Hantek 2d72 shorted live to USB ground

dancho

I have shorted the scope, live to ground USB. Unit will not turn on. Chip HM4052 (U6) is shorted and blown, pin 2 is smoked. It receives 3.9V from battery (pin 6) but output (pin 1) is low voltage and the chip gets hot. Disconnecting HM4052 pin 1 by removing R17 (0 Ohm) from U6 (DC-DC converter TLV62565) removes the short to ground. Please advise. In your experience, do I need to order and replace anything other than HM4052 / ETA6002? Schematic PDF

amy

Please test the 3.1V voltage.



If there is no 3.1V, the microcontroller may be broken. The model of the microcontroller is STM32F103VET6.

amy

It should only be necessary to replace HM4052 / ETA6002.

dancho

ETA6002 replaced
TLV62565 replaced
power line M3.3 (3.11V) is present
After it, it reads as short, consumes ~250mA but nothing gets hot. M3.3 goes directly to arm apm32 f103vet6.
The power led is solid RED and the unit does not turn on.
Please, do you have any ideas about further repair? Thank you.

dancho

Thank you for helping!
5V - YES
4.5V -YES
3.1V - NO!
3.1V comes when i remove the resistor,  shown in the picture.
original usb cable is broken too.

Shuld I order a couple of STM32F103VET6 for replacement?
Thank you very much!

dancho

Original usb cable is black on the inside and the pin on the right is missing. The cable has become a fuse!

dancho

STM32F103VET6 replaced, short is removed.
The new chip does not want to connect over TTL to be programmed. Not recognised by 'en flasher stm32' or not in flash mode.
Is it possible for some other components to be damaged? Or am i not flashing it the right way?
LED blinks red when no battery is connected. Solid red when connected battery.

Jing

dancho replied at 2022-12-28 06:34
STM32F103VET6 replaced, short is removed.
The new chip does not want to connect over TTL to be prog ...

Dear Sir，
Can the machine be turned on normally now? What exactly is the machine now? If possible, please provide relevant videos for our better reference.