Electronics > Repair
LAN tester with burned IC
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Traceless:

--- Quote from: kripton2035 on May 26, 2024, 10:59:17 am ---74LS90 is 16 pins ...

--- End quote ---

According to the Texas Instruments link i posted above it is a 14 pin IC  ;)
ArdWar:
Pin 4 VCC and Pin 11 GND.

Pretty sure single chip solution for this kind of gadget is a MCU.

Looks like the chip is just painted over, maybe some application of various chemical can help. If they didn't sand it first ofc.
Traceless:
Okay I found two sources that claim that the IC might be an "SAM8928". Here someone posted a schematic (note the SAM8928 in the BOM links to an SN74AHCT02D which has a different pinout, I guess they just used that one for the SOIC-14 footprint and renamed it). On this page somone analysed and modified different version of those testers.

A quick google search did not yield any sources for that IC.

Cheers Traceless
Coordonnée_chromatique:

--- Quote from: Zlobnick on May 26, 2024, 09:52:52 am ---
--- Quote from: Coordonnée_chromatique on May 26, 2024, 09:15:12 am ---Please, show the final result of the rework.
The heat resistance of the bakelite is low and the risk of delamination is very high i will be really pleased to see your extreme soldering skills !

--- End quote ---

If I ever get that chip identified I'll make a video just for you, maybe you can learn something :D

--- End quote ---

I've never seen a clean multipin chip SMD rework on a cheap bakelite board, this is a real performance and i think that you shoud share it with everyone  :clap:
madires:
It's quite easy with the right tool, i.e. soldering tweezers with tips for SOICs.
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