Well....after some trials and tribulations, I finally managed to get my Yamaha PSR S550 keyboard fully working with it's new LCD screen, the first time I tried powering it up after installing the new LCD screen it wouldn't power up at all so I put my troubleshooting thinking-cap on, and it was when I was about to unplug the plugpack adaptor from the DC in socket that I found the cause of the problem, the DC in socket felt unusually loose and I immediately knew why, as it turned out there were two broken solder-joints underneath the circuit board where the DC in socket was soldered to the board, some tinned copper wire and solder fixed it completely and now the keyboard powered up, what's more, it also produced sound too.....so job done!!!
There's just one more issue that needs resolving, one of the D keys doesn't seem to trigger reliably all the time like the other keys, I'm thinking that maybe the circuit board contacts are a bit dirty and needs cleaning with some isopropyl alcohol, and there's a front panel button that's sitting lower than it's supposed to, but I reckon we've done pretty well so far, at least the keyboard is working anyway.
There seems to be two left-over parts remaining, a screw and a metal mounting bracket, not sure where they're supposed to go so I'll have to have a good read of the service manual to find out.
Here's a screenshot of the display I'm currently seeing on the new and installed LCD screen:
It sounds pretty good through the built-in speakers, but it'll be interesting to hear what it'll sound like through my 300 Watt Behringer K3000FX Keyboard amp.
Last edited by DrNomis_44; 30-03-2019 at 05:21 PM.
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