Did you lift the receiver chip too? I think it has been hit or miss removing a leg on a chip. You have the 5V, the DC ground, and unknown other interactions. Knowing how the TIU was being used at the time of the fault can sometimes help. But remove chips completely. Start F1. But if all 4 transmit off and still short, remove receiver chip.
Frankly, I power up tiu with Z-4000 amp meter. If I have high current, I know I have a short. I DO NOT continue to run it with a short. If all the transmit and receive chip bad, 3V ok, you have other chip damage that involves 4 sided kazillion leg chip that makes TIU unrepairable at our level. G
