pconwell

I wanted to add my experience getting the Bar 48 back up and working. I can't speak for the Cinema 600 as this thread is for the Bar 48 - so my experience may or may not apply to the Cinema 600. Symptoms: The control panel and lights on the Bar 48 started flickering, then a few days later stopped working all together. Since the speakers still worked, I ignored the issue as an annoyance. However, after another day or two, the speakers became very staticky and then stopped working all together. After disassembling the guts of the Bar 48, I tested the volage on the 5v side of the power supply - being very careful to not touch any of the 120v parts on the same board. I tested the voltage between GND and VDD. It would show 5v, but then rather quickly started to drop. Around 4.6v, the lights would stop functioning. The STB is 3.3 v out (more on this below) and it turns the 24v power supply on and off. I'm guessing that's why my lights stopped working (dropped below 4.6v) but the speakers were still working (still above 3.3v). Eventually, the 5v side dropped below 3.3v and the 24v side turned off - or at least that's my guess. Side note: I don't have the proper tools to fully test capacitors, but I tested C05 and C06 as suggested by @ongtw75. C05 appeared to be not holding voltage, but otherwise seemed okay based on my rudimentary tests. C06 seemed to be fine. I replaced C05 with two 100uF capacitors but I still saw the same issues as described above. I didn't have the patience (or necessary replacement parts) to test the other capacitors, so I just moved on to replacing the entire power supply. Observations and Reverse Engineering: Based on other posts in this thread and my own testing, I am fairly confident the power supply is set up as follows: 5v side: VDD -> GND: 5v which is used to power the control board (lights, buttons, IR remote sensor, bluetooth, etc) STB -> GND: 3.3v when the soundbar is on* STB -> GND: 0.1-ish v when the soundbar is off* 24v side: V+ -> V-: 24v to drive the speakers *STB -> GNC is used to control the 24v side of the power supply. This supplies 3.3v from the control board back to the power supply when the power is turned on, so previous instructions to connect this to 5v+ are incorrect. You can either leave this unconnected or you can use it to trigger a relay (see below). If you really want to wire it to something, wire it to ground, not 5v+. But, if you are not wiring in a relay, the STB wire doesn't do anything so you might as well leave it be. Solution: I ordered this power supply and this relay. The relay is not necessary - but if you want to recreate the original functionality of killing power to the speakers, then the relay will do the trick. Otherwise, you can wire the speakers directly into the 24v side of the power supply and just leave them "on" all the time. Probably not going to hurt much either way, I just like the idea of keeping the functionality as close to original as possible. To keep things clear, I'll refer to the 3.3v STB wire as XXXX (the pattern marked on the wire), the 5v+ wire as Pink, the 5v GND wire as White, and the 24v + and - as Red and Black respectively. To begin, I made sure everything was unplugged. Next, I clipped all the wires connected to the old power supply. You likely want to verify that your colors match mine before you go snip happy. Next, I stripped and connected the AC mains power to the appropriate terminals on the new power supply. Mine was labeled AC-220v. The polarity does not matter. Then, I connected the Pink wire to the 5v+ terminal on the power supply. You will probably want to verify with a multimeter, but mine was the DC2+ terminal on the power supply. This will supply power to the controller board. I also connected a pigtail to the 5v+ terminal as well, which I will connect to a relay (this is optional). Next, I connected the White wire to the 5v- terminal, marked as DC2- on my power supply. Again, I connected a pigtail as well for a relay. At this point, you can test your setup if you want to. The controller board should power on. You should even be able to connect to Bluetooth, etc - but you won't get any sound yet. If you are not planning to use a relay, you can simply connect the Red wire to the 24v+ (DC1+ on my power supply) and the Black wire to the 24v- (DC1-) and you are done. The XXXX wire can be connected to the 5v ground (DC2-) if you really want to - but there is no need to connect it to anything. If you are planning to use a relay, instead connect Red to the NO (normally open) terminal and Black to the COM (common) terminal on the relay. Then connect your 5v+ pigtail to the DC+ terminal on the relay, and the 5v- pigtail to the DC- terminal. Lastly, connect the XXXX wire to the IN (trigger) terminal on the relay. Make sure the relay is set to HIGH switching. Now, whenever the soundbar is turned on, the STB (XXXX wire) will send 3.3v to the relay trigger (i.e. setting it high), causing it to close the "normally open" circuit. You can reference the attached schematic drawing. It doesn't really matter, but just note that the blue wire is 3.3v going from the controller board to the relay (when the soundbar is turned on). Again, STB (aka the XXXX wire) does not need to be connected to any 5v sources (or 24v sources for that matter). circuit (4).svg