Fixed CEC audio problem! topic

I thought I'd tentatively share my working solution for cec on my bedroom aftv. I posted in the past that my bedroom tv absolutely MUST be powered on first before AFTV or the audio from every video i play will cut in & out indefinitely until i reboot aftv. This is extraordinarily annoying, especially since i have boot menu so the reboot process takes even longer. Someone isolated the problem as bad cec support on my bedroom tv. Looking into it, I saw you can remove or bend pin 13 on hdmi cables to kill cec. This seemed a little reckless so here's what I did...
I experimented with an old and unused roku box. I took a tiny sliver on electrical tape and carefully covered pin 13 on the hdmi cable. It took me like 7 times to get it perfect. Then i tried it with my roku box and everything worked fine.
So then i tried it on aftv with my old cec-impaired tv and it fixed my issue! Finally!

Only thing I wonder is the material i used. It's just a piece of electrical tape which should stay in place because this particular tv is mounted tightly to the wall with no side inputs (very difficult to plug in hdmi). Not that heat should be much of a factor since electrical tape should withstand but does anyone know of any reason this material might adversely affect the TV? All is working fine so I'm not trying to be pessimistic but if anyone with advanced knowledge of hdmi/cec has any info to add please let me know here. Thanks.