As the title says, my scanner's ccfl tube/driver is dead. The original light, with the same board out of the scanner, powered with a 12v source produces no light.
I wanted to find a replacement for the onboard transformer, I thought a quick search would yeld some replacemet part.. but nope! They are really hard to find (?). Its layout is the one pictured below:
Between pin 6 and 10 I measure 196ohm, the feeback has around 0,6ohm, the primary between 1 and 3 it's 1,5ohm and the middle reads around 0,7/0,8 between 1 and 3. It looks fine.. never the less I simply wanted to replace all the parts, tube too, keeping the original board.
Where do I start looking for a trafo replacement? I only found some promising parts on https://www.coilcraft.com/ccfl.cfm, and given the input voltage, I'll need a 2,5W N=100, but the form factor is wrong: I need a through-hole pinout.
I also disassembled a standard CCFL inverter for modders, but the circuit is slightly different and the transformer has another pinout. I would have simply replaced the board, but the one in the scanner has a compact shape with a hole in the middle for a screw
Funny detail, if I hover my hand over the tube/board it lights up more (better if I also hold something metallic - but never more than half). Also, I identifyed the scanner's board as a simple Royer circut, exaclty the one (type 1, the simplest) you can find on the wikipedia page.
I replaced all the parts, one by one with no improvement what so ever, apart the transformer. So in the end: is it the trafo or still something else? Tnx!
I wanted to find a replacement for the onboard transformer, I thought a quick search would yeld some replacemet part.. but nope! They are really hard to find (?). Its layout is the one pictured below:
Between pin 6 and 10 I measure 196ohm, the feeback has around 0,6ohm, the primary between 1 and 3 it's 1,5ohm and the middle reads around 0,7/0,8 between 1 and 3. It looks fine.. never the less I simply wanted to replace all the parts, tube too, keeping the original board.
Where do I start looking for a trafo replacement? I only found some promising parts on https://www.coilcraft.com/ccfl.cfm, and given the input voltage, I'll need a 2,5W N=100, but the form factor is wrong: I need a through-hole pinout.
I also disassembled a standard CCFL inverter for modders, but the circuit is slightly different and the transformer has another pinout. I would have simply replaced the board, but the one in the scanner has a compact shape with a hole in the middle for a screw
Funny detail, if I hover my hand over the tube/board it lights up more (better if I also hold something metallic - but never more than half). Also, I identifyed the scanner's board as a simple Royer circut, exaclty the one (type 1, the simplest) you can find on the wikipedia page.
I replaced all the parts, one by one with no improvement what so ever, apart the transformer. So in the end: is it the trafo or still something else? Tnx!