STM32F103 not programming

[ASakp.1]

Hello i am working on a project which is based on stm32f103c8t6 mcu.

i face a issue while programming some of these microcontrollers.

sometimes some microcontrollers are programmed perfectly while some start giving errors(see attachment).

while going through some forums they suggested to solder the vcc ,gnd,swd and scl pins correctly but even after rectifying the issue still persists

i used this single st-link usb type programmer

can you please help me out

i have even attached the schematic

[Javier1]

• Is this a custom board or one of those bluepills?
• did you tried to "connect under reset"?

[Tesla DeLorean]

Make sure the parts are properly powered. Especially the analogue​ supplies.

The error indicates the devices are working due to power or board construction. ​

[ASakp.1]

It is a custom board

[ASakp.1]

[ASakp.1]

Yes the mcu is getting proper voltage

[Tesla DeLorean]

Ok

Show how this is wired to the ST-LINK you're using.

Perhaps use STM32 Cube Programmer, rather than ST-LINK Utilities, it will show the measured voltage

CN2 left-of-right, STM32 component side

GND, SWCLK, SWDIO, 3V3

CN2 pin side

3V3, SWDIO, SWCLK, GND

The 3V3 needs to go to pin 1 on the ST-LINK 20-pin header, you need a GND,

SWCLK to pin 9, SWDIO to pin 7

Part number unreadable in pictures. Show U1 tight, large and in-focus

[ASakp.1]

[ASakp.1]