Macintosh SE Squashed Vertical - Analog board fault

[jake18125]

This is somewhat following on from a previous project where I had an SE/30 with a vertical failure (link at the bottom), so this is just a bit of context. 

With the SE/30 missing vertical I followed the dead mac scrolls, which suggested swapping the TDA1170 on the SE/30s analog board.

Unfortunately that didn't change the output at all.

Eventually I ended up with a broken SE that had a necked CRT, so I was able to swap the analog boards to verify that the SE/30s vertical fault was with the logic board and not the analog board, this eventually turning out to be a faulty 74ls393 counter - I only found that fault from the very helpful people here!

With my SE/30 running nicely I have turned my efforts back to the SE, and I'm hoping that you can help again. 

Once a new CRT had been placed into the SE, the video that is being outputted is incredibly squashed, with I think visible scan lines and a very bright line at the centre. 

Adjusting the potentiometers had no effect, leading me to wonder if when I replaced the TDA1170N I made a mistake somewhere.

The good news is that it is displaying video! The blinking floppy can be seen when it is powered on.

If anyone else has seen this before or has any ideas please let me know!

Link to my SE/30 woes are hear: 

 

[techknight]

Woah! that CRT is so bright from the vertical collapse you have to be SUPER CAREFUL. you can burn that right into the CRT and once you do get it working again, its going to look like ass and start tripping out your OCD while trying to use it. (Not like I know this from experience or anything) 

Give us good close-up pictures of the vertical section of your analog board. Both sides of the PCB Preferable. 

And you made sure this isnt a logic board problem? 

 

[jake18125]

Woah! that CRT is so bright from the vertical collapse you have to be SUPER CAREFUL. you can burn that right into the CRT and once you do get it working again, its going to look like ass and start tripping out your OCD while trying to use it. (Not like I know this from experience or anything) 

Give us good close-up pictures of the vertical section of your analog board. Both sides of the PCB Preferable. 

And you made sure this isnt a logic board problem? 

The CRT already has screen burn from its previous life, turns out it was the TDA1170!