A1706 820-00239-A No LED External Only / No SSD

Cire3

Member
A1706 820-00239-A No LED External Only / No SSD

No liquid damage found. No power a the nand. Boots to external screen only, then flashes folder.

U8203 Gets really hot.

PP3V3_S5 Pin 1 - 3.36V
PP3V3_S5 Pin 4 - 3.37
PP3V3_S4 Pin 6 - 0.19V

Best method to isolate PP3V3_S4 ?
 

Cire3

Member
That was helpful, found short in cap C4205. Didn't take much at all. (Had to order)
U8203 cooled down

PP3V3_S4 Pin 6 3.36V now

However now, no display? Gonna poke around, but good progress !
 

Cire3

Member
Must have goofed something up. I do have video.

I have external video Via USB C. Still a flashing folder. Unit is running outside of chassis.

Sorry, also a first responder. So time on this has been sporadic at best this week.
 

2informaticos

Administrator
Staff member
So missing internal video?
In such case, check diode mode to ground at pins 1 & 3 of J8500.

Is the lifeboat connector (J9600) closed?
 

Cire3

Member
Yes, checked J9600 is closed. Appears clean and connected.

unsure of internal video, board is out. Flashing folder on boot. Booted to disk utility, unable to see SSD.

J8500
Pin 1 : 0.314
pin 3 : 0.315

This unit they are really looking for the data.
 

Cire3

Member
Trying to trace SSD Nand power. Schematic shows U5910. I see soldered pads, but missing ?

Doesn't look ripped off?
 

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