820-3662 works time to time.

[Don Anton]

Hi All,

This is not a liquied dmg board. it boots some times and post but no chime. some times fan spins for 5 secs, stop then fan spins again. both times all the power rails are present.
Tried to reflow SMC works couple of times then back to quater fan spin and continue. I checked in the morning works fine but no chime as usual wehn i turn the board here and there back to quater fan spin.
Any adice greatly appreciate.

 

[2informaticos]

This board suffers by FDMF6808 chips; maybe not related in this case.
But I recommend you to change them and see if got fixed.
Always better to replace them with real new FDMF6708, available on Mouser.

 

[JohnB8812]

This could literally be so many things including the FDMF chips. Check all basics (current sensing by ISL, clock chip, U1950 area, etc). The FDMF chips could be bad as well causing your issue or something insane as well.

 

[Don Anton]

Thank you for your advice. I have orderd new FDMF chips . Will update you asap