Did you ever figure out what the problem was?
I have 2 Cobra 29's, one LTD the other LX. They were bought brand new several months ago. I have the exact same issue with them. On the LX I get the correct frequency at TR16 but non of the voltages past IC3 check out.
I have posted on a different thread also but am not sure if anyone even comes on these forums anymore or not.
I have gone bald trying to figure it out as if I did not have enough falling out to begin with. I have been going at it for a little over a month now with no luck. I bought the LTD to check all the resistor junctions for the proper voltage so I could fix the LX but the LTD ended up dying the first night I took it out of the box. I think I shorted something out by accident when my hand slipped as I was taking a measurement.
I have literally all the tools needed:
Frequency generator (audio)
You name it, I have it..... Not to mention IF cans, transistors, resistors, pots, caps, diodes, everything so there should be no reason why I should not be able to repair any radio. I guess THE MAIN thing I am missing is detailed knowledge of how the system works. I do have a good general knowledge of it but obviously no enough to be able to troubleshoot my way out of this situation. I have gone through the voltage charts and the schematics on a daily basis and still nothing.
I have done several mods and things so I am capable but I really need some help PLEASE.......
Any and all advices is welcomed.