monitor recap fubar

ikarispy

New member
Joined
Jun 21, 2009
Messages
166
Reaction score
4
Location
Ohio
What would happen if someone put his first monitor cap kit in, and in his excitement, neglected to clip the leads off of the last cap installed. Causing the legs to contact the harness? Hypotheticlly of course. Would the cap be the only thing affected, or would it cause a chain reaction of misery? Would it possibly cause the monitor to do not so funny things, and then display a light in the middle of the screen like the light at the end of that last tunnel and fade to black? Any thoughts?
 
Which monitor and game did this hypothetically happen with?
 
Sounds like a real life mess up to me, it all depends on where the cap is in the circuit and what role the cap plays. You could have simply killed the cap or caused the dreaded chain reaction you speak of. Either way, it's a mistake you'll only make once. Now all you need to do is take a live blast from the anode wire.
 
I've seen it happen and all that resulted was a blown fuse.

Assume for a moment that the cap is in the highest voltage line that is not HV (as that typically goes straight from the flyback to the tube). This means that you may have about +160vdc at most that just shorted to ground, pulling your amp draw out the roof. Hopefully the fuse would blow, although whatever the weakest point in that circuit (resistor, diode, etc) is going to be the part that dies. It could conceivably take you quite a while to trace through that circuit (in both directions) to find all the parts that failed (could be more than one). Also, as the chassis is mounted to the frame, and you just ran a bunch of voltage to it, anything on the ground circuit could have gotten a huge jolt on the ground pin - including the video proccessing IC.

Still, check your fuse, change the cap (just in case), and see what it does. And let us know the make and model next time if you want more specific answers.


On a side not - the admin either needs to move this forum below the Monitor forum, or delete the Monitor forum altogether, as it seems we get 2-3 monitor help question in here every day, instead of in the forum created especially for it....
 
I had that happen to me. Hypotheticlly of course. :D It blew the entire horizontal section of the monitor...
 
Which monitor and game did this hypothetically happen with?

It's a hantarex 19". The only numbers I could find were NE04 and 53840040 on the neck board cover. There's a nice sticker on the side of the chassis to list stuff like model no., ser. no., and such with absolutely nothing on it! On the neck board itself, it says NE04 and 50142900.
 
Sorry about the post. I screwed up and put this in the wrong forum. I had a rotary stick rebuild question for the same game, but at the last second I thought this was more pressing and should work on this first. I forgot to switch forums. I'm not that guy, really!! I swear!!
 
Sounds like a real life mess up to me, it all depends on where the cap is in the circuit and what role the cap plays. You could have simply killed the cap or caused the dreaded chain reaction you speak of. Either way, it's a mistake you'll only make once. Now all you need to do is take a live blast from the anode wire.

The cap is/was the c25 pos. on the harness. It's a 47 uf 50v that appears to be one of or last stop to the -5 v (black) wire to the neck board. R 175 looks abit toasty on the harness, as does r 144 -r 145 on the neck board. Fuses are good though.
 
You might get lucky and just ruined the parts in the same trace as your cap. Follow it forware and backwards till the parts you are checking seem good. Look at a manual and find out the exact values so you know when testing.
 
replaced the long legged cap of misfortune and checked manual for component values to and fro. everything checks out except for a resistor on the crt base (I was calling it a neck board) r 144 is reading open. this appears to be the last stop to/from the tube. 1 - do I need to remove this from the circuit to test for sure and 2 - how important is this component? i.e. does it need replaced before i continue, or will i cook something else? the value should read 2.7 ohms, per the manual. btw the monitor is a mtc 900e in an ikari warriors game.
 
pulled r 144 and checked again, came up 3.1 ohms. buttoned the chassis back up, turned on the game the first time, nothing. tried again, and the monitor came on with just red, and black. It ran for about 10 mins. and while i was looking around i heard the game reset. you know t t t...t t t...dunna dunna dumb...wha wha wha wha. anyway, i came around the front to check what the monitor was going on, and it was doing the whole light at the end of the tunnel trick and that was it. monitor gone, again. is there a safety shut off on these monitors that would shut them down. anyone have any senarios as to what would cause the monitor to shut down. like i said both times about 10 mins., shutdown.
 
Back
Top Bottom