How to fix blown pico fuse in DEH-7300BT

[3tasker1]

Hi, I've got a pioneer DEH-7300BT head unit and I was getting very loud noise through my speakers. After much searching I figured it was due to the common pico fuse problem. I did a lot of googleing with no success on a tutorial for my exact model. I also spent a while trying to find the pico fuse. So I figured I'd just give it a go and see how it goes.

At the same time I figured I'd document it to help anyone else who also has this problem. This is really a last option and will not solve any other noise problems. I figured it was this as it has happened before and I had it repaired under warranty. Said warranty has since expired :/

I would like to say, I'm not in any way trained, I've only used a soldering iron a handful of times (please excuse my soldering) and Just had to give it a go because I'm skint and cant afford to pay someone to do it. Thank god I tried it.

So here Goes.

1) The head unit has 4 screws on the top, don't bother undoing these like I did. It releases the CD tray from the top which you don't need to do. It will just be put back on. There are however screws on the back of the head unit which DO need to be removed. The Heat sink also has screws underneath. Which also need to be removed.

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2) You need to remove the front plastic bit. I've no idea what it's called, it's behind the face plate bit. It's really easy, it just un-clips on the top and the sides.

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3) The top metal casing slides off in the direction away from the plugs in the back. This is made easy if you gently squeeze the bottom of the sides inwards then slide it. BUT be careful, there is a delicate ribbon cable connecting the CD tray to the main board. Gently lift up the metal casing and CD tray and then detach the ribbon cable before removing the assembly completely. The ribbon cable has no clips etc, just gently ease it out.

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4) Now you need to locate the pico fuse. On this model its on the upper left. It is just above the warning triangle. It is labelled P251. It has a P on what looks like a sticker on top of it.

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5) You need to remove this fuse. The best way to do it is heating up the solder on each side and pulling it off gently. I couldn't do this, so I melted it down as much as I could and simply put a line of solder over it. Be careful, use as little solder as possible. If you can remove it, you still put a line of solder between the points. My first attempt didn't work as I had used too much and I think I caused a short. Not too sure but I got it to work in the end after taking off some solder and re shaping it a bit.

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6) Once you've done it, put it all back together and voila. Your pico fuse related noise issues should be sorted.

As long as you take your time, and keep calm if anything goes wrong, it'll be okay. As I said mine didn't work and even worse, I had no output at all. But I kept calm and sorted it out in the end.

Hope this helps some of you as It really would of saved me some time.

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[NIHL8ION]

I usually just ground the RCAs whenever I come across this issue, taking apart the hu can sometimes prove to be rather tedious work... Glad to see you got yours fixed though //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[3tasker1]

Hi, I read about doing that but I also read that it will only dampen the noise issues. So I thought I should really do it properly.

Also, I was pleasantly surprised about how easy it was to take apart and re assemble.

 

[NIHL8ION]

Hi, I read about doing that but I also read that it will only dampen the noise issues. So I thought I should really do it properly.
Also, I was pleasantly surprised about how easy it was to take apart and re assemble.

Most cases - YES they aren't bad, But I've come across a few here & there for other various repairs where face screws are seized up and won't come out no matter what, which leads to other fun (Insert sarcasm) and time consuming methods of attack which in my case leads to aggravation because my time is money //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[nepdaboss]

I have premier deh-p780mp with rca jacks on a pigtail harness and I'm having this pico fuse problem. I was wondering if I could splice into to pigtail wire and ground from there?