Peale
Active member
Working on two K7000s - a 19" and a 25"
Instead of blowing fuses, I've been using a "lightbulb fuse" - eg if the 100W lightbulb comes on bright, there's a dead short and shut it down before it toasts something.
The 19" was working but had a blown tube. Replaced the tube, it fired right up. After I capped it I got C57 backward, and of course it smoked. Replaced it and the fuse was blown. Replaced that and it blew right away.
Testing revealed that the HOT was blown and C38. Replaced both...nope. Still a dead short somewhere. Solder work appears to be clean. Did find one resistor that the solder had puled away from the pad (the pad was fine). Resoldered it with no change.
The 25" had a blown fly. Replaced that, fully capped it, replaced HOT...blew fuse. Replaced fuse, HOT, and tested around until I found that C38 was also bad. Replaced it, fired it up...no, still has a dead short somewhere.
Both monitors appear to have an interesting issue with R98 and R99. They're both 2.2K resistors, but both are reading a dead short. Of course when resistors die, they go open. But I'm having a heck of a time finding the cause of these two.
Ideas?
Instead of blowing fuses, I've been using a "lightbulb fuse" - eg if the 100W lightbulb comes on bright, there's a dead short and shut it down before it toasts something.
The 19" was working but had a blown tube. Replaced the tube, it fired right up. After I capped it I got C57 backward, and of course it smoked. Replaced it and the fuse was blown. Replaced that and it blew right away.
Testing revealed that the HOT was blown and C38. Replaced both...nope. Still a dead short somewhere. Solder work appears to be clean. Did find one resistor that the solder had puled away from the pad (the pad was fine). Resoldered it with no change.
The 25" had a blown fly. Replaced that, fully capped it, replaced HOT...blew fuse. Replaced fuse, HOT, and tested around until I found that C38 was also bad. Replaced it, fired it up...no, still has a dead short somewhere.
Both monitors appear to have an interesting issue with R98 and R99. They're both 2.2K resistors, but both are reading a dead short. Of course when resistors die, they go open. But I'm having a heck of a time finding the cause of these two.
Ideas?
