ROG Thunderbird (pcb build)

[negativefx]

Hey all,

Just built another Thunderbird using the 1776 pcb.  Getting a really faint hiss from it and nothing else when engaged.

I checked all the voltages and every pin voltage lines up with those detailed in the ROG pdf *except* IC1 pin 1 is reading 24V instead of 12V.  Any ideas why this would be the case?   Short on C10?
Thanks!

[negativefx]

Anyone built off this board?  I've retraced everything and I'm not seeing any shorts and double checked my wiring... not sure why there's 24V heading into pin 1.  

[strewel_peterson]

I used the 1776 pcb recently without any problems - just checked my voltages (sorry it's a while after your post: I didn't get a chance before now), and I get 12 and a bit volts, as per the 1776 notes, at ic1 pin 1, so the board would seem to be blameless. Would have thought an "invisible" solder bridge on a pcb unlikely, so I'd say your suspicion of a faulty component is most likely. Good luck!

[negativefx]

If you pull out IC1, 2, and 3, what's the resistance from pin 1 to 8 on IC1 socket?

[strewel_peterson]

Hi - resistance is O.L between ic 1 sockets 1 and 8 with ic 1,2 and 3 removed. (board not under power, and nothing plugged into the input jack, so the R pad isn't connected to ground, not that I think this would make a difference to the resistance between socket pins 1 and 8).

[negativefx]

Ok, that's what I thought.  Mine reads ~150k.  To the magnifying glass!