Re: Faultfinding a Denon AVR-1910 in protection mode



Hi R_J

I don't even know what / where the "output" board is, note I am a complete noob to this. If it's one of these smaller boards connecting the power cable in and front panel power buttons together then I'm guessing it's the one shown here. Although I see no small 2-pin plugs. Maybe they are there but the line of sight is obscured, I'm getting to the stage to start taking stuff out so will soon know.

Cheers
Mark...

Re: Faultfinding a Denon AVR-1910 in protection mode

Ok, I've got the readouts, are the 7912 values looking suspect...?

After realising that the pinouts are not the same between a 7812 and 7912 (why would they do that ), I can see that on the INPUT pin on the 7912, it gets [B]negative[/B] 20 volts but only for a second or two after powering up the amp. Then my meter just reads "-1", and this is before it has powered down itself.

Now I'm only assuming this is wrong based on what happens on the two 7812 input pins. They show a permanent [B]positive[/B]...

Re: Faultfinding a Denon AVR-1910 in protection mode

Close up attached of that component above the voltage regs.

In fact on looking close up, aren't they burn marks I see on the chassis under the middle chip?

Will power her up and check with the probe tomorrow when I have good light, it's no good at night here in this room.

Cheers...

Re: Faultfinding a Denon AVR-1910 in protection mode



So I'm expecting +12v on the 7812, and -12v on the 7912, oh their respective output pins yes?...

Re: Faultfinding a Denon AVR-1910 in protection mode



Sorry budwich, can you point out exactly what "thing" you're referring to?...

Hi all

First off I've never opened a home theatre amplifier before, and what an appalling sight! Taking this thing apart I can see is going to be an absolute nightmare but I'm hoping to get help in diagnosing the fault nonetheless!

So I've had my Denon AVR-1910 for about 4 years, hooked up to my PC via toslink cable and connected to two large front speakers, and two surround speakers. No problems up until now when a few nights ago I switched it on and after about 10 seconds started hearing buzzing / interference from the speakers. Then a few seconds later the amp switched...

Re: New Members - please post your introductions here

Hi All

Just registered on this forum as I have been reading around and the community / advice I've seen given looks awesome!

I'm a 40 something male from England who has limited electronic fault testing knowledge, and I'm here to try and diagnose my Denon AVR-1910 amplifier which is currently going into circuit protection with the flashing red power led.

I am however good with pulling things apart and soldering / desoldering components from circuit boards, as well as firmware / BIOS flashing...