Step 6: Replace the faulty capacitors!
Dell used surface mount electrolytic capacitors on this monitor. They are no different than regular electrolytic capacitors, only a plastic bottom part which enables robots place components on the board.
We will start by replacing two capacitors: 10uF 16V... I heard that most of the time this replacement is enough to make the LCD work again. These two capacitors are labeled as C604 and C507. If changing these won't help, you may try to replace remaining capacitors.
Prepare your soldering iron, solder, utility knife (or something else to cut the capacitor legs short). Start heating your soldering iron...
And the capacitors! Here is the list of all electrolytic capacitors that Dell 1702FP has on board:
2 pieces 10uF 16V (critical ones)
6 pieces 22uF 16V
4 pieces 100uF 25V
De-solder the old capacitors! Polarity is printed on the board, so you don't have to pay attention to polarity when you are de-soldering the faulty ones.
Reshape the legs of the new capacitors into T figure. Trim the long legs, so you'll have legs only long enough to sit on the circuit board firmly.
Solder the capacitors on the circuit board. Pay attention to the polarity. All electrolytic capacitors come with polarity signs on them. Put them on the board in correct direction, otherwise they will blow up. Look at the last photos on this step, these are new capacitors in place.