586E and Main bios with newly download dump from Lenovo site to no avail.
Should I fix again a new L5075B and replace IT8586E to solve the issues.... -
Hello all
I have lenovo GS452 GS552 GS752 NM-C781 not turning on checked first moseft pin 1,2,3&4 20v is present then pin number 5,6,7,8 there's 0v.
So my question is can the first moseft PQ5301 shorted -
hello to all
I need your help with this laptop mobo part no GS452 GS552 GS752 NM-C781
problem automatic on if I plug the charger adapter. also blinking power indicator on the power button and side power indicator on novuton key.
I suspected as try to clean my bios first.
other voltage checks 20v rails main mosfet normal have 3.3v and 5v alws
again kindly, please clean this bios backup bin,
TIA
...
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Hi guys, I have searched for this particular issue for the NM-C781 board but all I could find were schematic and bios requests, so apologies if this has been asked before.
I've got the above board from a friend, it appears to charge ok but as soon as you press the power button, the LED's on the side and on the button itself just flashes. I have checked around the board, there are some low resistance values to ground on some of the coils, mosfets and capacitors but they are not dead shorts (3.7 to 5 ohms) so im not sure if that normal.
I was wondering if anyone else... -
For Badcaps Readers, Please note that I am hopefully going to present this same message to Lenovo to see if they have any insight to the matter as well and figured to share the entirety here for clarification. The System is out of warranty as it is but does have the option to have it extended.
Model Information: T14 Gen 2 (Type 20XK, 20XL) Laptop (ThinkPad) - Type 20XK - Model 20XK0069US
Board: T14 Gen 2 (Type 20XK, 20XL) - Type 20XK.
System Hardware:
Processor: AMD Ryzen 7 PRO 5850U
Memory: 1x 16GB DDR4 3200 (Soldered on Board); 1x Crucial 32GB DDR4...09-08-2025, 10:46 PM
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