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I'm almost certain your screens are perfectly fine. The problem lies in the motherboards removed from devices with broken screens. A broken screen often damages the motherboard, resulting in the problem you're describing.
This is especially true with the Clara BW.
And forget about VCOM and Waveform.
With a working screen and a non-original motherboard, you won't notice any issues, despite the different VCOM and Waveform values.
Trust me.
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