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Re: lost panel light
It is not 1 bulb but a series of long cold cathode bulbs with mercury vapor inside. If any one fails, they all go out. If the inverter fails, they all go out. Don't open the panel. Lamps can be tested in the panel by someone who knows how. Very high voltages also. Safer to take it to a shop.
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start by checking the power at the mains terminal, then check the continuity of the power input cable. if its healthy then confirm that all fuse in the cable plug is ok.remove the cover and check on the switch mode power supply.conduct a visual inspection to acertain any blown component like the fuse, swollen filter capacitor, the burnt resistors and diodes. if they do not seem to appear phisically burnt then conduct a meeasuring test with a multimeter.
replace any faulty component and test the television by opening the power input fuse and connecting a 100w bulb in series and feed in the power. if the tv oscillates and the bulb lights up then gets dim gradually then the tv is working hence you can now remove the series test bulb and place back the fuse and connect all the cables in place and feed in the power and you see your tv lighting up
Good day sir try to check first the power supply. The power supply of your tv is already faulty, try to remove the back cover of your tv then look for bulge up or leaky capacitor this capacitor produces low and unfiltered dc output that causes your unit to malfunction until the capacitor are holding enough power to bring the current up over the threshold point and power on the tv. But be sure to unplug the tv before removing the back cover of your unit and capacitor is much cheaper than the main board of your unit, just let me know if you want to do it I will guide you. Best regards.
could be a problem in the inverter board and the backlight lamp of the
monitor . The lamp is a cold cathode bulb it requires a high voltage
supply from the inverter board in order to light up. Like any other
bulb this lamp has a limited life span more or less 2 years of
continues lit. The inverter board is a high voltage board the power
input of this board is 24volts DC and the output is 200volts AC.The
terminal input of this board or connectors must be check because of
high voltage Corrosion and loose connections always happen that leads
to the mal function of the display or screen failure just like what
happen to your TV. Backlight lamp is installed at the top and
bottom of the screen you need to open the back cover of your TV to
check up the lamp.(make sure to unplug the TV before proceeding)
The solution from bjwjb posted on Dec 30, 2009 is absolutely correct:"There is a piece on the bulb cover panel that you take off in order to change the bulb that fits down inside the bulb assembly when you put the panel back on. The bulb cover panel and the part of the panel that goes down into the bulb assembly must be present or the projector will not power up (there will be no lights either)." I would add to that once the cover is placed back, but before the screws of the bulb cover are tightened, firm pressure should be place on on the bulb cover panel on the spot placed where the plastic protrusion (a plastic "stick" about 1.5 inches long that fits into a void in the bulb assembly) goes into the bulb assembly. You should/may hear a "click", indicating that the protruding plastic piece has been fully inserted into the bulb assembly and makes contact with whatever contraption is inside the assembly to enable power-up. If no pressure is exerted the plastic protusion may not extend down far enough to make contact to enable power-up. In such case the bulb cover panel may be slightly bulging in the location of the protrusion. You would still be able to tighten the bulb cover panel screws, because the plastic is flexible. In such case you may find that the screw closest to the location of the plastic protrusion may need pushed in more. In this condition, even though you may think the cover is properly placed, the plastic protrusion is not fully inserted and does not make contact and there are no lights or power. Just take of the bulb cover panel place it back following the instructions above.
I had already disassembled my projector and was ready to bring it in for service when I did an internet search and saw the advice from bjwjb. Thanks very much!
I replaced the bulb recently on my tv and did not push the bulb all the way in. I had the same issue you are having now, and I was able to get it to work when I realized it had not been installed properly. Make sure you push the bulb in all the way then push down on it so it sets in nice and snug. Sounds like someone replaced the bulb and installed it wrong like I did the first time. Good luck.