The NEW Build Your Own Arcade Controls
Main => Monitor/Video Forum => Topic started by: lettuce on June 06, 2008, 12:16:04 pm
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Just got my Pentranic monitor today, and have noticed a strange display problem on the right hand side of the screen, i cant see any option on the menu screen that would relate to this, so was woundering if anybody had any suggestions?
(http://img373.imageshack.us/img373/2318/img1912be3.jpg)
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I've had that happen on all sorts of crt sets. The one thing you can do is to adjust the Hsize and Hpos to move the "squished area out of the screen. Often once you adjust the hsize you get pin cushioning. I always see this happen when you feed certain horizontal resolutions. Have you tried other boards on this monitor to see if you can give it a resolution that it likes? I have read a lot of people talk of compression on the sides of the screen, and it came that way from the factory.
Adjustable settings
Convergence looks perfect,
tpin is off (top pincushion)
Hsize and hpos could use adjusting
vsize and vpos could use adjusting
Does this monitor have a service mode? If it does you will most likely want to feed your set its rated resolution and run its inbuilt geometry crosshatch, and tweak from there.
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Hey that looks just like my Betson! :laugh2:
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Often once you adjust the hsize you get pin cushioning. I always see this happen when you feed certain horizontal resolutions.
Adjustable settings
Convergence looks perfect,
tpin is off (top pincushion)
Hsize and hpos could use adjusting
vsize and vpos could use adjusting
What do you mean by 'Pin cushioning' and 'top pincushion'? Apparently there is a advance menu for this monitor, well grantspain said there was. I remember recreating this sort of effect on my TV i had in my last cab, when messing about with the service menu display options
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If your monitor features both paralleogram and trapezoid adjustments (usually only found on "digital" monitors), you can sometimes use those to fix this at the expense of a slight pincushion. Use paralleogram to skew the whole monitor one way, fix it on one side with trapezoid, then use pincushion and pinbalance to fix up the other side. The resulting edges won't be quite as straight, but it can help with the squish effect. You can restore the appearance of straight edges by overscanning the video ever so slightly.
qrz: any idea what the cause of this might be? I'd have to guess high ESR or poor tempco leading to reduction in capacitance as DC voltage changes somewhere in the horizontal section, but I'm far from a monitor guru. I'd just like to know how to fix it. The Kortek/Betsons are famous for this, but it does appear to vary with what lot you get, suggesting it may just be a poor component substitution.
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I dunno what causes it mate, im contact Pentranic on Monday to see what they suggest, if they dont have an idea ill ask if they can send a replacement and swap them over, Pentranic isnt a massive company surely they test the monitors before shipping them out, i mean this is blatantly obvious i noticed it straight away
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It's also likely perfectly acceptable to them. MANY MANY large monitors exhibit geometry like this. It's downright HARD to get them as perfect as people on here would like. The people are here are a very different market than either most home TV users or a normal arcade. Normal arcades don't care as long as it's close, and, well, most home TV watchers are stretching 4:3 content to 16:9 without noticing.
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Why is it always the right side with the issue? I also have an HD 16:9 CRT TV (Samsung) and it has the same issue on the right side. It wasn't too noticeable until I went into the service mode to reduce the factory overscanning.
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Yep, I've probably seen more TV's and monitors that had this problem than I've seen that don't. It's a nightmare to take it to a repair shop or try to tell the manufacturer. Like someone else said, they consider this to be within the acceptable limits of a good picture.
I took my 37" tv to get repaired and gave them a long laundry list of things that I wanted fixed and the guy just looked at me like :o, like "I can't even believe this guy knows about this stuff or even cares." Gotta give it to the guy though, the thing came back with better geometry than I've ever seen on similar TVs.
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Yep, I've probably seen more TV's and monitors that had this problem than I've seen that don't. It's a nightmare to take it to a repair shop or try to tell the manufacturer. Like someone else said, they consider this to be within the acceptable limits of a good picture.
I took my 37" tv to get repaired and gave them a long laundry list of things that I wanted fixed and the guy just looked at me like :o, like "I can't even believe this guy knows about this stuff or even cares." Gotta give it to the guy though, the thing came back with better geometry than I've ever seen on similar TVs.
I like your style, every time I try and have someone repair something for me they look at me like, why dont you just buy a new one, and blow me off :).