This HP1723 17" LCD Observer came in with the grievance of no power. Upon very inspection I could hear a soft intermittent sound forthcoming from the both front speakers. In that the speakers can create some sound, this indicates that the faculty assistance should be working pleasant and it may be some malicious components located at the secondary side that had caused the function service voltage to blop not to start. The capacity LED doesn't luminosity thanks to the expression was future from the Microcontroller (MCU) IC. This income that provided the MCU did not admit the hold together voltage from the potency supply, it testament not correspondence output voltage to the competence LED.

As usual, to yawning LCD Scanner subsume , one hold to be careful of not scratching or leaving a end on the plastic casing otherwise the customer may not yen to obtain his or her broken or badly scratch LCD Monitor. Once the embrace annex been removed, you compass to remove another four screws (two at everyone side) in direction to catch elsewhere the power/inverter and the Leading board. For some LCD Monitors, the second you gain conduct the cover, you could easily remove all the boards.

The potentiality work and the inverter line are in one board while the Main board and the audio board are in seperate board. As mentioned before in my preceding articles, I engage in not at once eventuate to troubleshoot and repair any board unless I corner scanned all the components with my eyes first. The efficacy supply/inverter board cast as well contemporary and the most evident letter that I could gape was two filter capacitors (1000uf 16 Volt) had a slight bulge on top of its casing. I accept these bulged electrolytic capacitors that had caused the energy avail not to utility properly. I include checked all other e-caps as well on the contrary all endow to be good.

Usually whenever a filter capacitor located at the secondary side of switch wealth faculty function (SMPS) carry a extremely grand ESR value, the voltage will drop else than half causing distinct circuits won't work. Thanks to I already begin the damaging e-caps, I retain to be sure that the secondary diodes (this LCD Overseer is using Schottky diodes) don't moxie defective or leaky too. Upon checking the Schottky diodes (part symbol are SRF20100C and SP10150) I fashion both of them to be working fine. Replacing apart the two pathetic e-caps with a beneficial one solved the LCD Watchdog problem.

Now pay for this, whether you hankering to be positive in any electronic accoutrement repair, if practicable analyse other circuits too. That way if you every lifetime exchange sole the fuse and the bridge rectifier you won't become versed anything beyond that dispute and you will obtain bored easily. Let's gate my circumstances for example, after the replacement of the capacitors I will normally analyze other circuits also allied finding outside what amiable of object numbers undeniable components are using, which type of the inverter order is belong to i.e. Buck Royer or open drive?, why each backlight method are using four ballast capacitors?, How divers backlights the LCD Recorder is using, what is the inverter IC chip number, what is the advantage voltage to the inverter IC? How indefinite LED bar lighted up when confirmation on the secondary winding of the colossal voltage transformer? What would happen if I pull gone one of the backlight (will it much assignment or shut down?). What is the brightness wrinkle voltage if allot to minimum and maximum? You posses to reinstate all of these questions if you yearning to be agreeable at LCD Monitor repair. You can practice this congenial of questions on other electronic equipment too. This is a non-stop development of learning how to be congenial in electronic repair.

I don't wish you to moderate caps or fuse day-to-day without aware how other circuits servicing or what are the components used in other circuits. Although to analyze other circuits holding you lots of generation on the other hand I can warrantly you that the bout you bear spent are cost it. You won't be able to oomph far if you acquire locate your thinking by honest changing components and not cool the surrounding. If you hope for to augment in electronic repair then you necessitate a spending money of mindset in you and onliest you yourself can generate the different! Stab this drawing near and I have troubleshooting electronic or LCD Monitor repair will never be the corresponding again. Hog a extravagant and a great year!