Hello Folks.
So I got a used Yoga 260 which power cycles constantly forever.
Problem: No Picture.
Fan Spins Up, stops, CPU gets warm. [I would say normal]
Power LED is constantly on (and goes off for a second starting a new cycle). Keyboard backlight flashed (and fades out, with "the right bios" otherwise it just goes out)
With no RAM installed it beeps.
I also checked with known working ram.
I checked fpr 3.3 and 5v. All present.
Also checked eDP connector. It has 20v.
"Backlight_On" is missing. So something isn't working right.
Board is not charching (could be a dead battery, probably not)
I started the naked board with nothing (except fan) attached. Result is the same.
First I thought it has to do with the bios chip. So I dumped the bios and compared it to each other and it all seems legit. Also if I flash and read and compare currently flashed dumps. So the chip seems fine to me.
I checked the Dump with ME Analyzer is something is broken, but nothing to see there. (Also the other dumps seem fine)
Than I tried to check with other Bios Dumps. With the original Dump the system powercycle like ever 7 to 8 seconds. With some other Dump the cycle is 13 seconds, and another one is 30 seconds (intel me?). I also bought access to biosfix and tried all 4 available dumps, at least one says clear me. I checked with MEA and indeed it seems legit and has
"Configured" starte. The other Dumps are inizialized. I'm not sure if I shouldn't at least get an Picture on the screen even with initialized ME. I'm not sure about the whole Intel Boot Guard stuff which might cause this trouble?!
At this moment I don't really know what would be the next best step.
The board itself looks fine. I haven't tested heavily for shorts but given that 1.35, 3.3, 5, 20 for Backlight is present I guess the power rails are fine?!
I attached the original bios dump. Maybe someone can check it or clear it... I'm happy for any further guidance what to do next.
So I got a used Yoga 260 which power cycles constantly forever.
Problem: No Picture.
Fan Spins Up, stops, CPU gets warm. [I would say normal]
Power LED is constantly on (and goes off for a second starting a new cycle). Keyboard backlight flashed (and fades out, with "the right bios" otherwise it just goes out)
With no RAM installed it beeps.
I also checked with known working ram.
I checked fpr 3.3 and 5v. All present.
Also checked eDP connector. It has 20v.
"Backlight_On" is missing. So something isn't working right.
Board is not charching (could be a dead battery, probably not)
I started the naked board with nothing (except fan) attached. Result is the same.
First I thought it has to do with the bios chip. So I dumped the bios and compared it to each other and it all seems legit. Also if I flash and read and compare currently flashed dumps. So the chip seems fine to me.
I checked the Dump with ME Analyzer is something is broken, but nothing to see there. (Also the other dumps seem fine)
Than I tried to check with other Bios Dumps. With the original Dump the system powercycle like ever 7 to 8 seconds. With some other Dump the cycle is 13 seconds, and another one is 30 seconds (intel me?). I also bought access to biosfix and tried all 4 available dumps, at least one says clear me. I checked with MEA and indeed it seems legit and has
"Configured" starte. The other Dumps are inizialized. I'm not sure if I shouldn't at least get an Picture on the screen even with initialized ME. I'm not sure about the whole Intel Boot Guard stuff which might cause this trouble?!
At this moment I don't really know what would be the next best step.
The board itself looks fine. I haven't tested heavily for shorts but given that 1.35, 3.3, 5, 20 for Backlight is present I guess the power rails are fine?!
I attached the original bios dump. Maybe someone can check it or clear it... I'm happy for any further guidance what to do next.
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