Questions About The Numark MixDeck Onboard DC Port

[CapLeaker]

A block diagram lets you see in highly visual blocks without resistors, caps only showing the main components on how this thing is working. It would have very simply shown on one page how the data flows to the LCD displays,

You got nothing showing on both displays. So whatever it is could be a single thing affecting both displays. So follow the data lines. If the main chip isn’t doing anything for whatever reason nothing will be on the displays for example. Same thing if a chip needs a crystal to work. Crystal dead, a dead buck converter, etc… chip not working either. There is tons to check and cover.

[TurcoLoco]

Yeah, you are right, no such page. Just wiring diagrams, assembly diagram and negative PCB shots (whatever they are for).
I will ask to see if they have it but I am guess if they did, they'd have sent it already.
Shame such a detailed service manual too.

What I meant with a single thing is, it is not likely to be a capacitor or resistor located on the display board as both are having the same exact issue.
How could have a data line crap out, is a mystery to me. This thing is too exotic and the only reason I took on the job was because it seemed like a straightforward socket replacement.
He just paid for the parts as I am not even charging the guy as I told him this is not something I normally do.

I am aware there is a lot to cover but I still would like to do some troubleshooting a bit, if I can, if nothing else, to gain experience.
If you can throw anything my way to check, I'd appreciate it.
Either way, I am grateful for the help I got this far!

Cheers,
Matt

[CapLeaker]

You can check all voltages, buck converters, crystals, and some data lines from SPI chip or IC2 and others. This SM is very hard to look at on my iPad. Too much scrolling and zooming in out. This isn’t nearly a detailed SM. There are others that are much more detailed than this.

Look at the PIC chips. Check basic things like correct voltages, oscillator, SPI data line. Then both sides need to be able to talk to each other and I think that this may be done via this IC2 data bus, but not sure about that. The SPI flash has firmware on it. Could be corrupted or dead.

You could look for a factory service or troubleshooting port like a TTL then hook up a USB to TLL and run a terminal and see what it does.

[TurcoLoco]

You can check all voltages, buck converters, crystals, and some data lines from SPI chip or IC2 and others. This SM is very hard to look at on my iPad. Too much scrolling and zooming in out. This isn’t nearly a detailed SM. There are others that are much more detailed than this.

Look at the PIC chips. Check basic things like correct voltages, oscillator, SPI data line. Then both sides need to be able to talk to each other and I think that this may be done via this IC2 data bus, but not sure about that. The SPI flash has firmware on it. Could be corrupted or dead.

You could look for a factory service or troubleshooting port like a TTL then hook up a USB to TLL and run a terminal and see what it does.

Hi Capleaker,

Thank you. I will check all the voltages I can think of in hopes of finding something off.
I did (like the idiot I am) splash some solvent to my face a few days ago, luckily I was wearing glasses but my face is pretty awful right now.
I think the chemical burn also got infected so one of my eyes is also a bit swollen. It is getting better but slowly.
I will work on this when I feel a bit more up to it.

What sucks is having both parts still connected to check voltages due to very limited opening, it will be a pain.
Oh well, I will post back when I have done some checking.

Thank you again.

[TurcoLoco]

Hi Capleaker,

I got an email from their tech support today. One of the techs was able to get a copy of the block diagrams from an engineer and emailed it to me!
It didn't seem that comprehensive but perhaps this is due to my lack of knowledge/skills.
Let me know what you think!
It has a few pages so it shouldn't be too bad even on an iPad.

TIA.

PS. After 58 posts and 2+ months, I am still getting the image (human) verification!
Is there a mod I can talk to about this annoyance? What is the dang threshold?

[CapLeaker]

This block diagram is somewhat helpful, but said nothing much on what we need. We know now how the boards are connected and talking to each other. But as far as the display goes there is nothing.

Under a Block Diagram I understand this: see attachment.
This block diagram is for something else, but you get the idea once you see it.

[TurcoLoco]

Yeah, even though I don't know anything even when I saw their block diagram, I thought "WTH is this?"
It looked too simple and also limited but hoped maybe it'd make sense to you!
So, this won't help us know what to troubleshoot, huh?