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Hello. I just got this PAL Alex Kidd Master System II from a flea market. When turning it on, I got what you see in the attached file. I think it may be a faulty BIOS and thought about replacing it, but came to a bump. Any ideas?

master system.jpg (160.08 KB)

Faulty Master System

It looks like bad connections to the VDP. Can you test that?

How should I do that?

You would need a continuity tester and then various soldering tools to fix it.

That I got. But this is my first time with a SMS2 and I'm not sure about how to proceed.

IC5 (315-5246) is the VDP.
IC6 and IC7 are VRAM (D4168C-15).
IC9 (Sony CXA1145) is the video encoder.

A schematic can be found in the service manual which is located here: http://www.smspower.org/Development/SegaMasterSystemIIServiceManual

Good luck!

With my (very extremely) limited electronics knowledge, I've been testing but I don't seem to find anything amiss.

What have you tested and found so far (and how have you done it)?

Author	Message
SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	Any help fixing a glitchy PAL SMS 2? Posted: Sat Apr 14, 2018 11:43 pm
SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	Hello. I just got this PAL Alex Kidd Master System II from a flea market. When turning it on, I got what you see in the attached file. I think it may be a faulty BIOS and thought about replacing it, but came to a bump. Any ideas? master system.jpg (160.08 KB) Faulty Master System

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14744 Location: London	Posted: Sun Apr 15, 2018 12:47 am
	It looks like bad connections to the VDP. Can you test that?

SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	Posted: Mon Apr 16, 2018 10:57 am
SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	How should I do that?

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14744 Location: London	Posted: Mon Apr 16, 2018 12:13 pm
	You would need a continuity tester and then various soldering tools to fix it.

SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	Posted: Mon Apr 16, 2018 1:13 pm
SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	That I got. But this is my first time with a SMS2 and I'm not sure about how to proceed.

asynchronous Joined: 14 Aug 2000 Posts: 742 Location: Adelaide, Australia	Any help fixing a glitchy PAL SMS 2? Posted: Mon Apr 16, 2018 1:40 pm
	IC5 (315-5246) is the VDP. IC6 and IC7 are VRAM (D4168C-15). IC9 (Sony CXA1145) is the video encoder. A schematic can be found in the service manual which is located here: http://www.smspower.org/Development/SegaMasterSystemIIServiceManual Good luck!

SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	Posted: Thu Apr 19, 2018 4:35 pm
SGBJavi Joined: 14 Apr 2018 Posts: 4 Location: Spain	With my (very extremely) limited electronics knowledge, I've been testing but I don't seem to find anything amiss.

asynchronous Joined: 14 Aug 2000 Posts: 742 Location: Adelaide, Australia	Any help fixing a glitchy PAL SMS 2? Posted: Mon Apr 23, 2018 1:15 pm
	What have you tested and found so far (and how have you done it)?

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