Wiener Neustadt
Quoted from Quench:I have had a couple of display glass with resistive crud shorts between the pins just after the pins are glued but before the pins enter inside the glass. The crud is hard to get to but can be removed with a small shaped wire/needle to bring them back to working order. Your multi-meter can show the shorts, typically the resistance between good adjacent display pins is around 600k ohms. Pity I don't have a picture handy showing the crud shorts.
Sometimes the NOS glass are more expensive than a working good used complete display.
as it fits that topic and might help someone:
I had a display where the ´dot´segment and the lower horizontal (d) segment would always light together although they should not
The pins for those segments are #10 and #14 - checked for some shorts between those pins outside of the glass but there were none.
Resistance measured was around 70kOhms which was still enough to make them light together-so there was an internal ´short´inside the glass
As there was not much to loose I tried to burn away the internal short-applied 30VDC between the 2 pins. There was a small current in the range of some mA running for a couple of seconds and then stopped.
checked the resistance between the pins-went up to the MOhms range
Resoldered the pins-tested any everything is fine now - no more internal short and every segment working as intended
...sometimes one gets lucky and things work out as intended...
Gilbert, AZ
