Macbook Pro 13 820-01987

[ielectron]

Hi everyone,
I have an issue with this machine, laptop was after liquid damage and it was fixed works fine for over year no issues.
two days ago Touch Bar stopped working, first touch didn't respond and after reboot display was gone too.
Tried Pram reset no luck.
the liquid damage was around backlight IC u8400 also around the PPVout caps this all works fine since repair.
tried 2 new Touch Bars also didn't resolve issue
replace both J5100 J5110 hoping this will help no luck
checked the voltages
PP1V8_DFR present
PP3V3_G3HSW_DFR present
J5100 SPI resistance
spi_dfr_cs_l 5,15Mohm
spi_dfr_mosi 5.15Mohm
spi_dfr_miso_r 121.2 Kohm
spi_dfr_clk 3.91Kohm
Some voltage is coming up on this lines too.
I've also checked relevant resistors they are also seams to be okay.
Any ideas what should I look for more?
Thanks

 

[2informaticos]

First, forget to check in ohm scale for data lines; use diode mode instead (red probe at ground).
Switch to ohm scale for very low resistance detected.

Check other touchbar signals, not just power (LID, RESET, DETECT); compare with good board, if possible (touchbar connected).

 

[ielectron]

Thanks for fast response
I take a readings with diode mode from this 2 connectors:
I don't have another machine like this to compare
diode mode readings on J5100 connector
1,2,3,4 OL
7-480
8-470
9-430
10-480
13-470
14-468
15-464
16-465
18-463
19-OL
20-514
21-514
22-404

J5110
3-515
4- OL
5-509
6-466
9-509
10-465
11-507
12-462
15-508
16- and
17-510
18-ol
19-gnd
20-ol
21-466
22-ol
23-466
24-gnd
25 -gnd

 

[2informaticos]

"Check other touchbar signals, not just power (LID, RESET, DETECT)"
I meant voltage levels.
No problem if you post voltage for all pins; diode mode readings didn't show strange values.