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Kelvin Katungi



Joined: 12 May 2012
Posts: 9
Location: Uganda
PostPosted: Sat May 12, 2012 11:29 am    Post subject: Vertical IC Reply with quote
How can i tell a faulty IC
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Sun May 13, 2012 11:20 am    Post subject: Reply with quote
1) Swap it with a "known-good" (aka = NEW) one?
2) Make sure all pins have the proper voltages / waveforms?
Kelvin Katungi



Joined: 12 May 2012
Posts: 9
Location: Uganda
PostPosted: Sun May 13, 2012 1:29 pm    Post subject: Vertical IC Reply with quote
Thanx JTS1957, is there a way i can test this ic with a digital multimeter (without it being in a circuit).
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Sun May 13, 2012 2:28 pm    Post subject: Reply with quote
Comparative resistance readings.
Measure and record resistance (observe meter polarity) between pins 1 & 2, 1 & 3, etc., then pins 2 & 3, 2 & 4, etc., etc., etc.
Once done, do the same with a "known-good" one and look for MAJOR discrepancies.

Anticipating your next comment (you don't have a "known-good" NEW one) ...
IF you know the functions of each IC pin, you can cheat and measure VCC & GND, VCC & Input, VCC & Output, GND & Output, etc.
Kelvin Katungi



Joined: 12 May 2012
Posts: 9
Location: Uganda
PostPosted: Mon May 14, 2012 2:19 am    Post subject: Vertical IC Reply with quote
@jts1957, i like that one (anticipating next comment). Otherwise i will comply,thanx
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