Acer Aspire 5252 missing network(lan) in device manager

[Scootie]

I got this laptop cheap from someone because the laptop didnt start up. The fix was easy, I had to reball the gpu. So far so good. After I installed a new windows I noticed that Im missing the network(lan) from device manager, no matter how many times I hit refresh it wont show up. Wifi is okay.
Curios, both leds light up when I plug cable into the port.
Motherboard model is:
HannStar J
MV-4
94V-0
or PEW96 LA-6552P.

[fddizon]

try this schema

[Scootie]

Yes, thank you but already found the schematic. Lan circuits are on pg 24-25 and im trying to figure out how to interpret them. Truth to tell, it's the first time I dwell really into schematic reading.

[dellxps15]

try plug a cable on laptop and see if lan comes in

[Scootie]

Originally Posted by dellxps15

try plug a cable on laptop and see if lan comes in

Nothing happens.

I managed to read and check all voltages from p.24. They all check, tough instead of 3V i have 3.3V but I dont think that matters.
However I noticed that there is a slight discolour on the lan chip(lower right corner) as shown in the picture, which I could'nt clean away. I check the voltages around and some pins had 1.2V, 3.3V, less then 1V or nothing on them. Im not sure that counts for something.

[dspok]

@Scootie
Did you check LAN config if it is enabled in BIOS?

[Scootie]

Yes, it is enabled, the bios was also reset(baterry out).

[dspok]

@Scootie
I would like you run Linux Live CD & see if LAN works (to be sure).

[dellxps15]

try with linux. did the computer got hit by a flash (the one when there is bad wheater)

[Scootie]

Hmm, bad news. Original problem has returned. Laptop starts but no video signal on screen or external vga is present. At one point from some reason it started, I got into bios to check again network status but the only option for t is a network boot rom which I enabled but still no presence of it in device manager while in windows, the green(only) light still lights up while cable is inserted.
Meanwhile, im downloading a livecd of knopix.

The gpu is a 216-0752001. Anyone knows if these have problems? I will try to reball it monday when I return to work.

[Th3_uN1Qu3]

That NB/IGP is questionable indeed. However, i've done many of them and they all have one thing in common - very small pads on the mainboard. Maybe you didn't clean it thoroughly and some dirt or oxide was left on some of them, causing an intermittent connection.

The LAN is connected to the southbridge however - i suspect that board may have other issues as well. Has the laptop been dropped?

[Scootie]

That could be, Ill be back next Monday.

[Chieftain]

Network problem is unfortunently from KB926QF... reprogramme (if you have programmer for this) or replace it.

[mcplslg123]

Originally Posted by Chieftain

Network problem is unfortunently from KB926QF... reprogramme (if you have programmer for this) or replace it.

KB926QF is not programmable my friend.

[ktmmotocross]

did u check enabling options in bios?

[piernov]

The last post from the OP was 6 years old.