Hello, there I had my d255 on a desk auto updating trhough wifi. after 0.5 - 1 hour I looked at it, the display was black. No led light up. Press on/off button : nothing. Tried many "tips" (hold switch down 10sec, 20sec, 1 min ...) nothing. I disassembled it, got the schematic, the mobo layout and tried.
connect the battery. press on/off :
no led light up
usb power turns on (@ C317).
no 5VALWP, no 3VALWP although at the moment of switch press, there is a slight (mV) change on DVM and then back to zero
switch logic working, although the "3VALW" on this circuit is 11V (battery) and droping to 5V when switch press.
I would like to know the actions, measurements, necessery peripherals attached,
during power on
or any other knowledge - suggestion - opinion
many thanks
connect the battery. press on/off :
no led light up
usb power turns on (@ C317).
no 5VALWP, no 3VALWP although at the moment of switch press, there is a slight (mV) change on DVM and then back to zero
switch logic working, although the "3VALW" on this circuit is 11V (battery) and droping to 5V when switch press.
I would like to know the actions, measurements, necessery peripherals attached,
during power on
or any other knowledge - suggestion - opinion
many thanks
Comment