| Electronics > Repair |
| LAN tester with burned IC |
| << < (4/5) > >> |
| 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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