820-3115 Fan spins for one second than stops cycle

[Ictc]

I have this board
apparently no short, also checked main voltages and current sensing circuit around u7200 for wrong resistor values. Didn't find the cause of the problem so far.

 

[2informaticos]

Check if all coils pulse in that second.
Inspect R7402/03.

 

[Ictc]

In the mean time I desoldered and read the SPI content... Found a completely blank SPI rom!!! Reprogrammed and now I finally got it booting! I wonder how could have the spi ROM been erased completely ?

 

[Ictc]

The only problem I'm experiencing so far it's with the ram slots that are both not reliable anymore. Sometimesthey works sometimes I have to re-insert the ram in the slot different times before it will be recognized. That was usually happening in the upper slot, don't know why I have it on both.

 

[2informaticos]

Try to clean the slots better.
You can also resolder the contacts near the edge of the slots (in the MLB)..

 

[Ictc]

Great! Never tried manual resoldering of ram slots.
Thanks