odd Kortek symptom

[qrz]

referencing an OLD post here:
http://forum.arcadecontrols.com/index.php/topic,77766.msg811797.html#msg811797

had one today doing the relay click  as descibed.   found 14v source low - around 8v.
caps checked ok .
switched to resistance checks - vert out ok
did find a 24 ohm load off the output of  IC106 (5v line)

chased it to the neck board and then to B+ on IC801  WT6802

certainly didn't expect this . will have to order the chip as non stk item..........

[MonMotha]

You've got to be kidding me.  What the hell would make that part fail?  It's about as low power and isolated from anything major as you can get.

When ordering replacements, you might want to watch out as it's available in 4 different packages with various features exposed.  Looks like the 2914 uses the smallest, 16-pin package.  The stupid datasheet doesn't even give an ordering info section to construct the full part number for a given package.  You might just have to call the supplier up to confirm what they have.

[qrz]

a gassy CRT.

customer brought in that tube with another "working" chassis that died upon pwr up

once had that chassis going, had a nice purple glow on the gun assy' .
seems killed it fast enough to not undo the repair . ok on another tube.

at least it wasn't a full blown 2nd anode short. 
that kind of fireworks tends to get one's attention rather quickly.

'splains alot don't it ? 

[MonMotha]

I'm still a little surprised it took out something as straightforward and isolated as the OSD generator and nothing else.  I would have certainly expected the video pre-amp to be more exposed.  Was the cause simply a power/voltage excursion, and that chip happens to be the weakest and hence first thing to go?  If it fails shorted and shuts down the power supply, that would make sense.