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There are many cause of dark picture symptom of standard television.First thing to do is try to adjust the screen control adjustment located at the flyback at the lower parts.There are two flyback adjustment the focus and screen adjustment.The upper level is focus and the lower is screen control.
If check also the CRT socket board section.This CRT board is compose of high voltage terminal coming from the high voltage supply.Check if there's a cold solder in CRT socket terminal and other parts around the CRT socket.The heater supply,the RGB cathode supply,and the screen supply are the supply of picture tube to be lights up.So try to resolder those parts of the TV.Avoid short circuit in the PCB board.Hope it will help you.Thanks..
Maybe the problem of your television is the screen back lights.The screen have no back lights.If theres is no back lights the problem is in the back lights driver or power supply.Usualy the common problem is loose connection at the socket of the cathode lights.The cathode lights have high voltage input come from the driver that my cause of over heat of connector.So try to resolder the connector or socket using soldering iron.It is located at the board of the television.Remove the back cover to see the board.
hi there.it sounds like the inverter board is faulty.its the pcb which lights up the cold cathode lamps behind the screen.readily available on ebay usually.relatively easy to fit yourself! (depending on the model,that is!!)regards,steve
Pink colour denotes the absence of green colour dispay in your picture tube. I hereby gies an approximate voltages at the three cathodes of your picture tube socket solderings, and you just measure the voltages with reference to this. The voltages are approximate, and can chage up to 2% up or down. Green Cathode = Pin number 9 [161VDC approx]; Blue Cathode = Pin number 8 [162VDC apprpx]; and Red cathode = Pin number 10 [157VDC approx]
If any of these voltage differes, the clolur related to that cahode will also rise or low, thath is if the cathode voltage goes very low, that clour will be prdominent, and if it goes high, that colour will not be there.
In your TVs case, the green cathode voltage now will be high. t may be due to a soldering loose to either to the picture tube base socket or at the terminals of the related transistor or Ic. It is best to resolder the suspected loose soldering points by applying a little more solder, as we in service field also do. It is very difficult to locate the exact loose soldering point and so I advice you to do so. If needs, replace the colour output transistors, of other devices if used. Just look at the voateg at pin number 9 at the picture tube base card. Resolder all the picture tube base socket pins. If you wants any more calrification, contact me through Fixya. Ok.
there is a problem on your inverter board and the cold cathode lamp.The inverter board is the supplying high voltage supply to the cold cathode lamp.This cold cathode lamp is the illuminating the screen in which the the picture will appear once cold cathode is lit.here is a link where you can buy the parts..
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the problem with tv is the cold cathode backlight you need to open the back cover of the monitor .resolder the terminals from the power supply of the cold cathode ..fit te socket.replace the cold cathode it not work...
change the backlight (cold cathode light) on your monitor.. If you are able to open the back of your lcd monitor carefully, the backlights are located at the upper and the lower part of the edge .. replace it with conventional cold cathode lights(protective tube was removed)... there are also instances that backlight was good but the ballast transformer is burnt. Replace the ballast. Its very cheap to replace that.
The ballast transformer of the cold cathode on your monitor is overheating.. Replace this..If the monitor is on and keeps on changing from white screen to black. The cold cathode light is almost up. Replace this one too.
check your fuses first These tv's have one or, two small fluoresent tubes called cold cathodes that light up your tv the power supply for these cold cathodes in known as an inverter it changes TV powersupply voltage to power these cathodes can use since both tubes went dark together I would check my inverter it is easiy to find as it is wired ti the cold cathodes