Thanks for the replies everyone!
nextwednesday wrote:
There is no unambiguous way of testing caps other than removing them from circuit and using an ESR (Equivalent Series Resistance) meter together with a table of acceptable ESR values. (But then, having removed an ancient electrolytic cap from a board, why not just replace it anyway? They all go bad eventually.)
What makes you think the problem is on the PSU board anyway? It's quite likely, but not necessarily. Is the machine totally dead? I would start by using the voltmeter to look for the output voltages from the PSU, first in isolation, then under load during operation or attempted operation. If the PSU does seem suspect, look for bad solder joints (dry joints) with a magnifying glass - best from the underside of the board. They appear as a very fine line or crack around the solder joint. Some of the PSU board does look a bit blackened in your picture.
Best of luck and be careful round the PSU even when turned off. Plenty of shock potential there.
Yes the machine is totally dead!
Ok I'm gonna ask a dumb question - you said you check output voltages from the PSU in isolation - can you be more specific? What does that mean exactly?
This is the multimeter I use
https://www.petervis.com/meters/dt830d/dt830d.html Is it possible to check voltages with it? I connected the power to the player and tried using the DCV part of the multimeter but was only geting a reading of 001 or 002. Again, I've no idea what I'm doing!
Yes you're right, part is a big black and smells a bit burned. But I check the resistance of all the resistors and they seemed fine. I'm struggling to check caps - some show me a reading when I measure Ohms, but others don't and I'm not sure why.
cplusplus wrote:
It is interesting is this unit had a VWR1247 power supply inside and the DX-V500 service manual it says it is a VWR1268. VWR1247 is covered in the CLD-V860/CLD-2750K service manual.
https://www.giangrandi.ch/electronics/s ... sfix.shtml was helpful for me, and there are a lot of videos on Youtube on the topic.
The only known issue I can recall is the arc suppression fault that Kurtis has mentioned before, but I do not see it in the schematics (it doesn't look like the 230V supplies have them). You would also have a blown fuse.
Thanks for your help! I downloaded the CLD-V860/CLD-2750K service manual but it only seems to like the VWR1268 parts and not the VWR1247! I could theoretically change all the suspect parts but I don't know their value and can't find any of the capacitors in the service manual.