Hello,
I am doing some troubleshooting on the above mentioned LCD television. The service manual says with the single fast blink that there is a lamp problem. I am just trying to determine whether it is the inverter or the ccfls themselves. In the quick flash that the lamps are on, it seems that there are pairs of lamps that are dim/weak while the others are bright. I have tried swapping some of the dim bulbs with the bright ones, and the dim light follows the connector not the bulb itself. So this leads me to the conclusion that the inverter(s) is(are) bad.
The question that I have is: Do/can the transformers/components (per bulb) on the inverters fail in pairs? Are they typically designed to be pairs connected in series? There are about 4 pairs of ccfls that do not light on the display, on both the master and slave inverters.
I have tested what I think is the primary/secondary windings of the transformers (cannot find a datasheet) and there is some variance between the different transformers on board, but there are no open circuits. From a visual inspection, it does not look like there are any burnt components on the inverter boards. Another power supply board has already been tried without success (before I got involved).
From my conclusions it is looking like I need to change out the master & slave inverters to restore proper television operation, but does anybody on here have any other thoughts?
Thanks in advance.
I am doing some troubleshooting on the above mentioned LCD television. The service manual says with the single fast blink that there is a lamp problem. I am just trying to determine whether it is the inverter or the ccfls themselves. In the quick flash that the lamps are on, it seems that there are pairs of lamps that are dim/weak while the others are bright. I have tried swapping some of the dim bulbs with the bright ones, and the dim light follows the connector not the bulb itself. So this leads me to the conclusion that the inverter(s) is(are) bad.
The question that I have is: Do/can the transformers/components (per bulb) on the inverters fail in pairs? Are they typically designed to be pairs connected in series? There are about 4 pairs of ccfls that do not light on the display, on both the master and slave inverters.
I have tested what I think is the primary/secondary windings of the transformers (cannot find a datasheet) and there is some variance between the different transformers on board, but there are no open circuits. From a visual inspection, it does not look like there are any burnt components on the inverter boards. Another power supply board has already been tried without success (before I got involved).
From my conclusions it is looking like I need to change out the master & slave inverters to restore proper television operation, but does anybody on here have any other thoughts?
Thanks in advance.
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