Astro City sync issues?
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- DaveyD
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Re: Astro City sync issues?
Do you have more than 1 pcb to try in the cabinet? If so do they all act the same?
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Re: Astro City sync issues?
Yes, i try with a mvs slot and parodius pcb.
- Asayuki
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Re: Astro City sync issues?
Is video ground properly and actually connected?
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
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Re: Astro City sync issues?
You're right, it could be a ground problem, what can i check? Because with another chassis no problem.
- Asayuki
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Re: Astro City sync issues?
Look at the jamma pinout around on google. Near the sync pin there should be video ground. Try beeping from the chassis ground to the jamma board ground and see if there is connection. Some boards and some harnesses don't have connection there so you might want to check the obvious first.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
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Re: Astro City sync issues?
I have continuity between ground on chassis and video ground on jamma.
- grantspain
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Re: Astro City sync issues?
does the h.h 15k have any affect?
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Re: Astro City sync issues?
Yes but i can't stabilize picture.
- grantspain
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Re: Astro City sync issues?
i am not sure if i have seen that fault on that chassis before but the issue is with the horizontal hold circuit -pretty sure its not sync related
what is the history of the chassis?
what is the history of the chassis?
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Re: Astro City sync issues?
I bought it to a friend for spare, turn off directly after power on.
A capkit was done but 6 caps didn't have good values. I change bad caps, la7837 and la7853 and now it starts with this sync problem.
A capkit was done but 6 caps didn't have good values. I change bad caps, la7837 and la7853 and now it starts with this sync problem.
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Re: Astro City sync issues?
So what can i check? You think it could be a ground fault?
- grantspain
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Re: Astro City sync issues?
i really can't tell you what the problem is without having it infront of me
sometimes you have to admit something is beyond your skills
sometimes you have to admit something is beyond your skills
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- Eddhorse
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Re: Astro City sync issues?
If you arent gonna send it for repair, at least put up some pictures of the chassis.
I had a similar issue recently, grant had it fixed and back to me in a week. He is the expert.
The other thing is that i found was that my time is worth money, so spending 2 weeks looking at an issue, head scratching and reading page after page on the internet didn't solve my problem. It was beyond my skills and i was wasting my time.
My 2c
Ed
I had a similar issue recently, grant had it fixed and back to me in a week. He is the expert.
The other thing is that i found was that my time is worth money, so spending 2 weeks looking at an issue, head scratching and reading page after page on the internet didn't solve my problem. It was beyond my skills and i was wasting my time.
My 2c
Ed
- zak
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Re: Astro City sync issues?
What he said Grant is a level 11 wizard!Eddhorse wrote: grant had it fixed and back to me in a week. He is the expert.
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Re: Astro City sync issues?
hey, did you ever identify what the exact issue was? / how to fix?
my monitor has exactly the same problem
(sorry for bringing up an old thread)
- copados33
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Re: Astro City sync issues?
Check C452, its a plastic cap which is located on the solder side of the chassis pcb, it shoud read 1.0nF, if its bad you don't need to remove it, just place a good one over it, there are even actual solder holes/points on the parts side to place a ceramic cap in there, a bad C452 can cause v.sync issues when its on its last legs, but if you remove it or is completely burnt it will give you all sorts of problems.
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Re: Astro City sync issues?
thank you, will take a look!copados33 wrote: ↑October 8th, 2020, 12:54 pm Check C452, its a plastic cap which is located on the solder side of the chassis pcb, it shoud read 1.0nF, if its bad you don't need to remove it, just place a good one over it, there are even actual solder holes/points on the parts side to place a ceramic cap in there, a bad C452 can cause v.sync issues when its on its last legs, but if you remove it or is completely burnt it will give you all sorts of problems.