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Fluke 179 missing segments on the diplay
woof:
I bought this multimeter used here in Germany a few months ago. It was sold to me as new, and I have not used it much, it even still has the protective film. Today while measuring a resistor in Mega Ohms I noticed the "M" symbol on the display missing. I was confused. I researched and found out that holding the Hold button and turning the selector to VAC displays all the segments. The M symbol does indeed not light up... In addition, I found out that many other segments don't light up either! Fairly disappointed in this finding. I'm a first-time Fluke owner and I am wondering if this is a common issue with Fluke multimeters? Is there a way to repair it without sending it to Fluke service?
I have attached some photos.
HKJ:
It is most likely a problem with the connection between the display and the circuit board and that is done with a zebra stripe. You may be able to clean the contacts between the stripe and the circuit board/display with some alcohol.
woof:
Unfortunately cleaning the zebra strips and the contacts did not resolve the issue. All the mentioned segments are still dead... :(
J-R:
--- Quote from: woof on September 06, 2024, 10:32:30 pm ---Unfortunately cleaning the zebra strips and the contacts did not resolve the issue. All the mentioned segments are still dead... :(
--- End quote ---
When disassembled, if you press on the connections, do the segments show up?
Also, try flipping/rotating the zebra strip to see if different LCD segments start/stop working.
robert.rozee:
carefully examine the pins of the IC that is driving the LCD, using a magnifying glass. likely you will find that one of the pins is unsoldered. a technique i've used in the past is to drag the sharp end of a needle across each of the four rows of pins with light tension on the needle so you can hear a series of 'pings'; there will be a distinctly dull ping on any unsoldered pin.
apply a little liquid flux to the unsoldered pin, reheat with an iron, and remove any bridges with solderwick. you should not need any additional solder.
cheers,
rob :-)
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