WG6100 burnt hole repair

Zinfer

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Does anyone have an image of the screening from the backside of the deflection board? I've epoxied the hole and am in the middle of running a cap kit, replacing the R100 resistor, but I found this large resistor on the underside of the deflection board. Does this belong here or was this a hack?
Any pics of a normal working backside of a WG19k6100 would be great. Just looking to see a correct layout.
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That resistor is the wrong value but hooked up to the correct location since you are now missing the back of the pad. Personally, I would put an LV2000 in its place and you will never know the hole was there.

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Thanks Pat, I really appreciate those pics, however I couldn't help but notice there's an extra terminal under where R100 would be, unless that's just a solder fill of an empty hole.
Thanks for your valuable info. I just took a new R100 and ran one end of the resistor to the single terminal of the transistor. I think that should do it. I have the other half of the cap kit to run on this yet and I'll throw some final pics up.
With luck I'll be able to power this up and get a good screen. But I'm thinking this is going to need a tube change-and I've never done one of those. Especially on a vector.
 
Well it's not as pretty as I would like it as I currently have no way or knowledge how to actually replace a lifted pad but let me know how you think this looks. I think this should do the job.
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Still in the middle of this Deluxe cap kit/get well kit. On replacing the transistors with very large heat sinks on the deflection board, is it typical or easier to install the transistors by removing the entire heat sink x 4 or do you try to just leave the heat sink in and remove just the transistor. I know it's very hard to get to, to do that. U07 and U57's.
I'm thinking most that run this kit probably remove the entire heat sink and all to replace them but I just felt I'd ask to try and get a consensus on the best way to go about it.
 
Your fix looks good. Yes, that is just an empty pad hole filled with solder. If you can, remove the entire heat sink assembly with the transistor as it is very tight and tough to get to those small screws if you have big fingers. You can also do a nice job of re-coating the transistors with heat sink compound. You will have also less chance of ripping a pad off the back of the board. If you do, I put a small dollop of hot glue to hold the back side of the heat sink pad/let in place. Emphasis on small.

Those U57 and U07 transistors are getting hard to come by. Some of the factory transistors have alternate markings. Don't have my notes in front of me.
 
Thanks, I completed it last night. The only way to do it right is to remove the heat sinks and reinstall. I also found that the MPSU07's are also used in the G08's. I started looking for a few of these but it is very difficult to source them. I guess MPSU10's will work, but again, hard to find. I found one place with MPSU07's but minimal order was like 500, and the cost was well over $900.00.

Your fix looks good. Yes, that is just an empty pad hole filled with solder. If you can, remove the entire heat sink assembly with the transistor as it is very tight and tough to get to those small screws if you have big fingers. You can also do a nice job of re-coating the transistors with heat sink compound. You will have also less chance of ripping a pad off the back of the board. If you do, I put a small dollop of hot glue to hold the back side of the heat sink pad/let in place. Emphasis on small.

Those U57 and U07 transistors are getting hard to come by. Some of the factory transistors have alternate markings. Don't have my notes in front of me.
 
Were your transistors bad? Lately I haven't found any bad ones on my deflection boards. (Knock on wood) Fortunately, I have a stash of beat up deflection boards I can rob for parts until I can get my hands on some. How did it turn out? OK?
 
The deluxe cap kit came with replacements. I've not powered this monitor up yet, so I have no idea if they were bad or not. It'd be nice if I could find a supply of MPSU07's for my G08/Star Trek project.
Bill Boucher says MPSU10's will work - but those are as hard to find as the 07's.
I did find on Bills page however, a reference to a MPSW42G which is supposed to be a good cross reference.
 
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Ok, well I found Q604 MPSU57 was bad. The I must have fried the brand new MPSU57 that came with the BR super deluxe WGk6100 cap kit.
I keep finding myself battling the MPSU07 and MPSU57 thing. Both G08's and WG K6100's use them.
They are currently 5$ a pop at Bob Roberts site. I tried placing a request from Central Semiconductor for samples CEN-U57. Has anyone else had any success doing that?
Those things go pretty quick if you have any problems with your frame transistors don't they.
 
Too many numbers in my head. Don't get me started on Star Trek Q600 and Q700 cross references --ugh.
 
Minimum order at either Central Semiconductor or Mouser is 500 of the CEN-U57 or CEN-U07's. At around 1.70 to 1.80 per piece that's like $900 and 4 lifetimes supply worth.
Which leads me to wonder about WG6100 repairs in the future.
 
I have been doing this same project on my 6100 over the past few days. I know the kit comes with the two fuses but are these easy to obtain from, say, Radio Shack? Both of mine where blown and I accidentally cracked one of the new ones during installation. I think the other two fuses in the board are also blown so I have to replace those.

As a first timer I thought the kit was a bit confusing at times but after a while I think I figured it out. I guess I will know how it turned out when I put those fuses in and fire it up.
 
I've gone through so many fuses at least with F600 (3amp) that I just run down to Advanced Auto Parts and buy a couple 5 packs of buss fuses. They aren't slow blow. Nothing fancy, just a 3amp fuse.
I really don't like to be buying $5.00 MPSU57 transistors with a problem like this. I'm pretty sure that's what's blowing my F600 though not completely 100% sure.
 
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I've gone through so many fuses at least with F600 (3amp) that I just run down to Advanced Auto Parts and buy a couple 5 packs of buss fuses. They aren't slow blow. Nothing fancy, just a 3amp fuse.
I really don't like to be buying $5.00 MPSU57 transistors with a problem like this. I'm pretty sure that's what's blowing my F600 though not completely 100% sure.

You could possibly use alternates until you solve the problem

They are cheaper
MPSU-57 = MJE15033 *

MPSU-07 = MJE15032 *

* Note: Pinouts are different, so you will have to twist the legs to fix this
 
wow, yea. I wasn't aware of that alternate. I'll have to try that. Thanks alot dez.

You could possibly use alternates until you solve the problem

They are cheaper
MPSU-57 = MJE15033 *

MPSU-07 = MJE15032 *

* Note: Pinouts are different, so you will have to twist the legs to fix this
 
Success! Well, at least back to where I started from. I managed to get hold of a couple of MPSU57's today, well CENU57's anyways.
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I seem to have somehow made some progress on the jaggies at the bottom of the screen. Now the problem area seems to be lower middle. It's definitely something on the WG6100 deflection board. I swapped a working Space Duel WG6100 in there a while back and it was perfect.
 
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