Jav1990

89

hace 5 años

What is the fault that the TV presents? Brand and model? Are all the voltages indicated on the connectors towards the main present? If the voltage varies try to follow the line of 12v and 24v that there is nothing abnormal possibly the main one is broken

ELECTRONICA CIENTIFICO

980

hace 5 años

friend jav1990..milias thanks for the help ... the brand is LG the nolo model I have. the back cover leave it somewhere else. The image I suv is the motherboard.
The fault of the TV is that it does not turn on. front light It turns on and off. and the voltages of 24v and 12v and the power on this fluctuate.
and in the 12v and 24v wiring I checked shorts and did not find any shorts. I will continue checking if I find any fault in that section.
Main Board Tv Lg 47la7400 | Eax64872105

Jav1990

89

hace 5 años

The fault then is that the standby LED flashes and does not give an image? Does the backlight turn on just bypassing the source? From what I see in the main there are sub-sources or regulators, there are 3 on the left side and one on the right side, each one corresponds to the gray coils along with some cynals if you can differentiate them, each of these sources delivers one of the voltages that you look at the connector, if you can detect which one of the voltages you are missing and measure components ... this is what I would do, the micro may also be failing

ELECTRONICA CIENTIFICO

980

hace 5 años

My jav1990..milias thanks for the help ... oy I do not use electricity and I laugh to bring the lid and the model is this model 42LA6600

ELECTRONICA CIENTIFICO

980

hace 5 años

friend jav1990..milias thanks for the help ... bridging the connector pins the screen lights up ok and when I take out the bridges and connect the main the screen is totally dark. Here is the diagram.
https://elektrotanya.com/lg_47la62xx-tx_chassis_lb33b.pdf/download.html#dl

Jav1990

89

hace 5 años

Do you have experience in this type of platelets? Disconnect the main from the source and check on the main input connector that there is no short between ground and positive, with all voltages do the same. Once this is done if there is no short, reconnect the main to the source, turn it on, and then check if the ps-on terminal drops to zero. That denotes if the mic is working. If this is not the case, check the main input connector, there must be a fuse, they are identified with the letter F, check that it has continuity

Jav1990

89

hace 5 años

You can also measure voltage after the fuse to see if it is good. After this you should check the sub-sources that are in the main, they are next to the gray coils one is identified as ZRC, near it there is a ci and components together. Sorry I can not give more accurate data try to open the file but I do not see the diagram of the main ..

ELECTRONICA CIENTIFICO

980

hace 5 años

friend jav1990.mil grasias ... I said what I said and commented.