Denon AVR-1912 E2/EA

[Michael Studio1]

Later: You are RIGHT!! Thank you John for your amazing input! The AVR remains ON. I merely removed the 2 'TaggedTestTails' from CN1 pin1(FL) and CN1 pin2(FR) - Page 106/O3. These pins are in the same Cct. as the Test Points: TP401 and TP402 (page 106/I2) with a 10KΩ in-line resistor between pin3 of each TP and the FL and FR. My added tags must have upset things. Now I must reset the AVR according to Page 19. Michael Studio1 UK
11:40GMT

 

[Michael Studio1]

Of course - I saw those added TaggedTestTails were really quite unnecessary as they were replicated in the pins3 of TP401 and TP402 except for the added in-line 10KΩ resistors along-side them (Page106/I2) But now I have a totally new problem. The Display Panel at the Front is not coming on. Michael Studio1 UK 11:59GMT

 

[Tha fios agaibh]

Page 130. Any chance you've popped fuses F101 or F102?
Do you have +3.3 ON Pin 3?

 

[Michael Studio1]

Page 130. Any chance you've popped fuses F101 or F102?
Do you have +3.3 ON Pin 3?
View attachment 40037

Thanks, John, I wish I could tell you - but this MUST be a Monday since everything has reverted to form. RED flashing light around the 'ON' push-button. Why? Well, I have to confess I discovered just now that I hadn't put all the connections back in. The One Big Connection I left not connected was the BIG Yellow/Black to Xfmr Primary. Once I had got over my shame and confusion, realised it was indeed Monday and I'm not 'up-to-speed' and plugged that plug in its socket I am back to the dread flashing red light. Now what?? So I cannot read that SWM3.3V on the CX4 ribbon. Michael Studio1 UK 13:24GMT

 

[Tha fios agaibh]

Yes, Monday.
No shame needed. At least you are see the oversight.
If screen still out post plugging in all connections, Swm3.3 originates here on page 117.

What to do next? Well, (my best Brit accent) It's about tea time, isn't it?

 

[Michael Studio1]

Yes, Monday.
No shame needed. At least you are see the oversight.
If screen still out post plugging in all connections, Swm3.3 originates here on page 117.View attachment 40040

What to do next? Well, (my best Brit accent) It's about tea time, isn't it?

Hello John: Thanks for this! In the UK it is Always 'Tea-time'. YouTube: < Jacob Rees-Mogg > for the correct accent. So until I can 'power-up' this AVR I can make no readings - if I am wrong in this please advise. Please advise anyway!! Michael Studio1 UK 14:29GMTeatime

 

[Michael Studio1]

Hello John - I see F100 and F101, but I cannot find F102. Please advise! Michael Studio1 UK 15:04GMTea-time

 

[Michael Studio1]

After pressing the 'ON' button, there are about 5 seconds before the AVR reverts to flashing RED surround. In that window of 5 secs. I have monitored the Voltage at the CX4 ribbon pin3 SWM on the HDMI_B'D and it reads: +6.8V. Then, of course, drops to 0V. Michael Studio1 UK 15:15GMTea-time

 

[Tha fios agaibh]

I saw this on the web.
I think protect mode has to be reset.

 

[Michael Studio1]

I saw this on the web.
I think protect mode has to be reset.View attachment 40042

Thank you, John. This is a bit more informative than the instruction No.3 on Page19. I tried this several times. Interestingly the Display did come on - thus proving that, though I cannot find F102, the Display does work. The AVR, though, reverted to a flashing RED after. Meanwhile, during the brief period it was powered up, I took the opportunity to measure some Voltages:- CN14 pin15 = +3.8V. CP13A pin6 = -7.8V. CP13A pin7 = +8.17V. CN101 pin1 = +14.7V. Michael Studio1 UK 16:33GMTea-time - and it really is, this time!

 

[Tha fios agaibh]

The display does work, that's a big plus.
I would forget about F102 for now. I was just looking as to why the display may have lost power.

I'm forgetting the chronology of events.
At one point, the power came on and stayed on for a long time, correct? At what point did it start switching off after 5 seconds?
Something must have changed.

Are you getting any error codes on the display?

 

[Michael Studio1]

The display does work, that's a big plus.
I would forget about F102 for now. I was just looking as to why the display may have lost power.

I'm forgetting the chronology of events.
At one point, the power came on and stayed on for a long time, correct? At what point did it start switching off after 5 seconds?
Something must have changed.

Are you getting any error codes on the display?

