Heater Controls - PCB Polarity ?, Help Please Options

[3TST]

I've started desoldering the LEDs from the Heater Control PCB.
I have now received my new LEDs.
However, they have a + and - wire.
The longer of the 2 wires being positive.
Problem is...I'm trying to work out the polarity on the PCB.
That is, the positive and negative circuits.





I also have the same question relating to the window switch.



Can anyone help please?

[BloodyStupidDave...]

You need to look at the side of the PCB with the silkscreen on. LEDs have a symbol like this:



The triangle points to a vertical bar:

>|

The vertical bar is the negative side of the LED. Sometimes the two arrows pointing away from the |< are omitted (strictly speaking the latter is the symbol for a diode but sometimes used for LEDs also).

This post has been edited by BloodyStupidDavey: Nov 10, 2008 - 6:21 PM

[3TST]

Cheers mate.

The triangle points to a vertical bar: >| ...symbol for a diode

That's what through me on the window switch.
OK for the window switch now.

But for the PCB...

You need to look at the side of the PCB with the silkscreen on....look for symbol...

I assume the silkscreen is the green side with the track on.
Problem is, I don't seem to be able to see that symbol anywhere.

Can you tell I haven't done this before

[WWSideWinder]

Hi 3TST

OK I finished my AC Unit last night and I have some photos that may help.

1st thing is to get a Multi Meter with the diode tested "http://en.wikipedia.org/wiki/Multimeter"

Get something like this "http://www.screwfix.com/prods/14469/Electrical/Electricians-Tools/Circuit-Testers/Autoranging-Digital-Multimeter?cm_mmc=GoogleBase-_-Datafeed-_-Electrical-_-Autoranging%20Digital%20Multimeter" only 10 Pound!

This tool is your best friend when you work with electricity.

In your last Photo (above) it shows the ->|- (diode) symbol so flop your AC board over from the way you have it in the 1st Photo.

Sorry if this sounds a bit Preachy but it should help you.

Have a look at "http://www.6gc.net/forums/index.php?showtopic=63338" (My Thread) and scroll to the end for a look at how I have done my Car (and AC Unit)

WWSideWinder

[3TST]

Thanks for your help.
LEDs are coming out so much easier

Have a look at "http://www.6gc.net/forums/index.php?showtopic=63338" (My Thread)

Think you'll find that is this thread

Still can't work out PCB polarity
Sent you a PM based on this pic:


This post has been edited by 3TST: Nov 11, 2008 - 5:46 PM

[WWSideWinder]

http://www.6gc.net/forums/index.php?showtopic=63338 is my thread on the updates done to my Curren.

You rAC Board is different to my one.

I'll have a look at th eorientation of yours to myne and work it from there.

[BloodyStupidDave...]

I assume the silkscreen is the green side with the track on.

Silkscreen is the (usually white) writing. Silkscreen actually describes the process of printing the writing:

http://en.wikipedia.org/wiki/Silkscreen

[GriffGirl]

I assume the silkscreen is the green side with the track on.

Silkscreen is the (usually white) writing. Silkscreen actually describes the process of printing the writing:

http://en.wikipedia.org/wiki/Silkscreen

So basically, flip the board over to see where the >| symbols are

This is gonna come in real handy for me some day!

[brk34]

you could power the board and with a DMM and check for the polarity that way only for a low voltage board or with extreme caution (ex your dryer).

FYI the green lines cover an insulate the "traces" which are the copper lines on the board


This post has been edited by brk34: Nov 12, 2008 - 7:34 PM