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Monitor Control Board 4 Pin Speaker Out Connection

Hello everyone.

I have obtained a control board to convert a LCD panel into a monitor. It has a 4 Pin connector for a speaker out line. I have external speakers which require a 3.5mm line in, optical or RCA cables. I have no idea how I would connect the two. I have searched online but came up with no results for this. Here is a picture of the connector, it is circled in red. The Phone/Audio connector in the picture is a line in, not out.

Any help would be appreciated

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Hi,

Have you tried searching for the schematic for the control board by using the "board" number of the control board?

If it is a stereo audio output this would only require 3 wires, left channel, right channel and common, although the common is usually two wires one associated with the left channel and one with the right but basically it is the same wire.

If the control board is working and you can input audio either by the jack or with the HDMI connection or RCA etc and if you have a suitable connector to plug into the audio out socket, wire a speaker to it by connecting only two wires to the connector. Try an outer pin and the one next to it and check for audio.

It may be configured that the audio channels are on the outer pins and the common is the two middle pins but testing with a speaker may be the only way to know. Try different combinations until it works and you have stereo output

As long as you don't short out the pins and have a speaker connected across them it shouldn't damage the audio IC

Here’s how most 3.5mm stereo audio plugs are wired.

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Thanks for your reply mate. Unfortunately I cannot see the image you have attached, if you could post it again I would appreciate it. The seller of the board has stated that the pins are L+,L-, R+, R- . If this is the case there is no common. What are your thought?

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@Sumeet Saini

Sorry about the image it's here now.

I would say that L- and R- would be the same point which you may be able to prove with an Ohmmeter. Just place the meter across the two points i.e. R- and L- and it should read short circuit or 0 Ohms (zero).

if they are short circuit (there should be a resistance reading when you measure between the other pin combinations) then you could use a 3.5mm plug and wire the L+ to the tip, the R+ to the ring and the two R- & L- both to the sleeve

Since you have RCA input to the speaker which is usually two connectors L & R (left and right) just connect R+ to the centre pin terminal of a RCA plug and R- to the outer terminal of the same connector plug and the same with the L+ & L- to the other RCA plug and then insert the plugs into the appropriate L & R RCA input sockets on the speaker system

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Thanks mate, I will try this and report back!

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Did you have any success? I am having the exact same issue. And so far I am stumped.

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I have this same edp controller board. On the back of the board, of the speaker 4 pin connector there are pinout markers: L- L+ R+ R- the first and fourth pin are both GND and connect to the sleeve of a 3.5mm (TIP RING SLEEVE) TRS jack. L+ goes to TIP, R+ goes to RING. And that’s it :)
In fact, if you look on the usual internet stores you can buy a TTRS breakout board which makes it easy to solder connections to, they cost a buck or two.

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