820-00850-A no display on internal or external screen

joshAU

Member
Hi again.
I get 20 volts to F3001 when connected to the outer USBC port on J3300.

The trackpad clicks, so the unit is turning on, but there is no display.
The power button will turn the unit on and off - i.e. the clicking will stop, or start, again.

There is no signs of any liquid ingress to either side of the logic board.

I've tried with an external monitor with the internal screen disconnected, using a known-good USBC-HDMI adapter.
I've also tried with a known-good panel.

Not familiar with this board.
Any help appreciated as to where to start this one.

PPDCIN_G3H = 20.30v
PPBUS_G3H = 12.57v
PP3V3_G3H = 3.36v
PP5V_G3S = 5.14v
 

2informaticos

Administrator
Staff member
Trackpad click is not life sign on new machines.
Remember to check for USB activity; is the best way to confirm if board really boots.
Check at least CPU core voltage; should drop after 10-15s to aprox 0.6V.
 

joshAU

Member
Ah, OK.
I had assumed that the trackpad click was a sign of life on all of them.
Plus the fact the power button would seem to turn the trackpad on and off.

However, no signs of life from any USBC port with a USB with a LED on it.

PPVCC_S0_CPU = 0v

PPBUS_HS_CPU = 12.56v
PPVPCORE_S5 = 0v
PP1V8_S5 = 0v
PPVCCGT_S0_CPU = 0v
PPVCCIO_S0_CPU =0v

I guess dead?
 

2informaticos

Administrator
Staff member
You've wasted time testing with abother panel, when your machine doesn't even get S5 voltages.
Until S0 is long way...

Try DFU revive.
 
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