Onkyo TX-SR605 'Stuck in Standby' Diagnose and Fix.

are those no meet you again and today we will govern a look at this uncle Tex - SR 6:05 amplifier and what this thing is doing it's absolutely nothing you press the power by a standby that goes off and then comes back on so we've got to figure out what's going on with it know in these my voice and you can see the mains power coming in there on the black lead and those that they're all transformed by there there's a little power supply so if it's on all the time and then it will send a signal to turn on the big transformer when you pressed power by so see this black wire here this is going to the main board now this is supplying 12 volts from that little path dolly over here and around to the CPU I'm pointing where you can't see of course over there and then when you press the power button a signal will be sent back to tell out relay to activate to turn on the main transformer so we need to figure out why that's not turning on so first of all we need to measure the voltage at this blue and white connector here that's the mains power going to the big transformer just see if that it's getting any power and if not a need to work out why now we're not hearing the relay click when the power button is pressed so we're assuming there's no power getting to that and so there will be a problem with the power on signal coming up this black lead so that's a look at it okay so this is a bit poor fella but you can see the flute meet her there looked into the thing now no obviously you have to be very careful playing around with this because this is all 240 volts live mains so make sure it's unplugged when you're sticking your probes and their stuff so we just seen our press the power button and there's no power get into that main transformer so now we need to work out why it is this schematic of the power supply board here is the power transformer the big one and so we look back to where it's powered and here is the little relay and the relay is powered from 12 volts and power D so follow this back up to the connector which is I would just power D there so and the black don't means that ground it so when when power D is grounded that gives 12 volts and ground to the relay and switches relay on so now we need to check the voltage at power D to see if we got any power so what we do first is we check 12 volts and ground except we've got 12 volts and then we'll check between 12 volts and power D and when we press the power switch we should get 12 volts on the meter because actually ground power D so it should be said that the secondary of this transformer is that 125 volts outside amps and that can give you a nasty sting believe me so you want to be very very careful turn around about we are okay at the minute because that's not activating so that's okay we do have to be a bit careful so when we need to probe now is the 12 volts just a second yeah no easy with these big probes I have ordered some smaller probes so we should be getting 12 volts level Wow 13.5 that's fine so no need to be proving the power D and just Lao and we should get 12 volts when the power is pressed that's really won't get nothing okay so we know now that the fault is not on this power forward the fault is somewhere back on this name board so now we have to track that further and see what's going on know what it will be there'll be the processor board over here we'll send out a signal which you'll probably activate transistor somewhere to give that the power so let me go and check the schematic I'll insert it in the edit if I can think about it and then we'll see what needs to be done okay guys so does the connection block that comes up here yeah it's a connection called a power that comes from the CPU board there is a resistor and it comes directly from the CPU through a resistor and then it comes up here to a power okay so for proving from a power to ground first a power switch we should see a voltage yes you see that man spiked top 4.2 okay yep so when we're pressing the power switch we are getting a voltage at a power so the CPU is telling it to turn on so now we need to locate the transistor paper going double O 2 so now we have to find transistor Q knowing double O 2 joined up with one knowing double-o to water bugga let me just show you this a minute okay so right down in there that is Q 9 mm - and so one leg about comes from the a power one leg that goes to ground and delvar leg goes to the power D over there so we have to know check that while it was no easy way to achieve only getting electrons history so I'm just gonna have to yeah just enough to trust me that I'm telling you I'm doing it's correct so we're going to base oh trying to start so we should be getting the a power to go off about five votes for point whatever it said yep see you there with it in the four point four votes so that's good so now we need to check continuity the collector the twenty star remember I'd use the meter mm-hmm so I go from the ground over here to grant down right down yeah that's fine and so we should have continuity to grind on the initial pin oh so we should go flip up on duty when this power switch is pressed although I'm expecting one because this emitter ping goes directly to power D so it's probably this transistor is blown so let's see if we get a flip for continuity when the power switch is pressed yes we do okay so that's odd so we should know check for continuity between the emitter pin and the power D pin and we're getting nothing how about that and there is nothing in between the emitter pin and that power depend so there must be a Fault in the track some work in there and now so what else do you know is temporarily solder a wire now and see if it works oh yeah this is the war I've now soldered onto that in metal pen of that transistor so now let it do is so dope her but I thought before before we actually soldered on it may be that this tracks burned home because there might be a problem with the relay so if we unplug this wire this well what I'll do is I'll just use my little voltage reference to and can it turn a couple of these pins and just see if we can hear to read a cooking just confirm there's nothing wrong with the relay so let me stick you back in the tripod and I'll just do that alright so little voltage reference now the good thing about this is it puts out I'll only put up 10 volts mu you need 12 to activate this relay but it puts out very very low current and so if there is any problem with the relay would read a circuit on this main board and now it won't clip but we're hoping we hear a really a click so it's the see second pin and the last pin and let's see if we can hear really thick yeah like certainly hear that so that's it so wouldn't you know it so do this black wire will help I think it won't quite long enough then on to the power D there's a power D test point there at EP 401 so if we sum that direct to that that will save us haven't interfere with this connector so let me shoulder this wire to the test point 401 and like this back in of course and then see if the thing works and if it does that will be one of the most simple fixes I've ever done on a stereo okay so that's why they're looking a bit messy because I haven't cleaned the flux off or anything yet but that's got that why no connector from the power D point they're going all the way over and down to this transistor here and so now we shall plug in this boiler again come here little while okay well it's hard to do this looking through the camera lens so damn it okay guys so there is a pudding all back in now I've still got the HDMI ball down the tutor board out but this thing in theory now should power up so let's find out if it does well of course it doesn't cause it isn't plugged in haha what hang on oh right II know it's plugged in now we've got the orange or red brother standby light so let's see if it comes on now yes it does look at that CD 36 yeah let's turn the volume down to know that this was nothing looked into it do you know okay well there are cows that's one of the simplest fixes although ever done on a stereo

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Views: 63,791

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Keywords: onkyo, tx, sr, sr605, tx-sr605, 605, fix, stuck, standby, repair, diagnose, fault, won't, power on, turn on, power up, cant, red, light, error, code, how to

Id: mftf0_QXcZ8

Length: 15min 50sec (950 seconds)

Published: Tue May 29 2018