No.128 - Agilent U1731A LCR Meter Repair 

This does look like a case of maybe a charged up cap being connected to the input. the worst I've had with zebra strips is the plating on the glass being etched away due to moisture ingress. Don't seem to take much to remove the few atoms of metal on the glass.

I have yet to see a failed repair from you Ian, well done yet again, keep them coming

Nice sleuthing Ian! I thought the same thing as some others. Sooo easy to forget to discharge a cap under test and knacker the "front end". Surprising no resistors popped. Love your skills. Thanks for the content! - jrh

I learn SO MUCH from this video! Huge thanks for great video! Cheers

You might find that BJT transistors used with collector-base junction as a diode may also be for very low leakage, or couse limited by the max base current.

I really must look out for more faulty test equipment for sale. Nice little fix on this LCR meter.

Nice work! I very much enjoy watching your video's.

Nice work!

Might have been interesting to see a before and after IR camera picture.

I prefer a pencil eraser for the first clean above ipa. Fiberglass pen seems too harsh for me. Great repair though, appreciate you showing your thought process.

20:28 ‘…as a bit of a recap…’!!! And a bit of a re-FET!!

very useful video, thanks

Great detective work again Ian…shows how handy an IR camera can be in these situations would the replacement battery cover be a candidate for the 3D printer..?

Excellent work =D

You are a big magician!

Ian, maybe a charged capacitor was plugged into the unit possibly taking out those components. Cheers Eric

you should have as many subs as that Aussie with the big knife by now

Just subscribed thanks for the vid 👍

I find erasers work great on gold contacts without removing the plating.

I guessed the zebra strip for the first failure. But boy, the rest really led a merry chase!

Well done Ian, Ian, how do you go about finding SMD component codes, I have a hell of a time with it. Bob

Not easy but will done.

Nice repair. Don't you have the macrolens for that camera? I can recomment it. It is very usefull. You can get much closer and see individual smd components with it.

I have a 1732B which looks very similar apart from being orange. I think I got it cheap because it had been obsoleted by the 1732C. They seem to have made a lot of revisions and I think they're actually rebranded chinese, not really Agilent. Does anyone know the history ? Good to see you test it before reassembly. I get very impatient with people who seem to completely reassemble things rather than testing in stages.

Hi, Nice video and fix. Where do you find the cross reference for the component codes? I have not found a reliable source to be able to get a translation of these codes. Thanks.

That huge Wima cap in there tho..

nice job....thanks for not filming the soldering/de soldering parts

Nice repair! I'm thinking TEH is right, a charged electrolytic capacitor connected to the input. Did you check the capacitor removed from the board? Always like to know if it was the crapacitor 😊 Regards, David

Who's that funny guy in a hat 🙂

Dirty Zebras were a problem with fluke meters 🙂