29/27 viewable Makvision tri-mode

[reaper420]

I just got a new 29/27 viewable Makvision tri-mode monitor for my mame cab

got it installed,  I'm using a arcade VGA card

the dispay is uneven, the bottom left and top right corners are bending outward / kind look like they are pulled in the corners

can see this in mame and its really bad in windows

, i have tried adjusting it and can not get it resloved

was hoping you guys might have some ideas


thanks

[MonMotha]

The adjustment for this is "pincushion" or sometimes "east/west".  If you have the analog one (knobs on the adjustment board and no on-screen display), the adjustment for this is probably on the mainboard, not the remote board.

The digital version may also have a "corner" adjustment.  That can be used as a last resort, but pincushion is the primary adjustment.

[reaper420]

it is analog , i have tried the pin but it adjusts both corners on the left or right side

its just the lower left and the upper right , so if i adjust the lower left to about where is should be, the upper left it way off and vice versa on the right

[MonMotha]

That control would be "trapezoid", if the monitor has one, which many do.

[reaper420]

it does have a trapezoid but it does the both top or both bottoms corners together

i need to just adjust one top corner, and one bottom

[MonMotha]

it does have a trapezoid but it does the both top or both bottoms corners together

i need to just adjust one top corner, and one bottom

Ok, then adjust BOTH parallelogram and trapezoid

[reaper420]

would be great if it had a parallelogram adjustment 

[MonMotha]

Check carefully.  It may be hidden somewhere in the middle of the chassis board.

What adjustments do you have available to you?

[reaper420]

This is what the manual lists

Contrast
Bright
v pos
v size
v hold
H hold
Pin
H size

Trapezoid
Rotation
V.line
S.cont
H. sub-hold
Focus
Screen

then the drives for the colors

thanks for the help

[MonMotha]

A picture of a grid test pattern would be handy.

[reaper420]

I Will try and get one posted tonight

thanks

[cnhartwel]

I have the same monitor, recent purchase and the same issue. Plus the colors are uneven, has purplish spots and I'm not sure if the left and right side of the monitor should be as unclear as they are. The middle the picture and colors are sharp, towards the edge the colors seem to separate and I can see the red green blue separation. Overall, definitely disappointed in the monitor, not sure if the issues are fixable or not

[Dawgz Rule]

I purchased my Makvision about a year ago from Happ when they ran a sale on them.  Since then, I have had a number of conversations with Keith in tech support.  The issues you describe are quite common with the Makvision monitors, especially geometry issues.  Mine has a slight horizontal linearity issue.  I have also noted some spotting which I was able to correct with a degaussing coil.  You can probably find it cheaper elsewhere but here is a link from Amazon.

http://www.amazon.com/Waldom-Degaussing-Coil-Color-Power/dp/B00011UYJU/ref=sr_1_1?ie=UTF8&qid=1333743576&sr=8-1