I bought two ISDT Q6 Plus battery chargers over some months, and they both quickly developed the same fault symptoms:
- jog wheel unreliable / skips; and
- jog switch unreliable, eventually failing totally.
The worst one was disassembled. These are build a bit like mobile phones, the manufacturer did not want them being disassembled.
Here are pics of the evidence of the problem.
Above is the component side of the PCB, the right hand side is opposite to the rotary encoder for the jog wheel. The PCB around the hand soldered terminals of the encoder has a large amount of flux residue which is usually corrosive to a greater or lesser extent. Over time with atmospheric humidity, this spreads wider and wider, and in this case has penetrated both the encoder and the switch which is to the right of the PCB opening. Continue reading ISDT – Chinese junk