Hi the fan was not working at on in this model so I replaced with new fan and fan runs high speed constant.I have replaced U15 thermal IC but still the same. J3 has 5v on pin 1 , pin2 is ground and pin 3 tach is 2.5v.

I have Cleaned the Me region and re flashed with different dumps to test but still the same. Any ideas would be helpful.

3 Pin or 4 Pin Fan? For 4 Pin missing or confused control signal PWM and speed sensor signal.

3 pin fan

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Posted after 1 hour 49 minutes 31 second:
Changed emc2112 again now works