512k ?

[Fred1212]

Hi Brains Trust. 512k bongs and the screen displays expected startup for about a second then black. Anyone experienced this and can head me in the direction of possible culprit/s Cheers

 

[bibilit]

Bad or weak solder joint at J1

 

[Fred1212]

Thanks have checked this

 

[Iesca]

Did you do re-flow or re-solder anything? Even if the harness has never been removed, it can still result in cracked joints over time.

 

[robin-fo]

Thanks have checked this

It‘s almost impossible to see the cracks sometimes. Best reflow anyway

 

[Fred1212]

The AB is a new old stock and works perfectly with plus board. I suspect the LB maybe memory or? thanks