Easynote TK83-SB - blown AMD chipset replacement gone wrong - the nitty gritty.

[amyk]

Ok so i took screenshots of pins 15 to 20.
Can't really make the scope show anything more than that but maybe it will be enough to give some ideas.
Also you can see some flat spots in the signal in some screenshots, these flat spots are present on all pins that show a signal but are hard to catch for a screenshot.
15 - LCD_TXBOUT2-
16 - LCD_TXBOUT2+
17 - LCD_TXBOUT1+
18 - LCD_TXBOUT1-
19 - LCD_TXBOUT0+
20 - LCD_TXBOUT0-

500us/div?

These signals are in the hundreds of MHz range (i.e. edge-to-edge times are only a few ns), even 500ns/div is too slow to see much of anything...

If your two schematics are the right ones, I'm surprised you even got it to display anything at all because the pinouts are almost completely different, and the LVDS lanes don't even match (not even the clock.)

Code: [Select]

13 CLK+     OUT0-
14 CLK-     OUT0+
15 OUT2-    GND
16 OUT2+    OUT1-
17 OUT1+    OUT1+
18 OUT1-    GND
19 OUT0+    OUT2-
20 OUT0-    OUT2+
21 GND      GND
22 USBDM    CLK-
23 USBDP    CLK+
And I'm pretty sure if it had a webcam it's fried now, with the full system DCBATOUT being applied to the 3V and USB lines...

[Refrigerator]

I already knew that my scope was not good enough to show the LVDS signal, but i took the screenshots anyway just to show that there is something.
Well, the screenshots are not relevant anymore anyway since i found my main problem.

[Refrigerator]

I rewired most of the connector and after plugging it in i saw absolutely nothing.
Then when i started buzzing out connections with my DMM i found out the the ground connections are not right on the PCB.
Turns out i had found the wrong schematic. 
Here, this one should be the right one, page 23. 
https://www.rom.by/files/acer_5551g-5552g_la-5911p_www.mycomp.su_.pdf
Well, i only rewired the data lines, and not the power lines, so no real damage was done.

By the looks of it the only difference between the two is that on the packard bell the LOCAL_DIM and COLOR_ENG_EN pins are marked as inputs rather than outputs.