Hey all,
My Yamaha RX-A2010 very recently began having weird corrupted characters on the front display. This only happened right after I turned the volume very high up (-2.0 dB) for a short period of time. It always seems to be that certain segments accidentally become "linked" with other random ones, causing them to partially display what's on the other ones in a very broken way. It's completely random when it happens and how severe the issue is.
Here's a video of the problem:
https://cdn.discordapp.com/attachments/889966457226682458/1107840178543939684/20230515_181906.mp4It's solved by turning the receiver off and back on again. But it comes back in very minor glitching on the source name segments (the smaller ones in the top left of the screen) after the receiver has been on for a while (this image depicts a more severe case but my point still stands):
I suspected that this could be a voltage regulator near the display controller going bad since the issue mainly pops up at high volumes, but I checked the voltages leading to the display controller and they all match up with what they're supposed to be. The display on this receiver is a VFD with a built-in controller that seems to operate on SPI (judging by the pin labelled MOSI connected to it). I've checked all of the display's segments through the receiver's diagnostics and all of the elements seem to be working fine on their own.
FWIW, I've managed to reproduce the issue by shorting the Chip Select pin of the VFD controller to ground. I've already reconnected all of the ribbon cables leading to the VFD's board and I don't think this is the issue, but I thought it would be worth mentioning.
Here's the link to the service manual:
https://elektrotanya.com/cgi-bin/download2.cgi?dk=h657lly0kukadddpnqc97lqsfgpjf48fkhy18lk4j67pzah0&fid=296141&file=yamaha_rx-a2010_rx-v2071.pdfI'm fairly good with electronics repair so I'll try anything if it helps.
Any and all help is appreciated. Thanks!