Question about Yamaha Audio Players & Recorders

Open Question

Yamaha RX-v420 wont turn on

I have a Yamaha RX-v420 surround reciever that will not turn on. I checked the voltage across the small trans former on the power board (which I assume is the standby power feed) and on the side with two terminals I could only read 0.5 volts accross them. Is this within spec? if not what should I check next? I have already checked the fuses.

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  • dude998866 Jun 22, 2009

    Between chassis and the two capacitors on the power board I measured 0 volts.

  • dude998866 Jun 25, 2009

    Ok so heres what I've done so far. Apon further testing the standby transformer is outting out 5 volts and seems to be fine. I have tried bypassing the realy on the power board, but this did nothing. I have also tried running power directly to the mains on the main transformer. This onky lit up all the lights on the front display, so ther was no input, just power going to it. So what should I check next?

  • dude998866 Sep 28, 2009

    The voltage across the largest capacitor is zero. The aluminum heat sink has 10 transistors mounted to it and there is no voltage at the center pin to any of them. I'll have a look for that fuse.
    Sorry for the long delay in responses, life got in the way.......
    Thanks

  • dude998866 Sep 28, 2009

    I have found a schematic for it if it helps.
    http://www.eserviceinfo.com/download.php...

    it is in two parts, must download both and un rar

  • dude998866 Sep 28, 2009

    I'm currently taking out the standby transformer because I think it might have had it as the schematic says it should put out a little over 12 volts. I'm going to hook up an external 12v power supply and see if it works.

  • dude998866 Sep 28, 2009

    I'm currently taking out the standby transformer because I think it might have had it as the schematic says it should put out a little over 12 volts. I'm going to hook up an external 12v power supply and see if it works.

  • dude998866 Sep 28, 2009

    There is no power at +b4 or -b4. I believe this is because no power is being sent to the main transformer. should i still look at 401 and 402

  • dude998866 Sep 28, 2009

    There is no power at +b4 or -b4. I believe this is because no power is being sent to the main transformer. should i still look at 401 and 402

  • dude998866 Sep 28, 2009

    There is no power at +b4 or -b4. I believe this is because no power is being sent to the main transformer. should i still look at 401 and 402

  • dude998866 Sep 28, 2009

    no power at the mains, but the windings check out fine. If you read one of my earlier comments you'll see that I've fed power directly to the main transformer and the front display lit up (all lights were on) but the rest of the unit did nothing, no relay clicks or the like.

  • dude998866 Sep 28, 2009

    No power at either BR or GY

  • dude998866 Sep 28, 2009

    No power at either BR or GY

  • dude998866 Sep 28, 2009

    No power at either BR or GY

  • dude998866 Sep 28, 2009

    no voltage at either

  • dude998866 Sep 28, 2009

    BR and GY? they are on the power relay board.

  • dude998866 Sep 28, 2009

    BR and GY? they are on the power relay board.

  • dude998866 Sep 28, 2009

    no voltage at q162 where you specified but i have voltage coming out of the standby transformer

  • dude998866 Sep 28, 2009

    i get .6v at both GY and BR

  • dude998866 Sep 28, 2009

    I don't actually have a component at q162, and i think i've tried jumping past that relay before. and yes i realize they are ac

  • dude998866 Sep 28, 2009

    ac at secondary side of main transformer now but unit still does not power on. i'm on 110v

  • dude998866 Sep 28, 2009

    ac at secondary side of main transformer now but unit still does not power on. i'm on 110v

  • dude998866 Sep 28, 2009

    ac at secondary side of main transformer now but unit still does not power on. i'm on 110v

  • dude998866 Sep 28, 2009

    ac at secondary side of main transformer now but unit still does not power on. i'm on 110v

  • dude998866 Sep 28, 2009

    so do i leave the jumper wires there or take them off, and what exactly am i testing now?

  • dude998866 Sep 28, 2009

    so do i leave the jumper wires there or take them off, and what exactly am i testing now?

  • dude998866 Sep 28, 2009

    so do i leave the jumper wires there or take them off, and what exactly am i testing now?

