Post
Topic
Board Mining (Altcoins)
Re: GridSeed 5-chip USB miner voltage mod
by
happydaze
on 23/04/2014, 01:23:33 UTC
Hi Nemercry,

There is just 1 (ONE) resistor to be solder...I called it Rmod =17K/16.9K...

It is to be soldered to the cut-off bridge pads of R46...1 cut...1 solder...that's it...simple...

The original resistor...Orange at position #1...You called "R52"... is in reality R139 = 33K...the  last resistor in the chain of VID resistors ...the same one that you are replacing...This one is just STAYING in place...untouched...NO un-soldering needed... simple "work?.. no thanks"... Grin

You are completely correct as of doing 2 bridges...marked "Yellow"  to "undo" the R139/"R52" mod and to shift the Voltage reference back to resistor in the "green" position...=36K...

I am doing reversal of the Rmod in R46 position by simply shorting back R46 pads...even with Rmod in it...So effectively we back to R139/"R52" value = 33K...ORIGINAL stock value...schematics...performance...etc...
 
I hope it is clear now... Grin

Regards, buddy...

Definitely more space to work in over by R46.  I'd like to put a jumper and a resistor there but might not bother. 



That's 1/4 watt resistor in the photo (wrong value).  I could only find 1/2 watt locally today and I gave up trying to fit it in with a jumper.  Thanks for the "rollback" info Nemercry & ZiG - that gives more options should it ever be needed. 

I was having a bit of trouble soldering over at R46.  For some reason I could not get the solder to bond well on the inner point.  It would break free easily. No problem with the outer point.  I gave up and re-bridged it. That was with the 1/2 watt resistor.  I'll try again when I get the 1/4 watt resistors I ordered.