| Electronics > Beginners |
| Will replacing battery controller IC fix laptop? |
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| skillz21:
My Acer R3 laptop broke last year. I had a look at it today, I had already torn down the battery and repurposed it, but I still had the protection circuitry. I cut off the wires connecting the battery and motherboard and instead connected a 15v DC power supply to the positive and negative terminals. When I connected it, the motherboard drew over 5 amps from the supply, and the voltage dropped to 2 or so volts. Something was obviously broken. (The laptop broke for some unknown reason, when I tore open the battery, the protection circuitry had already kicked in, probably because of the short) I don't have a thermal camera, so I looked on the motherboard and found an IC near some inductors. I googled the part number, (the markings on it said: BQ 737 - TI 56I - AQ8T (the hyphens represent a new line)). After looking around, I discovered that this was a battery charge controller (Success!). As I said earlier, I don't have a thermal camera, so I connected the power supply once again, and placed my finger on top of the IC. Sure enough, after a few seconds, the IC heated up. (I got the right chip on the first try, I'm not sure why it took me literally a whole year to try this) Here's my question, will replacing this IC fix the PC? The initial problem was, this laptop randomly just stopped booting after a shutdown, the charging LEDs wouldn't light up when I connected the power adapter. I found this IC on eBay, but the only problem is, (here's an example) I didn't find an IC that matches the original IC exactly, the ones on eBay say: BQ 737 - TI 25I - ACD8. I'm not sure whether replacing the original chip with this one would work... I'd appreciate some advice on what to do from here. Thanks |
| HecticZA:
--- Quote from: skillz21 on May 19, 2018, 11:53:09 am --- Here's my question, will replacing this IC fix the PC? --- End quote --- Is the short gone whithout the IC? If not, you will have to troubleshoot a bit further. Sent from my SM-N950F using Tapatalk |
| skillz21:
--- Quote from: HecticZA on May 19, 2018, 01:19:16 pm --- --- Quote from: skillz21 on May 19, 2018, 11:53:09 am --- Here's my question, will replacing this IC fix the PC? --- End quote --- Is the short gone whithout the IC? If not, you will have to troubleshoot a bit further. Sent from my SM-N950F using Tapatalk --- End quote --- How exactly do I test this? Do I need to desolder the IC? (I mean, I would assume that this IC is the problem, since it's the one that heats up... Then again, my knowledge of electronics isn't that good, so I'm not sure) If this IC was the problem, would those ones on eBay even work as a replacement? since they don't have exactly the same markings? |
| nuno:
You can find a few videos on the subject, for example |
| Spudlicious:
My repair experience would suggest that a hot IC is probably a good one. They die cold just like us. |
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