  • dude998866 Sep 28, 2009

    no output on either B4 and there is one pin on the secondary with no voltage

  • dude998866 Sep 28, 2009

    no output on either B4 and there is one pin on the secondary with no voltage

  • dude998866 Sep 28, 2009

    so you want me to retest everything we already tested? and yes there is 6 volts coming out of the standby

  • dude998866 Sep 28, 2009

    so you want me to retest everything we already tested? and yes there is 6 volts coming out of the standby

  • dude998866 Sep 28, 2009

    so you want me to retest everything we already tested? and yes there is 6 volts coming out of the standby

  • dude998866 Sep 28, 2009

    so you want me to retest everything we already tested? and yes there is 6 volts coming out of the standby

  • dude998866 Sep 28, 2009

    posts:
    6v
    5.7v
    25.9v
    17.3v
    0v
    17.3v
    26v
    post not connected to anything
    .6v
    1.1

    the last 2 posts after the one thats not connected feed the display, or so it would appear

  • dude998866 Sep 28, 2009

    posts:
    6v
    5.7v
    25.9v
    17.3v
    0v
    17.3v
    26v
    post not connected to anything
    .6v
    1.1

    the last 2 posts after the one thats not connected feed the display, or so it would appear

  • dude998866 Sep 28, 2009

    posts:
    6v
    5.7v
    25.9v
    17.3v
    0v
    17.3v
    26v
    post not connected to anything
    .6v
    1.1

    the last 2 posts after the one thats not connected feed the display, or so it would appear

  • dude998866 Sep 28, 2009

    posts:
    6v
    5.7v
    25.9v
    17.3v
    0v
    17.3v
    26v
    post not connected to anything
    .6v
    1.1

    the last 2 posts after the one thats not connected feed the display, or so it would appear

  • dude998866 Sep 28, 2009

    b4 has 36v dc at it. the 26 v was at the pin between the unconnected one and the one with 0v. Also now upon plugging it in the LCD all lights up for a couple seconds and then goes out

  • dude998866 Sep 28, 2009

    measured the posts in ac

  • dude998866 Sep 28, 2009

    measured the posts in ac

  • dude998866 Sep 28, 2009

    -B4 is -36v dc

  • dude998866 Sep 28, 2009

    -B4 is -36v dc

  • dude998866 Sep 28, 2009

    could you give me a point to test ie. a # like ic105 as I'm not really sure where the preamp is

  • dude998866 Sep 28, 2009

    could you give me a point to test ie. a # like ic105 as I'm not really sure where the preamp is

  • dude998866 Sep 28, 2009

    check which part of that diagram?

  • dude998866 Sep 28, 2009

    check which part of that diagram?

  • dude998866 Sep 28, 2009

    check which part of that diagram?

  • dude998866 Sep 28, 2009

    ic 105 was just an example

  • dude998866 Sep 28, 2009

    can't seem to locate the preamp

  • dude998866 Sep 28, 2009

    can't seem to locate the preamp

  • dude998866 Sep 28, 2009

    No relay clicks. It essentially seems lifeless

  • dude998866 Sep 28, 2009

    No relay clicks. It essentially seems lifeless

  • dude998866 Sep 28, 2009

    There is no IC 105. I was just giving an example of a part number so that you'd know what I was asking for.

  • dude998866 Sep 28, 2009

    There is no IC 105. I was just giving an example of a part number so that you'd know what I was asking for.

  • dude998866 Sep 28, 2009

    What do the amps look like on the board so I can find them?

  • dude998866 Sep 28, 2009

    What do the amps look like on the board so I can find them?

  • dude998866 Sep 28, 2009

    What do the amps look like on the board so I can find them?

  • dude998866 Sep 28, 2009

    found ic 732, which of the 8 pins should i be checking

  • dude998866 Sep 28, 2009

    ok have +12v and -12v at ic 732

  • dude998866 Sep 28, 2009

    ok have +12v and -12v at ic 732

  • dude998866 Sep 28, 2009

    ok have +12v and -12v at ic 732

  • dude998866 Sep 28, 2009

    ok have +12v and -12v at ic 732

  • dude998866 Sep 28, 2009

    ok have +12v and -12v at ic 732

  • dude998866 Sep 28, 2009

    ok have +12v and -12v at ic 732

  • dude998866 Sep 28, 2009

    q910 side of ic 903 has 15 volts at all 3 pins on other side there is 16v .6v and5.53v

  • dude998866 Sep 28, 2009

    q910 side of ic 903 has 15 volts at all 3 pins on other side there is 16v .6v and5.53v

  • dude998866 Sep 28, 2009

    are these still on the display board?

  • dude998866 Sep 28, 2009

    D910 gives me 6.6v

  • dude998866 Sep 28, 2009

    each A1695 has 0v at the right pin and -50 at the center

  • dude998866 Sep 28, 2009

    each A1695 has 0v at the right pin and -50 at the center

  • dude998866 Sep 28, 2009

    each c4468 has nothing on right pin and +51v on the center.
    Reset???

