Electronics Help PLS!!!!

[Malicia]

I need to know what this is, It blew when I was installing my Inlaws CD player and didn't check the fuse (which was too big)



Is was the same as the one just to the right. This is the only damage I can see so would replacing this item fix the cd player?

[Toobs]

could be anything... the one on the right looks like a cap but the smoked guy could have been a cap, diode, choke, resistor.
Under what circumstances did it blow up?
If you accidentally reversed +ve and -ve then it's probably a protection diode... it does kind of look like it was connected between B/UP and G which I assume is battery and ground.
If this is the case you should be able to just remove that from the PCB and play on... obviously you will no longer have any reverse polarity protection though.

[wilbo666]

Looks Like a Diode to me, the other one is marked as D718...

I think toobs is right and it is prbly for reverser polarity protection. If you remove it, it should work (if something else isn't broken!).

Cheers
Wilbo

[river]

Hi,

Looks like a diode. The good one on the right is labelled D-something and usually the D stands for Diode. If the blown one is labelled D-something then I'd make a pretty sure guess it's a diode. The yellow thing above the blown component is C-soemthing and C denoted Capacitor. Also, I assume the blow component is soldered onto the board at each end - that is, it has only two (not three) conenctions to the curcuit board. If it was a transistor then it would have three (or more - depending upon the trannie).

Assuming the blown device is identical to the one on the right, what is written on the good component? The writing will tell you what sort of diode it is. Armed with this info you can get another one. This is assuming the blown one is identical - that is, the devices look the same but may have different ratings.

Although this is a surface mount device you could, if you're careful solder in a standard diode - but again you need to know what diode to use.

So, the questions are... what is written on the good device (assuming it is the same as the blown device)? How did you do this damage to the unit?

It is possible that there may be more damage done other than blowing the diode. So, if the diode is replaced with the correct type/rating, it still may not work.

seeyuzz
river

[Malicia]

The Blown item is the same as D718 both marked 14/15 the writing above the blown item is D719 so I'll pop down to dicksmiths and grab one, Thanks for your help

[merc-blue]

OK it doesnt work like that,
deffently a diode, what diode? you have very little hope of finding out
D718 and D719 are just codes for the assemblers to bulid them eg, they will have a list which will say D718 = SM5819A (or the actual diode)
they both may not be the same diode, but its a good start
best bet is get in contact with the manufacter and try to get the diode specs and the number,
odds are DSE or similar wont stock them so a replacement your best bet will be digikey or RS both should have something similar

ill do some scraping around to find out what i can for you,

forgot to add, simple trick for a blown diode, get a LED, cheapo LED (not a hi brightness or anything) will work as a patch up, but you will probly blow the LED, but it will give you a indication of other damage

mate some scraching around, came up with a quick idea, your 14/15 doesnt make sence you 100% sure thats whats stamped on it?

[Toobs]

Well looks like it's a diode then... I firmly believe it's sole purpose will be reverse polarity protection.
If that is the case then you can either remove it all together or replace it with a 1N4004 or similar as it's function is only to create a short if the polarity is reversed... the theory being that the short would cause the fuse to blow.

If you replace it with a 1N400X then you should wire it between the +ve and earth with the stripe pointing towards the +ve.

[nihilism]

Yes, it's just a normal rectifier diode 1N4004 should do the trick. As to if replacing it will fix the problem or not, it depends on what you did to get it that way and if it's caused further damage.

[river]

Hi,

I'd take a stab at the "1415" to represent IN1415, which is a 400V 1Amp general rectifier, silicon diode. This device can be substituted with the 1N4004 - which can be purchased from Dickhead Smith or Jaycar. Or, assuming it's only there for cross polarity, then remove it - but make sure you connect the positve & negative wires correctly when connecting the unit into the vehicle. And please put in the right amperage fuse otherwise if there is something wrong more stuff will blow on the player, instead of the fuse.

Assuming you did not do any further damage when the diode blew, you should be okay.

seeyuzz
river

[Mos]

Well looks like it's a diode then... I firmly believe it's sole purpose will be reverse polarity protection.
If that is the case then you can either remove it all together or replace it with a 1N4004 or similar as it's function is only to create a short if the polarity is reversed... the theory being that the short would cause the fuse to blow.

Completely agree. You could just remove it, hook up power with the correct polarity and see if it still works. If the fuse did not blow and you removed power because smoke came out of the unit there's a high chance there are other bits damaged.

If you replace it with a 1N400X then you should wire it between the +ve and earth with the stripe pointing towards the +ve.

The + is misleading as it is sitting on the ground side of the diode which will no longer function as a reverse polarity protection diode if hooked up that way. The undamaged diode is hooked up with the Cathode (stripe) to the positive side, and the Anode (no stripe) to the ground plane, with the Anode denoted by the +.

Mos.

[Malicia]

Well I replaced the diode with the 1N4004 and double checked all wires and fuse before reconnecting power. Once power is connected I can hear something inside, Laser? start up but nothing comes up on the face place. So I desided to cut my losses and buy my Inlaws a new Pioneer Cd Player. Works great and the one I blew was playing up anyway.

Thanks for all the help everyone.


+ Rep for everyone..