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Old 11-16-2014, 12:34 AM   #2
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Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
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Posts: 39,205
Default Re: Dell 2407 wfpb no backlight

That is one of those bad black fuse which is used alot in the CMO Inverter board for LCD TV that I replaced lots of them. I believe that is 1.5A fuse, it is used for the PWM IC on the inverter circuit. I use PICO fuse which you will have to bend the legs, no need to remove the old fuse, you can solder one end to the big copper trace and another end to C9 leg.
You can check the resistance on the right side of the fuse and circuit ground to see if it shows very low Ohm, also check the Output pin of the 5V reg to see if it shows low Ohms, that will the idea if you have shorted circuit or not.
I am not sure if that fuse feed the input pin (left pin, center pin is GND, right pin is Output) of the 7805 or not.
You can also put your meter in DCA mode to check the current draw.
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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.

Voltage Regulator (LDO) testing:

Inverter testing using old CFL:

Tear down pictures : Hit the ">" Show Albums and stories" on the left side

TV Factory reset codes listing:

Last edited by budm; 11-16-2014 at 12:43 AM..
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