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Denon DVD 3800BD Won't Turn On (1 Viewer)

Joe 090

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Hello, I've recently bought a Denon 3800BD Blue-Ray DVD player. It was sold as spares or repairs because it wouldn't stay on.

When the stand-by button is pressed the red light around the button turns green for a second and then changes back to red.

Sometimes the words 'Power on' appear on the display for a second as well when the stand-by button is pressed but the words disappear when the button turns back to green.

I've tried using the remote control to turn the player on but the same fault occurs.

The DVD player is trying to turn on but won't stay on. Could it be a fault with the stand-by button or the on-off button?

If you have experienced the same problem then I would be grateful for any help. Thank you.
 

dpippel

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Sounds like it's done. Have you tried unplugging the player from power for 5 minutes, then reconnecting and trying again?
 

Joe 090

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Hi Dpippel, thanks for the reply. Yes, I tried connecting and re-connecting to the mains but it didn't help.

The previous owner told me that they had it checked by a Denon specialist and they said that the problem was that the motor was drawing too much current. I don't think that this is the problem, I think it's something to do with the on/off or stand-by button.

It seems such a waste to write the machine off for something that could be as simple as a contact switch. Any help/info is most appreciated. Thank you.
 

David Norman

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I doubt it's a button issue. My old Denon 5800 receiver starting doing something similar after 18-19 years. It would come on, but no sound would come out and fairly quickly it would shut down. I really hated to give up on the Monster since it was likely one of the most versatile and expensive pieces of gear I'd ever bought, but reading various forums it sounded like a processor board or group of capacitor likely toasted itself and it would probably cost more to attempt to fix than buying something new (been down that road more than once) and the fix might well be temporary given it's age.

A bad fuse would be great, but that should be a dead item rather than something turning off after a short period. Bad power supply, popped caps, shorted circuit boards (bugs, lightning, power surges, sometimes just age).
 

Joe 090

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Hi David,

Thanks for taking the time to reply.

I understand what you are saying and you may well be correct but my DVD player will only turn on for a second.

If it stayed on for say 10 minutes and then switched off then that may well be caused by an electronic part that's got too hot or burnt out. My player doesn't even get a chance to warm up which is what is puzzling.

Thanks for your information David, your message is appreciated.
 

OwenRubin

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I would have to agree, this sounds like a power issue, which would easily point to a bad power supply, regulator, or blown out caps. If the button was stuck or making momentary contact on its own, it would turn itself on as well as off, and you are not seeing that behavior.

I would open it up and inspect all the capacitors. See the ones circled in yellow, and especially the one circled in red in the attached photo. If they are expanded or look like they are going to pop (or have popped) that is a bad sign. Caps going bad can cause all kinds of weird problems as they cause the power supply to act flakey. If they are bad, the service manual is here.
 

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David Norman

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Hi David,

Thanks for taking the time to reply.

I understand what you are saying and you may well be correct but my DVD player will only turn on for a second.

If it stayed on for say 10 minutes and then switched off then that may well be caused by an electronic part that's got too hot or burnt out. My player doesn't even get a chance to warm up which is what is puzzling.

Thanks for your information David, your message is appreciated.

The receiver would stay on for less than 4-10 seconds even with no inputs attached (sometimes only a couple seconds) even if it had been unplugged all night so it had no heat at all.

If the tech said the item was getting "too much current" that would tend to make think some regulator, circuit, capacitor isn't functioning and the overload is causing the self protective circuits to shut it off. A short or crack in the circuit board could allowing energy to flow where (or in a direction) that it's not supposed to go.

A bad cap or couple bad caps could do this and with some knowledge/skill could be replaced. I had a couple Gigabyte Motherboards from the bad batches several years ago which both ended up popping caps. One of them literally popped and luckily I was nearby and was able to shut everything down and cleaned some cap gunk off the inside of the other boards before any damage happened. The other item I thought was safe would start to boot up, but rarely would get beyond the Welcome screen and sometimes would shut down at the opening information screen
 

Joe 090

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I would have to agree, this sounds like a power issue, which would easily point to a bad power supply, regulator, or blown out caps. If the button was stuck or making momentary contact on its own, it would turn itself on as well as off, and you are not seeing that behavior.

I would open it up and inspect all the capacitors. See the ones circled in yellow, and especially the one circled in red in the attached photo. If they are expanded or look like they are going to pop (or have popped) that is a bad sign. Caps going bad can cause all kinds of weird problems as they cause the power supply to act flakey. If they are bad, the service manual is here.

Hi Owen, thank you for your information and photo of the caps in my DVD 3800BD.
I'm very grateful for the help you have given me. I will open the player and examine the components. Hopefully it's fairly easy fix! Your help is appreciated. Thanks again.
 

Joe 090

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The receiver would stay on for less than 4-10 seconds even with no inputs attached (sometimes only a couple seconds) even if it had been unplugged all night so it had no heat at all.

If the tech said the item was getting "too much current" that would tend to make think some regulator, circuit, capacitor isn't functioning and the overload is causing the self protective circuits to shut it off. A short or crack in the circuit board could allowing energy to flow where (or in a direction) that it's not supposed to go.

A bad cap or couple bad caps could do this and with some knowledge/skill could be replaced. I had a couple Gigabyte Motherboards from the bad batches several years ago which both ended up popping caps. One of them literally popped and luckily I was nearby and was able to shut everything down and cleaned some cap gunk off the inside of the other boards before any damage happened. The other item I thought was safe would start to boot up, but rarely would get beyond the Welcome screen and sometimes would shut down at the opening information screen

Hi David, thank you for your information about the caps in my DVD 3800BD.
I'm very grateful for the help you have given me. I will open the player and examine the components. Hopefully it's fairly easy fix! Your help is appreciated. Thanks again.
 

OwenRubin

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Hi Owen, thank you for your information and photo of the caps in my DVD 3800BD.
I'm very grateful for the help you have given me. I will open the player and examine the components. Hopefully it's fairly easy fix! Your help is appreciated. Thanks again.

Note the link to the service manual. I did not go all there way through it, but might be work looking at to see if they offer any suggestions. Good luck.
 

Joe 090

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Note the link to the service manual. I did not go all there way through it, but might be work looking at to see if they offer any suggestions. Good luck.

Hi Owen, OK I will check the service manual for info. Thanks again for the link to the manual. I will let you know how I get on. Cheers
 

JackNoKnock

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Hello Joe, I just solve it. I have the same Denon 3800BD since several years but I do not use it and today I liked to use it again and it doesn't start up as you described.

I just solved this issue without any dissassembly.

What I did:
1. I turned on (push in) the small power button ON/OFF
2. I push the bigger button Stanby with the LED, It lid up for a secound green and return to red. During this short moment I saw Power sign on the display for 0,5s.


NOW The solution:

3. I started pushing the STANDBY button very quickly several times (maybe 30 times or more, very fast (3 per second) and after 10-15 sec the system starts and the green light and Power is normal. I started to listen to my favorite Bluray again :)

If this will help you please let me know. I use this Denon only few times per year and always it is swithed off all the time.

Cheers and Merry Christmas!!!

Greetings from Poland!
 

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