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This DELL 17 “Monitor (Manufactured in Malaysia beneath LIKOM product L705XXX, item no: L7055LP) arrived in with no power symptom. If there are darkened place and burnt components, I would convey to myself that this Monitor requirements a little much more time to restore it.
Alright, it is confirmed that all the key facet components appears to be like good in this Monitor.
To start with, discharge the major fat filter capacitor with a resistor (I know that the voltage previously drained off but it is a usual process for me for the reason that what if the commence up resistor has an open circuit?) Then test the fuse.
If the fuse is alright, practical experience will inform you that the bridge diodes are also functioning great. Place your black probe of your analog meter set to x1 to the heart pin (drain) of the energy FET and red probe to the other pin a person at a time (gate and source). If the pointer of the meter does not kick then 80% of the Electricity FET is okay. If you want to 100% affirm if it is very good then you have to bought it out and examination. If the pointer demonstrates a looking through then most possibly the electricity FET has produced a small circuit. The result that I got from this Monitor was the pointer do not flick.
Now is the time for me to use the dick smith flyback tester to look at the smps primary winding. The end result that I got was, the led bar do not lit. Ah ha! That was a clue and this clue tells you that it is possibly the smps most important winding is shorted or just one of the secondary diodes has given way. Of program you can check out all the secondary diodes with your normal multimeter 1st (keep in mind, each digital repairers have their own treatment strategies of troubleshooting) but I favor this way as I want to verify also if the smps primary winding is working or not.
Commonly smps transformer is incredibly strong so I did not suspect it to pull down the flyback tester reading through. I straight away verify all the secondary diodes with my analog meter and found a single diode shorted (component number U202G). Given that I do not have this section number, I use a UF5404 ultra rapid restoration diode as a substitute. In fact I use this UF5404 to all 14 to 17 “Monitor as a substitute for all element range of secondary diodes. The spec of this diode was 400volt, 3 Amp with 50 nanosecond.
Soon after the substitution of the diode, and inserting the flyback tester probes yet again to the main winding, the result reveals entire bar on the LED. Do not be happy with the result however mainly because your position even now has not done.
Now I moved on to check Incredibly hot with the very same method as examining the ability FET. The Scorching checked to be all right as well. Next, I check out the inside capacitance of the flyback transformer to see it is shorted or not or is the capacitance value run. For your information and facts, interior capacitor in flyback transformer cave blocks of challenges in computer system Monitor. I also scanned by way of the B + FET and identified it to be good way too.
Now is the time to change on the Monitor, even so this spherical I do not hook up any bulb mainly because it was only a shorted diode in the secondary aspect. I would only link a mild bulb soon after mend when there is major short circuit in the most important facet such as a blown bridge rectifier, short fet and smps key winding and also burnt elements in the board.
The DELL 17 “Monitor worked superbly and just after lengthy hrs of melt away-in check, I declared it okay and all set to mail back again to my faithful buyer. for something you like performing. I just adore digital maintenance!
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