Author Topic: Help with Wei-ya G07 Replacement (Read 3436 times)

FrizzleFried · « **on:** December 05, 2006, 12:29:41 am »

Hello all...

I finally got the vertical cabinet up and running...well...sort of. I have a whole group of buttons that aren't working and I am having difficulty with the monitor...the button issues I think I can work out...but the monitor is another story.

It is the EYGO (Wei-ya) G07 replacement chassis. It was a horizontally oriented monitor before I cut up the cabinet and rotated it counter-clockwise.

The issues I am having include:

I can't get the monitor to reach the right edge of the screen (what was the TOP of the screen).

The right 1/3 (what was the top) has some geometry issues..and is squeezed...

The Geometry across the board is pretty crappy, but the right side is the worst (used to be top).

There is noticable curling at the right like the G07 used to do BEFORE the sync mod...is there a SYNC mod that needs to be done with this chassis?

Again...I just can't get the screen to go any further right (top)...

ANY help would be greatly appreciated.

PIX:

FrizzleFried · « **Reply #1 on:** December 05, 2006, 03:21:31 am »

Here are a couple more pix...it is plainly obvious that the right side of the screen is smashed together while the left is stretched a bit.

grantspain · « **Reply #2 on:** December 05, 2006, 04:39:29 am »

have you got a pincushion adjustment pot?

FrizzleFried · « **Reply #3 on:** December 05, 2006, 09:18:33 am »

...No pincushion pot that I am aware of....

grantspain · « **Reply #4 on:** December 05, 2006, 09:26:40 am »

no linearity or trapezium pots?

FrizzleFried · « **Reply #5 on:** December 05, 2006, 09:34:19 am »

Nope...it's an old school chassis...it has the usual: V-hold, V-position, V-Lin, H-Freq, H-Position, Brightness, etc...

The photos you see are after an hour of tinkering with it to get the best possible picture.

It is evident that either (A) I don't have something connected correctly, (B) I need to replace a CAP or two...or (C) This monitor is shot.

Notice the rough edges at the top and bottom...they are all over the board.... and on the right there are "rogue" scan lines...meaning they are detached from the picture by a scan line or 3...and then there is a line...look at the BLANK pic above at the right.

FrizzleFried · « **Reply #6 on:** December 05, 2006, 09:36:30 am »

....for full disclosure...I do have a broken pot on the neck...the GREEN adjustment pot is broken and needs to be replaced. I assumed that would only affect the GREEN on the screen and NOT the geometry...but I figured I should mention it just in case.

grantspain · « **Reply #7 on:** December 05, 2006, 09:55:06 am »

perhaps a few caps here and there,when you adjust the height and width pots does it affect the dissortion in any way?

FrizzleFried · « **Reply #8 on:** December 05, 2006, 10:36:42 am »

The width coil works as normal (but in this case stretches vertically of course being the monitor is rotated). The width frequency works as normal, with a "sweet spot" in the middle and it goes out of sync as you move out of the sweet spot. The vertical position will move the picture as normal, but maxes out at the position you see in my picture. The V lin appears to work as it does what it is suppose to with limited effect.

I even adjusted the B+ up and down the limits of the pot and not ONCE does it go further right than what you see...

That is why I suspect a bad CAP or misconnected wire or something. This is my 2nd monitor, so I am still a newb...but I managed to get my G07 up and running pretty damn spiffy and was hoping to do the same here...I am not much in to having to cough up another $180 for a monitor.

PS: Take particular note of the 2nd image down from the top...the MAME "warning" screen...look at the geometry of the border...it is just nasty...

grantspain · « **Reply #9 on:** December 05, 2006, 03:37:08 pm »

mame is it?

FrizzleFried · « **Reply #10 on:** December 05, 2006, 05:15:21 pm »

Key Layton...where are you? Be my savior!

You seem to have a pretty damn good handle on these chassis...

...something just came to me...perhaps this chassis requires a signal amp???

The G07 didn't (at least mine didn't)....

FrizzleFried · « **Reply #11 on:** December 05, 2006, 05:58:27 pm »

Quote

mame is it?

Yes sir, MAME running on a PC via a JPAC card and AVGA card. I have the exact same setup running a horizontal cabinet.

...and man, the photos do the image justice...cuz in real life the picture sucks.

grantspain · « **Reply #12 on:** December 05, 2006, 06:13:48 pm »

i guess you have swapped the monitors to check its not some sort of setup issue

FrizzleFried · « **Reply #13 on:** December 05, 2006, 06:26:03 pm »

The PC is running perfect on a PC monitor...and the arcade monitor in the cabinet is exhibiting the problems even with the jamma connector disconnected..

grantspain · « **Reply #14 on:** December 05, 2006, 06:33:22 pm »

was this monitor ever working perfectly,maybe you have some problems with the yoke config

FrizzleFried · « **Reply #15 on:** December 05, 2006, 06:38:47 pm »

That is the problem. I am not sure. I purchased this cab for $35.00. It included an "untested" monitor....maybe it's time to post a "whats the best cheap 19" monitor" post?

grantspain · « **Reply #16 on:** December 05, 2006, 06:43:17 pm »

you know yokes are not that difficult to set up,just check the painted stripe lines up and the yoke is in its home position

FrizzleFried · « **Reply #17 on:** December 05, 2006, 06:48:46 pm »

Are you referring to the purity rings? Remember, I am a newb here...I was proud of myself when I managed to discharge my G07 the first time without killing myself.

grantspain · « **Reply #18 on:** December 05, 2006, 07:34:08 pm »

yes the purity rings,this is the point of this forum-knowledge and learning

FrizzleFried · « **Reply #19 on:** December 05, 2006, 07:40:07 pm »

Exactly! And I want to learn. Can you either direct me to a place or you yourself give explicit instructions as to what I am attempting to do. I thought it may be the purity rings, but I wasn't sure if they would affect anything other than color. Can I touch them (they appear plastic). Is it safe to manipulate them by hand. You mention a "line" ... there is a line on the neck that I match the rings to?

Help me learn.

Thanks!

PS: I just googled "PURITY RINGS" and from the information I have read thus far, everything about the purity rings has to do with color, convergence, and greyscale...nothing to do with geometry issues?

Edit: Welp, I figured what the hell...nothing else is working...so I busted in the purity rings. I determined the 2 sets toward the rear of the monitor are for color and the set of two at the front (toward the tube) are for convergence. I can putz with the convergence and it DOES move the screen around A LITTLE...but it does nothing to help the geometry issues I have (left side stretched and the right side smushed).

Ken Layton · « **Reply #20 on:** December 06, 2006, 12:23:14 am »

If this is an "EYGO" version of the Wei-ya then it's at least a ten year old chassis and likely needs some new capacitors. Eygo was the USA distrib of Wei-ya and Eygo went out of business years ago. The current Wei-ya replacement chassis is the model 820H for an Electrohome.

You need to adjust the vertical linearity, Vertical Size, and vertical hold as they can all interact with each other.

FrizzleFried · « **Reply #21 on:** December 06, 2006, 01:47:49 am »

It is a PowerWise actually...but I think I am going to start with a CAP kit. I have adjusted all vertical adjustments with no luck....

grantspain · « **Reply #22 on:** December 06, 2006, 06:37:15 am »

i think a cap kit is the correct way to go,the yoke is not gonna cause those faults you have


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