HUION H420 USB PEN TABLET: PEN NOT WORKING. SOLVED

Hi all, been using this USB pen tablet HUION H420 for online teaching for almost a year now. 

Although it is cheap (RM76), this drawing tablet very helpful to me whenever I am making an online class.

However, last week, suddenly this tablet stopped working for some unknown reason after my kid uses it for drawing.

Troubleshooting:

Trying several things to solve the problem...

1) Change battery. still not working

2) uninstall the software and reinstall- still not working

3) change USB port location- not working

4) change USB cable - not working

5) replace pen tip - also not working

6) Follow some setting suggested from the internet - not working too

and several other possible solutions from the internet and I am almost giving up.

*Then found one Youtube video which suggests removal of the pen casing, to have access to the internal circuit. This might be helpful as I can observe the circuit condition inside the pen.

.

After casing removal and observing the internal circuit, I found out that one of the winding got separated (detached) which disconnect the circuit.

Almost purchased a new pen, but luckily found out the root cause of the problem.

Solution:

Once found the main culprit behind a non-working pen, then we can fix it. The first thing to do is to try to solder the loose wire together (reconnect the broken wire) as shown in the picture with the hope that pen will work again.

Outcome:

After the wire is soldered, provides the connection to the battery, the tablet pen seems to be functioning again. It's working again..yeah...



Some observation

copper wire seems to be easily broken when touching the plastic body. So, it is best to cover both copper wire with thermal tape to cover it from getting rubbed by the casing.


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