Part 2 Onkyo TX-NR636 Intermittently shuts off. Corrosion? Customer repair? It's fixed

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A nice Onkyo TX-NR636 came in and the customer says it shuts off intermittently. Let me tell you, it had some carnage on the driver board. Luckily I found an almost identical model at a thrift shop to harvest parts from. All but 2 transistors on the driver board were bad. I replaced 9-transistors, 3-surface mount resistors, 8 fusible resistors, and 1-shorted capacitor. I did get the tuner operational also. I accidently shorted my test probes out and blew up the surround channel which I rebuilt off camera, but all is well again.
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00:00 The donor receiver and its problem
01:46 Schematic differences
03:16 The driver board repaired
04:10 All of the parts replaced
04:28 Testing DC offset and bias
06:13 Testing bias regulation
08:46 Testing audio output from the blown channel
09:42 The tuner does not work
10:15 The tuner still does not work/aux in audio tests
11:05 All of the parts replaced
13:51 Bonus footage - The tuner is working/my screwup

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Опубликовано:

5 июл 2024

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Комментарии : 18

@danielpeter4334 Месяц назад

Very good job. Keep on going!!!👍May I ask what is that brush you are using in cleaning the oxidization on jumpers?

@giorgostexnikos6976 2 года назад

amazing job

@MrReeceyburger123 2 года назад

Thanks Norcal again really love the in-depth diagnostic and inner engineering skill you have. I’ve got a Yamaha DSP735 in causing me massive problems, intermittent power issues only for the customer though 😭 I could not find a fault with the unit when it was first sent too me, tested it for a week or so I quoted for a full recap, I recapped it set the bias up and all working great. Customer has the unit for a day and it’s back to clicking on and off, unit sent back and I’ve had it two weeks now and still cannot replicate the fault. Solder joints on the amp boards are fine along with the PSU and protection pcb. The unit doesn’t react to vibrations or cold/warm temperatures, will play music loud all day and power cycle with out fault. I’m really stumped on what todo 🤔

@norcal715 2 года назад

Check the customers speakers for shorts, even the midrange and tweeters. Also I have had a WIFI router too close to the unit cause strange issues. Have the customer power it up without anything connected and see if it still shuts down, even in a different room also.

@RoughJustice2k18 2 года назад

Lucky you were able to source a donor unit to fix this one as many blown-up parts would be unobtainable new. Certainly a challenge but hopefully a happy customer.

@mixinginthebox 2 года назад

Nice ty..

@habsrepariert 2 года назад

Very impressive repair - thank you for sharing this. I assume that all transistors prior the bias stage probably had been blown due to the misterious liquid impact that you have determined in your first video part. From what I have seen on my Onkyo repairs, these transistors survive if a power transistor got shorted - which is the usual case if this amp turns into protect mode . But if I understand you right the power transistors had been changed before, correct? Did you got any feedback from your customer what exactly happend to this unit? And ...since not everyone have so much luck in having a spare unit for parts, may I ask over here if someone watching this already made some good experience in finding compatible transistor types to replace f.e. these INC and INA6006?

@NY411Info 2 года назад

Yep, It is easy to slip while testing and popping other components. Especially with the newer electronics.

@VSSDolbyATMOSAudios 2 года назад

❤

@kennynvake4hve584 2 года назад

I found another Tx-NR636 at an auction site..and it's not ebay if interested...auction ends in 5 days.

@tutankhamun505 2 года назад

Sony made in japan hr29m91 model TV was working, it didn't have a problem, then I tried to turn it on, when it opens, 10 red lights flash, it gives an error and turns off, what do you think?

@DhakaMusicOmar 10 месяцев назад

i have an Onkyo TX RZ730 that turns on & goes to diag mode then freezes, nothing works, not even the buttons, volume. can't even reset it. what should i do

@DrAVRECEIVER 2 года назад

Hello bro I'm from India,,,I have trouble with my pioneer Vsx1021 in that when power button press it goes immediately off and {ipod/usb} light blinking ,,, what can I do for this