Pictures of module
Removed heat transfer compound.
useless CAN-BUS resistor1st I removed stupid "can-bus" resistor, it is there just to generate heat. It's marked as 271 which mean 270Ohm so current which this resistor generate in 12V environment is 40mA (12/270). As original bulb are 5W they run at 416mA on 12V so this resistor is really just heat source ....
SchematicsUsing PT4211 current is defined by Rs resistor value, manufacturer value is 0.82Ohm, based on datasheet current is calculated as 0.2/Rs so ~250mA (0.2/0.83 = 0.2439A). This mean 60mA over each led. I try 2R2 and 4R7 resistor which mean 90mA or 42mA.
I use my samsung to measure output of these modules with changed resistors
Rsens = 0.82Ohm (original) 9500x at 220mA (170 with removed 271 resistor)
Rsens = 2.2Ohm 3800lx at 66mA
Rsens = 4.7Ohm 1400lx at 27mA
Pictures of instaled modules
|original modules with 0R82 sens resistor (i cant remember if this is 1 or 2 modules in car)|
|1 module with 2R2 sens resistor|
|1 module with 4R7 sens resistor|