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Hi all, recently i bought a french RGB master system 2 but has a problem in the image when power on, sound works perfect.

I tried with a different RVB cable and the problem persist, so the problem is in the console.

I do a little preasure in the video socket but nothing.

Any ideas? if i can't fix it i will back it to the seller.

I upload a photo to see the problem.

Thanks in advance

master system fallo imagen.jpeg (70.7 KB)

This looks like a sync issue; I know there is an issue with the sync signal provided by the RVB box that prevents it from working with the OSSC, perhaps this is the same issue?

I think there's a mod you can do to the RVB box's sync circuit that improves compatibility but I don't know the details, since it works by default with my Framemeister-based setup.

Nicole Express wrote

This looks like a sync issue; I know there is an issue with the sync signal provided by the RVB box that prevents it from working with the OSSC, perhaps this is the same issue?

I think there's a mod you can do to the RVB box's sync circuit that improves compatibility but I don't know the details, since it works by default with my Framemeister-based setup.

No, I checked the console with another RVB cable and the problem persist and check the cable with other console and the cable works perfect, so the problem is in the console

Have you tested this cable and console combination on a different television yet?

Some TVs don't work well with the Master System's sync output, so isolating the TV as the problem is worth a test.

Flygon wrote

Have you tested this cable and console combination on a different television yet?

Some TVs don't work well with the Master System's sync output, so isolating the TV as the problem is worth a test.

No, but I have other french RGB master system and works well, for that reason I didn't test it

law81 wrote

Flygon wrote

Have you tested this cable and console combination on a different television yet?

Some TVs don't work well with the Master System's sync output, so isolating the TV as the problem is worth a test.

No, but I have other french RGB master system and works well, for that reason I didn't test it

I see. I'd say test anyway, but that does lessen the likelihood.

can you open the console and check if there's continuity on the sync pin? there might be a cold join somewhere

sverx wrote

can you open the console and check if there's continuity on the sync pin? there might be a cold join somewhere

Do you mean to check the din 8 sync pin to the main board?

law81 wrote

Do you mean to check the din 8 sync pin to the main board?

yes, and if possible even back to the chip generating the signal

Fixed!!!
Sync pin was cutted but no visible , after fixed also red color was faulty and fixed.
I attach an image before fix, to the eye it seemed fine.

Screenshot_20230320_223340_com.android.gallery3d.jpg (1.26 MB)

law81 wrote

Fixed!!!
Sync pin was cutted but no visible , after fixed also red color was faulty and fixed.
I attach an image before fix, to the eye it seemed fine.

Cold solder joints right ?

nuno14272 wrote

law81 wrote

Fixed!!!
Sync pin was cutted but no visible , after fixed also red color was faulty and fixed.
I attach an image before fix, to the eye it seemed fine.

Cold solder joints right ?

Yes but I think the little ring of the pin was broken and if you see the photo you can see a little line. I attach a photo edited

MS.jpg (411.5 KB)

Author	Message
law81 Joined: 21 Oct 2015 Posts: 303	Image problem in French Master System 2 RGB model Posted: Fri Mar 17, 2023 4:37 pm
law81 Joined: 21 Oct 2015 Posts: 303	Hi all, recently i bought a french RGB master system 2 but has a problem in the image when power on, sound works perfect. I tried with a different RVB cable and the problem persist, so the problem is in the console. I do a little preasure in the video socket but nothing. Any ideas? if i can't fix it i will back it to the seller. I upload a photo to see the problem. Thanks in advance master system fallo imagen.jpeg (70.7 KB)

Nicole Express Joined: 30 Jul 2021 Posts: 13	Posted: Fri Mar 17, 2023 4:45 pm
Nicole Express Joined: 30 Jul 2021 Posts: 13	This looks like a sync issue; I know there is an issue with the sync signal provided by the RVB box that prevents it from working with the OSSC, perhaps this is the same issue? I think there's a mod you can do to the RVB box's sync circuit that improves compatibility but I don't know the details, since it works by default with my Framemeister-based setup.

