Before i start I want to give out thanks:
1) I want to thank cryptocrane.com for quick delivery and being stand up and helping with the Antminer problems-- super cool
2) I want to thank Antminer for making a defective unit and being absolutely no help in resolving the problem, even though silmilar problems are written about on these forums from the S2.
3) I cannot remember who it was but a guide was written about the beaglebone issues on the S2 and how to replace the card--thanks

A quick introduction, I am new to BTC and come from a background of extreme overclocking etc.  I have followed BTC for years and decided it was time to play with some mining hardware. ( I know, a little late to the party).  I purchased 2 Antminer S4's about 2 weeks ago from http://cryptocrane.com and received my rigs 2 days after purchase.  Within 2 days one of the miners was dead.  It had the dreaded amber light on the PSU.  

This is a simple repair of a fried BB board.  It may or may not be easier to replace the BB board for $60.

After a little searching I realized the PSU issue and opened the unit and replaced it with 2 Corsair units that I had in my possession.  The unit was still dead and after playing around with it I got the LCD to at least come on but then realized I had a dead beaglebone card.  None of the beaglebone LED's were lighting up.  

I continued looking online and found the guide to replace the beaglebone card and update the SD card etc.  So i ordered a couple of beaglebone cards.  This is after getting no assistance from Bitmain. The guys at cryptocrane.com were replacing the PSU's and helping troubleshoot.

The problem with ordering parts is I have to wait--- not my strong point.  So i took out the parts and went to work.  

Again- these mods were on the non working BB board and I would not suggest doing these mods on a new BB card as it would be unnecessary.

I am still not sure if the PSU or the beaglebone card went first but I would bet the PSU shorted the beaglebone card.