Marantz NR1605 clicks on then goes right back off - Page 1
Forum section: electronics / repair

author: Stealthrt
author_rank: Regular Contributor
timestamp: August 15, 2020, 08:21:12 pm
content: Hi all.So I bought a Marantz NR1605 A/V off of eBay "as-is". The description reads:Marantz NR1605 AV Receiver As Is, no returns or guarantees Shipped with USPS Parcel Select Ground. This was a new receiver purchased in approximately early 2015. The receiver still turns on but I think during a power outage/surge something happened to the HDMI in/out capabilities. The receiver is included with the adapter, manual, and remote controlThey are correct - it does come on but only for a few milliseconds before turning off. I bought it thinking that it probably would just be a blown fuse or something I could see a burnt component on the board that I could replace.Opening it up I found a total of 4 fuses. Each fuse looked just fine. Nothing blown. Examining the board(s) inside they all seem clean and shinny/new looking. Nothing on the board(s) look burnt or leaking in any way.However, I am unable to figure out what the steps are in order to take each PCB board out in order to see what beneath it - if there are any more fuses or check for something burnt/leak.I have taken a good amount of pictures in order to let you see what I am seeing. Perhaps you would be able to spot something that I have not. Or better yet, let me know how to go about taking the PCB boards out. I also have 2 videos showing it coming on and then offhttps://www.dropbox.com/s/bh4r4f22kgtadfh/20200815_142100%20%281%29.mp4?dl=0and also what it looks like on the LED screenhttps://www.dropbox.com/s/yjb98avhwpsrfwz/20200815_141224%20%281%29.mp4?dl=0when it comes on.https://www.dropbox.com/sh/lixs7eis9shw7x8/AAD00CL3a2469GNL3XZILdrRa?dl=0​​​

author: Haenk
author_rank: Super Contributor
timestamp: August 15, 2020, 10:12:25 pm
content: (I'd say this is a hopeless case. This basically is a complex computer with additional complex electronic stuff. On bootup, plenty of checks are done in all parts of the receiver, if something fails, it shuts down. If the fault appeared in the HDMI section after some voltage spike - you are not going to fix that board, that one is "exchange only". *If* it's that board. After all a working second receiver to swap parts to narrow down the issue is IMHO the best way. Which makes it financially unattractive, but might be a fun educational project.)That said, the HDMI flex cable might not be full seated, and that front PCB seems oddly warped...

author: Stealthrt
author_rank: Regular Contributor
timestamp: August 15, 2020, 10:36:33 pm
content: Quote from: Stealthrt on August 15, 2020, 08:21:12 pmCan you circle the area that you feel is oddly warped?

author: glentek
author_rank: Regular Contributor
timestamp: August 16, 2020, 01:08:49 am
content: I had this problem with my Yamaha amp. The protection circuit kicks in if it detects dc on one of the outputs. It wans't the main channels, which are on the main board, but one of the effects channels which were mounted vertically off the main board. It was a dry joint. Not sure if it was the right angle header or a component on the board. It took a hell of a lot of dismantling to get to it. The way to find which amp is faulty is to temporarily disable the protection circuit and measure for any dc on the amplifier outputs - no load of course. You'll almost certainly need a schematic to trace the protection.https://www.service-manual.net/?download=57735-marantz-nr1605-service-manualhttp://servers.piernov.org/~piernov/Marantz%20NR1501/hfe_marantz_nr1501_service_en.pdfJust looking at the pdf above, although it's not he correct model, the protection circuit also monitors all the supply rails. Q201 to Q211

author: Haenk
author_rank: Super Contributor
timestamp: August 16, 2020, 06:23:58 am
content: Quote from: Stealthrt on August 15, 2020, 10:36:33 pmThe flex cable marked at the connector "F/HDMI" looks only semi-seated; check the PCB northwest of the large heatsink (where the beforementioned flex cable ends) - which after all gives to think, looks like someone already has been messing around with this receiver...