Hi,
I am trying to repair a sceptre x20g naga iii lcd monitor. I am testing the ccfl bulbs using another monitor as the power source.
Note: To test bulbs what i do is take another known good monitor. Disconnect one of the wires going to one of the ccfl lamps. I take the voltage coming from the "good" monitor and instead of running it to the good ccfl lamps i run it to the ccfl lamps i am trying to test. What i look for once i turn on the known good monitor is if the "no video connection" dialog box stays on the screen. If it does the lamp is good.....if it does not the lamp is bad.
Ok, so i opened up the Sceptre X20G and there are 6 wires going to the ccfl lamps (see enclosed pic). Before i opened it up......and this may be important ......screen appears as if the lamps come on for a few seconds....sometimes a little longer. Picture looks good. So i know that at least some of the bulbs are working.
I think on an earlier post i red that the "larger" diamter wire is the hot and smaller diameter wire is not the hot. Ok, from the pic you can see that the connector with the "white and white" has a larger and smaller diameter wire. So when i test this..........i get that the lamp is ok. When i move on to the other wires i get an interesting result.
In the other connector there are "pink-lightblue" and "black-darkerblue". I hope no one is color blind. Ok....when i test the pink-lightblue combination i put the "hot" wire to the "pink" and the "not-hot" to the "lightblue". The "no video connection" dialog box only comes on for a second. This tells me the lamp is bad. I did the same thing for the "black-darkerblue" with the hot going to the darkerblue. Same result......bad. The problem is that i am not sure i believe it.
When i test the top bulbs i get the same exact response. The white-white, good, the pink-lightblue bad, black-darkerblue bad. So i am thinking that i am measuring the white-white connection ok on the top and bottom bulbs but when i measure the "pink-lightblue" and "black-darkerblue" bulbs perhaps i am doing something wrong.
I am having a hard time believing that 4 ccfl bulbs are bad when i initially got a good picture for several seconds. And the bulbs that are bad are the ones in the 5-pin connector.........i have this feeling that i am either measuring wrong or making a wrong assumption.
I hope i have not confused anyone.........does anyone have any suggestions or thoughts?
I am trying to repair a sceptre x20g naga iii lcd monitor. I am testing the ccfl bulbs using another monitor as the power source.
Note: To test bulbs what i do is take another known good monitor. Disconnect one of the wires going to one of the ccfl lamps. I take the voltage coming from the "good" monitor and instead of running it to the good ccfl lamps i run it to the ccfl lamps i am trying to test. What i look for once i turn on the known good monitor is if the "no video connection" dialog box stays on the screen. If it does the lamp is good.....if it does not the lamp is bad.
Ok, so i opened up the Sceptre X20G and there are 6 wires going to the ccfl lamps (see enclosed pic). Before i opened it up......and this may be important ......screen appears as if the lamps come on for a few seconds....sometimes a little longer. Picture looks good. So i know that at least some of the bulbs are working.
I think on an earlier post i red that the "larger" diamter wire is the hot and smaller diameter wire is not the hot. Ok, from the pic you can see that the connector with the "white and white" has a larger and smaller diameter wire. So when i test this..........i get that the lamp is ok. When i move on to the other wires i get an interesting result.
In the other connector there are "pink-lightblue" and "black-darkerblue". I hope no one is color blind. Ok....when i test the pink-lightblue combination i put the "hot" wire to the "pink" and the "not-hot" to the "lightblue". The "no video connection" dialog box only comes on for a second. This tells me the lamp is bad. I did the same thing for the "black-darkerblue" with the hot going to the darkerblue. Same result......bad. The problem is that i am not sure i believe it.
When i test the top bulbs i get the same exact response. The white-white, good, the pink-lightblue bad, black-darkerblue bad. So i am thinking that i am measuring the white-white connection ok on the top and bottom bulbs but when i measure the "pink-lightblue" and "black-darkerblue" bulbs perhaps i am doing something wrong.
I am having a hard time believing that 4 ccfl bulbs are bad when i initially got a good picture for several seconds. And the bulbs that are bad are the ones in the 5-pin connector.........i have this feeling that i am either measuring wrong or making a wrong assumption.
I hope i have not confused anyone.........does anyone have any suggestions or thoughts?
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