Have a HP Toucsmart 310 (AIO machine), no backlight, system works fine. Doesn't seem to be a 2-seconds-to-black failure, just never seems to come on at all (I could be wrong but it's a little harder to test on an AIO because you can't get signal prior to powering up for obvious reasons).
I've tested the actual CCFL tubes, they seem to be running (though dimly with the generic tester).
It's a dual-output inverter. I've tested the following;
* input; no short to ground. Zener is good at 5.6V, fuse is good
* transformers; 614R on secondary, ~0R1 on primary
Beyond those quick checks I'm not sure what to check for next or if there's any "good known" failure points.
I've tested the actual CCFL tubes, they seem to be running (though dimly with the generic tester).
It's a dual-output inverter. I've tested the following;
* input; no short to ground. Zener is good at 5.6V, fuse is good
* transformers; 614R on secondary, ~0R1 on primary
Beyond those quick checks I'm not sure what to check for next or if there's any "good known" failure points.
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