LC+2.0 0-6-0 Docksider Switcher no forward light only reverse

The LC+ 2.0 logic board drives each LED individually.  The PCB is obviously just a junction box.

@gunrunnerjohn posted:

The LC+ 2.0 logic board drives each LED individually.  The PCB is obviously just a junction box.

Thanks for the reply John.

So if I want to start by testing the headlight first, how many volts should I apply to it?  3V ?

Thanks,

John

Use a 1K resistor and a 9V battery in series.  The 1K resistor keeps you from getting excessive current through the LED.

@gunrunnerjohn posted:

Use a 1K resistor and a 9V battery in series.  The 1K resistor keeps you from getting excessive current through the LED.

Finally put in some eye drops so I could see and it turns out that that little PCB are the cab lights.

Using a 1K resistor in series with a 9V battery I tested the rear light.  It lit  I tested the cab lights.  They lit.  I tested the front (headlight) light.  I did NOT light.

So I have two choices.

1.  See if I can buy the replacement light which I assume includes the housing

2.  Take off the old housing and replace the inside LED with one that I have in my stock of LEDs

If the housing is not available, which LED would you recommend for the existing housing?

Thanks,

John

EDIT:  No illustrations on Lionel Support Site.  Lionel 2032030  Bethlehem Steel #76 0-6-0-T

https://www.lionelsupport.com/...l-76-PARTS-BREAKDOWN

@Craftech posted:

Finally put in some eye drops so I could see and it turns out that that little PCB are the cab lights.

Using a 1K resistor in series with a 9V battery I tested the rear light.  It lit  I tested the cab lights.  They lit.  I tested the front (headlight) light.  I did NOT light.

So I have two choices.

1.  See if I can buy the replacement light which I assume includes the housing

2.  Take off the old housing and replace the inside LED with one that I have in my stock of LEDs

If the housing is not available, which LED would you recommend for the existing housing?

Thanks,

John

EDIT:  No illustrations on Lionel Support Site.  Lionel 2032030  Bethlehem Steel #76 0-6-0-T

https://www.lionelsupport.com/...l-76-PARTS-BREAKDOWN

cs-6911321323-p

PCB W/ LED /Â 0-6-0T  Part #5 ???

You might try expanding your parts search. The older 0-6-0's look identical to the LC's . Other that the cab number, you may find the part from one of them.

Reading is LC+2.0, Santa Fe conventional

I'd pick a warm white or amber LED that is the same form-factor as the one that's there currently.  In my 2020 LC+ 2.0 0-6-0 engines, it's a surface mount LED, I presume on a very small PCB.

@gunrunnerjohn posted:

I'd pick a warm white or amber LED that is the same form-factor as the one that's there currently.  In my 2020 LC+ 2.0 0-6-0 engines, it's a surface mount LED, I presume on a very small PCB.

Actually the front lens of the housing comes right off.  Here is what it looks like:

You're right.  An amber SM  LED on a small PCB.

Is the PCB necessary?  What voltage SM LED?

Thanks,

John

@RSJB18 posted:

You might try expanding your parts search. The older 0-6-0's look identical to the LC's . Other that the cab number, you may find the part from one of them.

Reading is LC+2.0, Santa Fe conventional

Thanks for the suggestion Bob.

Regards.

John

It's a white LED, so it's going to be rated right around 3V.  However, remember that LED's are current mode devices, I believe that board supplies a current limited current to the LED.  It's a transistor emitter follower that supplies around 4.4 volts through a 270 ohm resistor.  So, any white LED will be fine as no common LED is rated below the roughly 6 milliamps that they get from the board.

@gunrunnerjohn posted:

It's a white LED, so it's going to be rated right around 3V.  However, remember that LED's are current mode devices, I believe that board supplies a current limited current to the LED.  It's a transistor emitter follower that supplies around 4.4 volts through a 270 ohm resistor.  So, any white LED will be fine as no common LED is rated below the roughly 6 milliamps that they get from the board.

Got it.

Thanks,

John

Been dealing with a bunch of medical issues, but finally replaced the existing burned out LED headlamp with an LED from Evan Designs that I had.  It is the Deka lamp.  I unsoldered the leads the LED came with and soldered the Red and Black wires to the back of it.  Here are the results:

Thanks (as always) for helping me with this repair.

Regards,

John

Looks good to me.