  • dude998866 Sep 28, 2009

    each c4468 has nothing on right pin and +51v on the center.
    Reset???

  • dude998866 Sep 28, 2009

    Thank you by the way for all your help, it is much appreciated. It's also rather impressive that you can do all this without seeing it.

  • dude998866 Sep 28, 2009

    Thank you by the way for all your help, it is much appreciated. It's also rather impressive that you can do all this without seeing it.

  • dude998866 Sep 28, 2009

    what about it not turning on?

  • dude998866 Sep 28, 2009

    what about it not turning on?

  • dude998866 Sep 28, 2009

    what about it not turning on?

  • dude998866 Sep 28, 2009

    what about it not turning on?

  • dude998866 Sep 28, 2009

    what about it not turning on?

  • dude998866 Sep 28, 2009

    speaker and player ready

  • dude998866 Sep 28, 2009

    speaker and player ready

  • dude998866 Sep 28, 2009

    speaker and player ready

  • dude998866 Sep 28, 2009

    speaker and player ready

  • dude998866 Sep 28, 2009

    speaker and player ready

  • dude998866 Sep 28, 2009

    where is c172

  • dude998866 Sep 28, 2009

    where is c172

  • dude998866 Sep 28, 2009

    where is c172

  • dude998866 Sep 28, 2009

    found c172, but having trouble locating r79 or r83

  • dude998866 Sep 28, 2009

    found c172, but having trouble locating r79 or r83

  • dude998866 Sep 28, 2009

    found c172, but having trouble locating r79 or r83

  • dude998866 Sep 28, 2009

    can't seem to find r 79 or 83. where are re located?

  • dude998866 Sep 28, 2009

    can't seem to find r 79 or 83. where are re located?

  • dude998866 Sep 28, 2009

    still can't seem to find them. anywhere else i could connect it?

  • dude998866 Sep 28, 2009

    still can't seem to find them. anywhere else i could connect it?

  • dude998866 Sep 28, 2009

    found r83

  • dude998866 Sep 28, 2009

    found r83

  • dude998866 Sep 28, 2009

    i get static but no sound

  • dude998866 Sep 28, 2009

    i get static but no sound

  • dude998866 Sep 28, 2009

    i get static but no sound

  • dude998866 Sep 28, 2009

    i get static but no sound

  • dude998866 Sep 28, 2009

    The output at r83?

  • dude998866 Sep 28, 2009

    The output at r83?

  • dude998866 Sep 28, 2009

    ahh right aux, now i have sound as well as hum

  • dude998866 Sep 28, 2009

    humm is gone

  • dude998866 Sep 28, 2009

    humm is gone

  • dude998866 Sep 28, 2009

    cool, it works..... now i'm excited, what do we do next

  • dude998866 Sep 28, 2009

    cool, it works..... now i'm excited, what do we do next

  • dude998866 Sep 28, 2009

    the hum disappeared sound is clear now

  • dude998866 Sep 28, 2009

    the hum disappeared sound is clear now

  • dude998866 Sep 28, 2009

    why are we bypassing the processor, i thought we had to reset it? and what does it mean to "inject the hanging output"?

  • dude998866 Sep 28, 2009

    why are we bypassing the processor, i thought we had to reset it? and what does it mean to "inject the hanging output"?

  • dude998866 Sep 28, 2009

    r 83

  • dude998866 Sep 28, 2009

    r 83

  • dude998866 Sep 28, 2009

    by inject you mean make contact with one of the balance knobs pins?

  • dude998866 Sep 28, 2009

    by inject you mean make contact with one of the balance knobs pins?

  • dude998866 Sep 28, 2009

    by inject you mean make contact with one of the balance knobs pins?

  • dude998866 Sep 28, 2009

    I can't see a way to make contact with the RCA plug from the player and the balance knob contacts... sorry. So how do I reset the unit?

  • dude998866 Sep 28, 2009

    I can't see a way to make contact with the RCA plug from the player and the balance knob contacts... sorry. So how do I reset the unit?

  • dude998866 Sep 28, 2009

    I can't see a way to make contact with the RCA plug from the player and the balance knob contacts... sorry. So how do I reset the unit?

  • dude998866 Sep 28, 2009

    I can't see a way to make contact with the RCA plug from the player and the balance knob contacts... sorry. So how do I reset the unit?

  • dude998866 Sep 28, 2009

    I can't see a way to make contact with the RCA plug from the player and the balance knob contacts... sorry. So how do I reset the unit?

