Question sir. What causes it for those solder joints to crack? Next is, if an hf radio that was working as it should before and was put in storage in a hot and sometimes humid environment for more than 15 years, and now, it just turns ON. One with half a display horizontally, the other has no display at all. No RX, just the typical hiss sound on FM on both radios. Not sure of the TX because I don't have the proper antenna for it yet. Both are IC-735's that is from my late father inlaw's. The other one had normal RX for just a while and lost it, the other one is just quiet. Whst do you think is the problem sir? Would recapping it and changing the internal battery bring it back alive? Thank you sir.
As for the cracked solder joints. Years of On Off heating and cooling puts stress on solder joints and the solder the manufacture used at that time seem to be susceptible to cracking. As for the IC-735's sounds like the PLL has come unlocked on one and the other is unlocking after heating up. I would start by looking at the caps to see if there are any bulged or leaking. If you find discoloration on the board under a cap it is leaking and will need replaced.
Great work. Glad it was something simple.
Thanks for sharing your knowledge
That's a nice lil rig right there ...
It reminds me of my R5000 with the same dots. In that case it was the PLL with issues.
Question sir. What causes it for those solder joints to crack? Next is, if an hf radio that was working as it should before and was put in storage in a hot and sometimes humid environment for more than 15 years, and now, it just turns ON. One with half a display horizontally, the other has no display at all. No RX, just the typical hiss sound on FM on both radios. Not sure of the TX because I don't have the proper antenna for it yet. Both are IC-735's that is from my late father inlaw's. The other one had normal RX for just a while and lost it, the other one is just quiet. Whst do you think is the problem sir? Would recapping it and changing the internal battery bring it back alive? Thank you sir.
As for the cracked solder joints. Years of On Off heating and cooling puts stress on solder joints and the solder the manufacture used at that time seem to be susceptible to cracking.
As for the IC-735's sounds like the PLL has come unlocked on one and the other is unlocking after heating up. I would start by looking at the caps to see if there are any bulged or leaking. If you find discoloration on the board under a cap it is leaking and will need replaced.