| Electronics > Repair |
| CH341A Serial Memory Programmer Power Supply Fix |
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| majkl21:
I just want to place here some different 3V3 fix which source I found after browsing with Google: https://github.com/OpenIPC/wiki/blob/master/en/hardware-programmer-ch341a-voltage-fix.md It is nicer solution because you only need to cut part of 5V rail, add short wire between C4 and output of 3.3V stabilizer and connect rest of isolated 5V rail to 3.3V. In the source there is slightly different PCB version but after measuring I found that it is quite similar. Modification was checked by programming Atmel 24C01 and Puya P25Q21U with CH341 / NeoProgrammer. Shortly: Cut continuation of 5V rail on the bottom side of PCB (now it goes only to 3.3V stabilizer). On the top side connect now isolated 5V rail part with 3.3V supply via jumper between 3.3V and 5V. Finally connect pin 9 of CH341A equipped with C4 to 3.3V supply (as mentioned in datasheet for 3.3V). |
| sir_cedric_lex:
--- Quote from: majkl21 on February 01, 2024, 08:07:08 pm ---I just want to place here some different 3V3 fix which source I found after browsing with Google: https://github.com/OpenIPC/wiki/blob/master/en/hardware-programmer-ch341a-voltage-fix.md It is nicer solution because you only need to cut part of 5V rail, add short wire between C4 and output of 3.3V stabilizer and connect rest of isolated 5V rail to 3.3V. In the source there is slightly different PCB version but after measuring I found that it is quite similar. Modification was checked by programming Atmel 24C01 and Puya P25Q21U with CH341 / NeoProgrammer. Shortly: Cut continuation of 5V rail on the bottom side of PCB (now it goes only to 3.3V stabilizer). On the top side connect now isolated 5V rail part with 3.3V supply via jumper between 3.3V and 5V. Finally connect pin 9 of CH341A equipped with C4 to 3.3V supply (as mentioned in datasheet for 3.3V). --- End quote --- I just noticed in your second picture (IMG_3050.jpeg) that C5 is a zero ohm resistor and not a capacitor. This might be a factory fault. C5 should normally be the same as C6 with a value of ca. 20 pF since both (C5 and C6) are crystal load capacitors. |
| sir_cedric_lex:
Has somebody here saved the second attachment named ch341aProB+.jpeg from Reply #34 in this tread? It should be a larger version of the shown thumbnail with a size of 1618.03 kB and a resolution of 2557x3300. Reason: Due to a bug, the download button downloads the third attachment (51.99 kB, 1270x738) instead. This might be a shot in the dark but maybe somebody saved it earlier... -> It looks like this, just larger |
| Ian.M:
I just had a rummage through my old PC's temp folders and found this. No promises that its the right file as this forum recompresses image uploads, but it certainly looks*very* similar. I've also uploaded it zipped, so you can see the exact file I've got rather than the recompressed version. |
| sir_cedric_lex:
--- Quote from: Ian.M on March 07, 2024, 06:01:14 pm ---I just had a rummage through my old PC's temp folders and found this. No promises that its the right file as this forum recompresses image uploads, but it certainly looks*very* similar. I've also uploaded it zipped, so you can see the exact file I've got rather than the recompressed version. --- End quote --- Indeed, the image looks almost identical. Thank you very much for all the effort Ian.M! PS: I don't know if it's a problem on my side but I can't open the extracted file with any image viewer on my pc. It might have gotten corrupted before archiving but thankfully the other (recompressed) upload works fine! |
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