(347) 552-2258 [email protected]

A1706 with no display on the touchbar

L

laptopcity

Member
Hi ive got an A1706 820-00239 that originally had a liquid spill back in Feb, i repaired the laptop and its still working :) apart from the touchbar itself :-( , now first of all i thought maybe the touchbar itself got liquid a s well and just gave up so i replaced the touchbar but no luck , the touchbar dosnt show any signs of life that i can see, question is am i going to be trying to solve a problem im never going to get to the bottom off and messing up a fully working laptop (apart from touchbar) or do you think this is fixable, ive had a look at the schematics and im not too sure where to start or IF too at all, would welcome any feedback or if anyone else has had this issue too
 
L

laptopcity

Member
Hi , no signs of corrosion, voltages for j4402 are:
1 = 0v
3=1.3v
5=0v
7=0v
9=1.8v
11=0v
13=0v
15-1.3v
17=0v
19=1.3v
21=0v

then pins:
2=0v
4=1.3v
6=0v
8=1.8v
10=1.4v
12=0v
14=0v
16=0v
18=0v
20=0v
22=5v

and on j4401, pins:

1=0v
3=0.7v
5=0.7v
7=0v
9=0.7v
11=0.7v
13=0v
15=0v
17=0v
19=0v
21=0v
23=0v
25=0v

on the other side pine:
2=0v
4=1.3v
6=1.3v
8=0v
10=1.4v
12=1.8v
14-0v
16=0v
18=3.3v
20=3.3v
22=3.3v
24=0v
26=0v

not sure if that points to anything but im lost :)
 
2informaticos

2informaticos

Administrator
Staff member
You don't have P1V8_S0SW_DFR present.
I hope you checked with touchbar connected; let me know if true...

"18=3.3v
20=3.3v
22=3.3v"
Means DFR_DISP_PWR_EN and PP3V3_S5_T139 are both present.
In such case, P1V8_S0SW_DFR should be present too, coming out from U4404; any short there?
 
L

laptopcity

Member
oooh thanks :) , just to make thing worse its not an 820-00239 its an 820-00923 which i cant seam to locate boardview or schematics, it looks the the 820-00239 do you know if i can use this one instead ???
 
You must log in or register to reply here.
Top