Help with shortening led circut board - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

MemphisR · 03-03-2016, 01:51 AM

Hello All,

I am looking for help from anyone that has some wiring expertise and tell me or help me figure out how to shorten this LED board. I am making a custom high mount, but this one board is too long. I have noticed that on each board, there are 12 LEDs and 1 resistor per every 4 LEDs. Please help me figure out how to eliminate the last group of four LEDs from the end of the board.

Thanks,
MemphisR

Ashikabi · 03-03-2016, 11:55 AM

Quote:

Originally Posted by MemphisR

Hello All,

I am looking for help from anyone that has some wiring expertise and tell me or help me figure out how to shorten this LED board. I am making a custom high mount, but this one board is too long. I have noticed that on each board, there are 12 LEDs and 1 resistor per every 4 LEDs. Please help me figure out how to eliminate the last group of four LEDs from the end of the board.

Thanks,
MemphisR

I'm no expert but I think they just run in a line, should be able to just cut the 4 off the end and solder wire leads to it. FYI there is a high mount kit available for the 05/09 mustang from Classic Design Concepts for about $50 that fits well. Good luck with your project

jvincent · 03-03-2016, 12:12 PM

It's hard to make out from the picture put if the power tracks go to each resistor/LED group in parallel, then all you need to do is cut the board AFTER the last group you want to keep and you should be fine.

If they are wired serially then after you cut you will need to add a jumper wire to complete the circuit.

A parallel circuit would be the safe assumption since that would mean any single failure wouldn't take out the whole strip.

MemphisR · 03-03-2016, 03:20 PM

Quote:

Originally Posted by Ashikabi

FYI there is a high mount kit available for the 05/09 mustang from Classic Design Concepts for about $50 that fits well. Good luck with your project

I am familiar with that kit, but they don't make a full width one

Ashikabi · 03-03-2016, 03:21 PM

Quote:

Originally Posted by MemphisR

I am familiar with that kit, but they don't make a full width one

Use 3? Jk want sure if you needed custom or just didn't know

MemphisR · 03-03-2016, 03:26 PM

Quote:

Originally Posted by jvincent

It's hard to make out from the picture put if the power tracks go to each resistor/LED group in parallel, then all you need to do is cut the board AFTER the last group you want to keep and you should be fine.

If they are wired serially then after you cut you will need to add a jumper wire to complete the circuit.

A parallel circuit would be the safe assumption since that would mean any single failure wouldn't take out the whole strip.

I tried it after removing the end four LEDs, nothing. I then added a wire jumper from the middle two wires/leads and still nothing...with the exception that I blew a fuse.

Thanks for your help

Ashikabi · 03-03-2016, 03:31 PM

Quote:

Originally Posted by MemphisR

I tried it after removing the end four LEDs, nothing. I then added a wire jumper from the middle two wires/leads and still nothing...with the exception that I blew a fuse.

Thanks for your help

Did you cut it right at that hole? It really looks like it should have worked... you didn't hook it up backwards did you? I think LEDs are 1 way

MemphisR · 03-03-2016, 03:45 PM

Quote:

Originally Posted by Ashikabi

Did you cut it right at that hole? It really looks like it should have worked... you didn't hook it up backwards did you? I think LEDs are 1 way

I did uct it off at the hole. I also tried it both ways.

jvincent · 03-03-2016, 03:48 PM

Quote:

Originally Posted by MemphisR

I tried it after removing the end four LEDs, nothing. I then added a wire jumper from the middle two wires/leads and still nothing...with the exception that I blew a fuse.

Thanks for your help

Where exactly did you put the jumper that blew the fuse?

If you can get a higher contrast picture of the back of the board it would help. Or better yet, the schematic.

MemphisR · 03-03-2016, 03:51 PM

The second hold from the right it were i attached the jumper and it was attached to the two middle wires/leads. I will take better photos tonight, and try to find the schematic as well

Ashikabi · 03-03-2016, 03:54 PM

Quote:

Originally Posted by MemphisR

The second hold from the right it were i attached the jumper and it was attached to the two middle wires/leads. I will take better photos tonight, and try to find the schematic as well

As far as I can tell there are just 2 wires there. Shoulda worked. Eager to see how this gets fixed

ZOMFGAARON · 03-03-2016, 04:02 PM

You should try to post on the retro fit source forum. Those dudes know all there is to know about lighting.

Sent from my iPhone using Tapatalk

jvincent · 03-03-2016, 04:04 PM

Quote:

Originally Posted by MemphisR

The second hold from the right it were i attached the jumper and it was attached to the two middle wires/leads. I will take better photos tonight, and try to find the schematic as well

I can't be 100% sure since the tracks on the board aren't clear, but I think you shorted the power supply with that wire, which would explain the fuse blowing.

mabviper · 03-03-2016, 07:17 PM

I looked at the PCB. You should cleanly cut the board on the 2nd hole from the right. Don't short any wires since the 2 leads are power and ground. That'll cause the blown fuse. It should just work as is. The circuit is connected as 3 parallel led strings. Each led string is connected in series. Hope that helps.

Sent from my Nexus 4 using Tapatalk

03-03-2016, 07:17 PM	#14
mabviper Senior Member Join Date: Jul 2013 Drives: WRB BRZ Location: Toronto, Canada Posts: 286 Thanks: 21 Thanked 161 Times in 97 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	I looked at the PCB. You should cleanly cut the board on the 2nd hole from the right. Don't short any wires since the 2 leads are power and ground. That'll cause the blown fuse. It should just work as is. The circuit is connected as 3 parallel led strings. Each led string is connected in series. Hope that helps. Sent from my Nexus 4 using Tapatalk __________________ Custom datalogger with GPS Support

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jvincent Senior Member Join Date: Sep 2013 Drives: 2022 WRB BRZ Sport-Tech Location: Ottawa, Canada Posts: 1,746 Thanks: 131 Thanked 1,410 Times in 715 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	It's hard to make out from the picture put if the power tracks go to each resistor/LED group in parallel, then all you need to do is cut the board AFTER the last group you want to keep and you should be fine. If they are wired serially then after you cut you will need to add a jumper wire to complete the circuit. A parallel circuit would be the safe assumption since that would mean any single failure wouldn't take out the whole strip.

03-03-2016, 04:02 PM	#12
ZOMFGAARON A Demon Join Date: Dec 2013 Drives: Raven GT86 Location: Denver Posts: 1,992 Thanks: 190 Thanked 1,321 Times in 701 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	You should try to post on the retro fit source forum. Those dudes know all there is to know about lighting. Sent from my iPhone using Tapatalk

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