Dell U2410 monitors (not all?) hum loudly when the brightness is reduced below about 78%. Dell claims this is not a defect, but the nearly identical U2711 does not have this problem.
I have a Dell U2410 rev. A04 with the LG panel module LM240WU4. When I opened the monitor, I found there to be three sources of sound. The main power-supply board and the inverter board both emit a faint hiss that I could not hear when the monitor was assembled. The loud buzzing appears to be within the LG panel, on the right side, just where the middle CCFL tube terminates.
Getting into that area would be a lot more work. Also, I wouldn't be able to run the unit to produce the noise. Any ideas on what the problem might be or how to test it?
One thing I did consider is a bad component on the inverter board. With extra wiring, I swapped around the CCFL tubes to different transformers. The noise always stayed in the same place.
Also, I'd appreciate any info on how the relevant parts of the U2711 differ from the U2410.
Thanks
I have a Dell U2410 rev. A04 with the LG panel module LM240WU4. When I opened the monitor, I found there to be three sources of sound. The main power-supply board and the inverter board both emit a faint hiss that I could not hear when the monitor was assembled. The loud buzzing appears to be within the LG panel, on the right side, just where the middle CCFL tube terminates.
Getting into that area would be a lot more work. Also, I wouldn't be able to run the unit to produce the noise. Any ideas on what the problem might be or how to test it?
One thing I did consider is a bad component on the inverter board. With extra wiring, I swapped around the CCFL tubes to different transformers. The noise always stayed in the same place.
Also, I'd appreciate any info on how the relevant parts of the U2711 differ from the U2410.
Thanks
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