Bringing back a MV4F to life: No sound Slots 3&4

TobyPC

n00b
Joined
Dec 8, 2014
Posts
48
Earlier in the week I repaired a NEO-253 on the top board of this 4 slot MVS board...

After toying around with this thing a little bit.. it appears the sound is working!..from slots 1 and 2 only...hmm.

Any ideas what can cause this? I've cleaned the contacts really well. What are the chances its just a cold joint in the socket?
31124397_10154792674099364_1955921427924254720_n.jpg
 

pnauts

Kuroko's Training Dummy
Joined
Jun 7, 2017
Posts
76
Hi, I have a similar issue, sound on 3 & 4 but with scratchy noises, sound is fine with the eye catcher (and in slot 1 & 2).
Why do you works on NEO-253 for ? the 4 on the bottom right are mux for videos, the top right is for Z80 bus multiplexing.
the Neo-G0 at B1 position is 68K data bus for slot 1 & 2
the one at D1 is the same for 3 & 4
the Neo-G0 at C1 is SDPAD & SDRAD for slot 1 & 2
the same for 3 & 4 at E1

I removed the Neo-G0 at E1 and still have sound and problem in slot 3 & 4 :confused:
 
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