SI-327V The image is undersized and bulging

[bfauska]

I just picked up a monitor that I was warned had some image size issues (described as 3" from filling the screen from top to bottom) and when I hooked it up what I saw was actually 3" from both the top and the bottom, and some width problems to boot. When I adjusted it using the OSD i could get the size a little better but once it was maxed out it was still way smaller than the screen, it also has an odd lump in the image.
The monitor is an SI-327v which from what I've seen online (not much) is totally different than an SI-327, it's got a vga connection and apparently that means an entirely different board. The video below shows the image issues and there's some pictures of the labels too if they help.







Please tell me there's a way to make this work, I'm willing to solder and/or figure out a list of caps for this board if it seems like that's what it'll take.

[bfauska]

No help? Really, come on there's some great monitor minded folks on here, am I leaving something out that would help diagnose? Does it seem to be chassis or tube related? Are there other VGA chassis that I could easily toss on the tube?

[grantspain]

i would say wrong chassis for tube,bet the yoke does not match the chassis

[bfauska]

What do I need to do to verify that? Is there a way with the WG model number for the monitor or the model number on the RCA tube to find out what chassis options I have?

[grantspain]

that tube was from a k7500 and i am sure they had a very perculier deflection yoke as it was a fixed 25khz chassis-very rarely seen chassis in europe tbh so not much experience on them,only worked on one
i do not know the yoke spec of the sharp image chassis but you said it had a vga connector-that would then point towards the chassis having something like 0.195 to 0.300mh horizontal inductance

first thing you need to find out are the yoke specs for the sharp image chassis

[bfauska]

I would love to use either the chassis or the tube to get this working on my cabinet. I'm running an old Dell with onboard VGA and an AGP port, the simplest solution, I think, would be to find a way to use this card and a compatible tube. Otherwise I think I'd want to head down the soft-15Khz path but do we think that would be compatible with the onboard graphics on the Dell?

How do I find the yoke specs for the chassis? Or the tube? Then how do I find out what would be compatible? I've always had large VGA compatible CRT monitors in the past so if I depart from this path there is going to be a big learning curve I think, which I'm willing to undertake but it kinda seems daunting if I don't have to.

[lilshawn]

How do I find the yoke specs for the chassis? Or the tube? Then how do I find out what would be compatible? I've always had large VGA compatible CRT monitors in the past so if I depart from this path there is going to be a big learning curve I think, which I'm willing to undertake but it kinda seems daunting if I don't have to.

mixing random parts never works out well. i'm surprised this thing hasn't blown up yet. a yoke even a few millihenrys out from what the circuit on the board is designed for will blow parts right quick. perhaps this is kinda close.

[ed12]

ya thats an odd tube ?
attached is a .zip that when opened is a office (execel) spread sheet
your tube is found in the 27' rca line
110 degree
it will not be fully listed but u can get a good idea of the yoke used.
maybe rick will chime in with a up-date ?

ed

[lilshawn]

A yoke designed to run at 15khz or 25khz won't run real great at 31khz. much like a bell, a yoke is designed to resonate at a specific frequency. running a yoke outside those frequencies makes it run really hot and will eventually burn out because the induction and resonance work against each other.

this was an issue with early switchable u5000's. they where basically 15k monitors forced to run at 25k.

K7400, U2000, and U5000 all use the same yoke and tube. Chassis can be swapped from the tube of one to the tube of another with no changes.

K7500 uses a completely different yoke and needs to be matched with it specifically.


side note..."rickn" has basically left the forum and currently has no plans on returning. should you need his assitance, you should probably contact him directly via e-mail or telephone.

[ed12]

yup
and thk's for the head's up.

from looking at the nick's posted pix's,that look's like a normal 26" yoke ?
not a 110 % kind that i would noramlly see..
maybe i can snap a pic of the proper yoke #'s ? or some one else will chime in with them ?

ed

[bfauska]

Just to clarify what I think I'm reading...
The tube I've got is an odd one and could be hard to find a proper board for? If that's the case I'd gladly ditch the tube and get a different one that could work with the board so that I get the VGA capability. Or am I reading this wrong?

[ed12]

same kettle different fish..
try to get a kv75xx and yoke chassic.

ed

[lilshawn]

Just to clarify what I think I'm reading...
The tube I've got is an odd one and could be hard to find a proper board for? If that's the case I'd gladly ditch the tube and get a different one that could work with the board so that I get the VGA capability. Or am I reading this wrong?

actually, quite the opposite....the K7500 series chassis is one of the most popular monitors out there. Wells gardner made literally hundreds of thousands of them.

if that tube is in good condition with no burn in and from your video, appears nice and bright still, maybe trying to locate a K7500 series chassis is going to be your best bet. I'll have a look in my pile, maybe i have one kicking around. I have a 4 foot rack section 9 feet high stacked with old chassis.

then you can run this monitor with a soft15k or the like.

[bfauska]

I'd love to give that a shot if I (or any of you can find one). If you find one shoot me a cost and I'll see if it sounds like I can make it happen.

[lilshawn]

okay will do then. I'll dig around and see what i have... I should get a PM to you by the end of today. I'f I don't just send me a reminder, i tend to get sidetracked easily and have a memory like a sieve.

[lilshawn]

I grabbed a chassis off the rack that I thought was a k7500 chassis but upon closer inspection it is a k7400.

I'll keep on the hunt Monday when I'm back at work.