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Post by jeremy on Nov 20, 2014 22:08:45 GMT -5
Ok I was able to check CX121, it splits into 2 separate connectors, one 4 pin and one 8 pin which both go to the Digital/HDMI board. The 5v reading on pins 1 and 3 read +5v. Pins 6 and 10 read 0.000vdc
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Post by jeremy on Nov 20, 2014 22:10:45 GMT -5
Ok I was able to check CX121, it splits into 2 separate connectors, one 4 pin and one 8 pin which both go to the Digital/HDMI board. The 5v reading on pins 1 and 3 read +5v. Pins 6 and 10 read 0.000vdc
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Post by mastertech on Nov 20, 2014 22:33:35 GMT -5
I checked CX031, it reads +17.88vdc . I couldn't check for DC since I couldn't find where to test off of (I cannot access the bottom of the CPU power board so I have no idea from the top where I can test off of) You should be testing for AC voltage on CX031, not DC. Of course you should not have gotten 18v DC either. Please reverify. |
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Post by mastertech on Nov 20, 2014 22:36:10 GMT -5
Ok I was able to check CX121, it splits into 2 separate connectors, one 4 pin and one 8 pin which both go to the Digital/HDMI board. The 5v reading on pins 1 and 3 read +5v. Pins 6 and 10 read 0.000vdc The 5v is fed from a different supply so this is good. The pins 6 and 10 though are fed from the supply we are having trouble with so this confirms we have a problem in the circuit I posted. |
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Post by jeremy on Nov 21, 2014 0:53:18 GMT -5
I checked CX031, it reads +17.88vdc . I couldn't check for DC since I couldn't find where to test off of (I cannot access the bottom of the CPU power board so I have no idea from the top where I can test off of) You should be testing for AC voltage on CX031, not DC. Of course you should not have gotten 18v DC either. Please reverify. I mean't AC, sorry about that, I did re-check with AC and yes, 17.88vac, my bad!  |
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Post by mastertech on Nov 21, 2014 9:42:51 GMT -5
Ok, good.
If you do not have access to test across any of those caps on the DC side of that rectifier then you will have to solder some flywires on and test. You only need to test 1 location to see if there is DC output from the rectifier.
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Post by jeremy on Nov 21, 2014 11:13:55 GMT -5
I'll go ahead and post back once I have the readings, shouldn't be too long  |
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Post by jeremy on Nov 21, 2014 19:25:07 GMT -5
Okay, I am wondering if I can test for the voltage between Positive pin of C822 and Negative Pin of C824? If so, I did check, and it read +23vdc.
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Post by mastertech on Nov 21, 2014 22:15:47 GMT -5
Yes, that would be fine. And it looks like you have voltage there.
So now why no 3.3v at CW027, CW028 and CX121? I see there is a trigger on each of the 3 regulators but 2 different triggers. Odd that they would both be not there but lets check them. Connector CW118 pin 1, see if you have any dc. Also CW122, pin 12. Use gnd where ever to try, maybe pin 2 of CW027 or CW028.
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Post by mastertech on Nov 21, 2014 22:22:08 GMT -5
You know. If you want to power this board up for testing with it out of the receiver, see if the wire from the main transformer that connects to CX031 on this board is long enough to reach if the board is laying on you bench. This is all you need connected to start testing. You would have to jump the main relay so the transformer comes on when you plug in the power so you have to be more careful this way. But it helps a lot in testing.
But do the last test I posted first, if you can. I would like to see if the trigger signal is there.
Oh, also check CW122, pin 8 for a trigger voltage.
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Post by jeremy on Nov 21, 2014 22:27:29 GMT -5
I will do those checks and post back to you on the readings. As for the power up of the board, I will probably look into that tomorrow morning  |
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Post by maclaren on Nov 18, 2015 8:46:49 GMT -5
Hi, Im in a similar situation as Jeremy with my denon 3808ci. I have no gui hdmi or composite and no hdmi inputs working. I can get sound from tuner and phono. No power on any of the 3V outputs on board 1U-3817. According to the circuit diagram posted here and in my service manual there are three circuits fed by the bridge rectifier creating 3V output. The 5V lines seem ok. There does appear to be ac in ~18V to the bridge rectifier and dc out of the rectifier ~20Vdc. I have not yet pulled the circuit board as it will take some time to disassemble.
I'm wondering if the PWB could be ok and it could just be a bad board (hdmi?) since there appears to be some trigger voltage/signal that should be applied on dpower and vpower applied to base of the three transistors labelled KA102S. I'll take a lookat this later. Doe anyone know what it should be?
Jeremy, did you solve this?
Can anyone suggest what I should test next?
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Post by mastertech on Nov 18, 2015 10:33:38 GMT -5
Do you get a menu on the receiver front display?
Do other audio inputs work besides tuner and phono?
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Post by maclaren on Nov 18, 2015 12:17:44 GMT -5
Thank you so much for replying so fast! yes, I get a menu on the front display just nothing on hdmi out or in. I will test the other analog inputs later as well as digital audio. I will also check the triggers per your rec to Jeremy last year and post the results. Im hoping its not the hdmi board which is hard to get replaced but something in the 3.3V power circuit to it that is fixable.
I would add too that I have not being able to update the firmware it shows sbeing stuck at 82mins - if interupted with up/down and poweing on shows an error (which from the service guides says
① Sub-μcom NG No response from Sub-μcom " □ ＳＵＢ □□ ＥＲＲＯＲ □０１□ " |
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Post by mastertech on Nov 19, 2015 12:24:28 GMT -5
Very odd that they would all have a problem so lets look there first. Can you recheck voltage at pin 1 of each regulator. make sure you use D GND (or pin 3)for neg probe.
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