You asked a question earlier - check you TP mirror board jumper to ground - should have volts ALL THE TIME - yes that means it's got power and you can set AM power (carrier) while it's idle in AM mode. I just check it to make sure the AM regulator and Carrier power AM power - can adjust.
Else - note the length of jumper - when D38 is not working - you may have a blown trace from the rear of the board to the front - it's a PITA but get a magnifying glass and trace the routes and use a DVM to check for continuity.
I've had 122, 465 and 640e's blow traces - so it's nothing new...
The transistors need 8 volts from the main regulator to work, so if those traces popped, there's the reason.
Refer back to the graphic of the three transistors - look for 8 volts along that outer edge trace - that comes straight from the 8 volt regulator. So if the PLL works - you should have power along there.
The flat ribbon cable supplies power to the front panel - so if it doesn't TX - it means power is not "returning" to the front panel to turn on the TX lite - so that may mean the TX transistor may work, it's not sending power.
Ok, locate the ribbon cable that goes to the channel selector - with the radios component side up, the channel selectors - RIGHTMOST conductor in that ribbon, is your 8 volts to TX LED. - now what is different here, is you silence the speaker when you TX - so that tells me that TR33 should work but needed to be checked to verify - ok done, but it's not getting from the transistor to the left side, by the PLL and the Channel selector. - again check traces .... VR3 is the TX freq adj, - so I'm thinking a foil trace failure by VR 3.
So foil side up - locate the outer trace by those three TR33, TR32 and TR31 - and VR 3 - see if power get past VR 3 and towards the first pin of that ribbon connector - this time - it's the first one on the LEFT (Starting from the left)
:+> Andy <+:
BREAKING NEWS - Added this in...
:+> Andy <+: