Electronics > Repair

CH341A Serial Memory Programmer Power Supply Fix

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impetus_maximus:
was this mod ever really necessary? i purchased a KeeYees SOP8 SOIC8 Test Clip and CH341A USB Programmer recently. when not hooked to a chip, it has 5v on the data(?) line. after connecting it to a video card BIOS chip, the pins that were 5v now show 3.5v

so, was this a case of early version issue or was it one person checking the open voltage and everyone freaking out?  :bullshit: :scared:

DavidAlfa:
You're forcing the pins to clamp the voltage coming from the ch341, it's up to you to "freak out" or take the risk.
But one day you might want to read some important memory and get a surprise.

coromonadalix:
some infoes here

need registration i think  or password to unarchive them ?

https://4pda.to/forum/index.php?showtopic=884713&st=7440

neoprogrammer
https://forum.laboneinside.com/viewtopic.php?f=35&t=76

asprogrammer  i think replaced by neoprogrammer
https://github.com/nofeletru/UsbAsp-flash/releases

impetus_maximus:

--- Quote from: DavidAlfa on June 16, 2023, 07:38:51 pm ---You're forcing the pins to clamp the voltage coming from the ch341, it's up to you to "freak out" or take the risk.
But one day you might want to read some important memory and get a surprise.

--- End quote ---
i see. it's my understanding the programmer limits the current. now i'm hoping to find scrapped chips to see if i can read, then possibly kill one with it.  :-/O


--- Quote from: coromonadalix on June 18, 2023, 01:33:21 am ---some infoes here

need registration i think  or password to unarchive them ?

https://4pda.to/forum/index.php?showtopic=884713&st=7440

neoprogrammer
https://forum.laboneinside.com/viewtopic.php?f=35&t=76

asprogrammer  i think replaced by neoprogrammer
https://github.com/nofeletru/UsbAsp-flash/releases



--- End quote ---
thanks

DavidAlfa:
Killing chips is rare, but do you really want to take the risk?
Furthermore, the modification is really simple.

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