Hello everyone,
I'm writing here hoping to fix my Dell 2405FPW monitor.
I was able to unbuilt the assembly and discover that the main power supply (48.L1E02.A03) had a few bulged capacitors (C702, C711, C712, C713, C714, C715), while the remaining ones (including the massive 450V one seem to be intact).
After replacing them, I was able to measure that the top connector (CN702) that goes into the backlight TDK board correctly receives 19V on pins 4/5/6, and that the connector to the other board with the display inputs (CN701) receives 19V on pin 4 but nothing on pin 7 or pin 9 (this last is supposed to be 12V), as seen on a schematic found on this forum.
When fully plugged in, and in standby mode, there is an evident coil whine noise coming from this PSU board or the backlight board (cannot identify it precisely), which disappears once one attempts to boot the monitor. At this point, the backlight briefly flashes for one instant and occasionally displays a very faint green screen; then goes immediately to black.
By pressing the front display buttons, the source LEDs rotate correctly so that logic seems functional even when there is no image / backlight.
To summarize, apart from those bulged caps I did not notice any other burned/damaged parts on the rest of the screen and would like to know how you would proceed.
Thank you in advance for your help !
I'm writing here hoping to fix my Dell 2405FPW monitor.
I was able to unbuilt the assembly and discover that the main power supply (48.L1E02.A03) had a few bulged capacitors (C702, C711, C712, C713, C714, C715), while the remaining ones (including the massive 450V one seem to be intact).
After replacing them, I was able to measure that the top connector (CN702) that goes into the backlight TDK board correctly receives 19V on pins 4/5/6, and that the connector to the other board with the display inputs (CN701) receives 19V on pin 4 but nothing on pin 7 or pin 9 (this last is supposed to be 12V), as seen on a schematic found on this forum.
When fully plugged in, and in standby mode, there is an evident coil whine noise coming from this PSU board or the backlight board (cannot identify it precisely), which disappears once one attempts to boot the monitor. At this point, the backlight briefly flashes for one instant and occasionally displays a very faint green screen; then goes immediately to black.
By pressing the front display buttons, the source LEDs rotate correctly so that logic seems functional even when there is no image / backlight.
To summarize, apart from those bulged caps I did not notice any other burned/damaged parts on the rest of the screen and would like to know how you would proceed.
Thank you in advance for your help !
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