On Sun, 27 Jul 2008 13:55:16 -0500, bob urz put
finger to keyboard and composed:

Any good tips for testing LCD inverters and the CCFL tubes
they hook to?

What i thought about is making a external jig or such to power each bulb
up and seeing if they light. Is there a way to sub a dummy load
on the Inverters for the bulbs to test? It would have to have a high
voltage zenar with high z series resistor or such on it to simulate the
CCFL plasma voltage of conduction?

Bob

FWIW, this manufacturer tests their inverters with a 120K resistive
dummy load:
http://www.zippy.com/backend/downloa...0Rev%201.5.pdf

It simulates a 6mA, 720V lamp.

This one uses a 110K dummy load (for 6.7mA lamp current):
http://www.gztm.com/down/INV010601-01.pdf

This one specifies a 100K dummy load for 6-7mA:
http://www.bonafidecn.com/PDF/OB3318...ona%20fide.pdf
(4MB)

I'm not sure that such a steady state test would be conclusive, as it
may not test the inverter's ability to generate the much higher
striking voltage.

AFAICT, the current rating of an unknown lamp can be inferred from the
current sense resistor (say 470 ohms) in the lamp circuit. It seems
that many lamp controller ICs expect to see a 3V feedback voltage
across this resistor.

- Franc Zabkar
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