LPC1769

[syydmml]

Neither j-link nor isp serial port can be used to burn lpc1769, and the circuit is normal. I changed the previous lpc1769 that can be burned to the circuit board, and it can be burned normally. I made 10 pieces of samples, and all the lpc769 above can not be burned normally.

[Pavel_Hernandez]

Hello, my name is Pavel, and I will be supporting your case, could you tell me more about your setup, do you have the MCUXpresso? maybe you could try to do a mass erase. 

Let me know if you need more help.

Best regards,
Pavel

[syydmml]

These chips have been unable to connect successfully, does this mean that the chips are damaged? If not, is there any way to determine if the chip is damaged

[syydmml]

Using isp serial port burning is also unable to connect successfully, and I found that the rx and tx pins are not voltage. I have a chip used before lpc1769 can be successfully connected, using isp and j-link can be

[Pavel_Hernandez]

Hello, I suggest reviewing the next information the TCK must need a pull-down.

Design Considerations for Debug - NXP Community

Best regards,
Pavel