hi, in a lenovo 17807-3m , 19V_DCBATOUT voltage is 7.8v. DCIN voltage is normal 19v, i have replaced the isl9538, charging mosfet also replaced , also there is no shorting, pls guide. thanks
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Hello friends,
Looking for some guidance here. The RAM voltage circuit on this motherboard keeps burning out PU301 which is a RT8231AGQW. Copy of the board with the burnt chip attached with some voltage measurements and copy of the schematics also included.
I think I've checked almost every component in the circuit, but when I change the RT8231, the laptop starts I have 1.2V on the inductor for about 10 seconds and then the RT8231 goes south and no more voltage on the inductor. All other voltages on the laptop are good, this is the only one conking out for a reason I... -
First of all, ive veen reading these forums for some time and its always veen very helpful, so i thank you all for this amazing comunity.
I have a lmq-2 13268-1 motherboard from a lenovo x1 carbon 3rd gen. And the MX25l12873f (U49) bios pin 8 is not getting voltage.
So far these are my diagnostics:
When given 19v trough power adapter, consumption reads 0.003 amps for about 5 seconds then nothing.
When power button pressed same result, and i get three green blinking lights from the pwr btn led. But foesnt turn on.
If i plug the battery... -
Hi all,
I have a Lenovo Yoga 13 Panasonic here, when powered- both fans spins (the sconds starts with a bit of a delay), no image neither on HDMI nor the display
- most voltage rails seem OK (see image below, red labels)
- resistnace to ground mostly seem OK as well (blue labels)
- the resistance to ground is rather low (1.9ohm)
- when injecting the voltage (1V), it consumes around 200mA, seems OK to me (?)
I can't find a schematics for the board - can some of you gurus look at the voltages?... -
My T14's (NM-C801) main USBC input keeps failing every few months. Initially, it worked fine for several years. The symptom is that once powered from the main USBC port using a 65W power brick, after some time (minutes, hours) charging will fail completely. Powering from the secondary (docking) USBC input still works. This laptop is basically always plugged in. The first time it happened, it took me a long time to find that the FPF2281 over-voltage IC for that USBC input was at fault. When the issue occurs, it will continuously reset power delivery negotiations with the power brick -- according... -
Lenovo 3000 Series Schematic
Lenovo 3000 was a line of low-priced notebook and desktop computers designed by Lenovo Group targeting small businesses and individuals. It was replaced with the IdeaCentre and IdeaPad brands.
3000 C100 laptop with Braille keyboard
Lenovo 3000 C
C100, C200 - 15-inch XGA screen
Lenovo 3000 N
N100, N200 - 14.1-inch- and 15.4-inch- WXGA models
N500 - 15.4 inch screen.
Lenovo 3000 V
V100, V200 - 12.1-inch WXGA models
Lenovo 3000 G
G400, G410, G430, G450, G455, G510, G530, G550, and G560...10-04-2024, 06:05 AM