This sounds good. So when a chip fully stops working all others remain working.
If one chip
fully stops working and does not forward messages, all chips from that defective one to the end of that row will not function.
If that defective chip still forwards messages, only its hashes are dropped (hw errors).
Oh... rest of the stack... I thought that means the remaining 9. Now the question is how often chips break. I guess overclocking will raise that probability.
All chips are connected in chain in|out-> in|out-> in|out-> in|out .... 1st chip forward message to next. Each miner have different number chip in chain.
In burnin solution are IIR two chain, each contain 10 chip.
How many chip stop working are depend what exactly are broken inside chip. Most worst scenario: 1st chip in both chain stop working definitely.