Originally Posted by kismail
One red LED is lit on the PS board, labeled "Power Down"
With a 6.3 amp fuse blowing, we expect the defl bd to be down. That's the bd mounted on the floor of the unit in the middle, below the green CRT. It will usually have a red LED lit up on it if down, requiring its replacement.
If that's not lit, but you have had conv probs in terms of the hourglassing of your pic, perhaps the conv bd is blowing a new fuse now. Always before it has been either the horizontally mounted 4 A or 5 A fuse on the PS bd, which sometimes disables the red light on the conv board once a fuse is blown on it, such that sometimes it's blown, but the light on it that is indicating that, can't light up because of that part of the conv board not getting any voltage.
There are no easy answers on this one, from my experience. You could try ordering the PS bd from Pioneer and trying it out, with the proviso that you can return it if you need to, which they will do, in which case you're only out the shipping. Actually you can do that with any of the 3 boards that are suspect, all of which are mentioned here. If doing that makes your set work, send back/return whatever board winds up being the culprit, and send the original PS bd or conv bd to me and I'll get that one going for you while preserving all your precision settings from it to the rest of the set. If it's the defl bd that's at fault, you can keep the one you ordered from Pio and send the bad one back for core charge refund.
Or send me the conv bd, I'll replace those obviously suspect ICs and that may do it.
Have never seen the cold solder joints on the PS bd alone cause the 6.3 A fuse to blow. It's always something downline from the PS bd, even if caused by spikes sent down into the rest of the set because of the PS bd's cold solder joints.
Again, no easy answers on this one. This thread is all about the history of these problems on this series, and this is off the beaten path of this thread, and of my own personal repair experiences on them.