Sometimes it's not a hardware issue you should check the temp first or fan speed and maybe it is because of high temp and low fan speed that is why you are getting low ASIC chips. So increasing fan speed or reducing frequency might solve your issue.
That's true , however based on my personal experience, if the chain is not showing at all, then there is a good chance that it's a software related issue, however when the chain does show up , but the number of chips reported is lower than average then i'd say 9.9 out of 10 times it's a hardware issue.
OP , changing a chip on those boards is not something you can learn from Youtube, unless you already have an intensive experience in fixing other types of chips, also economically it does not make sense to get all the tools and probably spend 1-2k for a course to learn how to fix those boards only to fix a few potential bad hash boards you own.
if i was you, i would follow Bitmaxz advice, maybe also swap PSU cables as well as data cable, and if all that fails, i would either leave it as is, or buy another used board.
