CCFL not starting properly with replacement Inverter

[Spode]

Hi,

Please see these threads for past issues to do with me trying to fix this Toshiba 32C3035D TV.

https://www.badcaps.net/forum/showthread.php?t=12604

https://www.badcaps.net/forum/showthread.php?t=12874

I am now at the stage where I have replaced the inverters with different units from a Philips TV that looked almost identical (same connectors for 24V input).

I didn't have the correct ribbon cable and using a CAT5 cable introduced too much resistance. So I instead created an extension cable for the right hand CCFL and then used short lengths of wire to connect the boards together (see attached), separated by plastic stand-offs.

The PCB design had nice copper pads that went to each pin which made connecting in this way quite easy and I'm sure nothing is shorted out. The extra wire in the picture is just a grounding wire as they old units were screwed to the chassis, which I can no longer do.

Problem :

The backlights now turn on for 2 seconds and aren't bright enough to light the whole screen (blackish area in the middle of screen). I've seen what it was like with the old inverters and it should be much, much brighter!

- Are the inverter boards simply not powerful enough? (the MOSFETs on the old boards do seem much bigger)

- Are the voltages just wrong for these CCFL units and I need to replace them with different ones?

Any ideas?

[Spode]

Re: CCFL not starting properly with replacement Inverter

From what I've read - there are several specs for a CCFL:

- Strike Voltage
- Steady State Voltage
- Steady State Current
- Steady State Power Consumption

As the tubes light up - I'm guessing the first two aren't the issue - but it's probably the current available that is the issue.

Considering the size of the MOSFETs on the old inverter boards were so much bigger (which I'm assuming means delivers more power) - could it be as simple as me replacing those with larger ones - or would the rest of the circuit need adjustment too?