Burnt WD 12v diode, can it be replaced or just cut it off?

Yes. Why are you going to change it from direct though?

d-23 is a 1n4004 diode . replace it and see if that works. It should>

hi;

1. Diode: UF4007, 1000V 1Ampere ; for 72V
2. Diode: GUR460L, 600V, 4Ampere : for 50V
3. Diode: UF5404,400V, 3Ampere: for 6.3V
4. Diode: UF1G, 400V, 1.2Ampere: for 13V
5. Diode: TVR10G, 400V, 1Ampere: for -12V

If it is a matter of just the power supply failing, you can get a replacement. It is possible to remove the HD and place it in a new case with a new power supply, as well. However, if you suddenly smell something burning after that, you are on the trail to adventure. That might be a burnt out diode, easy enough for a PC repair shop to replace. Or, it might be something more serious and you would need an expensive data recover shop to get back your loss. You could call Western Digital customer service and see what they have to offer in terms of a power supply or make use of the following link:


Amazon com 12V AC power adapter for western digital elements WD6400EB035...

Your power supply on the dc output should have the floowing DC voltages, 5v, 12v, and 24v. Just start probing the connectors of the power supply. 24v is needed for the backlights inverter board, 12v for sounds, 5v for logic board.

well from my days in electronic technician school , embarased to say their name because they are not recognised officialy , but my teacher was one hell of a guy Art Scott

we would use a diode on any 5v or 12v power supply line , if it's DC to prevent voltage back flow

which in your situation you got a DC circuit , from what I understand

and that would mean it would be a VERY good idea to USE a diode to prevent any unwanted back flow of voltage , specialy in a DC power feeding line , you don't have to but it's a good idea.
in some situations you absolutely have to if it's a DC critter as in a bridge rectifier or

hey just a side thought , there are 4 diodes in a bridge rectifier for turning AC into DC ,


I would need a detailed circuit print out to be able to tell you whats really going on.

doubtful that you have a bridge rectifier situation happening , probably you just have a blown diode
on the 5v power feed line. that would be extremely good news , as thats easy to test and replace
unless it's a surfface mounted diode micro type.

the history of the diode can get long winded in a hurry , the shotkey family made the shotkey diode
it's more for AC circuits to kinda sorta replace a coil or bridge rectifier , it's excellent as a voltage smoother...

but you're probably dealing with just an ordinary zener diode PNP , or NPN , who really knows without the schematic or testing it , you know the story

it's extremely difficult to deal with microcircuits these days , without a lab and the extremely expensive tools to work on them , such as electron microscope lol , the electronics industry
which is basicaly IBM and the others lol don't really want the general public to be able to work
on anything , shhh it's conspiratorial thinking lol

you just kinda opened up an old wound is all , back then I thought the specifications of a diod would never change and that I would be able to build anything electronic that I wanted , but now thats changed and you need machines to make machines now , it hurts my geek pride a bit but I'll get even one day lol

I don't really know what to say except try your best with what you have , and if you simply feel this
situation is beyond your ability , it's not shameful to send it to people who can fix it.

I admire you for trying , and I appreciate you , you made this old ( in geek terms ) 38 year old engineer feel better about things , and made me reflect.

the polarity was reversed and semiconductors are burnt at the output of the unit.

that diode is a reverse polarity protection diode. An 1N414 will do ( available for very very little from almost ALL electronic component suppliers.) If there is NOTHING ELSE WRONG then the tomtom will still work without this diode. Its not needed in normal operation anyway. All it does is cause the fuse to blow in the cigarette lighter plug if the polarity is accidently reversed. Therefore , with a correct supply , it does nothing !

that is not a diode it is a one time fuse you can try putting 12V on the the output of the fuse and see if it work if it dose then put a new fuse in there

Easy fix!!!!!!! CUT JUMPER 300 on main board _ [FACTORY DEFECT] protection jumper
If you have a warranty take TV back to store if not easy fix.