Aneng M118A - LCD pinout

A project log for Hack into an existing Multimeter

Using the impact resistant case of a multimeter for your electronics Demonstrated on the design of a Zener-Tester / LED-Vf-Tester

Max SchnorpfeilMax Schnorpfeil 08/01/2021 at 20:470 Comments

Huge challenge is figuring out the LCD pinout. 

Having the knowlege that a DTM0660 chip is used, the pinout of the back-connector can be determined.

That was the easy part. Following is to find out, which combination is connected to which segment...

The LCD screen can be seen as an array. By selecting a COM (common) output and SEG (segment), a specific segment will become black. Of course, driving the segment, should be done with an AC signal so that 0V DC offset is reached. More on that principle can be found in this video of Dave Jones (EEVBlog)