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6 amp power board fuse blow when power button pressed.

As soon as I press the power button the 6amp fuse on the power board will blow. I have replaced it once and it keeps happening as soon as the power button is pressed. Any ideas how to figure out what to replace (other than the whole thing).

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  • Brian A Apr 29, 2013

    Thanks for the response. It is a denon AVR-800. I took a look inside and saw no visible signs of damage other than the fuse. Origionaly I thought the main trasformer may have gone bad as this fuse seems to be between the wall power cord and the leads to the transformer. There are two other fuses closer to the heat sink that are undamaged. To work on this I currently only have a good soldering iron. Could you tell me what tools I would need to properly test and replace what might be broken? I have read that all transistors in parallel with the shorted one must be replaced. Could you tell me what trasistors I should get and where is a good source? Thanks

  • Brian A Apr 29, 2013

    And if it helps only the headphones were plugged in when it blew the first time and nothing was plugged in the second. I believe I also had it set to headphone only the first time. With this setting nothing is output to the speakers.

  • Steve K Apr 30, 2013

    You would have to have a multimeter in order to check the transistors and see which ones are bad. You don't usually have to change all the transistors in a channel unless there are all smoked. Look at the small reisitors near the output transistors and see if any of them look burnt. This will give you a clue as to what channel is bad.

  • Brian A Apr 30, 2013

    I dug a little deeper into it and found something. On the top level of chips that are screwed into the heat sink there are two chips both with five pins. When I turned the circut board over I could see that both of them had some traces that looked schorched. I wish I could post a picture but I am pretty sure this is the problem area. Now can I just replace those chips? Does this schorching ruin the board? It looks like maybe some the the traced may have melted together. Are these five pin chips transistors (I guess I can look that one up)? Thanks

  • Brian A Apr 30, 2013

    The numbers on the chips are (SK 18752 3805) on one and (SK 18752 3611) on the other. I think I see solder or that brown burn mark touching two traces. Even without the short does this brown burn mark ruin the trace and therefore the whole board?

  • Steve K Apr 30, 2013

    are you sure the brown that you're seeing is not just leftover solder flux?

  • Brian A May 01, 2013

    Here is what I saw. I am pretty sure this is what fried. Is the boad ruined too?





  • Steve K May 03, 2013

    looks like excess solder flux. I doubt if that is the area of you problem

  • Brian A May 04, 2013

    OK, I looked a little further and found this. This crack is definitely not right. This left, center and right channel transistors seem to be in pairs. Would I need to replace the pair or just the cracked one? The pins are bent 90 degrees and soldered to the bottom of the board. Replacing will be tricky because if I don't get the bend exactly right the pins won't be positioned next to the board and also since it is on the board everything will have to come out to get at the bottom of the board. Is there a trick to replacing these?



  • Steve K May 06, 2013

    You always replace output transistor in pairs. You will also need to check for any open resistors in that channel. Sometimes you get lucky, and it's just the two outputs and the fuse.

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  • Audio Player... Master
  • 1,054 Answers

That is usually caused by shorted output transistors. What brand/model do you have?

Posted on Apr 29, 2013

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robotek
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SOURCE: unit wont turn on

.Hi jepenny

The board you are looking at is the standby cct and power switching PCB. It sounds like that is working, so you have probably lost power to the transformer primary or the transformer is open circuit. Check for blown fuses and replace with exact same type and rating.

Be sure to unplug at the wall before touching any internals!!

If you can find no blown fuses, the power transformer may have failed. Good luck, get back to me here is you need any more advice. Thanks for using "FixYa"

regards
Graeme

Posted on Feb 18, 2008

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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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SOURCE: JVC RX-318 keeps blowing fuses

could be several things, speaker wires touching,shorted output transistors, a shorted rectifier diode,bad filter caps in the power supply,those are the most common

Posted on Jan 06, 2009

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SOURCE: sony str-de845 Powers up, relay clicks, fuses BLOW!

This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.

Posted on Mar 19, 2009

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