My Yamaha DX7 (MARK 1) WONT START UP CAN SOMEONE HELP ME PLEASE?

[JimmyTheDonutClerk]

Hello my Yamaha dx7 (Mark 1) wont start up suddenly? ive had it and used it fredquently since i bought in 2017 from japan (I live in sweden but use a transformer to convert the power to european voltage) ive never had any problems like this before with it? think it could be problems with the c10 condensator or maybe a crack in the soldering joints or might it be anything else? would really appreciate any help with trouble shooting whats wrong with it cause i use it all the time! ive checked the fuses with multimeter and they´re fine at least! Any help would be appreacited
it wont start up when i flick the switch!
ive upploaded pictures of the inside of the synth if anyone could maybe locate a problem by looking at all the moving parts in inside! does anything look damaged?

 

[DM60]

I would go for simple first if you haven't already. Check the fuse and check your voltage converter. Just dying is usually a sign of something simple. I couldn't tell if the fuse was blown, but an Ohm meter would make quick work of that. Voltage meter for your voltage. I'm really surprised with that late model it doesn't have a multi-voltage switch.

 

[JimmyTheDonutClerk]

the fuses are fine i checked with a continueety thingy! okay im gonna check the voltage converter but it seems like it works! could you tell if anything else was damaged?

 

[Slouching Raymond]

Does anything work at all? Does anything light up? Does it make a turning on sound through speakers?
Have you checked absolutely ALL of the internal fuses? What about any external fuses?
I would set the multii-meter to 'buzz' and have another go at the fuses.
Next, try jiggling all the internal connectors, and get them seated firmly.
Also check that the chips which have sockets are seated in them firmly.
Then set your multi-meter to DC volts, and see if there is any regulated power on the PCBs.
What voltage is between the thick pcb tracks labelled VSS and VDD?

 

[BTStudio]

I think fuses need to be out when checking continuity also

 

[TAE]

Not sure but does it have any batteries in it...ya know those small round ones...On some electronics that can be a problem. If not start with the power supply and see if you are getting DC voltage out. Been 30 years since I've had one of those.

 

[TAE]

If the power supply has voltage follow the path ...could be a broken solder joint down the line

 

[rob aylestone]

The transformer looks like it got very hot, and the pcb that sits over it looks really nasty - all the tracks look warped and distorted.

 

[DM60]

The circle area looks suspicious.

 

[Slouching Raymond]

The circle area looks suspicious.

I can't see anything inside that fuse to the right, except a patch of blood.

 

[rob aylestone]

I suspect you are hoping for a very simple and visible fault. All the suggestions here will only help if you have some tools, the ability to use them and the science to interpret what the evidence tells you. You need to establish likely culprits. “Wont start?” As in it’s dead, or you get a display but it won’t initialise or it lights up normally but there’s no control or sound out? Each of these suggests different area where the fault could be. Power supply dead is total no go but a good power supply and a a single component elsewhere could appear similar. First thing is to follow the power. AC out of transformer to DC out of rectifier. Establish what is functioning with the basics. If the actual synth pcb is getting the correct voltages, then start a visual observation there, not everything is visible. With elderly equipment that worked, look at the connections with cables that can wobbly or vibrate with playing. Dry joints can be reflowed and this is a very common fault and easy to fix. I’d guess power supply, then the main pcb for fault locations. Don’t just start prodding around with a soldering iron!