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TVs

TV Lg32ln540b with audio and no image

Jav1990
Jav1990
Jav1990
89
hace 5 años
hace 5 años
Good evening gentlemen, I am an electronic technician and I am introducing myself in the repairs of led tv, I would like to consult for a fault in the lg32ln540b tv which turns on with audio and without image. Lighting with a flashlight you can see a very weak background image so I think the fault may be in the backlight or in the power circuit of the same. The voltage measured during the ignition is in the led + line of 133v with respect to chassis ground, but varies to 127v over and over again, while in the return it has the same behavior but goes from 70 to 65v. In standby I have a 50v reading. On the card it says that the output (I am not sure if it is in the back light) should be 71.3v but it does not match any voltage that has been measured. If anyone can give me any input I would greatly appreciate it as it would help me expedite future repairs. Best regards good night
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Victor E
Victor E
Victor E
65.783
hace 5 años
hace 5 años
You have burned or short LEDs. You must disassemble the TV and remove the display panel very carefully and replace the bad LEDs with others of the same type. greetings
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Jav1990
Jav1990
Jav1990
89
hace 5 años

Good afternoon thanks for your attention, I have a led strip of a tv with the glass broken into a thousand pieces is a noblex 32 "I do not remember the model would have to see if they share characteristics .. looking for information I saw that this small variation can cause a capacitor electeolitico at the exit before disarming everything I will check that and then comment thank you greetings

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Victor E
Victor E
Victor E
65.783
hace 5 años

From experience I tell you that in this TV model the failure of the LEDs are very common. There is no capacitor that is worth it, although IN youtube says that it is a capacitor.

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Jav1990
Jav1990
Jav1990
89
hace 5 años

Well great then .. I just thought it could be a source failure because the variation is made with and without the backlight connected .. a question that may be totally ignorant but the LEDs that come in the lamps for domestic use are useful for these cases?

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Victor E
Victor E
Victor E
65.783
hace 5 años

No, those who carry these are 3 volts 1 watt code 3528.

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Jav1990
Jav1990
Jav1990
89
hace 5 años

I was right just to replace the led with a 6v with a parallel resistor to balance the brightness together with the other LEDs ... so far I have it in test I hope it lasts considerably repair thanks greetings

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Jaramillo
hace 5 años
hace 5 años
That's right friend ... once the damaged led is located you can replace it with a 470 ohms resistor in case you don't have the led .. It has worked for me. Greetings and comments ????
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Jav1990
Jav1990
Jav1990
89
hace 5 años

Thank you for the answer I have a panel of obsolete noblex I will check that the circuit is in order before disarming I still could not do it because I had to continue with another activity as soon as I get results as regards greetings!

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Jav1990
Jav1990
Jav1990
89
hace 5 años

Here I found the led burned. It has 2 strips of 7 and one of 8 leds .. they are 3 v I only have 6 v will do something? Or with the r it will be enough

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Jav1990
Jav1990
Jav1990
89
hace 5 años

Since I had no r of 470 I put 560 ohms and now the back light turns on and off constantly

Responder
Jaramillo
hace 5 años

Ok brother place a 2.2 honm and monitor the temperature. You tell me how it works ...

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