NSM ES6 100 CD Jukebox Troubleshooting

[Sidfaber]

Hi all! First post here but I’ve been watching this forum for years. Looking for any advice or suggestions on how to troubleshoot an NSM ESVI central board. 

Here’s the problem:  I have two identical units that don’t display anything on the LCD screen.  One was working for about an hour before it quit.  I can’t find any technical manuals online, only the operators manuals that came with the machines and show basic connections. No detailed schematics or troubleshooting. Looks like these boxes were pulled from service around 2005-2010.

What I’ve tried so far:  I replaced the M48T35 timekeeper chip and its Snaphat battery. I mapped out all the ICs and measuring points on the board.  Voltages seem good (+5 reads 5.24v), cpu clock is good, I can see data transfer between the CPU and the flash memory.

The LCD should get clock and data from a serial bus that I’ve mapped back to output pins on the CPU, but they’re both always high.

Any suggestions on where to go next? Happy to share what I’ve mapped on the board so far if anyone’s interested. Thanks in advance!!!

[Whatsnewpushycat]

Out of curiosity do you recognize this elevated timekeeping circuit board from a NSM phoenix series cd jukebox.
I need replacement of this circuit board can’t find one anywhere almost impossible it seems

[DecentFarts]

Hi all! First post here but I’ve been watching this forum for years. Looking for any advice or suggestions on how to troubleshoot an NSM ESVI central board. 

Here’s the problem:  I have two identical units that don’t display anything on the LCD screen.  One was working for about an hour before it quit.  I can’t find any technical manuals online, only the operators manuals that came with the machines and show basic connections. No detailed schematics or troubleshooting. Looks like these boxes were pulled from service around 2005-2010.

What I’ve tried so far:  I replaced the M48T35 timekeeper chip and its Snaphat battery. I mapped out all the ICs and measuring points on the board.  Voltages seem good (+5 reads 5.24v), cpu clock is good, I can see data transfer between the CPU and the flash memory.

The LCD should get clock and data from a serial bus that I’ve mapped back to output pins on the CPU, but they’re both always high.

Any suggestions on where to go next? Happy to share what I’ve mapped on the board so far if anyone’s interested. Thanks in advance!!!

Hey! I have a working Cosmic Blast that I can check things on if you need me to. I am currently working through the ES6 boards to be able to reproduce them.

Some questions:
1. Which unit are you working on?
2. Can you share some photos of the display module?
3. Can you share some photos of the central control board as well?
4. You have two ES6 central unit boards or two LCD boards that you have tried?
5. Any signs of corrosion damage around the central board connectors along the bottom of the board?
6. Test to make sure you do not have shorts across pins you should have shorts across for the central board connectors.
7. What is the machine doing on powerup? Is the CD mech doing its startup thing?