  • dude998866 Sep 28, 2009

    no, i don't have a remote for it, but i do have a logitech harmony remote that is programed for it.

  • dude998866 Sep 28, 2009

    no, i don't have a remote for it, but i do have a logitech harmony remote that is programed for it.

  • dude998866 Sep 28, 2009

    i have the logitech, yes

  • dude998866 Sep 28, 2009

    i have the logitech, yes

  • dude998866 Sep 28, 2009

    none, it is blank

  • dude998866 Sep 28, 2009

    as in it's not working

  • dude998866 Sep 28, 2009

    as in it's not working

  • dude998866 Sep 28, 2009

    as in it's not working

  • dude998866 Sep 28, 2009

    logitech harmony 550

  • dude998866 Sep 28, 2009

    logitech harmony 550

  • dude998866 Sep 28, 2009

    yamaha receiver display is blank

  • dude998866 Sep 28, 2009

    yamaha receiver display is blank

  • dude998866 Sep 28, 2009

    not even background light

  • dude998866 Sep 28, 2009

    not even background light

  • dude998866 Sep 28, 2009

    not even background light

  • dude998866 Sep 28, 2009

    I'm good to try a couple more things before turning on for the night

  • dude998866 Sep 28, 2009

    I'm good to try a couple more things before turning on for the night

  • dude998866 Sep 28, 2009

    I'm good to try a couple more things before turning on for the night

  • dude998866 Sep 28, 2009

    I'm good to try a couple more things before turning on for the night

  • dude998866 Sep 28, 2009

    I'm good to try a couple more things before turning on for the night

  • dude998866 Sep 28, 2009

    are these on the display board?

  • dude998866 Sep 28, 2009

    are these on the display board?

  • dude998866 Sep 28, 2009

    are these on the display board?

  • dude998866 Sep 28, 2009

    are these on the display board?

  • dude998866 Sep 28, 2009

    I think I'm going to have to call it quits for the night. I can't seem to locate IC803...... I'll have a go again tomorrow... thanks again

  • dude998866 Sep 28, 2009

    I think I'm going to have to call it quits for the night. I can't seem to locate IC803...... I'll have a go again tomorrow... thanks again

  • dude998866 Sep 28, 2009

    I think I'm going to have to call it quits for the night. I can't seem to locate IC803...... I'll have a go again tomorrow... thanks again

  • dude998866 Sep 28, 2009

    I think the screen is fine as when it's been unplugged for a bit and I plug it back in the screen lights up completely, as in every light on it is lit up, so it's not displaying anything and then after a few seconds it goes out, So I'm assuming that it's not working because there is no signal from the processor?????

  • dude998866 Sep 28, 2009

    D803, D808 both have the correct voltage as does IC 804. Although on my board IC 804 does not have the center connected, only the 3.4V and the 4.5V outside pins.

  • dude998866 Sep 29, 2009

    D808 and D803 where good, should I check the others or should we move on to resetting it and if it still doesn't work try it from there?

  • dude998866 Sep 29, 2009

    I'm afraid that i can't make out the numbers on the last schematic you posted, could you tell me what they are or zoom in a bit please

  • dude998866 Sep 29, 2009

    I'm afraid that i can't make out the numbers on the last schematic you posted, could you tell me what they are or zoom in a bit please

  • dude998866 Sep 29, 2009

    I'm afraid that i can't make out the numbers on the last schematic you posted, could you tell me what they are or zoom in a bit please

  • dude998866 Sep 29, 2009

    D 904=2.7v
    D 902=05v

  • dude998866 Sep 29, 2009

    D 904=2.7v
    D 902=05v

  • dude998866 Sep 29, 2009

    U901 gets the correct voltage and varies when I use the remote

  • dude998866 Sep 29, 2009

    U901 gets the correct voltage and varies when I use the remote

  • dude998866 Sep 29, 2009

    which board? the display one? if so it doesn't go in chassis. it is screwed into front bezel

  • dude998866 Sep 29, 2009

    I have nothing at j 1005, just holes

  • dude998866 Sep 29, 2009

    I have nothing at j 1005, just holes

  • dude998866 Sep 29, 2009

    To put all boards back in I will have to disconnect our jumpers on the power relay board. should i leave that board loose?

  • dude998866 Sep 29, 2009

    To put all boards back in I will have to disconnect our jumpers on the power relay board. should i leave that board loose?

