Electronics > Repair

CH341A Serial Memory Programmer Power Supply Fix

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camber:
Good point. The datasheet is in Chinese but as far as I can tell there is no write protect pin.
I resoldered every joint. I measured every component and is OK. I will order another board.

Roland_W:
Hi All,

I bought a black CH341A and made the modification to use it with 3.3V, and 5V signal. I add the goldpin to power supply selector 3.3V or 5V.


Below the SPI signal measure using the saleae.com logic analyser 3.3V interface
 Screenshot 2022-08-25 143137.jpg (206.61 kB. 1334x1092 - viewed 925 times.)

Below the SPI signal measure using the saleae.com logic analyser 5V interface
 Screenshot 2022-08-25 143314.jpg (138.45 kB. 1155x1060 - viewed 690 times.)

Chamara Electronic:
I find the problem of some ic not responding

Error message is IC not responding

This is video i made about,

https://youtu.be/Ooe0mcnHb5M


Georgdew:
Hello Roland_W . Some of my opinion,explaining from your picture which I have modified below..
It was unnecessary to cut the threshold from U1 to C1 Capacitor. You will use 3.3V and 5V on the same capacitor, you will have an unstable fluctuation.
3.3V and 5V have separate capacitors, that is C2 and C1..Which means that each capacitor has different ratings (its own ratings) for different Voltages...
See my Mod in the next comment..

Georgdew:
My modification:

Tested and working properly..
1.Reading bios dump file
2.Deleting the bios chip dump file
3.Writing the bios dump file

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