135 chip temps are always a bad temp and according to "
Miner normal operating temperature range" it is a maximum chip temp but according to one of your image it shows 149 which is too bad for your hashboard. It seems a faulty temp sensor if you are getting some temp spike.
Can you try to find which hashboard is getting high chip temp you can check this guide below?
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https://support.bitmain.com/hc/en-us/articles/226142788-Test-hash-board-one-by-oneAfter you find the one hashboard which is getting high temp then try to clean the hashboard or look for the temp sensor to clean I don't know where it is located on the board but I heard you can find the temp sensor on the middle back of the hashboard then test it again.
Thanks for ideas, I think it's the sensor, just based on how fast the temperature spikes and then returns to "normal" and that it takes 10mins after turning on for the first spike. And runs normally in between spikes. Do you have a picture of the temp sensor or anything to help me find it? Or is it something that will be obvious when I pull out the hashboard?
After a few years of operation you might just be seeing signs of wear and components may just start failing. I've never run s9's but when's the last time you checked and cleaned the miner? If it's all clear then you have to take the above advice and figure out which board is faulty and inspect it.
You can do so by disconnecting and reconnecting boards until you isolate the problem. Then you'll need to do a visual inspection for anything out of the ordinary like a scorch mark on the board or something loose. Bonus is that you can still run the machine off 2 boards or find used parts for replacement as they are EOL gear.
I cleaned them out a few months ago with air cans and leaf blower, but I didn't remove any hashboards, so I guess maybe that would be a good idea to do to all of them just in case there is any residual buildup.