I am getting nothing on Display. The AVR simply turns itself off after about 5 seconds. However - as I posted - if I'm speedy enough, that 5 secs is time enough to get some Voltages. So for each time it was 'ON' for 5 secs, I procured 1 Voltage. After about 5 attempts I got the Voltages as shown above. Yes, I agree, something must have changed. I was in the process (when the AVR was staying on) of making adjustments as shown on page 56. In preparation for this I had turned all 7 pots completely anti-clockwise as required in 2.(1) I went through the requirements of 2.(2), 2.(3) & 2.(4) and was adjusting the current at TP401 to 2.0mV. as required in 2.(5) when the AVR protested by turning itself OFF. That is the only thing to have 'changed' - simply following the procedure on page 56. So I am getting no error codes on the display, I am getting nothing. My interpretation of the procedure of 2. Adjustment could be wrong. At 2.(5) it is not at all clear whether all pots are to be adjusted one-after-the-other, and to go on through all 7 pots, or whether it is expected to wait 10 minutes and then just set VR401 to 3.0mV. before going on to do likewise on VR402 as measured at TP402 etc. What is your interpretation? Is it possible this is the cause? Michael Studio1 UK 18:43GMTea-time - and Tea is indeed 'ready' I have just been told!

 

[Michael Studio1]

Later: I am invoking page61 again: Trouble shooting. 'Power not turn on' "Is the Fuse blown?" NO > Check Voltage of CN8 (1 - 5pin) of HDMI B'D whilst 'ON' button is flashing GREEN = pin1(Yellow) = 3.67V. pin2 = 3.8V. pin3 = 0V. pin4 = 4.31V. pin5 = 5.0V. "Pull out connector (CP1) of SPK B'D. and check "2. Errors checking mode page 23. According to this AVR-1912E2/EA - Press 'ON' button whilst holding in 'STATUS' and 'SLEEP' buttons, (protection history mode is set) then press 'STATUS' again: Result (have to be quick doing this!) Page 23 (4) For THERMAL - briefly shows: PRT : THERMAL B - so how is this new information to be interpreted? But we're getting somewhere I think. Michael Studio1 UK 22:05GMTea-time - or rather, Bed-Time!Y

 

[Tha fios agaibh]

I was in the process (when the AVR was staying on) of making adjustments as shown on page 56. In preparation for this I had turned all 7 pots completely anti-clockwise as required ..

Ah, perhaps we should turn back the pots and see if we can recreate that scenario where it doesn't turn off?
I'll have to read up on that section, and try and find out where the pots are on the schematic (if I can carve out some time).

If you can figure out which pot is causing it to go into protect mode, that'd be a big clue to the puzzle.

Great progress Michael.

 

[Michael Studio1]

Ah, perhaps we should turn back the pots and see if we can recreate that scenario where it doesn't turn off?
I'll have to read up on that section, and try and find out where the pots are on the schematic (if I can carve out some time).

If you can figure out which pot is causing it to go into protect mode, that'd be a big clue to the puzzle.

Great progress Michael.

Good point, John. I shall turn all those pots back to '0'. As I recall I had got to approx. TP402/VR402. But that's just a guesstimate. The 'Thermal' issue, though, is a reality. I didn't get those VR pots up very far to achieve 2V. VR401 pot is Page106/G2. They all line up under Column 'F/G' (borderline) on both Page 106 and 107
Michael Studio1 UK 06:37GMT

 

[Michael Studio1]

I have turned all VR pots anti-clockwise and tried the 'Factory Reset' you found. The AVR still only stays on for about 5 secs though. So I go back to Page23 and re-check the Errors. With the short 5 Secs window still in force I Start > with STATUS and SLEEP buttons depressed and as soon as the FL flashes every second I release the STATUS and SLEEP buttons then press SLEEP again. I go through this Start-up sequence several times to ensure I get the same result. It is still Result (4) PRT : THERMAL B . Cause: The temperature of the heat-sink is excessive. Obviously this 'abnormality' needs correcting. Is this the long corrugated heat-sink to which the 7Channel Amp. is attached? What would cause this to happen? Michael Studio1 UK 08:14GMT

 

[bushtech]

Well, I am totally out of my depth here, but switch it on and start feeling the transistors on the heat sink to see which are getting very hot

 

[Tha fios agaibh]

Yes, I'm thinking one of those Darlington transistors may be shorted. Are there two heat sinks, one for left and right?

It is the left side that is out correct?

Any chance you can post some pictures?

 

[Tha fios agaibh]

Page 129 shows pin 5 Themal B from amp

 

[Tha fios agaibh]

Q451, or Q463 triggers the Thermal B.
I think Tr thermal is telling you a transistor is overheating. How many components are on that heat sink?
I predict some invasive surgery is warranted.