There's a version 1.6 of the ch341a where the voltage issue has been corrected (as of Feb 2022). But I see a lot of eBay listings for the new revision with pictures of the old one, so buyer beware. Always a fan of ur bios content. Thanks!
Hi, excuse me for reviving such an old thread. I have to flash a W25Q32BV chip, that operates at 3.3V. I have no access to buy a 1.6+ version of the CH431A, but the CH341B version, will this version work without riks? Thanks
Unnecessary modification....once connected to 3.3 v bios IC, the volts drop from approx 5 volts to approc 3.3 colts. Modding makes this unit unreliable
Dear sir. I have to flash a W25Q32BV chip, that operates at 3.3V. If i buy the CH341B version, will it be safe for this chip? no mods to the programmer are recommendable? Thanks, i have no soldering skills.
Did this mod and somehow my CH341A made a "sizzling" sound for a few seconds, think something was shorted... it's dead now after a few reading attempts, tho already ordered a new and better programmer.
There's now a new PCB version which has 1.8V, it would be good to look at it. Most BIOS chips on MBs are nominally only 1.8V anyway and only accidentally 3.3V tolerant. By the way there's anecdotal experience of people mindlessly plopping the test clip in 3.3V mode onto 1.8V chips and they're fine, no heat no anything, like what? Colour me surprised, but apparently they are feisty little bois. That X79 has only a 64mbit one? I wonder where they dug that out, i thought 128mbit was common for the longest time. And 3.3V as well huh. Something to keep in mind that the pin source/sink current that CH341a can muster is RIDICULOUSLY low, like 200uA. These will be easily dissipated by ESD diodes on the target chip clamping the real pin voltage to VCC+0.5V, and you don't really need to expect long term damage to the target chip due to this. I'd be really more concerned for whether CH341 will survive that, it's a spectacularly wimpy chip. I understand that it's chip made for and under cost pressure, but it's basically made out of leftover snot. Exceeding VCC on the pins is however not particularly safe for CH341a, which is probably why they went this route of always feeding it 5V.
Hi can you pls help me what programmer you will recommend to flash bios chip MX25L3206EPI-12G This programmer is a trash i did this but still i get data line 3.1v i wanna buy other programmer
There is actually nothing wrong with the programmer. If you look at those 5V pins with an Oscilloscope you will find it is actually pulsed waveforms sitting on those pins. The current on those pins are very low so it cannot damage your BIOS chip. Measuring the voltages while programming the chip you will find it dropped to 3,4V and those pins can accept volts up to 4.2V. I have programmed a few chips without any problems just as it is,out of the box. You can also watch this video which confirms what I have found. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-J8-Sh7DjiXw.html
Unnecessary modification....once connected to 3.3 v bios IC, the volts drop from approx 5 volts to approc 3.3 colts. Modding makes this unit unreliable
