Alba LCD19advdw, LCD TV and DVD, 2009

I've some tubular ceramic caps, 1p8 unknown voltage, scraped back the covering and 2.4mm electrode separation , so perhaps 3KV or so. Tried 2 of those on each secondary and no change

So it is 2 wires per tube and 4 tubes, not 2 , it seems. Tried 2 CFL tubes on the monitored side and both light for 1 second. So I can leave one CFL in there and use the other supply to test each TV tube plugged-in in turn, surely 4 could not have failed at once, for 1 second.

Tested each tube and number 4 will not work. Perhaps dodgey connection of one of the other pair, but now the original pair of 2 tubes at the top work for 1 second. Cleaning pcb around HV areas and resoldering HV and monitoring solder points , still 1 second only. What sort of compact load to represent the duff tube? a few neon bulbs in series perhaps. I don't understand the monitoring as connects to midway point of 2 tubes and no meggy resistors around, just 10s of K. One SMD diode marked A2 is used elsewhere in the LV circuitry, as is transtor marked 3FW. 2 perfectly normal pitch spacing SO23 Q marked 7.AJ or 7AJ are not repeated elsewhere but not obviously HV

not 7AJ but A7J I "replaced" the duff tube with 3 neons in series on the ps, and the display and backlighting and DVD play works fine. So looks like the unmonitored side needed a load also to bring the monitoring into valid envelope. I have to admit its not obvious which area of the screen is lacking light, needs wrapping up properly and a normal viewing position perhaps. Would there be 2 long tubes top and bottom and 2 short along the sides or 2 short each along top and bottom, I've not ventured fully inside. The neons run at 24 deg C over ambient, so perhaps 5 or 6 would be better if more than a temporary fudge. Going the other way would a CFL lamp make a TV/laptop backlight exerciser?

Have a small collection of thin tube flourescents from fax/scanner/laptops of unknown states. I know at least one is green but I did not label as such, so made an exerciser for 2 wire tubes , from the CFL board. Tubes between pins 2 and 3.

I have been looking for a practical/cheap solution for the same problem on a DELL 1707FPt computer display. It has four backlight tubes two at the top and two at the bottom. One of them was cracked and very darkened inside, t he rest were fine. Problem is the inverter is not happy without a load on t hat output, runs for one second and shuts down. I tried three 3W resistors in series adding 120K and it works fine, yet the resistors get quite hot. T he missing tube is barely noticeable, it just causes the top 1/3 of the src een to be slightly darker but goes mostly unnoticed. I would be happy to ma ke it work with three tubes, installing the resistors permanently is one so lution but I wondered if the inverter could be modified somehow to disable or ignore that output. The inverter uses a transformer for each pair of tub es so not sure if there is anything that can be done.

This TV was running perfectly happily with 6 neons in series without any droppers, replacing the failed tube for loading purposes, for 3 hours as a try out of whether it was possible