Author Topic: Bad IC's experience.  (Read 367 times)

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Offline powerchisper

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Bad IC's experience.
« on: February 15, 2019, 07:04:19 pm »
Hello friends.

Sometimes you can find bad chips that show no external signs of damage, but ...How often does it happen to you ?
I am currently repairing  a game system from the nineties that has lots of battery damage . IC's pins were all green and rusty , but no external signs of being in bad condition.
At least one of them seems to be dead (PAL16L8), and it doesn't either show damage beyond the green legs, which I did clean up. Someone told me days later that those things have a twenty year life expectance ( parameter retention time )

So..can you tell your experiences in this subject ? Which is the weidest thing you have found ?

Thanks and once again excuse me for my English.
 

Online TrickyNekro

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Re: Bad IC's experience.
« Reply #1 on: February 15, 2019, 07:41:15 pm »
LoL...

And don´t forget.... women fart too... but you only get them by the smell...

The world of electronics is not always spectacular unfortunately...
If you are an engineer and you are not tired...
You are doing it wrong!
 

Online bsudbrink

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Re: Bad IC's experience.
« Reply #2 on: February 15, 2019, 08:00:38 pm »
Sometimes you can find bad chips that show no external signs of damage, but ...How often does it happen to you ?

In a word: frequently.

Quote
So..can you tell your experiences in this subject ? Which is the weidest thing you have found ?

I restore "vintage" computers.  In my case, computers from the 1970's.  I am currently restoring a rare S-100 card and have identified five dead 7400 series chips with no visible signs of damage, not even any corroded or tarnished pins.  My understanding is that the board was stored "well" and was operational when stored.

I have heard that moisture can infiltrate some plastic carriers and wreak havoc inside.
 


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