Multimeter Repair, Metex M 3650 1989, Part 1

I begin with a bit of history. Then introduce basic Liquid Crystal Display (LCD) operations, remove a hybrid package (Metex SDG-HD-03AR), and then remedy an unreliable selector position.
I finish up Part 1 with a bit of tinkering, measuring LCD pixel\element Capacitance.

[@agramcroatia4185]

This is a multimeter. I have had it since 1988. Precise and unbreakable, and I use it often.

[@rickd6657]

Thanks for sharing your knowledge. I have the 1994 version (grey casing) briefly shown at the beginning of the video - purchased at Dick Smith. Because of the name Metex, I mistakenly though it was German...hehe. It's got pat. pending US and Germany on the back. I like this 25yo meter although it's only 2000c (3-1/2 digits). Recently it developed a fault with reading AC voltages. Measurements on all scales were ~30% off. e.g. 178v reading for 240v mains. The ADC chip works on VDC only so VAC first needs to be converted and scaled. The designers couldn't fit all of the circuitry of the AC-to-DC converter on the main board so they resorted to using a vertically mounted extension PCB, naming it ADC-HD-201CR. Luckily the fault turned out to be caused by 2 bad 10 uF/16v caps (C6 & C9 on the main PCB). The approach used was to test the main board components of the AC-to-DC converter in-circuit, and then remove and re-test the ones with no or suspect readings. I'm glad I didn't have to go through the trouble of removing an extension PCB like you need to do. Finding your videos helped me repair the meter.

[@stuffi1970]

Hi Richard.
I got a meter like this and demaged it yesterday. ;-(
Wanna test a Animalfence Powerdelivery Device.
I select the wrong Contacts and so goes the full Power of 6000V Highvoltage in the M 3650... ;-(
The set whas 200V AC.
Since that, the Display show nothing more and when i turn the Powerswith on it only beeps continiously.
Is there a Chance for repair, or should i better by a new one?
Thanks... Mario

[@fbands]

Hi Richard, I just saw your video and I have a meter like this that felt down and the LCD broke. The it was working perfectly but now this part is damage. Where can I find this LCD Display?
Thanks for the video

[@richardrudek01]

Unfortunately, no... and you're welcome :)

[@josea.esteve7805]

Que tal, se me estropeo mi tester Metex, no me mide el microamperimetro, no cambia la escala. No se si peda ayudarme