FIXED CR4 ROL Led Mod: How?

I

iTzCalvinFTW

Full Member
Sep 3, 2014
96
0
The Netherlands
Hi guys,

So I just installed my Demon and CR4 successfully in my Trinity board. Before the CR4 there was a Coolrunner Rev C installed to the console which had a ROL Glitch led mod. I would like to have that with my CR4 too. On the CR4 I can see the pad ROL, this is my current setup but it is not working. Can you guys help me on this?

Negative Point - Wire - Negative Point of Extra LED - Wire - ROL Pad (on CR4)

I can add some images later on if the above is unclear...

Here's the template, I don't think you'll need it but I don't want to get this post removed.


  • Console Type: Trinity
  • Programmer Used: NAND-X & Demom
  • NAND Size: 16
  • Dashboard version: RGH: 16747, Retail: 17150
  • CB Version: n.a
  • Screenshot of NAND details from J-Runner: n.a
  • J-Runner log: n.a
  • updflash.bin log: n.a
  • Image of the CR4 XL: tell me if necessary
  • Images of close-up soldering to motherboard: tell me if necessary
  • Detailed Description of the Problem: Read the above
  • Was the console working before you started: Y
  • Do you get a green debug light appear on the CR4 XL chip every 4-5 seconds: Y
  • How long is the light on for each time (be aware that if you're trying to work on a faulty console, this is not a T-X product issue!!).: split second

Thanks, Calvin
 
Antalpromille

Antalpromille

VIP Member
Aug 4, 2011
3,146
0
Borås, sweden
You could look at my thread in the successful CR4 category for a solution to make your old ROL mod work.

My way is only one way, there are surely more solutions for this.
 
Last edited:
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iTzCalvinFTW

Full Member
Sep 3, 2014
96
0
The Netherlands
Krafter said:
You have it wired wrong. Wire the positive side of the LED to 3.3V and the negative side to the ROL pad.
Click to expand...
Krafter said:
That should work.
Click to expand...
Antalpromille said:
You could look at my thread in the successful CR4 category for a solution to make your old ROL mod work.

My way is only one way, there are surely more solutions for this.
Click to expand...
I am feeling so stupid right now... Wanted to finish the ROL mod quickly, used my old soldering iron, cause my cousin borrowed my new one. The old one had some massive problems... One of them was overheating on the lowest setting. So stupid of me, I used the iron and lifted the pad of ROL!!! :( I really hope you guys know a fix? ? Is there an alternative? :(

Thanks
 
L

lonix

Senior Member
Dec 17, 2011
120
0
melbourne, Australia
iTzCalvinFTW said:
I am feeling so stupid right now... Wanted to finish the ROL mod quickly, used my old soldering iron, cause my cousin borrowed my new one. The old one had some massive problems... One of them was overheating on the lowest setting. So stupid of me, I used the iron and lifted the pad of ROL!!! :( I really hope you guys know a fix? ? Is there an alternative? :(

Thanks
Click to expand...
Can you post a photo?

I'm sure it's not to bad [emoji16]
 
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Antalpromille

Antalpromille

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Aug 4, 2011
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Borås, sweden
iTzCalvinFTW said:
Actually it is very bad, also tried to fix it with my old iron and whole pad messed up...

http://imgur.com/L5gLqyG
Click to expand...
Doesn't look that bad except for the fact that the pad is gone and the boards is covered in Flux. The soldering looks good except for that. I may pin out the pads later if I get time over.
 
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Antalpromille

Antalpromille

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Aug 4, 2011
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i dont have time to map all pins today but the ROL-pad is directly connected to R42 (the side closest to the edge of the PCB).
 
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T

The Result

Senior Member
Jan 15, 2014
128
0
Dayton, Ohio
You can also solder to the left side of R40 resistor it probably just wasn't working because your LED is over rated.
It is next to where your DemoN to CR4 ribbon cable goes.
 
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Krafter

Krafter

VIP Member
Apr 17, 2011
3,737
118
Indiana
You need to use caution when connecting the LED. I don't have a CR4 to look at but I imagine that there was a resistor in series with the pin on the IC and the ROL pad. You would either need to be on the opposite side of the resistor or add your own (it can go on either side at that point). To calculate the size of the resistor use the following formula.

R = (voltage source - LED forward voltage) / LED forward current.

So if you had a voltage source of 5v, LED forward voltage of 3.4 (5mm blue LED) and a forward current of 20ma it would look like this.

R = (5 - 3.4) / .02
R = 1.6 / .02
R = 80 Ohm

You can google the size and color of LED you have to find the specs on it.

*.02 is the same as 20ma
 
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Antalpromille

Antalpromille

VIP Member
Aug 4, 2011
3,146
0
Borås, sweden
Krafter said:
You need to use caution when connecting the LED. I don't have a CR4 to look at but I imagine that there was a resistor in series with the pin on the IC and the ROL pad. You would either need to be on the opposite side of the resistor or add your own (it can go on either side at that point). To calculate the size of the resistor use the following formula.

R = (voltage source - LED forward voltage) / LED forward current.

So if you had a voltage source of 5v, LED forward voltage of 3.4 (5mm blue LED) and a forward current of 20ma it would look like this.

R = (5 - 3.4) / .02
R = 1.6 / .02
R = 80 Ohm

You can google the size and color of LED you have to find the specs on it.

*.02 is the same as 20ma
Click to expand...
This is good information but I don't think it's needed on CR4. ROL pad is directly connected to R42 wich is 100ohm and should hold the current (and voltage) low enough to not kill the LED.
 
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I

iTzCalvinFTW

Full Member
Sep 3, 2014
96
0
The Netherlands
Krafter said:
You need to use caution when connecting the LED. I don't have a CR4 to look at but I imagine that there was a resistor in series with the pin on the IC and the ROL pad. You would either need to be on the opposite side of the resistor or add your own (it can go on either side at that point). To calculate the size of the resistor use the following formula.

R = (voltage source - LED forward voltage) / LED forward current.

So if you had a voltage source of 5v, LED forward voltage of 3.4 (5mm blue LED) and a forward current of 20ma it would look like this.

R = (5 - 3.4) / .02
R = 1.6 / .02
R = 80 Ohm

You can google the size and color of LED you have to find the specs on it.

*.02 is the same as 20ma
Click to expand...
Krafter said:
OP what type and color of LED are you using?
Click to expand...
The Result said:
You can also solder to the left side of R40 resistor it probably just wasn't working because your LED is over rated.
It is next to where your DemoN to CR4 ribbon cable goes.
Click to expand...
Antalpromille said:
i dont have time to map all pins today but the ROL-pad is directly connected to R42 (the side closest to the edge of the PCB).
Click to expand...
Antalpromille said:
Doesn't look that bad except for the fact that the pad is gone and the boards is covered in Flux. The soldering looks good except for that. I may pin out the pads later if I get time over.
Click to expand...
Antalpromille said:
This is good information but I don't think it's needed on CR4. ROL pad is directly connected to R42 wich is 100ohm and should hold the current (and voltage) low enough to not kill the LED.
Click to expand...

Thank you all! I really appreciate all the support that you guys are giving! I fixed it! Sorry for the late reply, vacation stuff
 
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