Post by brokendenon on Jul 16, 2018 20:54:38 GMT -5
I've unhooked everything from the receiver, and using the button combination the service manual says to, it shows up as DC Protect. I am hoping it might be one of the channels I dont use(Surround back channels) that's causing protection to kick in, and maybe I can disable that channel or something, and be back up and running. But it's never that simple! haha
Page 50 in the manual explains how to bypass protection for testing. Once bypassed and receiver stays on you can test for any DC voltage on the speaker outputs with your DMM. Do not connect any speakers or inputs while in test mode.
Post by brokendenon on Jul 17, 2018 10:02:41 GMT -5
You surely know more about this than myself, but when I bypass the protection, the relays never engage that sends signal to the outputs. Normally, after it runs it's self-check(or whatever it's doing while the green light flashes as it boots up), there is a final click. In bypass mode, the click never happens.
Post by brokendenon on Jul 17, 2018 15:16:04 GMT -5
I don't really know how to read them. Idle current test on every channel (if I'm doing it right) shows 0 volts. Each side of the connector has ~22V. In fact, almost everywhere I measure on every channel has 22v.
Post by mastertech on Jul 17, 2018 16:52:49 GMT -5
Alright, lets try this. On the main amp board look for connector BN501. If this is a wire harness try disconnecting this harness and see if the receiver powers on without going into protect. It looks like it should stay on with this removed but lets see.
Post by brokendenon on Jul 17, 2018 17:24:12 GMT -5
Does it accomplish the same thing if I unhook the other end of that cable(CN761)? It's up top on the HDMI board, and I don't have it removed, yet, for access to the Main board. If so, I unhooked it and it acts no different... still going into DC protect before it fully boots up...
Post by brokendenon on Jul 17, 2018 20:03:54 GMT -5
Depending on whether I turn it off manually before it trips, or if I let it trip, the voltage while the unit is off is 3.2v and 1v respectively (strange, but I checked it several times to verify). If the voltage is 1 before I turn the power on, it flashes to a little over 3v(so fast it barely registers on the meter), then goes instantly to a couple mV. If the voltage is at 3 before I turn it on, it instantly goes down to a couple mV.
After it goes into protect, it lingers in the mV range for a minute or so, then starts building up to the 1v mark. If I turn it off manually before it trips, it also lingers....but builds up to 3.2v
mastertech: Merry Christmas to you too. Not many holiday people around any more.
Dec 26, 2018 14:37:50 GMT -5
stridsvognen: Merry christmas everybody...
Dec 24, 2018 19:10:58 GMT -5
mastertech: Sounds nice. Would love to have many more pictures.
Oct 20, 2018 20:31:04 GMT -5
greg1292: Greetings from Denmark. Lots of ideas knowledge and bucket list. Gabor boards looking very nice indeed
Oct 20, 2018 16:38:34 GMT -5
kevin5418: Anyone has the Velodyne hgs12bg MPS board schematic ? thank U
Oct 6, 2018 0:58:34 GMT -5
mastertech: According to the SM ic711 must be installed with the firmware already in it. It can then later be upgraded. The correct ic is around 50 dollars. If you installed a blank ic it will not work.
Aug 19, 2018 20:01:39 GMT -5
ralph: Hello mastertech, sorry for the delay, if I replaced that IC, I was with short circuit, blocked the 3.3 volt regulator, put a new one but still do nothing, what could I do? Thanks for the reply
Aug 18, 2018 21:48:51 GMT -5
mastertech: Did you replace ic711?
Aug 12, 2018 18:55:42 GMT -5
mastertech: Just to clarify you replaced ic711 (STM32F101ZG), correct?
Aug 10, 2018 20:58:16 GMT -5
ralph: Hello, Mastertech, I'll send it to you
Aug 10, 2018 18:58:46 GMT -5