Greetings,
I had my SE/30 running all of last weekend for a #Marchintosh project I was trying. While it was on, I turned the brightness knob to blacken the internal CRT. On Monday, I turned it back up, but I had to go to full Maximum before I could start to see any image, and the image that was there was completely stretched off of the physical bounds of the CRT (see attached photo). The horizontal is extremely stretched and the vertical is compressed but cuts off half of the display. My primary display is an external VGA with an SE/30 video card from zigzagjoe.
I opened the case and adjusted the brightness (the camera is making it seem brighter in the photo), stretching, etc. potentiometers to no avail. I physically checked the flyback transformer and the analog board with no apparent issues. I had reflowed and recapped the analog board 18 months ago. I recapped the logic board 2 years ago. I have a modern babyface power supply.
I thought maybe there is an issue with the CRT, particularly because the brightness hardly works any longer. I had a spare CRT from a junked Classic. I swapped in the other CRT, but it behaves in the exact same way. This means the only suspect (to me) is something on the analog board is no longer driving the CRT properly: very low brightness, mistimed driving of the horizontal and vertical scanlines, etc.
Any ideas what this could be and how to fix? Thanks!
I had my SE/30 running all of last weekend for a #Marchintosh project I was trying. While it was on, I turned the brightness knob to blacken the internal CRT. On Monday, I turned it back up, but I had to go to full Maximum before I could start to see any image, and the image that was there was completely stretched off of the physical bounds of the CRT (see attached photo). The horizontal is extremely stretched and the vertical is compressed but cuts off half of the display. My primary display is an external VGA with an SE/30 video card from zigzagjoe.
I opened the case and adjusted the brightness (the camera is making it seem brighter in the photo), stretching, etc. potentiometers to no avail. I physically checked the flyback transformer and the analog board with no apparent issues. I had reflowed and recapped the analog board 18 months ago. I recapped the logic board 2 years ago. I have a modern babyface power supply.
I thought maybe there is an issue with the CRT, particularly because the brightness hardly works any longer. I had a spare CRT from a junked Classic. I swapped in the other CRT, but it behaves in the exact same way. This means the only suspect (to me) is something on the analog board is no longer driving the CRT properly: very low brightness, mistimed driving of the horizontal and vertical scanlines, etc.
Any ideas what this could be and how to fix? Thanks!
