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At this point you may be better off to replace the whole board, the four C5707 are transistors, not capacitor. You need to make sure that there are no cold solder joints around inverter transformers lead, check the tuning caps in the inverter output sections. Replacement board: http://www.lcdrepair.us
Replace the high voltage transformer. It is the ballast for the backlight.. If you could pinpoint the one that's overheating then that is the one that needs replacement. Much better if you will replace the four transformer...
Hope that answer your question.. Much appreciated if you could rate this help. thanks.
There are 4 c5707/5706 in the inverter transformer driving circuits, the cause of the problem was due to poor solder connection in the bias circuits of the transistors. Make sure to check that after you install the new transistors otherwise you will blowthem up. Common problem with this model. When the circuit drwas too much power from the power supply, it will shut itself off to ptotect itself.
You really need to replace all 4 and also the 2 FU9024 chips and examine all the solder in the inverter area. Also if you have the 2 lamp connector board with a chungwa LCD panel them your lower lamp is probably also bad. Check out www.lcdrepair.us for instructional videos on Dell models as well as repair kits and boards for that unit.
hi. i had the same problem and fixed it. the problem are the 4 transistors (C5707) one of more are shorted (Q739,Q740 and Q759, Q760). Also the fuse PF751 (3a) has to be replaced in most cases. In my case i replaced the fuse and 1 transistor (C5707)