  • dude998866 Sep 29, 2009

    To put all boards back in I will have to disconnect our jumpers on the power relay board. should i leave that board loose?

  • dude998866 Sep 29, 2009

    To put all boards back in I will have to disconnect our jumpers on the power relay board. should i leave that board loose?

  • dude998866 Sep 29, 2009

    Which part would you like pic of?

  • dude998866 Sep 29, 2009

    dob of solder off of j1005 has 0v

  • dude998866 Sep 29, 2009

    dob of solder off of j1005 has 0v

  • dude998866 Sep 29, 2009

    dob of solder off of j1005 has 0v

  • dude998866 Sep 29, 2009

    dob of solder off of j1005 has 0v

  • dude998866 Sep 29, 2009

    digital multimeter, no continuity between ground and j1005

  • dude998866 Sep 29, 2009

    digital multimeter, no continuity between ground and j1005

  • dude998866 Sep 29, 2009

    the side of the jumper not connected to the chip has continuity to chassis

  • dude998866 Sep 29, 2009

    the side of the jumper not connected to the chip has continuity to chassis

  • dude998866 Sep 29, 2009

    the side of the jumper not connected to the chip has continuity to chassis

  • dude998866 Sep 29, 2009

    what point is pin 21 connected to that i can test at?

  • dude998866 Sep 29, 2009

    what point is pin 21 connected to that i can test at?

  • dude998866 Sep 29, 2009

    what point is pin 21 connected to that i can test at?

  • dude998866 Sep 29, 2009

    Q911=4.9v, -18.4v, 4.5v
    Q912=4.9v, -21.6v, 4.5v

  • dude998866 Sep 29, 2009

    Q911=4.9v, -18.4v, 4.5v
    Q912=4.9v, -21.6v, 4.5v

  • dude998866 Sep 29, 2009

    i have made all measurements with the negative on the chassis

  • dude998866 Sep 29, 2009

    i have made all measurements with the negative on the chassis

  • dude998866 Sep 29, 2009

    i have made all measurements with the negative on the chassis

  • dude998866 Sep 29, 2009

    i have made all measurements with the negative on the chassis

  • dude998866 Sep 29, 2009

    -29.1v @ r911 which is connected to pin 1 vfl

  • dude998866 Sep 29, 2009

    -29.1v @ r911 which is connected to pin 1 vfl

  • dude998866 Sep 29, 2009

    R999=-22.3v
    D909= -29.1 on one side and -22.3 on the other

  • dude998866 Sep 29, 2009

    R999=-22.3v
    D909= -29.1 on one side and -22.3 on the other

  • dude998866 Sep 29, 2009

    we tested that earlier, it had 0v

  • dude998866 Sep 29, 2009

    we tested that earlier, it had 0v

  • dude998866 Sep 29, 2009

    yes it's plugged in, and yes zero volts

  • dude998866 Sep 29, 2009

    remember though, it's not connected to anything as there is no j1005 on my board

  • dude998866 Sep 29, 2009

    remember though, it's not connected to anything as there is no j1005 on my board

  • dude998866 Sep 29, 2009

    pin 29 is not connected to anything. it goes to a hole where j1005 should be

  • dude998866 Sep 29, 2009

    pin 29 is not connected to anything. it goes to a hole where j1005 should be

  • dude998866 Sep 29, 2009

    with unit not plugged in i have continuity between pin 29 and chassis

  • dude998866 Sep 29, 2009

    with unit not plugged in i have continuity between pin 29 and chassis

  • dude998866 Sep 29, 2009

    3 pins on xl 901 i get 1.5v, 0v, 2v

  • dude998866 Sep 29, 2009

    3 pins on xl 901 i get 1.5v, 0v, 2v

  • dude998866 Sep 29, 2009

    is what shorted? I just gave you those pins via xl 901

  • dude998866 Sep 29, 2009

    is what shorted? I just gave you those pins via xl 901

  • dude998866 Sep 29, 2009

    c902 has 4.5v on one side, 0 on the other

  • dude998866 Sep 29, 2009

    c902 has 4.5v on one side, 0 on the other

  • dude998866 Sep 29, 2009

    c902 has 4.5v on one side, 0 on the other

  • dude998866 Sep 29, 2009

    i take it thats a bad thing

  • dude998866 Sep 29, 2009

    i take it thats a bad thing

  • dude998866 Sep 29, 2009

    i take it thats a bad thing

  • dude998866 Sep 29, 2009

    do you mean ic 902????????

