CH341 disconnects, test clamp not working, soldered bios chip but not erasing/writing how I fixed

[Sparklingx]

Hi,
So i've bough a ch341 programmer, and the chip was CH341B . the test clamp was not working( when connecting bios using test clamp, ch341 device was disconnecting) I tried soldering the bios on the provided board, soldering the bios I could read the chip but could not write or erase. ASprogrammer , neo, ch341a programmer... all programmer software was hanging and device was disconnecting after few second of erase/write operating.
So then I have soldered a capacitor(whatever I had..[10v ~470uf ] ) from VCC to GND on my provided pcb where you solder the bios

now all operations are working well. I dont know if it can corrupt bios content tho or whatever harm it can do. What is your opinion? 🤨

[rogfanther]

If after the modification you can read/verify the contents of the chip, then it´s ok..

But also always check the voltage of the chip, and use (or not ) the correct adapter when flashing.

[Sparklingx]

If after the modification you can read/verify the contents of the chip, then it´s ok..

But also always check the voltage of the chip, and use (or not ) the correct adapter when flashing.

what adapter? I just use the ch341 programmer

[R_J]

You did not tell us the device you are programing

[Sparklingx]

You did not tell us the device you are programing

I am flashing a motherboard bios. I have mentioned "bios chip" on the title.
sorry for not explaining correctly

[harp]

Probably 25Q64FV for HP 450 G1 in picture background...
Always clean clamp contacts and IC legs with IPA, and take care to not wearout plastic spurs.

See thread:
https://www.badcaps.net/forum/troubl...sop8-apparatus

[hoaca388]

what adapter? I just use the ch341 programmer

Bios chip has 1.8v type, 3.3v type so there must be a 3.3v to 1.8v converter.

[Sparklingx]

Probably 25Q64FV for HP 450 G1 in picture background...
Always clean clamp contacts and IC legs with IPA, and take care to not wearout plastic spurs.

See thread:
https://www.badcaps.net/forum/troubl...sop8-apparatus

you are correct 450 g1 but the chip is "MX 25L 6473E"

[Sparklingx]

Bios chip has 1.8v type, 3.3v type so there must be a 3.3v to 1.8v converter.

okk. my bios is 3.3v

[hcx]

Sparklingx Thanks for the tip. I had the same problem. I used a 22uF 16V capacitor and now the programmer no longer disconnects, it works correctly.

My programmer has the marking CH341 on the bottom, not CH341A, and the voltage is 3.3V on pin 28, not 5V.