Mesmerised wrote:I want to post this as a word of warning:
I have tried the above mentioned display mod on my newly acquired K5000S - and now it's a big doorstop.
I have to mention first, that I'm a rather experienced builder and have built and repaired lots of synths over the years. I know how to read schematics and I know which side of the iron gets hot.
So, I ordered the Display "1pcs 24064 240x64 Dots Matrix LCD Module with Blue LED Backlight" with the exact specifications you mentioned ( LCM24064B-B) from a chinese ebay seller.
I have checked all the available documentation and K5000S schematics and it all fit together very well indeed.
(btw. where did you find the info about the solder link settings? I did what you described anyway)
On power up nothing happened. Trying to find the fault, I found out that the display had short-circuit (Pin 2 to 3= 0 Ohms) and that obviously took the power supply down.
Unfortunately the secondary fuse wasn't the only thing damaged on the PSU.
To get the synth working again, I replaced the original display and cabling and powered the main board by lab PSU.
To my utter dismay the board didn't boot at all. (5v current: 1A)
So, inexplicably, the faulty display took down the main board with it - which is a real bummer!
I'm not complaining to you, HideawayStudio, and I know that this is my responsibility. But I wanted to warn people, that a) you can get a faulty unit from china and b) it can take down your whole precious K5000!
I checked and double-checked everything I did and I can't find the slightest mistake from my side.
Well, it was a real beaute and just had a dim display... AAAARGH!
Mesmerised wrote:Hi Dan,
thanks for your answer - I kept close to your instructions: unsoldered J2, set j1, keep pin 19 and 20 not connected...
Which jumper might short to ground? J2? (looks clean though...)
Could you give me a hint for a replacement of the transistor Q1, since I can't seem to find this particular Japan transistor 2SA1641?
What bothers me is, that I have tried powering the synth by a lab PSU and it didn't boot... So I'm afraid that there might be more damage than the PSU.
(does it need the analog board to be powered to boot? I wouldn't think so...)
I'm pretty devastated but willing to not give up easy on this one!
best regards, Chris
HideawayStudio wrote:The part number is: (HSM) LCM24064B...
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