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djcmx49
old techie !!
Last Activity: 09-09-2023, 08:47 PM
Joined: 01-11-2012
Location: ON, Canada
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  • djcmx49
    replied to JVC RX8010 A/V Receiver with no sound
    in Troubleshooting Audio Equipment
    Re: JVC RX8010 A/V Receiver with no sound

    Update : Unit repaired !!! I finally received parts and installed them on the weekend. As I originally suspected the alum. caps on Digital Proc. Board. There were over 2 dozen on the board but I concentrated on the filter caps rather than signal coupling. After installing and powering up the receiver I now have audio restored immediately, no delay or warm up or speaker switching on/off required... Thanks for all the help
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  • djcmx49
    replied to JVC RX8010 A/V Receiver with no sound
    in Troubleshooting Audio Equipment
    Re: JVC RX8010 A/V Receiver with no sound

    Thanks for ideas...

    Digital PCB receives +5,+13,-13. It has on board 3.3v reg. All voltages stay the same when not working or working...Can't tell if ripple is an issue without scope but no visible damage to any PS filter caps...

    Amp uses Large metal transformer for main PS. When I first looked at unit it had cold solder areas and heat damage in power supply circuit which I repaired thinking this should solve issue, upon putting back together I found I was sadly mistaken...lol But I agree it still may be PS...
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    Last edited by djcmx49; 01-30-2013, 08:40 PM.

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  • djcmx49
    started a topic JVC RX8010 A/V Receiver with no sound
    in Troubleshooting Audio Equipment

    JVC RX8010 A/V Receiver with no sound

    OK I have a JVC RX8010 receiver which has an intermittent no sound fault. When I turn on receiver for first time of the day I will have no sound any function. However if I select "line direct" I will get sound on front 2 channels. This feature bypasses Digital Proc. PCB. So you can guess where I am concentrating my troubleshooting, Digital Proc.board of course. However it's location makes it very difficult to take any voltages or scope it. Note, I don't have a scope.

    All power supply voltages are correct, I have service manual, all 5 audio O/P amps are working fine, I...
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  • djcmx49
    replied to Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources
    Re: Sanyo DP 42848 , no picture, sound OK

    OK so I went back at it and decided to go back to my original findings where I would put meter leads to conn. on master inverter to the ccfl. When doing this the backlamp stayed on for 10 or so seconds. I of course looked at connections carefully but they were not loose nor corroded. I decided to solder them directly to pcb as they went to another plug into panel assy' so I could still remove inverter pcb if need to...The backlamp works !!!! stays on fine... I would have never guessed it was that simple of a solution. The lamp/inverter still...
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  • djcmx49
    replied to Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources
    Re: Sanyo DP 42848 , no picture, sound OK

    Transformers all measure the same, only measurements I can get are 24.4 ohms between two contacts and other is 2.4 meg.ohm. that seems high but as I say all 4 same...?? I cannot make heads or tails on how it is actually wound regarding pin layout?
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  • djcmx49
    replied to Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources
    Re: Sanyo DP 42848 , no picture, sound OK

    Here are some pics...



    By [URL=http://profile.*************/user/djcmx49]djcmx49[/URL] at 2012-01-17


    By [URL=http://profile.*************/user/djcmx49]djcmx49[/URL] at 2012-01-17


    By [URL=http://profile.*************/user/djcmx49]djcmx49[/URL] at 2012-01-17


    By [URL=http://profile.*************/user/djcmx49]djcmx49[/URL] at 2012-01-17Re: Sanyo DP 42848 , no picture, sound OK

    Here are some pics...



    By [URL=http://profile.*************/user/djcmx49]djcmx49[/URL]
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    Last edited by djcmx49; 01-17-2012, 08:27 PM. Reason: picture size

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  • djcmx49
    replied to Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources
    Re: Sanyo DP 42848 , no picture, sound OK

    Schematic downloaded fine. However it does not have Power Supply or Inverter Boards. It seems they consider them non-serviceable...crap !

    I now think BackLamp is at fault here. Makes quite the Buzz noise for the two seconds it's on...still must rule out control circuit though...
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  • djcmx49
    replied to Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources
    Re: Sanyo DP 42848 , no picture, sound OK

    Thanks Jim... Awesome.!
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  • djcmx49
    replied to Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources
    Re: Sanyo DP 42848 , no picture, sound OK

    Thanks for the help guys I appreciate it ! I will check all caps in inverter boards again and windings... If I can't find anything I will post up pictures...A schematic would really help. Th e shop I used to work for didn't sell Sanyo so I don't think they are an option. Getting my hands on a service manual would be nice. I have a feeling it's a sense circuit fault?? But it could be too much drain on inverters from ccfl too. I assume the sense circuit detects current drain from ccfl's ? I don't have spare ccfl to troubleshoot with...Thanks...
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  • djcmx49
    started a topic Sanyo DP 42848 , no picture, sound OK
    in Troubleshooting TVs and Video Sources

    Sanyo DP 42848 , no picture, sound OK

    Hello all, My name is Don. I have been a bench A/V repair tech. for over 25yrs. but have been out of it for past 5yrs or so. I have a co-workers 42 LCD sanyo tv which has no picture but sound is OK.

    When you first turn on tv the backlight comes on for a second then goes out. The green power lamp stays on constant. Sound stays up fine. All power supply voltages are good. +24,+12,+5, and stay up. All caps on PS. board and both inverter boards look fine...

    Now here's the strange thing when I look at H/V connector out to CFL backlamp on master inverter board, left one...
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