For monitor related issues
mRCaESaR
Posts: 254Joined: August 21st, 2017, 8:42 amLocation: SydneyeBay: mr_caesar81Initials: JTL
Post by mRCaESaR April 15th, 2019, 6:54 am
Hey guys,
My ms8 had a vertical collapse the other day (will send to Jomac)
I'm replacing my ms8 with an MS9 which I had the MS9 monitor working 100% when I was doing some testing for my racing cab..
Even got it working to 24khz
Now for the love of God... I can't get a proper image on the monitor when I put a Pandora/jpac or raspberryjamma on my astro city.
It's like I need a VHOLD but I cannot find a VHOLD pot.
Anybody have suggestions?
Last edited by mRCaESaR on April 15th, 2019, 7:34 am, edited 1 time in total.
mRCaESaR
Posts: 254Joined: August 21st, 2017, 8:42 amLocation: SydneyeBay: mr_caesar81Initials: JTL
Post by mRCaESaR April 15th, 2019, 7:02 am
Video of image rolling..
On a Pandora's box..
https://youtu.be/qjtjjv1vZH8
On a RaspberryJamma
https://youtu.be/I_3X_9cfgdE
Sent from my SM-N950F using Tapatalk
grantspain
Tech Head
Posts: 4873Joined: August 17th, 2008, 4:23 pmLocation: down south
Post by grantspain April 15th, 2019, 8:34 am
i reckon that is a video ground problem, you may need to link the video ground pin 14 to ground pin 1
mRCaESaR
Posts: 254Joined: August 21st, 2017, 8:42 amLocation: SydneyeBay: mr_caesar81Initials: JTL
Post by mRCaESaR April 15th, 2019, 9:00 am
grantspain wrote: April 15th, 2019, 8:34 am
i reckon that is a video ground problem, you may need to link the video ground pin 14 to ground pin 1
I initially thought ground issue too...
I've checked continuity between all ground points and I get the good old "beep" on the multimeter.
Checked a different cab and still the same issue.
I'll continue to re-check
grantspain
Tech Head
Posts: 4873Joined: August 17th, 2008, 4:23 pmLocation: down south
Post by grantspain April 15th, 2019, 10:55 am
just want to point out that some jamma looms have video ground on pin 14 and some have it on pin 1, some game boards have video ground on pin 14 and some on pin 1- if you link 14 to 1 quickly then you can prove it
mRCaESaR
Posts: 254Joined: August 21st, 2017, 8:42 amLocation: SydneyeBay: mr_caesar81Initials: JTL
Post by mRCaESaR April 16th, 2019, 1:52 pm
grantspain wrote: April 15th, 2019, 10:55 am
just want to point out that some jamma looms have video ground on pin 14 and some have it on pin 1, some game boards have video ground on pin 14 and some on pin 1- if you link 14 to 1 quickly then you can prove it
its not a chassis fault 100%
Thanks. I'll test this out.
mRCaESaR
Posts: 254Joined: August 21st, 2017, 8:42 amLocation: SydneyeBay: mr_caesar81Initials: JTL
Post by mRCaESaR April 18th, 2019, 2:27 pm
Whenever the pcb is connected, pin 1 and 14 have continuity - still the same issue.
grantspain
Tech Head
Posts: 4873Joined: August 17th, 2008, 4:23 pmLocation: down south
Post by grantspain April 18th, 2019, 2:31 pm
also be aware the video ground is white on the nanao and sync is blue/white- if original wiring
mRCaESaR
Posts: 254Joined: August 21st, 2017, 8:42 amLocation: SydneyeBay: mr_caesar81Initials: JTL
Post by mRCaESaR April 18th, 2019, 2:42 pm
Yeah on the jamma harness sync is blue/white, but on the cable for the monitor it's grey and it's in the "H" section of the JST connector.
