PA4X does not boot even after replacing main board-Need help

[allan_s]

Hello,
Need some advice/guidance.

My Pa4x stopped working a month ago. It would not boot up, it freezes at the logo. I had OS 3. So I reinstalled OS2 and it didn't fix the problem, I upgraded to OS3 again, still no luck.

I brought it to a Korg authorized service center in Houston, TX USA. They looked at it and said, the main board needs to be replaced, they ordered a board from Korg and replaced it, but it still didn't fix the issue.
They said, it's not the mother board and the next steps are try and replace the left board and the right board. But unfortunately Korg does not have these boards any more. They returned my keyboard back to me in the same state after spending $300.

I am wondering what are my next steps. I can try and replace left and right boards myself and see if fixes the issue or not. Where can I locate these parts either new or used?

Of any repair shops in Texas USA who can help me with?


Thanks in advance

Allan.

[worth]

That sounds like my worst nightmare . I am so sorry you are experiencing this . I wish I could offer advice . Unfortunately I can only offer my sympathy.

[worth]

That sounds like my worst nightmare . I am so sorry you are experiencing this . I wish I could offer advice . Unfortunately I can only offer my sympathy.

[duby2]

He's right the worst nightmare I'm sure everyone feels bad that's what I worry about when the next time I turn it on and my keyboard won't boot up and don't know how to fix it.
And what is even worse is finding parts and the cost of trying to repair it is it worth it.

This is one reason why I bought my PA 1000 for a backup that would give me time to look for another PA 4 or some other keyboard to do the job.

korg it's not making the replacement parts anymore they just expect you to go by a new one.

For me I could get away what's a PA 700 but don't tell Korg that.
Because you'll probably stop making it once they find out you don't need all the bells and whistles.

Yamaha has a good keyboard PRS 900 and works just about the same as though genos or the PA 5.
To spend that kind of money for the PA5 or the genos 2 won't happen with me when they're stepped down keyboards do 90% of what the big boys do.

Unless you could find a used PA 4 in working condition for a cheap price I would then buy it if not I'm gonna cut my losses sell my PA 4X for parts.
You might find parts for the Pa4 but when you're all said and done you got too much money into a keyboard that's old.

the Medeli AKX10 .or
pa700---yamaha prs900... No more high end very expensive keyboards that don't do much more then the cheap ones or in the case of korg updates are impossible so far.

Now for myself sitting around the house and I wanna play very nice music hi Might bye the genos or the PA 5 but. as a workhorse every day that I use I need something dependable and replaceable at the right price not an obsolete keyboard or the flagship keyboard that not needed.

the genos piano sound great and I love it but ,,, 98% of the people do not know.. sad to say

well that's just my $0.02 worth just an opinion and everyone has one and that's a good thing.

[Giner]

@allan_s

Did you try Syntaur? They’re in Texas, I think.

[menara]

If you're looking for the cpu board (the first one on the left)
You can find one here:
https://www.ebay.ph/itm/155955259847

But if you reinstalled OS2, your cpu board should be OK.

[allan_s]

[quote="Giner"]@allan_s

Did you try Syntaur? They’re in Texas, I think.[/quote]

They dont have these parts in stock. thanks,

[Aripearlmusic]

It may be the power or any of the wires that connect the boards. If the power isn't as expected when going through each board it will prevent it from completing the boot cycle. If you were able to install OS V2 successfully I would recommend booting into diagnostic mode and running every test. The OS wouldn't be able to install if the main boards had any issues and would only allow superficial issues like the amp board, I/O board, and any broken I/O ports

[allan_s]

[quote="Aripearlmusic"]It may be the power or any of the wires that connect the boards. If the power isn't as expected when going through each board it will prevent it from completing the boot cycle. If you were able to install OS V2 successfully I would recommend booting into diagnostic mode and running every test. The OS wouldn't be able to install if the main boards had any issues and would only allow superficial issues like the amp board, I/O board, and any broken I/O ports[/quote]

Thanks, I was thinking the same, check the connectors inside. Where can I find steps to boot into diagnostic mode?

Thanks in advance.

[BR]

...Where can I find steps to boot into diagnostic mode?...

Hi,
If you mean hardware check in Korg Pa series Arrangers (I've done it that way for Pa1000), here you go:
While Holding Style Play and Media buttons, Reboot (Turn On) the keyboard.
It displays a page to check all hardware in the keyboard.

Hope that helps.

[allan_s]

One of my friends suggested getting a new power supply. He said power supply may not be sending enough voltage to the main board, that's the reason it's not booting up. I got a new power supply from Syntaur and replaced, but no luck. Thinking what my options are....

BTW, I got a PA5X. So my PA4X fix is going to take less priority now. Nevertheless I want to get this fixed at some point.

[musiccankill]

If you can get into the test mode , it means that your left panelboard is ok (at least ok enough for it to boot properly).
When you get into the test mode , run the diagnostics,
It shouldn't stop with error on any of the first tests (TGL ,memories, TC-helicon etc).
If it does then the issue is the CPU board as you said the mainboard has already been changed.
If it passes them , press jump and go to the panel keys (don't remember the exact name atm) and check all the keys.
If you can press none of the right side then you need to replace the right side panelboard.
If both sides have keys that respond (at least 1 key per board means the cpus on the boards work so it shouldn't stop it from booting) , then check the ribbon cause if i remember correctly , it doesn't boot without it too.
If it is ok and it still doesn't boot then it is the mainboard from the start and they just didn't change it.
It makes sense to me that it has the old one as the mainboard had a higher price to buy it than the price you mentioned so i doubt they changed the mainboard as it would be the price of the mainboard + the worktime...