Grundig video 2x4 smoke help

[2ombieboy]

Hi guys, I picked up a V2000 player a Grundig 2x4, fixed it, and was watching a tape on it when it started spewing blue smoke from the power supply board. I have had the board out but cant figure out where the smoke was coming from. there is a strong smell around a large component that I do not know what it is. Its a Siemens AZ3-5656, which is a big blue block. I have done most of the caps on the PCB and they're still fine.

Please any advice and help would be super, as I reallly want to get this back up and running

Alan

This was it playing a few days ago
https://youtu.be/QuWkD0lgJRY

[2ombieboy]

pcb before i did any work

[Freya]

Most likely point would be the blue Mains filter capacitors, you would need to remove to discover which has failed, cant quite see from your picture but also look for any Rifa make capacitors, there could be one nest to the large round transistor on the heatsink.

[2ombieboy]

the blue cap next to the round white toped on is 0.47 @250v can i use any .47 @250 or is it a special cap that has to a dipped one. and probably a stupid question are they still 2 legged + and -. nver worked with large v stuff before

Alan

[Boater Sam]

If that is the blue cap on the extreme left of the pix, it looks like a mains suppressor cap, so it should be X type or X2 type 250v AC, not an ordinary 0.47uf 250v DC cap. That's just a guess as it seems to be next to the mains fuse?
It is still only 2 wires, not polarised and not electrolytic!

[Nickthedentist]

As a test, unsolder the suspect component and try the machine again.

If it works normally, all you need to do is buy a suitable mains filter cap and fit.

Nick.

[2ombieboy]

found the fault it was the .22 @ 250 Mains filter capacitor all the side is blown out. i have 2 replacements the said they they where the right ones at maplins one is 0.47 @250 the other one 0.22@250. let me know it they are as there a lot smaller than what came out

Alan

[2ombieboy]

[MALC SCOTT]

The 224 cap will be ok.

[2ombieboy]

what about the 473k for the 0.47 is that not the correct one? also is there a + lead or are they not polarized?

Alan

[TonyDuell]

These capacitors are not polarised, they can be fitted either way round.

But 473k is not 0.47uF. It's 10 times smaller (0.047uF = 47nF). A 0.47uF capacitor would be marked 474.

You read them a bit like resistors, 2 digits and a multiplier, the value then being given in picofarads (pf). So 473 -> 47*10^3pf = 47nf = 0.047uF. 474 -> 47*10^4pF = 0.47uF

[2ombieboy]

Job done, now back up and running. re capped the board and re done a trace or two as they had started to pull away

Any one know the pin out of the AV socket its a 6 pin DIN. need to make a DIN to RCA cable

Alan

[Freya]

1: AV Switching voltage input (+12V to switch the set to AV)
2: Composite Video input
3: Ground
4: Audio Left
5: +12V output (for switching purpose)(A Bridge from 1 to 5 switches the
set to AV)
6: Audio Right

Connect them in this way to the SCART Connector:

DIN --> SCART

1 8
2 19
3 4+17+21
4 3
5 -
6 1

Pins viewed from solder side

[2ombieboy]

thanks buddy

Alan