Sony MEX-N5100BT Head Unit - diyAudio
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Old 17th January 2017, 05:09 AM   #1
diyAudio Member
Join Date: Oct 2016
Default Sony MEX-N5100BT Head Unit

My friend asked me to look at his CD player..

The Unit was working fine one day and the next day the unit is dead no lights no power no nothing..

I opening the unit up and looked for broken traces bad solder connections and found everything to be fine I even checked most of the diodes on the board and they test fine..

Since this is my first head unit im trying to repair im not to fimilar with them..

Anyone have any ideas what might cause this or where to start checking ?
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Old 17th January 2017, 05:40 AM   #2
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
I no longer repair head units but this is a good start...

Check the fuse first.

Confirm that the contacts for the face are clean. If the unit doesn't sense the face, it may not do anything.

If there is a reset button, try that.

Confirm that the voltage on the wires is getting to the traces inside the unit. Check away from the solder connections. A hit to the plug could break the trace but not be visible. I've also seen pins from the connectors burn before they reach the board.

Confirm that you have 0 ohms between the case of the head unit and the ground wire.

On older head units, you could see pulses on various pins of the microcontroller. This would let you know that there was some life in the processor.

Confirm that the various supply voltages are present on the microcontroller (generally available in the service manual -- available on eserviceinfo)

Confirm that the voltages are correct if the microcontroller has inputs for the face, backup and ignition power.
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