Lenovo L490 Ram voltage circuit malfunction

[rddube]

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...

[6ndr6w6]

BIOS PLEASEE

The notebook turns on and the fans spin but there is no display.

IdeaPad3 15ALC6

HS461&HS561&HS761 NM-D521 REV 3.0

MO: PE9013604027
MTM: 82MFS00100
S/N: PE0AS1AK
CPU: Ryzen 5 5500U...

[Blitzbirnle]

Hi everyone,

I'm having an issue with my motherboard (GALE 4G WHL MB-18709-2, model 15-cn1103ng). The problem is that one IC near the battery connector gets hot, causing the system to enter a boot loop — it powers on briefly with the fan spinning, then shuts down again after about a second.

IC shows:

7J=5J
T3J

I've attached a picture of the IC in question. If anyone can identify this component or has seen a similar issue, I'd really appreciate your help!

Thanks in advance!...

[tuner2000i]

hello everyone,

I don't normally do tv repairs but this is a case with my personal TV which got fried together with many other electronics in my house after a thunderstorm.

The TV is a Philips 65PUS8518/12 which had no power. I measured and concluded that the main board was probably fried through ethernet or hdmi. I found a board with same number 715GD328-M0F-B00-005Y (I had G) but from a 55PUS8518. The TV starts but the image is doubled, distorted. I need to set the panel code which is 016 according to the sticker on the back but I can not seem to do it.

...

[neandertool]

Hi, hoping someone can help me out with this one. My laptop just died and I really need to get it fixed. Thanks in advance!

[taso]

Hi everyone:

Anybody know anything about a N.switch without resistance in 6 & 19 pin (D+) in USB C conector? This is a HAC-10 board, all conector pins al good. Console runs ok but charging in very very slow 005 mAp.
Thx!!!...

[JuanLove]

Hey, I have a laptop board that is missing some components. I need a boardview or schematic.

Thanks in advance.

JuanLove

[BootNewbie]

3 days prior my Lenovo laptop notified of a bios update, at first I tried to decline it but when i put it on charging lenovo vantage started installing it automatically. After bios was updated i was asked for ftpm reset, first I chose no but same pop up showed up so i had to choose yes. After this concluded i successfully booted, but i had linux dual booted with windows, and it was nowhere to be seen after bios update, i tried secure boot off then successfully entered linux. after shutting down my laptop i encountered this issue:

power is supplied
screen remains blank (it gets...

[hosain0489]

Hello everyone,

I’m looking for the schematic and boardview files specifically for the AMD version of the HP Omen 16 laptop, model xf0006AX, equipped with the Ryzen 7 7840H CPU.

Most of the files I’ve found are for Intel CPU versions, and I need the exact files for this AMD Ryzen 7 7840H model to assist with repair and troubleshooting.

If anyone has access to these files or can kindly share the boardview and schematic for this particular AMD version, I would really appreciate your support.

Thank you very much in advance!