Hi,
I was hoping to get some guidance on repairing an LED Driver which failed.
I discovered no damage to any components with a visual check, or no bad solder joints.
With some simple continuity tests I determined that F1, which I assume is a flameproof/fuseable resistor, failed. There was no continuity, but working drivers did have continuity.
I also assumed it as a Vishay PR02 4R7 resistor (that a 2W one). Based on the resistor colour, the wire diameter and general appearance.
So I replaced the part, connected it up and poof!!
The same part blew. TBH I didn't have high hopes, I expected this failed as something else downstream had failed and this was a safety feature.
Anyway I'm out of ideas. Having working drivers I compared continuity, if something had failed open or closed, and so far following the tracks and comparing values with the DMM everything looks just the same as the working one.
I wanted to see if anyone has some ideas. This is not the kind of thing I would put back in service, but I'm treating this as a learning exercise.
https://www.tridonic.com/com/en/products/led-driver-lca-15w-180-350ma-flexc-ph-c-sr-adv.aspSome Tech Spec's: Driver LCA 15W 180-350mA flexC PH-C SR ADV
Product descriptionDimmable constant current LED Driver (SELV)
Independent LED Driver with cable clamps
Dimmable via leading edge and trailing edge phase dimmers
Dimming range 5 to 100 % (depending on dimmer)
For luminaires of protection class I and protection class II
For luminaires with M and MM as per EN 60598, VDE 0710 and VDE 0711
Temperature protection as per EN 61347-2-13 C5e
Selectable output current between 180, 250 and 350 mA
Max. output power 15 W
Up to 81 % efficiency
Nominal lifetime up to 50,000 h
5 years guarantee
Housing propertiesCasing: polycarbonate, white
Type of protection IP20
Interfaces
Terminal blocks: 0° screw terminals
FunctionsOverload protection
Short-circuit protection
No-load protection
Overtemperature protection
Burst protection voltage 1 kV
Surge protection voltage 1 kV (L to N)
Surge protection voltage 2 kV (L/N to earth)