Hp pavilion f1930 shows pic for 2 secs. then blank
Rather than guessing, or blaming the computer, I fix the F1903 backlight problem. Power the monitor and using a bright flashlight check the screen to ensure there's an image, or the menu when you press the menu button. Nearly every one of the F1703 and F1903 monitors I've repaired have all been backlight issues. If you have an image proceed with these instructions. This is a repair for those people competent in component level electronics repair with good soldering skills. Items needed, Crosstip screwdrivers, fine tipped soldering pencil, fresh rosin core solder, (4) "2SC5706" or "C5706" Transistors. Remove the 4 screws holding the base, set the base aside. Lay the monitor face down on a surface that won't damage the screen or Bezel. Remove the 4 screws holding the back on.Carefully pry the back away from the bezel. Be careful in doing this because the display controls are attached to the bezelremove the 4 screws holding the control board on. Turn Monitor face up, remove bezel. With the Monitor Face up remove the Machine screws around the edge of the case. Carefully place the monitor face down again without having the LCD fall out of the Monitor frame. Peel the foil Tape back on one end of the frame and using small pliers, unplug the 4 CCFL plugs (these go to the 4 lamps, I believe you have to remove the VGA and DVI connector Hex socket screws and screws around the power input. Carefully lift the back up and unplug the LCD, you'll have to remove the adhesive backed ribbon cable retainer. Set the LCD somewhere safe.The board with the 4 CCFL plug sockets is the Inverter board, unplug it fomr the Logic board, Remove the screws holfding it in as well as the 2 plastic clips (Squeeze these one at a tim with needle nosed pliers while gently lifting the board up.set the Monitor fram aside as you're going to focus on the inverter board. Using a LIGHTED magnifier, look for cold solderjoints, dull gray and pitted looking. One by one remove the solder with a desoldering braid (I mark the board with a sharpie pen to remember where all of the questionable joints are.) Using a fine tipped soldering pencil REMOVE the solder and replace with fresh rosin core solder. Be VERY careful not to disturb any of the surface mount components on the board. There are 2 large gray boxy looking capacitors with 2 transistors around each one. Check the solder connections there carefully on the capacitors. Look for signs of arcing, blackened spots or overheated circuit board. The 4 transistors in this area are (2S)C5706, replace them all, they're about a dollar apiece on EBAY, I would NOT recommend using a "SK or EGC Equivilent". Once the transistors are replaced, reassemble the monitor, up to the point of where you put the plastic case back on. with the monitor face up, plug in power and a signal cable form the computer and carefull press the power button on the Control board, the monitor should work. This is the most common fault with this monitor, if it doesn't work, go back and check all of the solder joints and resolder any you may have missed. Once the monitor works again, reassemble the plastics onto the frame, attach the base. I hope this helps, I can't promise this will resolve the issue every time, but it has in virtually every one of this model I've repaired. This repair helps the "no backlight or comes on then goes dark" problems. Randy L. Bray
Mar 29, 2009 |
HP Pavilion F1903 19" Flat Panel LCD...