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LCD TVs - LED
Lg 42 ld650 I ask for help
195
hace 5 años
hace 5 años
Friends, this device turns on perfectly for 15 seconds and turns off, leaving the LED flashing in red. I suspect that it is protected since the lamps never turn on. The issue is that in the subject of inverter I have no experience of how to measure and where to realize if it is the oscillator or some lamp. The main one is not the problem since it was tested. Attached images of the source. 
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2.352
hace 5 años
You say it turns on perfect and then goes off ... but the LEDs don't turn on: Then it doesn't turn on perfect, can you explain yourself better?
2.352
hace 5 años
Lamps. You need to check the lamps first. Then verify the inverter, but without knowing that the lamps are working correctly you cannot verify the inverter.
2.352
hace 5 años
For that very reason. If they do not turn on the first thing is to check them. The voltage may be reaching them but if a lamp fails the source shuts down.
6.567
hace 5 años
Good morning, these TVs fail a lot in the welds, check the cable and connector that connects the main with the source, it is a classic fault, you turn on the TV and then it turns off that is to say the blue LED is on, it is red and for more that you give power does not want to turn on, the fault is more at the source, verify that the lamps turn on, it is not well understood by saying that it turns everything on and then goes off, and then you say that the lamps never turn on, if you already said that at the beginning it lights everything well, to say never is that from the beginning they do not light at all.
2.352
hace 5 años
The most tedious thing is to check the lamps without disassembling them. A tester that exists in the market or "manufacture" one is required. In youtube there are some examples of how to check the lamps. Otherwise, no matter how much the inverter is "good" it will not work and will send information to the source to protect itself and will never turn on.
195
hace 5 años
I explain myself well again.The TV turns on, either audio, it changes channels but the lamps never turned on, so I suppose that by not turning on the lamps it turns off, it is protected.The source has all the voltages well.The main board was tested on another tv and it works well.
6.567
hace 5 años
The only thing you have left is to discard the source module, possibly there is the fault, it is very difficult for the blooming to be misled to put it that way.
2.352
hace 5 años
In YouTube there is a method to check the oscillator. A capacitor and a neon bulb are used. If the oscillator works, the light turns on, even for a few seconds. But if not, the defect is in this or an associated component. Greetings and luck.
22.858
hace 5 años
hace 5 años
I must first check that the source generates all the voltages marked in the serigraphy, and that this reaches the pulse of the main inv-on this to activate the source of the lamps. Comment the source part number to upload the diagram.
2.372
hace 5 años
hace 5 años
Friend disconnects the main, make a bridge with a resistance of 1-47 ohm between stby and put pdim, the source must start even turn on the lamps, if they do not turn on, verify that the inverter is reaching voltage, verify that the inverter's drinks are not are cut in its secondary, check the lamp connectors are not dirty or sulphated, finally change optocoupler that gives the signal to start the power supply, if all ok, try to eliminate the protection in the integrated control, you can say the number to explain how to do it, if they still do not turn on, there is nothing left but to lift the display and change the lamps. Comment on progress to continue helping. Greetings and luck
2.372
hace 5 años
In this integrated protection is removed by pulling a 10 K resistor between pin 13 and gnd
2.372
hace 5 años
If you put the resistance as I explained and only the lamps do not turn on it is because they are bad, you have no other option but to replace them, you can also adapt LED, just put a power supply for them. Regards
195
hace 5 años
I have doubts ... if a lamp is wrong does not turn on any or would have to appear some light on them ...? and another thing ... let's see if I do it right ... with the R of 10k I put a tip on the leg 13 of the oscillator and the other on GND of the plate .... when I take out the protection it warms up the oscillator
2.372
hace 5 años
Friend that depends on the circuit that the inverter has, and if how you are doing is fine to eliminate protection.
195
hace 5 años
I have no doubt ... if a lamp is wrong does not turn on any or would have to appear some light on them ...? and another thing ... let's see if I do it right ... with the R of 10k I put a tip on the leg 13 of the oscillator and the other on GND of the plate .... when I take out the protection it warms up the oscillator
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