Electronics > Repair
LAN tester with burned IC
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daisizhou:
It is easy to solder using a hot air station. The key is to determine the exact model of the chip. I guess it may be a microcontroller chip with a program.
Traceless:

--- Quote from: mikerj on May 26, 2024, 10:02:50 am ---It really depends on the quality of that specific board.  Some SRBP PCB's are quite robust and easily reworked, while others have the copper lifting off with minimal heat applied.

--- End quote ---

True, but looking at the board even if the traces lift around the IC they all run on the surface layer are clearly visible, lead spacing is relatively large so it can easily be bodged in case of disaster. Just epoxy the replacement IC to the PCB and run bodge wires to the connected components.
Traceless:

--- Quote from: daisizhou on May 26, 2024, 10:20:55 am ---It is easy to solder using a hot air station. The key is to determine the exact model of the chip. I guess it may be a microcontroller chip with a program.

--- End quote ---

Yeah that's what I thought too, in this case reading the chip od an intact unit with a T48 could shed some light on the case. On second thought though maybe we think to complicated and the chip is maybe something simple like a SN74LS90? 
shapirus:
Knowing which pins are VCC and GND could help (at least to filter out the ICs that don't match). It's not quite clear from the photo: the GND (power negative) trace goes to under the IC, and it's not clear where the battery plus trace starts, as the power positive terminal is covered by that plastic cap.
kripton2035:
74LS90 is 16 pins ...
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