Unstable Output on one of my SC-55 RCA Outputs \ VOGONS

Unstable Output on one of my SC-55 RCA Outputs

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First post, by infiniteclouds

Posted on 2022-11-19, 20:14

infiniteclouds Offline

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My L output (White) on the SC-55 is extremely finicky. If the cable is even slightly moved or not caressed perfectly into position I will either get no output or chopped up output. I have verified it's not the cable or speakers by swapping the cables around.

What is the most common cause of this? I haven't take the board out to look underneath but from the top it seems like the entire RCA Input/Output is one single piece soldered into the board. Is this an easy fix/replacement?

Reply 1 of 5, by Tiido

Posted on 2022-11-19, 23:45

Tiido Offline

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Sounds like bad solder at the connector. It is an easy fix assuming soldering equipment is at hand.

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Reply 2 of 5, by infiniteclouds

Posted on 2022-11-20, 00:31

infiniteclouds Offline

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It looks like the RCA Input/Output (4 total jacks) is one piece that is soldered to the board, though ? Only the one port (L Output) has this issue.

Reply 3 of 5, by SuperDeadite

Posted on 2022-11-20, 02:37

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Could also be corroded jack or issue with the volume knob.

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Reply 4 of 5, by Shponglefan

Posted on 2022-11-20, 02:48

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Most likely cause of this is a cracked solder joint. I've had this happen on some of my sound modules. It's an extremely easy fix that just requires reflowing the solder on the joint.

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Reply 5 of 5, by Shponglefan

Posted on 2022-11-20, 02:51

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infiniteclouds wrote on 2022-11-20, 00:31:

It looks like the RCA Input/Output (4 total jacks) is one piece that is soldered to the board, though ? Only the one port (L Output) has this issue.

There should be at least 3 solder connects for the jacks (left, right and ground). If you remove the board and look at the underside, you should be able to see those on the underside of the board.

And if you post pictures of the board here so we can help make an assessment.

Pentium 4 Multi-OS Build
486 DX4-100 with 6 sound cards
486 DX-33 with 5 sound cards

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