Electronics > Repair

Troubleshoot Milwaukee 18V Charger

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vidarr:
My charger for my drills stopped working. I need this thing for work. The voltage coming out is very unstable 5V max on one of the terminal fins. The others are around zero to just a couple volts, also fluctuating. I tested to make sure the AC was coming in and it is. After that, I was just guessing and poking around with the DMM; that lasted 20 mins. I did watch some videos, but nothing was helpful.

All of the components seem to be in good condition visually--- except for a diode that looks odd. There are no signs of anything burning out, or smoke releasing though. I know what all the components are more or less. I just need a jump start on where to begin, or maybe there is something that I should start with after the input/output.

Sorry the pics are bad.

Thank You!

edit: The pictures got rotated in the wrong direction by the website.

fzabkar:
Can you identify the markings on the ICs on the solder side of the PCB?

vidarr:
Two of them are legible. The third appears to have no markings. There was a layer of some type of glue dabbed on the top of each one that I carefully scraped off.

F2001
08KG4
ATHNO
(HTSSOP14 ic chip? or IC MCU 16BIT 1K FLASH 14-TSSOP? ---- Brown-out Detect/Reset POR PWM WDT)

D413A
BA1219
(P-Channel MOSFET Transistor)

The third one has 8 pins and looks like a timer. IDK what it actually is though.

THANK YOU!

fzabkar:
AOD413A 40V P-Channel MOSFET:
http://aosmd.com/pdfs/datasheet/AOD413A.pdf

MSP430F2001 16MHz MCU with 1KB Flash, 128B SRAM, timer, comparator:
https://www.ti.com/product/MSP430F2001
https://ae01.alicdn.com/kf/HTB1FpgOsxWYBuNjy1zkq6xGGpXa6/50-MSP430F2001IPWR-F2001-MSP430F2001-TSSOP14.jpg (photo)

Maybe this application note would help to visualise the circuit? There is a "Block Level Schematic" on page 3.

Li-Ion Battery Charger Solution Using an MSP430 MCU (Rev. B):
https://www.ti.com/lit/pdf/slaa287

floobydust:
A common problem with the Milwaukee chargers is the cheapass electrolytic capacitors, the bottom tier CapXon, JWco etc. Like the 10uF, 47uF parts I think.
Just replace them, before you blame the IC's. The brownish glue is known to turn conductive with age, so scrape it off from HV areas.

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