i agree with Xit13, but would like to add a couple of things to try.
first, when you replace the MB3756 regulator, leave pin 1 unsoldered from the board and sticking straight out.
power up the radio and measure the voltage on pin 1. not the PC board trace, but the pin itself. you should measure right about 8 volts.
my guess is that you will see that 8 volts there, but if you dont, you have a problem in the power supply circuit around that MB3756.
if you see the 8 volts there, you can solder pin 1 to the PC board, BUT!!!
do not turn the radio on yet.
first, unsolder pin 9 of the PLL and use your continuity meter to check that it is not making any connection to the PC board. (use solder wick for this)
after you've confirmed that pin 9 of the PLL (MB8719) is not connected to anything, then you can turn the radio on, and check for the 8 volts again on the PC board trace that connects to pin 1 of the MB3756.
if you see anything other than 8 volts on that line, stop right here and figure out which part on that line is causing the erroneous readings.
the reason for doing it this way is so that you dont blow a good PLL chip.
if you do see 8 volts on that line, then you can solder pin 9 back in place, and make another check to see that its still 8 volts.
if it isnt, then your PLL is definitely bad and needs to be replaced.
(a little note on that- MB8719 chips are extremely hard to find these days, and many of the ads on ebay from china are different versions like the MMB8719 or the RCI8719, which are not the same, so be careful)
as for testing the caps, you can do a quick test with your continuity meter to see if its shorted, but you have to remove the cap from the chassis first.
you wont see any difference in the looks of good caps vs. bad ones.
good luck,
LC
