HELP video error

Sync issue of some kind. Try a different monitor or tweak what you have if possible (PVMs for instance will let you manually adjust sync on the back of the screen).

 

Maybe 5v is too high or too low.

 

it could be i was thinking voltage wise . i dont think its the vertical sync it might be though..or it could be a broken leg on one of the roms cos i think i have found one i will inc a pic soon.

thanks for your help



ok here is the pic what do you think it looks like it has been fixed..

 

Looks like what happens on an MS9-29 monitor when sync changes at source (a la Arcade VGA)

I'm not sure if the wiring in an Astro alows you to unplug power to the monitor independently, but if you can, try that after it the game has booted and then plug it back in again

 

ok i will give it a go cheers

 

no joy:shrug:

 

Have you tried adjusting HSync?

 

...or H HOLD or both

 

the only tv controls i can see on my astro city are the ones under the panel but their just screen coverage / brightness ect.

 

They are on the back of the chassis... I think, from memory

 

They are on the monitor chassis (not the remote board under the panel) It's the large PCB attached to the monitor frame, not to be confused with the neck card

There are various trim pot controls on there to adjust the geometry.

You will need to get into the habit of adjusting these whenever you change a PCB, it's not unusual for PCBs to have slightly different resolutions, frequencies etc

 

thanks for helping but i only found 2 dials on the back of the tv and they did nothing

 

What's the model number of the chassis?

Should be a sticker on it, or possibly on the silkscreen of the chassis

 

If you can take some pics of it even better

 

all i can see is m68jua068x on the back of the tv and the dial was 95km and the other dial i can not see..

pics




http://img294.imageshack.us/img294/5442/dtgc.jpg


http://img832.imageshack.us/img832/8066/dfg2.jpg


http://img259.imageshack.us/img259/478/dfg3.jpg

 

These are your geometry pots (highlighted in pink)

Wipe some of the dust off so you can read what's printed on the silkscreen in front of them. You will need a screwdriver (or ideally a trimming tool) to turn them. They can be a little fragile, so be gentle.

You want to adjust HSYNC and HHOLD.

The monitor needs to be on when adjusting, so be VERY careful not to touch anything else, and only put one hand in at a time, put the other hand in your back pocket.

 

arrr:drool: i am so dumb cheers aryssor thank you very much:thumbsup:

i will give it a go later

 

No worries, let me know how it goes!

 

ok i have

r cut off

b or 6 cut off

? cut off

sub cont


next to that i have


abl

h.h24

h.h15

para

spc24

m.s l1m

spc15

trap

v.lin

v.s limit

 

h.h15

Horizontal Hold 15khz

This is the one you want.

Should be H Snyc and V Sync somewhere else on the board too