XM1801 Monitors Dead or Alive?

Jeff M

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I've got a couple of red tent monitors that are driving me nuts. I have one that was giving me a white flickering screen so I capped it and put in a new hot with no luck. The other monitor is showing a white bar across the middle of the screen and also popped in a new cap kit and hot with no luck still. What could be causing these problems?
 

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what is the B+ on them.

pic one, you need to turn down the raster.

pic two, looks to be partial vertical collapse. possible cold solder joint or cracked trace.

and you are using a isolated 100v transformer to test them with correct.

they are almost the same as the sanyo and need isolated 100 volts for input power.

Peace
Buffett
 
I'll check the B+ when I get home this evening.

I'm still new to this but where can you turn down the raster on that monitor?

Also I've got it hooked up to the original transformer for 100v.

And I'm pretty sure the one with horizontal collapse is due to the c506 cap. Because that little round silver colored contact came off when I was desoldering it and in a moment of stupidity I tried to solder the cap on and still and kept going.
 
check all your work very thoroughly.

any part not in correctly will cause problems.

turn down the raster with the screen knob on the fly back.

Peace
Buffett
 
Sharp 18" monitors are a pain in the ass.. Be very careful with the yoke and tube.. As the slightest bump and you'll be out a tube :(

Cap the whole thing, reflow every single solder pad.. Even the neck.. I've got a couple here that I've brought back from the dead.. But I need tubes..
 
Well I couldn't find out the B+ due to my buddy losing my multi meter today of all days. But playing around this is the best picture I can get so far. Also that's with the brightness on the flyback turned all the way down. If you listen closely to the board you can hear a small clicking noise every few seconds.

I'm crazy paranoid about being careful around the neck board and yoke. If I snapped that thing there's a pretty good chance you'll hear me from where your at. I'll go through all of the solder points and double check again to make sure.
 

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the 1801 could have lots of dif things going wrong with it so I wouldn't be good at suggesting anything with your input about it so far. If you hit a dead end and want me to take care of it please don't hesitate to take advantage of my services.. it is on the harder end of monitors to work with.

Chad.

I've got a couple of red tent monitors that are driving me nuts. I have one that was giving me a white flickering screen so I capped it and put in a new hot with no luck. The other monitor is showing a white bar across the middle of the screen and also popped in a new cap kit and hot with no luck still. What could be causing these problems?
 
the snapping can be several things on monitors especially on the Sanyo and XM1801.

having to high of a B+ will make it do what it is doing on your monitor.
you really need to get it checked before you go any further.

the fly back could be failing.

and make sure you have the degauss and dag wire connected properly.

clean the anode hole it could be arching from there.

Peace
Buffett
 
I check the B+ and it was holding around 110.7v-110.8v and double checked the degauss which everything looked right. I compared the sharp to the other 3 I have and everything looked almost the same except for the 5 inches of dirt on one of them.
 
Well I think that rules out a failing flyback.. Has this monitor been capped? Sorry if I missed that..

Reflowing solder has done wonders for my red tent chassis..
 
Yep I capped the board last weekend. I've only reflowed solder to just a few points that looked off. But I haven't gone through and reflowed solder to the whole board yet.
 
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