/vr/ - Retro Games

>>2717858
Now this is starting to get weird.
Perhaps the bonding wire (the connection between outside pin and silicon die) got damaged but that doesn't make much sense as this ROM never gets hot nor is it prone to electromigration as the current was always very small (<1mA) in normal circumstances.
You can find this out by measuring these two ESD protection diodes (see pic) which are on every pin, if you don't know how to measure diodes then ask google.
If you can't measure the proper forward voltage of around 700mV then it's open and it would explain why the CPU reads a 1 on that pin because if you turn on a GB with no cartridge then you simply get black block instead of the Nintendo logo as the CPU only reads 0xFF (D0-D7 are 1) on the data bus at address 0x0104-0x0133.

>I checked all pins to 3 and 30
You don't need to do that, only pin 27.