How To Repair Dell 17" (Likom L705XXX) Monitor With No Power Symptom
This DELL 17” Monitor (Made in
Malaysia under LIKOM model L705XXX, product no: L7055LP) came in with no power symptom. Normally after opening up the cover I would look at the
power supply (primary side) for any burnt and cracked components first. If there are darkened area
and burnt components, I would tell myself that this Monitor needs a little more time to repair it. If it is not (component’s intact) I would
usually begin to discharge the filter capacitor and start checking the fuse.
Okay, it is confirmed that all the primary side components looks good in this Monitor.
First, discharge the big fat filter capacitor with a resistor (I know that the voltage already drained off but it is a normal
procedure for me because what if the start up resistor has an open circuit?) then check the fuse.
If the fuse is okay, experience will tell you that the bridge diodes are also working fine. Place your black probe of your analog
meter set to x1 to the center pin (drain) of the power FET and red probe to the other pin one at a time (gate and source). If the pointer
of the meter doesn’t kick then 80 % of the Power FET is okay. If you want to 100% confirm if it is good then you have to solder it out and
test. If the pointer shows a reading then most probably the power FET has developed a short circuit. The result that I got from this
Monitor was the pointer don’t flick.
Now is the time for me to use the dick smith flyback tester to check the smps primary winding. The result that I got was, the led
bar don’t lit. Ah ha! That was a clue and this clue tells you that it is either the smps primary winding is shorted or one of the secondary
diodes has given way. Of course you can check all the secondary diodes with your normal multimeter first (remember, every electronic
repairers have their own procedure methods of troubleshooting) but I prefer this way as I want to confirm also if the smps primary winding
is working or not.
Usually smps transformer is very robust thus I didn’t suspect it to pull down the flyback tester reading. I straight away check
all the secondary diodes with my analog meter and found one diode shorted (part number U202G). Since I do not have this part number, I use
a UF5404 ultra fast recovery diode as a replacement. In fact I use this UF5404 to all 14 to 17” Monitor as a replacement for all part
number of secondary diodes. The spec of this diode was 400volt, 3 Amp with 50 nanosecond.
After the replacement of the diode, and placing the flyback tester probes again to the primary winding, the result shows full bar
on the LED. Don’t be happy with the result yet because your job still hasn’t done.
Now I moved on to check HOT with the same procedure as checking the power FET. The HOT checked to be okay too. Next, I check the
internal capacitance of the flyback transformer to see it is shorted or not or is the capacitance value run. For your information, internal
capacitor in flyback transformer gave lots of problems in computer Monitor. I also scanned thru the B+ FET and found it to be good
Now is the time to switch on the Monitor, however this round I don’t connect any bulb because it was only a shorted diode in the
secondary side. I would only connect a light bulb after repair when there is major short circuit in the primary side such as a blown bridge
rectifier, shorted fet and smps primary winding and also burnt components in the board.
The DELL 17” Monitor worked beautifully and after long hours of burn-in test, I declared it okay and ready to send back to my
loyal customer. Isn’t it fun to be able to repair a Monitor and at the end you get paid for something you like doing. I just love