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Anyone know what chip is used to drive the display. The builder burred it out so noone could replace it and mine is acting up and Probe 2 doesn't function. I tried calling them and the builders son said to email them but I can see that this thing is going to take a long time because the mom is running it apparently and just doesn't seem like a priority at all.
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You did try all the usual things first checking connections on lcd to board. And checking inside probe 2 jack and the trace? You might try if you haven't.Originally posted by Amp Kat View Postsoldering stuff that's broken, breaking stuff that works, Yeah! -
Yeah I prolly will end up fixing it but I really don't have time so was going to send it in but looks like I don't have a choice. I found the 10 ohm current sense resitor was blown on the socket so maybe that's all it is.KBComment
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Well that is why you posted wasn't it? To fix it rightOriginally posted by Amp Kat View Post
soldering stuff that's broken, breaking stuff that works, Yeah!Comment
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Actually the guy said they would probably give me a refurb and said they didn't charge to fix them which is pretty cool however getting this to happen timewise is prolly why they do that because there is nothing fast about this operation so yeah I guess you may be right. lolKBComment
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The ICL7106 and 7107 are popular digital meter chips. One of those would be my first guess. The other possibility would be a custom programmed microcontroller, but then there would be no need to grind the part number off.
However, if the meter IC were blown, both channels would be dead, as it's shared between them. It's more likely that whatever surge took out the 10 ohm resistor, also went back into the main unit and took out a couple of components.
I would add a TVS diode in parallel with the 10 ohm resistor to stop it happening again."Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"Comment
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Think you are spot on as usual Steve and thanks. I do agree that it didn't make sense one side was working and not the other as far as the chip goes. I did replace the 10 ohmer and will test tonight. The second probe still doesn't work so I'm thinking the connector may be the issue because besides the chip there really isn't very much there but a few resistors and a few zeners and they are all good.KBComment
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Have you actually talked to Randy? He's always been pretty good about repair stuff.Originally posted by Amp Kat View PostComment
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