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How to take apart Voltcraft/Metex 3650B
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retiredcaps:

--- Quote from: j-man on January 12, 2015, 12:53:08 pm ---Any suggestion will be much appreciated.

--- End quote ---
Can you post pictures of the insides of multimeter?  Something like what I did in this post?

https://www.eevblog.com/forum/repair/metex-m-3610-repair-help-dmm-won't-zero-properly-in-ohms-and-dc-volts/
j-man:
Here are the pictures.
The IC - Maxim MAX130CPL - is under the LCD display, in a socket. I checked it and I didn't notice any sign of damage or dirt, so I put it back in its place for now.
There are two pictures of random measurements: with one probe shorting COM and V/?, the display moves alternatively from "overrange" and random values  :-//
retiredcaps:
The grey spark gap between the V and COM jack should read open circuit when measured with another meter when set to resistance/ohms mode.
retiredcaps:
Can we get a close up shot of those two blue components by the V and COM jack?  I can't make out what they are because your picture is too dark.
retiredcaps:
The component circled in red here might be a PTC?  I would know for sure if I could only find my board?  :palm:

If it is a PTC, I think it should measure around 1k ohm.
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