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Hi.
Few months ago I bought Hantek 6254BC PC USB Oscilloscope, PCB DSO6XX4 V1.08, S/N:64C08762.
I accidentaly while measuring some power device haven't disconnected power supply from laptop.
USB Port was blown and HT6254BC damaged.
After measuring U907 had short circuit, U19 and U4 had no output voltage.
I replaced all 3 SIK sot23-5 converters, so after that +1,25V, +1,8V, +3,3V came back.
There's still some issue because after connecting device is not recognised.
I did some measurements:
Tp11 +4,830V; Tp5 +4,815V; Tp4 +4,633V; Tp10 -4,495V; Tp18 +1,579V; "+1,25V" +1,258V; "+1,8V" +1,802V; "+3,3V" +3,307V; "3V3" +3,307V; Tp14 +3,214V.
After connecting to USB diode D11 light for a while, diode J5 light red then very short green and then blinking red.
Please some advice about further examining and reapairing.
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