Karcher Window Vac | Green light stays on fault | WV2

Thanks to ‪@CatherineHendry-t6e‬ for pointing out in a previous video that the green light on the switch, is supposed to turn off.

Original video:    • This is why your Karcher WV2 Window V...  

Knowing this, I couldn't resist the urge to take a second look at the WV2 and dig deeper into this less known fault.

00:00 Explaining the green light problem
01:05 Opening the Karcher Window Vac T9 torx bit
03:00 Removing 3.7v battery and DC motor
04:00 Testing the circuit board for shorts and voltages
06:48 Examining the switch and LED enclosure
08:50 LED, transistor, microcontroller circuit explained
11:00 Removing microcontroller from circuit. Lifting pin 8
12:39 Checking the NPN transistor for faults
14:00 Replacing SMD BCR108 SOT23 NPN transistor
15:00 Testing the board with the new transistor
15:55 Original battery fitted and tested
16:45 DC Motor installed tested
17:05 Assembling the Karcher WV2 window vac
19:20 Final test is successful

Another mention to user Harox from the Discord server Learn Electronics Repair for his support, confirming my suspicions and finding the correct replacement.

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Tools:
Multimeter: AstroAI Digital Multimeter, TRMS 6000
Soldering Iron: KSGER T12 Soldering Station
Hot air station: Quick 857DW+
Bench PSU: Tenma 72-2540 30V 5A
Digital Oscilloscope: Rigol DS1054Z
Desolder pump: Duratool

Microsoldering set up:    • Micro soldering set up | Microscope s...  

Disclaimer:
The information provided in this video is for entertainment use only.
I am not a professional and any methods I use might not be the correct ones.
I will not accept any responsibility for loss, damage or injury as a result of the information provided in this video.