Originally Posted by delar
No, I did not notice any change after replacing the 1000uf cluster on the FMT board. Later, when I changed the 1000uf cluster on power board, I again noticed no difference in the wavy lines. The signal and DM boards have similar clusters that I have not touched as of yet. If memory serves me correctly, the Term-2 board does not have a cluster of four 1000uf caps on it like the others.Yeah, we figured that the problem is related to something that is always powered, whether the TV on on or off. Unfortunately it appears that most of the chassis electronics are powered all the time, so this doesn't narrow it down a whole lot.
Good news on the Term-2. (shew
) I'll give it a once-over when I'm in there again but I think I agree.
I believe noplasma said it best yesterday, the 6Vs and 12Vs run to almost all boards. The clusters of 1000uf caps likely hang off of one of those rails. These "sub-supplies" (as I call them) likely supply local circuits with the needed voltage(s).
Since these supplies seem to be designed identical (and operate off the same rail(s)), it is plausible that they would all need attention at near the same time in their life. In addition, ripple on one supply on the rail could have a cascading effect on its counterparts on other boards.
I already changed the caps on FMT and DM (which fixed my primary issue - blinking light) and plan on doing the signal and PS this weekend. That sub-supply happens to be on the PS as well, I believe.
I have a strong feeling this will take care of all my issues including the wavy lines. As far as I can tell, nobody has changed all the caps on all the boards yet (with a set that can get through boot) to see if the lines go away.
I also plan on changing a few other caps near heat sources on the PS.
4 x 1000uf on FMT (done)
4 x 1000uf on DM (done)
Random suspect bad solder joints resoldered on PS, DM, and FMT (done)
Problem solved - set boots and after standby PS warm up, the picture looks good with very minor lines (better than before) on the component inputs.
4 x 1000uf on Signal (this weekend)
4 x 1000uf on PS (this weekend)
?? x ????uf on PS (for good measure - this weekend)
This should solve the remaining and very faint lines in my component inputs if what we are speculating is correct. The lines I have now are nowhere near as bad as some have posted.