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The grievance for this DELL E152Fpb Lcd Monitor was when switched on has electrical power (LED lit) but no display screen. Liquid crystal display Monitor is distinctive from the CRT Monitor where you could really feel the static at the entrance of the picture tube or hear the hurrying audio from the substantial voltage produced by the flyback transformer. In Liquid crystal display, if no screen you will never be in a position to know if the inverter board is functioning or not except if you use an oscilloscope to issue near the inverter board and the scope could show a waveform indicating the inverter board is working.
A defective main board may possibly lead to no display screen dilemma in Lcd Monitor. If there is a problem in the main board, it would not mail a “on” (empower) sign to the soft get started circuit and no voltage will circulation to the inverter IC therefore no waveform create by the higher voltage transformer.
In the earlier mentioned scenario, following the deal with was eliminated, the initial thing I test was the vcc (source voltage) to the inverter IC. This product is applying the famous TL1451ACN Pulse width modulation (PWM) IC-some favored to phone it as inverter IC. Pin 9 is the VCC supply enter and it ought to have about 12 Volts when the ability is “on”. Measuring the pin with my devoted digital multimeter, it reads only about 3 volts which implies there is a problem in the source line. It could be elements that are faulty that dragged down the line or it could be the swap manner electrical power source itself that do not develop adequate ability.
In get to uncover the respond to as which part is providing trouble, the 1st clue was that the electrical power LED indicator lit and this prove that the IC is supplying adequate ability to the circuit. Yet another clue was that the meter is registering about 16 volts at the input of the 2A fuse. Simply because of these obvious solutions, we can conclude that the change manner power source is doing the job great. You can also use a 12 volt gentle bulb to validate it. You may well examine my other article on Lcd Monitor repair articles or blog posts which talks about making use of 12 volt gentle bulb for troubleshooting needs.
I kept on asking myself, why the voltage fall to 3 volts immediately after the fuse. Just before the fuse it reads about 16 volt but soon after the fuse it reads only 3 volts! I didn’t suspect the fuse, for the reason that the fuse can only both indeed or no and no in in between. The 1st circuit that I checked was the start circuit but all parts checked to be okay. I even desoldered the pin 9 of TL1451ACN inverter IC just to make absolutely sure it is not this IC that pulled down the voltage.
This challenge really troubles my troubleshooting and fixing talent, because virtually all suspected elements by now checked to be doing the job. Even the start off circuit transistors (C945 & A733) I direct replaced, frightened they would breakdown when under load. The only part that I didn’t check out was the fuse! By making use of my meter put across the fuse, as an alternative of receiving very low ohms or zero ohm examining I bought 1.012 Kilo ohms! I’ve bought a stunned and will not believe that that a fuse can actually go into substantial ohms as an alternative of open up circuit. I usually imagined that a fuse is either shut or open circuit. A fuse with zero ohms turned into higher ohm therefore the 16 volts dropped to 3 volts! I have arrived across loads of this kind of fuse but this is the 1st time a fuse modified into substantial resistance.
Replacing the fuse only set the DELL E152Fpb Lcd Monitor again to existence. The lesson acquired from below is that really don’t think that a component is usually in a very good operating affliction. You have to confirm it with your meter and if you still suspect the component is offering issue, only switch it with a identified good just one and retest the equipment. Semiconductors can breakdown when beneath whole operating voltage.
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