I update:
I had a LED cast, of the strips that illuminate, I will replace a 6 Volt SMD LED, for its size.
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LCD TVs - LED
LG 32LN580B Led TV with audio and no image (No backlight)
1.423
hace 5 años
hace 5 años
Good afternoon, I have a LG TV model LG Led TV 32LN580B with audio and no image.
Turn on very well, change channels and perform all functions, only defect ... that does not shine.
The 135 volts of the inverter are present, in the connector of the LED bars, I have LED + with 135 and LED- (Return) Without voltage connecting the negative tip of the multimeter to the chassis. This tells me that the inverter works and there is no protection against excess current or voltage in the inverter. Because I have the voltage present.
Has anyone seen it or had that inconvenience with that model?
Voltages were measured: 3.3 / 12/24/117 volts (135 reais) as indicated by the board.
I attach the Service manual if someone wishes. (I didn't find more detail, just technical data and how to program it)
TP500 = Test Point On Off is OK
And unfortunately the manual that I have for service, does not come with the diagram of the power source ... just a stupid tracking manual where it says "check naked eye if the backlight is fine" and then "Check power card "and if everything works" Replace T-With Board or Module "
Does anyone have the manual where the power source is?
I update:
I had a LED cast, of the strips that illuminate, I will replace a 6 Volt SMD LED, for its size.
I update:
I had a LED cast, of the strips that illuminate, I will replace a 6 Volt SMD LED, for its size.
1.423
hace 5 años
That's what I'm afraid of, the LED return - it doesn't return the 142 volts ... I think I'll have to check the LEDs
81
hace 5 años
A question if you touch the screen or display with your fingers giving a few light strokes lights around your fingers? on the other hand in the t-com there are several voltages that must be present are all found?
1.423
hace 5 años
Gilar ... I'll have to uncover the entire front panel, which scares me because of the glass or the flex ... Damn that scares
1.423
hace 5 años
Tecnlogo, No, I don't have how, I had a flashlight but I don't have it anymore and my cell does not have a flash with high power to know if it is backlit, I will have to uncover the front panel as I said to GILAR
81
hace 5 años
If it is the best test you can do is led by LED on each strip there is a part number if you look on the internet it will give you the voltage with which each LED works in lg and of several voltages from 3 volts dc to 6 volts in mi experience
1.423
hace 5 años
Teclonogo1, Thanks in effect If they were the LED Strips, I have disassembled them and found the LED STRIP that does not communicate, being in series, a damaged LED, did not give me continuity.
Thank you
6.594
hace 5 años
hace 5 años
[quote] a question if you touch the screen or display with your fingers by tapping lightly around your fingers? on the other hand in the t-com there are several voltages that must be present are all found?
To prevent the colleague " tecnologo1 " suggest you consult a pythoness do the following, without disassembling the screen disconnects led - (GND) to this same terminal you put a 10K resistor and send it to ground so you should turn on the lighting.
or arm the tester Francisco tells you [/quote]
81
hace 5 años
The first thing that is done is to discard the LEDs in the comments, she did not write that the bars or strips of LEDs were lit by logic, I supposed they would be fine and the problem would not be serious.
1.423
hace 5 años
Don't fight guys, I thank you both for your support: D
You are the best, 50 points go to each one worth?
1.423
hace 5 años
[b] And Gilar, it was not necessary to place the Resistance, I uncovered the back and found a molten LED! Now I am looking for the power and voltage to adapt one, because putting a DIODE to bypass it would make the screen of a corner opaque. [/b]
1.423
hace 5 años
[b] Gilar ... A query, how to know the voltage and Watt of that LED? I only see the code "1413 LG" the TV is 32 and I don't want to buy a new Strip, just replace the LED ...
Will you know how? [/B]
6.594
hace 5 años
Well, the catalog number for this LED according to LG INOTEK is LEMWH51x80 Series, but for practical purposes it is a 6.5 volt led at 1 watt, in fact according to its internal diagram it is a 3 volt led associated with an internal zener and both working as a circuit, turn on the LED with 6 volts. 6 volt led conclusion to 1 watt cold white.
In this link you will find a tutorial
https://www.yoreparo.com/tv/televisores/lcd/led/preguntas/1545768/esquematico-fuente-lg-32lb580b-lamparas-no-enciende
81
hace 5 años
the maradona of the forum has already left greetings victor never always brings criticism and in the post the first thing he writes is that the 135 volts of the LEDs are present and if they do not fall down it is assumed that the LEDs are fine in order is a matter of understanding or not and as always victor contributing in positive and solving everything
6.594
hace 5 años
Tecnologo1 Cito "The first thing he writes is that the 135 volts of the LEDs are present and if they do not fall down it is assumed that the LEDs are fine in order to understand or not.
Your argument is very ambiguous but with two dynamic tests it is easy to understand.
* First test * as explained by "enigmahernandez"
* Second test * The tips of the multimeter are placed to the socket of led +, led -, and readings are taken, here you will observe that the voltage begins to fall since if you have an open LED the protection is activated by downloading the stored energy in the filter.it all ... greetings
22.858
hace 5 años
hace 5 años
assemble this tester to see if the LEDs light up without the need to disassemble the TV, they are easy components to get and almost all of them are in the bone, if you put the tips of the multimeter it also marks the consumption of the LEDs, if they do not mark consumption they are LEDs open.
1.423
hace 5 años
To know the consumption of LEDs, did you know that it should be put in series with this circuit?
22.858
hace 5 años
if there are only two cables if disconnected from the source or not. Then one in the negative cable and the other in the positive one, I have to mark a consumption very close to 117v as the source marks it, and it should be seen that the LEDs light up, if there is no consumption it will mark you 170v, you can try all the strips together, a single strip or a single LED and in all cases will mark the consumption, from 3v if it is a single led. this only if your electrical network is 120v since if it is 220 the circuit used is another, this is only for 120v.
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