law81 Joined: 21 Oct 2015 Posts: 303	Posted: Sat Mar 18, 2023 9:35 am
law81 Joined: 21 Oct 2015 Posts: 303	Nicole Express wrote This looks like a sync issue; I know there is an issue with the sync signal provided by the RVB box that prevents it from working with the OSSC, perhaps this is the same issue? I think there's a mod you can do to the RVB box's sync circuit that improves compatibility but I don't know the details, since it works by default with my Framemeister-based setup. No, I checked the console with another RVB cable and the problem persist and check the cable with other console and the cable works perfect, so the problem is in the console

Flygon Joined: 30 Jun 2016 Posts: 196 Location: Melbourne, Australia	Posted: Sat Mar 18, 2023 10:13 am
	Have you tested this cable and console combination on a different television yet? Some TVs don't work well with the Master System's sync output, so isolating the TV as the problem is worth a test.

law81 Joined: 21 Oct 2015 Posts: 303	Posted: Sat Mar 18, 2023 12:08 pm
law81 Joined: 21 Oct 2015 Posts: 303	Flygon wrote Have you tested this cable and console combination on a different television yet? Some TVs don't work well with the Master System's sync output, so isolating the TV as the problem is worth a test. No, but I have other french RGB master system and works well, for that reason I didn't test it

Flygon Joined: 30 Jun 2016 Posts: 196 Location: Melbourne, Australia	Posted: Sat Mar 18, 2023 3:08 pm
	law81 wrote Flygon wrote Have you tested this cable and console combination on a different television yet? Some TVs don't work well with the Master System's sync output, so isolating the TV as the problem is worth a test. No, but I have other french RGB master system and works well, for that reason I didn't test it I see. I'd say test anyway, but that does lessen the likelihood.

sverx Joined: 05 Sep 2013 Posts: 3823 Location: Stockholm, Sweden	Posted: Sun Mar 19, 2023 11:57 am
	can you open the console and check if there's continuity on the sync pin? there might be a cold join somewhere

law81 Joined: 21 Oct 2015 Posts: 303	Posted: Sun Mar 19, 2023 10:54 pm
law81 Joined: 21 Oct 2015 Posts: 303	sverx wrote can you open the console and check if there's continuity on the sync pin? there might be a cold join somewhere Do you mean to check the din 8 sync pin to the main board?

sverx Joined: 05 Sep 2013 Posts: 3823 Location: Stockholm, Sweden	Posted: Mon Mar 20, 2023 8:34 am
	law81 wrote Do you mean to check the din 8 sync pin to the main board? yes, and if possible even back to the chip generating the signal

law81 Joined: 21 Oct 2015 Posts: 303	Posted: Mon Mar 20, 2023 11:01 am
law81 Joined: 21 Oct 2015 Posts: 303	Fixed!!! Sync pin was cutted but no visible , after fixed also red color was faulty and fixed. I attach an image before fix, to the eye it seemed fine. Screenshot_20230320_223340_com.android.gallery3d.jpg (1.26 MB)

nuno14272 Joined: 10 Aug 2017 Posts: 31	Posted: Thu Mar 23, 2023 2:59 pm
nuno14272 Joined: 10 Aug 2017 Posts: 31	law81 wrote Fixed!!! Sync pin was cutted but no visible , after fixed also red color was faulty and fixed. I attach an image before fix, to the eye it seemed fine. Cold solder joints right ?

law81 Joined: 21 Oct 2015 Posts: 303	Posted: Thu Mar 23, 2023 6:32 pm
law81 Joined: 21 Oct 2015 Posts: 303	nuno14272 wrote law81 wrote Fixed!!! Sync pin was cutted but no visible , after fixed also red color was faulty and fixed. I attach an image before fix, to the eye it seemed fine. Cold solder joints right ? Yes but I think the little ring of the pin was broken and if you see the photo you can see a little line. I attach a photo edited MS.jpg (411.5 KB)

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