Blaupunkt CD30 MP3 vauxhall Radio fault..

[liam]

Hi, My problem is with a Blaupunkt CD30 MP3 car radio (Vauxhall).
The radio has blown a fuse and I have looked at it and found what looks like a Diode which has blown apart. I have managed to get a photograph of an undamaged component (see attachment) from a similar radio and the part number on it is EVP 73A.
I have been unable to identify this part and would be grateful if any light can be shed on the identity of the component and possible source for it or a compatible replacement..

Kind Regards, Liam

[R_J]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

Does the diode go across the DC input? that is a Vishay logo
Could be TPSMC36A

[vinceroger69]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

schematics for the radio this may need translating as Hungarian language i think

[liam]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

RJ I will check that tomorrow,.. Thank you for your reply. Much appreciated..

Vinceroger69, thank you for that, this will be a great help..

Regards, Liam
,

[petehall347]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

is that there for reverse polarity ? fuse should blow first though if properly rated fuse .

[liam]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

Does the diode go across the DC input? that is a Vishay logo
Could be TPSMC36A

Yes as far as I can determine it goes across the DC input.., and it is the Vishay logo.
Thank you for your help,. I will purchase one of those and try it..

Regards, Liam

[liam]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

is that there for reverse polarity ? fuse should blow first though if properly rated fuse .

Yes Pete the fuse was blown but the lad had stuck another fuse in and tried it but it blew again. The excess damage to the component may have occurred then.

Regards, Liam

[petehall347]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

looks like it was likely reverse wired then . thats what happens if the fuse is rated too high and the unit is wired reverse polarity . new diode might get it fixed so long as it was fast enough to react and protected everything else .

[liam]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

looks like it was likely reverse wired then . thats what happens if the fuse is rated too high and the unit is wired reverse polarity . new diode might get it fixed so long as it was fast enough to react and protected everything else .

Yes when the car was bought the fuse was gone so can only surmise that the wiring must have been tampered with at some stage.. Fingers crossed that no further damage was caused. I think I have found a replacement diode on ebay so will update when I get that..

[R_J]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

The diode is there for spike protection and would only blow if the polarity was reversed or the input voltage was higher than 50 volts dc. If the diode that was on the board is shorted, that would have protected the rest of the circuit, if it is blown apart, as in open, it no longer protected anything so there may be more damage.
The radio should work without the diode just to test the radio but be sure of proper polarity.
After looking at the schematic, it does'nt seem to match this version of the radio.

[liam]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

The diode is there for spike protection and would only blow if the polarity was reversed or the input voltage was higher than 50 volts dc. If the diode that was on the board is shorted, that would have protected the rest of the circuit, if it is blown apart, as in open, it no longer protected anything so there may be more damage.
The radio should work without the diode just to test the radio but be sure of proper polarity.
After looking at the schematic, it does'nt seem to match this version of the radio.

Yes the diode was shorted so I am hopeful that all will be ok.. No the schematic does not seem to match.. Your Vishay document that lists the EVP device marking code and device type, seems to be the correct part. I have ordered a replacement...

Regards, Liam

[liam]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

Got the new diode yesterday, all good and radio is working fine now so the diode must have done its job.. Thanks to all for your help in this.. Much appreciated,
Regards to all,
Liam

[vinceroger69]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

Thanks for the update glad it was a easy fix.

[petehall347]

Re: Blaupunkt CD30 MP3 vauxhall Radio fault..

well done .