Beomaster 4500 No Sound CH1 L/R, CH2 R.

The muting/speaker relay issue has been discussed elsewhere here, but I've seen no discussion or pictures of where it is or how to change it, internally. 

If this isn't the only issue, and the headphone jack needs replacing, how big an undertaking is that?

Thanks in advance for the help!

So I worked a bit more on this after reading other forum posts on the topic. The mute/speaker relay is probably what’s the cause of no left signal on Ch 1. It came back after cranking some music. Muting the channel will shut it off, and unmuting at low volume will get static from the left until I turn up the volume. Time to get that replaced.

That pesky speaker relay is marked “SPEAKER RELAY” on the PCB and is directly in front of the 2 pin DIN speaker jacks on the back of the unit.

I unplugged the headphone jack from the circuit board inside the case, and the right signal is still silent on both channels.

The headphone jack wires led to a green 4 pin connector on the main PCB behind this large capacitor and under the white tie strap.

The fact that the right signal is silent on both channels would rule out the speaker relay, wouldn’t it? Any other ideas from the collective brain trust here on what would give me signal on the left only?

I’ll keep updating this thread and posting pictures for posterity because I haven’t seen too many pictures of what’s inside of these.

I suppose you already checked the Balance control setting?

Martin

I did when I first received the unit. Pressing Sound read out "--79" on the 4 digit display. I couldn't adjust the balance. Likewise the treble, bass, and loudness couldn't be adjusted either and had equally nonsensical readings on the display. This was an issue I thought I'd try and tackle later fearing it would be some microprocessor issue. . . 

Anyway, I found a copy of the BM4500 service manual on line, and my mind was blown on what I was reading. This thing is way more powerful than just a receiver. The whole house control aspect of this system with MCL unit was something I was not fully aware of, and the system seemed like it was behaving like it was set up like a slave device on a whole house system. I'm still really fuzzy on how that whole system works, but I'll leave that mystery to another day.

After figuring out how to put it in Test Mode, all the microchips and memory checked out OK, I erased the RAM and restored the system to its default settings.

BINGO! I have sound from both channels, bass, treble, and loudness control! Balance reads '----' , treble and bass both read ' -- ', and pushing the up and down arrows actually turn loudness on and off.

My excitement was diminished after I powered the device down and unplugged it when I put everything back together and turned it back on. Back to sound only on one channel again!

So lather, rinse, repeat of wiping the RAM, but leaving it plugged in, and my settings were retained when I turned it back on from Standby. I have a working system as long as I don't lose power. But the fix is easy enough.

My logic is pointing me to the battery in the microprocessor box. The power in the system on Standby must be enough to store my settings while it still has power, but as soon as it loses power, it reverts back to old settings. 

Any other thoughts?

Thanks!

Have you