trying to fix Philips toothbrush 4100 (HX369BK)
The battery started draining quickly.
After disassembling it, I discovered that the motor gets very hot when brush is off, which is apparently causing the battery to lose charge.
The motor is connected to contacts M1 and M2.
When I turn on the brush, 0.4V appears on these contacts, and the motor starts running as expected.
But when I turn off the brush, the voltage changes to 3.8V—exactly the same as the battery.
The motor gets so hot you can't touch it. And after 5 minutes, the battery drains to 0V.
(To charge it, I unsolder the battery's positive terminal and charge it using a TP4560)
That's why I noticed this 6-pin chip (pin 1 also shows 3.8V)
I think it's some kind of LDO or something. Maybe it needs to be replaced so that the contacts don't show such a high voltage when off?
chip marked - 8517C
Please help me identify this chip so maybe I can order it and replace..
The battery started draining quickly.
After disassembling it, I discovered that the motor gets very hot when brush is off, which is apparently causing the battery to lose charge.
The motor is connected to contacts M1 and M2.
When I turn on the brush, 0.4V appears on these contacts, and the motor starts running as expected.
But when I turn off the brush, the voltage changes to 3.8V—exactly the same as the battery.
The motor gets so hot you can't touch it. And after 5 minutes, the battery drains to 0V.
(To charge it, I unsolder the battery's positive terminal and charge it using a TP4560)
That's why I noticed this 6-pin chip (pin 1 also shows 3.8V)
I think it's some kind of LDO or something. Maybe it needs to be replaced so that the contacts don't show such a high voltage when off?
chip marked - 8517C
Please help me identify this chip so maybe I can order it and replace..
Attached Files
if you find these attachements useful please consider making a small donation to the site
