Without a tester, multimeter, or test fixture it's impossible to determine which ASIC is broken.
Why not read the guides from zeusBTC they have some diagrams where you can find the test point to test the voltage.
If you didn't know this yet you can go and check the link below.
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https://www.zeusbtc.com/ASIC-Miner-Repair/Scroll down and you will find all guides on repairing hashboards.