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870-01779 turn on but only backligt comes up then switch off in a loop

Dozer

Dozer

Member
hello,

I got this machine.

all LEDs to see one by one. after turnes on last led backlight switches on holds a second then turns off completly , all leds off and start again...

ssd has 2.5V

DFU possible to see , revive is not working because I think of the bootloop. It ends up with the dashed box and then with a lock icon. but there is nothing new realy installed.

I dont know where to start here. I think the power unit and Display should be ok, Bootloop is also without display (except the last led of course)


I had from Harald the USB Tester and I can see the blinking green light before all turns off. Need some help here please
 
Dozer

Dozer

Member
customer said turned off and was not able to turn on again

The unit appears to enter a repeating power-on cycle. After connecting the power supply, LED 1 comes on. The 12 V supply rail remains stable throughout the entire sequence when checked with an oscilloscope.

When the power button is pressed, LEDs 2 and 4 briefly illuminate, then switch off again. Next, LEDs 2, 3 and 4 come on, so all four LEDs are lit for a short period. After some time, LEDs 2, 3 and 4 switch off, followed by LED 1. LED 1 then comes back on and the entire sequence repeats.
 
Dozer

Dozer

Member
I tried that. I can enter DFU mode normally, and the process runs through until the lock symbol appears. After that, however, nothing changes, unfortunately.

I have also already tried replacing the power supply, but that did not help either.
One additional note: the tests I described above were performed without the display connected.

With the display connected, of course five LEDs light up instead of four, as I previously wrote/reported.

The behavior is still the same as described at the beginning: the backlight comes on briefly, which is still visible, then everything shuts down and the process starts again from the beginning.
 
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