Riccs Posted November 19, 2022 Report Share Posted November 19, 2022 Hello! My name is Riccardo and i have an old DNA250 board that i am trying to recover. The board i think is working ok, it is 5 years old but there are no problems in escribe. I bought a new lipo, 3S 11.1V 1300mAh and 14,43Wh but connecting it to he pc or to a power brick it is not charging. I assume the USB port works fine because eScribe connects to the DNA, and the T-Plug connections works too because the battery gets readed on too. I checked the Fuse continuity and it's 0.0 so the fuse is good. What can i test with the multimeter to see where is the problem? Many thanks in advance! Link to comment Share on other sites More sharing options...
BillW50 Posted November 19, 2022 Report Share Posted November 19, 2022 Looks like the USB charging has been toggled off to me. EScribe's Device Manager bottom right and hit the Diagnostics button and you can set the charging. Give that a shot. 2 Link to comment Share on other sites More sharing options...
dwcraig1 Posted November 19, 2022 Report Share Posted November 19, 2022 If by chance that you have the battery type set to "Power Supply" it would not charge. Check to see that it is set to 3 cell lithium polymer as shown here: Also does the board fire? 2 Link to comment Share on other sites More sharing options...
Riccs Posted November 19, 2022 Author Report Share Posted November 19, 2022 Hello! Thank you both for your quick replies! I went into a shop and we have welded again the micro usb port but with no luck! The port connections are all good but the situation on device monitor is still the same and the battery still doesnt charge. I will attach the battery section on Mod. Using the multimeter tester, which part of the board do you recommend I check to see where the charge is interrupted? Thank you! Link to comment Share on other sites More sharing options...
BillW50 Posted November 19, 2022 Report Share Posted November 19, 2022 That 24 pin (6 pins on each side) square chip right above the USB is the Battery Management IC and is a BQ76925 I think. It controls charging and battery management functions. But if the firmware has it set to not charge, it won't. But I would try an earlier firmware version before I would even be thinking of replacing that chip. I hadn't heard any newer firmware incompatibly problems with older board revisions, but who knows. And you can check this in seconds. 1 Link to comment Share on other sites More sharing options...
Riccs Posted November 19, 2022 Author Report Share Posted November 19, 2022 I did Device Manager -> Diagnostics -> Enable USB charging many times with no luck! I will try an older firmware. How do you suggest me to see if the BQ76925 chip doesnt work? Thank you! Link to comment Share on other sites More sharing options...
Riccs Posted November 19, 2022 Author Report Share Posted November 19, 2022 Update: I downgraded to an earlier firmware version (from sp6 to sp5) and ACTUALLY something changed but still not working. Now from the total 0.0000 of usb power and usb current we are at 0.015 (max) W of USB Power and 0.002 A of USB Current but the charge is still dropping. Do you have more information about the Power managment chip or where to find the codes so i can search it online if its the problem? Also, is there a datasheet with electronic schematic that i can consult? Thanks! Link to comment Share on other sites More sharing options...
BillW50 Posted November 19, 2022 Report Share Posted November 19, 2022 For the specs of the chip, you're gonna have to Google like I would. It's manufactured by Texas Instruments btw. Everyone I know, if they suspect the chip is faulty, they just swap it out with a known good one. It always seems to work. 1 Link to comment Share on other sites More sharing options...
Riccs Posted November 19, 2022 Author Report Share Posted November 19, 2022 I saw online that there are many types of that chip. I think i can see BQ76925 TI [something unreadable] AXH4 on it but i am not sure. What do you think about the new values of USB power and current? Do you think it could be something other than the chip? Link to comment Share on other sites More sharing options...
Wayneo Posted November 19, 2022 Report Share Posted November 19, 2022 Does it fire? Have you tried different cables? Plug it in, and let it sit for a minute. The board does not start charging immediately after being plugged in. Down in the bottom left hand corner (Device Manager) where you see stealth, locked ....... you'll also see charging (if it is). Link to comment Share on other sites More sharing options...
BillW50 Posted November 19, 2022 Report Share Posted November 19, 2022 17 minutes ago, Riccs said: I saw online that there are many types of that chip. I think i can see BQ76925 TI [something unreadable] AXH4 on it but i am not sure. What do you think about the new values of USB power and current? Do you think it could be something other than the chip? The AXH4 stuff is version, lot, etc numbers. So those are not important as far as replacement. The new values of USB power and current is what I would expect from the older firmware. And yes, I do think it is a failed chip. 1 Link to comment Share on other sites More sharing options...
Riccs Posted November 21, 2022 Author Report Share Posted November 21, 2022 Do you by chance know which is the version of the chip? Is it BQ76925RGER or BQ76925RGET? I am trying to get a new chip but at leadt i want to be sure about it, thanks again! Link to comment Share on other sites More sharing options...
BillW50 Posted November 21, 2022 Report Share Posted November 21, 2022 You want the square (not rectangle) BQ76925 24 pin IC. You are very unlikely find a RGER or a RGET after it. Since that was just for that particular production run. And that one the charging failed! So why would you want one from the same production run? As another one from the same run may likely fail the same fate. 1 Link to comment Share on other sites More sharing options...
Riccs Posted November 21, 2022 Author Report Share Posted November 21, 2022 I admit to having the same doubt as you, but unfortunately I cannot find any information about a BQ76925 24 pin chip (square) that is not RGER or RGET.. Also i really want to work so at least i want to be sure about which of the two i need to order.. Link to comment Share on other sites More sharing options...
BillW50 Posted November 21, 2022 Report Share Posted November 21, 2022 Here's the PDF of the BQ76925. Either RGER or RGET will work fine. What's the difference? I believe only Texas Instruments only knows. https://www.ti.com/lit/ds/symlink/bq76925.pdf 1 1 Link to comment Share on other sites More sharing options...
onnyteam Posted September 14, 2023 Report Share Posted September 14, 2023 В 21.11.2022 в 23:44, BillW50 сказал: Here's the PDF of the BQ76925. Either RGER or RGET will work fine. What's the difference? I believe only Texas Instruments only knows. https://www.ti.com/lit/ds/symlink/bq76925.pdf Thx you! 😘 1 Link to comment Share on other sites More sharing options...
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