Acer laptop ES1 5Volt missing on USB port. No start up.

Bektronics
Bektronics Member Posts: 3 New User
edited November 2023 in 2020 Archives
Hello friends.
I have a ACER ES1 with board DAOZYLMB6CO Rev: C       OS = WIN 8.1
The laptop has suddenly stopped working without any wrong operation being done with it. No start-up when pressing the start button. Supply voltages after measured on the motherboard and the following voltages are present:
Main rail: 19.5 V.
Start up: 3.3V power button when press going to zero ( = OK)
Chipset: 1.2V
Power is missing on the USB ports, so no 5 volts.
Fan not spinning.
Can someone help me for a schematic diagram and also show me where the 5V power supply is located on the PCB. Nowhere a short circuit. When connecting power supply 19.5 Vdc, the laptop takes 0.02A, which is quite normal. Battery has been removed, as well as RAM and HDD. Normally I have to find the 5V somewhere on the motherboard. All info is welcome. If you have any questions, feel free to ask. Thanks in advance.
BEST REGARDS.

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