[Elecraft] Help, I think I've killed my K1

[John Webster]

Hi:

I've been lurking on the list for some time.  I have found it to be 
enjoyable reading.  Now, I really need help from someone.  It
seems pretty obvious to me that I have blown something (possibly
the MCU in my K1).  Here are the details of what happened, and
some elementary voltage readings.  Any assistance would be
greatly appreciated.  [Alert, rather long post]

My K1 sits on top of my TS-850S (expensive stand!).  I normally
have the K1 switched off when I operate phone with the 850.  I
nearly always use the K1 for CW because it simply works better
than the 850 (even with its 500hz filter).  Once or twice in the past
I have forgotten to switch the K1 off while transmitting with the 850,
but with no antenna attached to the K1, no harm seems to have 
been done to the rig.  I've tried to avoid this since I am using an 
end fed random wire antenna, and even though only a foot of it is 
in the shack before it exits, it is still radiating from the get-go.

Recently, I've added a manual tuner to the system (it sits right next 
to the K1 on top of the Kenwood) because the built in ATU in 
the 850 has trouble matching the antenna on some bands (unlike 
the K1's ATU!).  Last evening I did not realize that the K1 was 
still switched on (it was on the S-meter setting, the band was quiet, 
nothing was showing on the LCD, so it looked off) and unplugged
the antenna from the K1 and plugged it into the manuel tuner which
was connected to the 850.  While adjusting for minimum SWR on 
17 meters, the K1 amber antenuator LED lit for a second (a relay 
clicked I think) and I immediately stopped tuning the big rig, and 
switched the K1 off.  Upon checking, the K1 would not switch on.
No LCD or LED or relay clicking on powering up.

I've opened the rig and checked the following:

1. Power Supply 13.5 volts external, 10.4volts internal battery.  OK
2. +6v and +8v regulated power supplies seem OK.
3. I get the correct DC voltage readings for all pins on RF Board U3, 
    U4, U7 and hear an audio click in the headphones on powering up.
4. I get .35v on pins 1, 2 of RF Board U1 & U2 (instead of 1.4v), 
    and 0v on rest of U1 & U2 pins. [I had to remove the NB board
    to get U1 readings, and I did not replace C22)]
5. I get no voltage readings at all on FP board U1, any pin 20-40
    (I can't easily measure pins 1-20 without further dismantling).
6. I get no voltage readings on FP board U2, U3, U5, on any pins
    I can measure, except .69v (should be 6v) on pin 5 of U5.  
    (Again I can't get the probe in to all pins while assembled).

This is a K1 RF board Rev D.  Firmware: FP U1 (MCU) ver.109E
KAT1 ver 110, NB ver 102, Filter Board (40/20) ver 100

Obviously, I can't get beyond step 1 of the Troubleshooting guide
in Appendix E of the K1 manual.  I only have a DMM, a "transistor
checker", temp. controlled soldering station, and basic tools.

All help would be gratefully received,

73, 

John, N6JW