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Nedd to identify blown resistor

R-531 on main amplifier board of the AVR-3600dts model

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How can you detect a blown resister

Posted on Sep 08, 2008

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Harman kardon avr 7200 after turning on power it shuts it self down.


You more than likely have a blown channel. Use the diode checker on a DVM and chack each amplifier output for a short untill you find the bad channel. Once you have found it, you will need to replace both outputs and all of the trasistors in that circuit. You will also need to check your low ohm resistors and your emmiter resistor as well.

May 10, 2012 | Audio Players & Recorders

1 Answer

R47 resistor is blown on Neff S5453X0GB/07 control board. I can't make out the value as it is badly damaged - anyone know the correct value so that I can replace it (TY7 is blown as well!).


HI.We cannot really but identify the correct resistor value unless we can identify or determine the color coding on the resistor.Each color has a corresponding value and tolerance as well.If you can't indentify the color coding then you can refer to its diagram usually printed out on the side of the control board or near thecontrol board.We cannot but cannot give a guess value unless color coding is given.Thank you for choosing FIXYA.

Aug 27, 2011 | Dishwashers

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My harmon kardon avr 240 7.1 receiver has been working perfectly until I used it at a high db (around 9). Afterward the front main speakers stopped working. I hooked up 3 other pairs of speakers to make...


Without a schematic, you can take it apart and look around, and check any fuses you find. Sometimes, fuses are used in the form of "fusible links", which are very low ohm resistors in the input circuits to amplifiers, or in the power feeds to them. They're hard to identify without a schematic since they look like a small, metal film resistor, but they're usually about 1 ohm. If you're good at the resistor color coding, you can read and measure any you suspect as being one, and possibly locate it.
Otherwise, sometimes the main transistors in that amplifier circuit can go bad, or some other discrete component. In that case, you have to get a schematic and oscilloscope to figure it out.
Find your output to the front main speakers, and try to identify the part of the circuit that leads to it, to help narrow your search.
If this doesn't work, it will, unfortunately, have to be serviced. Check with a local tv repair shop, or contact Harman Kardon Support:
Hopefully, you will find a bad fuse or link.
Good luck, and hope this helps

Jan 21, 2011 | Harman Kardon AVR 240 Receiver

1 Answer

I had 2 speakers hooked up on ny avr 340. While listening to the radio i turned up the volume sightly and it went into protection mode. speaker wires were ok. Is this a simple fix?


That is not good I have to say :/

Check for transistors that read 0 or look like they got cooked,check the main fuse and if the fuse is blown,there's a reason so dont replace the fuse and turn it on just to blow another one. I would also check the audio amplifiers,usually they are STK's and are epensive (around 70-80$ a piece) and could take a while being they are manufacturer backordered. I would highly discourage using any import amplifiers as they are very low quality and fail within the first month or so.

Should it be lightning damage look around where the power cord plugs in,there may be 2 or 4 rectangular resistors that are open, (reads infinite in a resistance scale) those are easy replacements. Diodes are also a common factor,any that read 0 are usually bad unless they are close to a coil or transformer.

Jul 07, 2009 | Harman Kardon AVR 340 Receiver

1 Answer

Wireing schematic


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I have a Mitsubishi Big Screen TV Model BS5006R .it mix the tree light (green,blue and read ) because of this it has poor pictur qualuty and some times it is difficalt to identify some picture .

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Aug 04, 2008 | Televison & Video

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Need to identify blown resister r-531 on main amplifier board


How do you know it is specifically that resistor? I suppose you have schematics or something that is telling you R531 may be an issue. If a resistor is blown it will likely be black or discolored somehow.

Jul 11, 2008 | Denon Audio Players & Recorders

1 Answer

Blown Channel on an amplifier


Look for low valued resistors that may look ok, but be open. Check the emitter resistors (.22 or .47 ohms). Check the transistors in the driver circuit as well.
Dan

Jun 06, 2008 | Denon AVR 3808Ci Receiver

4 Answers

No speaker outputs


I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Nov 08, 2007 | Harman Kardon AVR 130 Receiver

1 Answer

On power up.......protect light comes on


what are the resistors connected to? mosfets?if so you need to identify which pin gate or source,these amps have dual so the other side would be the same.

May 04, 2007 | Boss IQ 1080.2 Car Audio Amplifier

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