  • dude998866 Sep 29, 2009

    nvm found ic903

  • dude998866 Sep 29, 2009

    Ic903= 15.8v, 0.7v, 5.5v

  • dude998866 Sep 29, 2009

    Ic903= 15.8v, 0.7v, 5.5v

  • dude998866 Sep 29, 2009

    Ic903= 15.8v, 0.7v, 5.5v

  • dude998866 Sep 29, 2009

    should i check the voltage at D908 and C908 then?

  • dude998866 Sep 29, 2009

    should i check the voltage at D908 and C908 then?

  • dude998866 Sep 29, 2009

    c908=4.9v on one side 0.0v on the other
    d908=5.5v n one side 4.9v on the other

  • dude998866 Sep 29, 2009

    c908=4.9v on one side 0.0v on the other
    d908=5.5v n one side 4.9v on the other

  • dude998866 Sep 29, 2009

    so my next step is to replace those 3 capacitors then?

  • dude998866 Sep 29, 2009

    is c908 a special type of capacitor? i've never seen one like it before

  • dude998866 Sep 29, 2009

    is c908 a special type of capacitor? i've never seen one like it before

  • dude998866 Sep 29, 2009

    is c908 a special type of capacitor? i've never seen one like it before

  • dude998866 Sep 29, 2009

    Oh I'm not too worried, I've replaced capacitor before. I have a couple 16v 1000 laying around, I might have to buy the 0.047f one though....is that the same as 470uf? .... I do have a couple parts boards laying around, and I beleave a couple old video cards

  • dude998866 Sep 29, 2009

    Oh I'm not too worried, I've replaced capacitor before. I have a couple 16v 1000 laying around, I might have to buy the 0.047f one though....is that the same as 470uf? .... I do have a couple parts boards laying around, and I beleave a couple old video cards

  • dude998866 Sep 29, 2009

    Oh I'm not too worried, I've replaced capacitor before. I have a couple 16v 1000 laying around, I might have to buy the 0.047f one though....is that the same as 470uf? .... I do have a couple parts boards laying around, and I beleave a couple old video cards

  • dude998866 Sep 29, 2009

    i'll see what i can dig up

  • dude998866 Sep 29, 2009

    i'll see what i can dig up

  • dude998866 Sep 29, 2009

    i'll see what i can dig up

  • dude998866 Sep 29, 2009

    will do, is that just to cover all bases?

  • dude998866 Sep 29, 2009

    i could use 4 470uf electrolytic capacitors?

  • dude998866 Sep 29, 2009

    i could use 4 470uf electrolytic capacitors?

  • dude998866 Sep 29, 2009

    i could use 4 470uf electrolytic capacitors?

  • dude998866 Sep 29, 2009

    replaced c907, 904, 905

  • dude998866 Sep 29, 2009

    any chance I might not need to do C908???

  • dude998866 Sep 29, 2009

    any chance I might not need to do C908???

  • dude998866 Sep 29, 2009

    any diode will work?

  • dude998866 Sep 29, 2009

    any diode will work?

  • dude998866 Sep 29, 2009

    so 2x1uf= 0.047F?

  • dude998866 Sep 29, 2009

    so 2x1uf= 0.047F?

  • dude998866 Sep 29, 2009

    so 2x1uf= 0.047F?

  • dude998866 Sep 29, 2009

    so 2x1uf= 0.047F?

  • dude998866 Sep 29, 2009

    replaced the diode, still getting 4.5v on c902 the sides of c908 and d 908 yjat are connected both get 4.9 v

  • dude998866 Jan 22, 2010

    Sorry for absence, life got busy.... either way.... What I meant was The positive of c908 has 4.9V but the negative has 0V. I replaced D908 with no change, and I also tried replacing C908 with 2 1uf capacitors in series still with no results.

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SOURCE: Yamaha RX-V420 No power

If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Dan

Posted on May 12, 2008

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1 Answer

When playing the DVD when you turn up the volume the amplifier turns off.


Amplifier and an over load issue and is shutting down to protect the circuits. Needs to be checked out by tech.

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Aug 05, 2009 | Yamaha RX-V420 Receiver

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How much for a digital board for my yamaha a/v rxv 420 ?.an expert check my a/v and tell me the problem is the digital board.


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Yamaha RX-V420 No power


If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Dan

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2 Answers

Yamaha RX-V420 Will Not Power up


Hi Daniel if your set does not have a fan that trips on when the volume gets louder surely the audio output will damage. every working component generates heat and when the heat sore up to an uncontrolable level it cause damage.have a tech look on your set to repair it.good luck.

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