This was just posted over at the master repair thread for these sets. I thought I would share it here as well -
Forgive me, we've been very busy here so I just looked it over and the last few pages really don't
cover what you need to know. You'll probably have to go back as many as 10 pages, maybe more. Just don't
follow the advice in the early pages where various individual specific points
are mentioned as needing attention. If they are part of the active, directly connected circuitry and have not been resoldered yet by now, they all do. Each and every affected solder joint in there needs to be resoldered, regardless of how many and how small they are. It is a long and tedious process, but what else is new?
The entire Power Supply board was compromised at the factory with solder that was too thin and those joints are giving up the ghost all over the boards now. As such with very few exceptions the entire PS board
needs to be resoldered. Doing so will completely restore it and it will last indefinitely, just like the 100% performance all the other boards in there have been delivering all along. There are lots of boards in there, all of which have been performing at 100% all along and will continue to do so indefinitely.
I guarantee it for the PS board, as long as I am the one on the case for you. If anything like that happens again on your PS board, no matter how many years later, I will correct that condition again on your PS board for you, no charge. I can offer that lifetime guaranty because I know that doing so will leave me next to no work at all
to do in the future on this issue, as long as I was the one who resoldered your PS board in the first place. Yes, I have resoldered that many PS boards in the last few years, whose owners are even as we speak enjoying their sets every day now, effortlessly. As I have said many times over the years, these are hardy, permanent
sets. CRT - not just Pioneer, but all brands - was designed and produced in an era where things were built to last, unlike the fragile and highly disposable sets being sold new today.
BTW, I was just sent something printed on Just Answer.
Contrary to the advice of another very seasoned and experienced repair tech on Just Answer, no the PS board cannot be trusted if all you resolder are the currently affected joints, in fact doing so actually puts your set in more danger than it was in before,
because it exposes your set to the much more damaging joints that go bad later. If it's in its early stages, those intermittents you are experiencing are valid warning signs
because they don't usually damage your set, they just let you know something's wrong and that something definitely needs to be done before you keep using your set and exposing it to unspecified but still very real dangers. The ones that start to go bad later,
since you didn't heed the warning signs or only resolder what's bad now, are the damaging ones and can take your set down hard.So heed the warning signs!
If your set is currently exhibiting the symptoms of cold solder joints on the power supply board - blue flashes, fluctuating brightness, lack of picture or sound while running or even actual shut down - STOP USING IT!
Unplug it and don't allow it back up to normal operating temperature - EVEN ONCE - unless and until repaired PROPERLY.
Cold solder joints start to let go and do their damage ONLY ONCE YOUR SET HAS HEATED UP
thru normal operations. So don't keep your set on for more than 40 seconds from dead cold - for testing only -
during the duration of this very dangerous set of circumstances, which has the power to become a potentially catastrophic event and even total your set if your finances cannot withstand the onslaught of the more serious of repair bills. Nipping it in the bud keeps your repair bills low and entirely affordable, bordering on negigible compared to what you originally paid for your set. In fact the decision to do what's necessary when in the early stages is an incredible no-brainer, all things considered.
And no, the deflection board does not need attention unless damaged by the PS board's cold solder joints.
It does not
develop cold solder joints on its own in the course of normal operation like the PS board does. Neither does the convergence board. None of those boards in there do, except the PS board.
If your set is experiencing those dangerous intermittents, leave all the other boards alone! Concentrate ONLY
on the Power Supply board, the one at the end of your set's wall power cord, the one that plugs into your wall outlet. The less messed with in there the better, esp. if you are not a trained and experienced service technician.
This is a cardinal rule for service repair technicians who do this kind of work every day, and should be heeded by everyone: always leave alone whatever can be left alone!
Any time you dive into circuitry you risk opening a can of worms and suddenly having a lot more on your plate than originally intended.
So focus ONLY on the PS board in this case.