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LCD TVs - LED

LCD TV Philips Model 39PFG4109 / 77 Dark Screen with Sound

Ruddy Chaile PC
hace 5 años
hace 5 años
Hello friends of me, I do not have much experience in LCD, I arrive at my workshop today with the following failure to turn it on, it leaves an image on it says philips for a few seconds and the LEDs turn off leaving only tuning sound check the LEDs all turn on then turn off, take output voltages of source board has on leg 13 and 14 the 12v, leg 11 and 12 the 12v, leg 9 and 10 the 12v audio, leg 7,8,6,5 gnd. leg 3 and 4 2v my question is if I have a problem with the inverter, what voltage should I take please help, someone could love me.
TobíasTv
TobíasTv
13.721
hace 5 años

I measured between led + and ground, if you have about 24 volts ... bad

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TobíasTv
TobíasTv
13.721
hace 5 años
hace 5 años
Hi Rudy, that TV burns the LEDs on the screen, and not one, it has 6 series of LEDs on three bars, all in parallel, it feeds with 18 volts but it factory manufactures a lot of tension and burns them all ... When you change them you will have to modify the font so that it does not happen again, post and tell you how I change the 18 leds and I put 6-volt lg leds, the polarity is reversed but as I change them all I turn the power in the bar connector Tobias greetings
Ruddy Chaile PC
hace 5 años

Hi tobiastv you have reason kapo prove voltage in + of led and mass as you said, without giving power it has 11.9 v when pulse power goes up to 27v which is when it turns on and off it goes down the voltage to 11.9v. 3 strips. I did not understand the polarity reversed well. I do not have the LEDs on hand I will have to travel to the city one of these days of the week possibly on Wednesday the LEDs have to be 6 v?

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TobíasTv
TobíasTv
13.721
hace 5 años

Hello, I change all the LEDs and modify the source, if you want you can put new strips, modify the source and forget
I show you a case of source modification so we advance, any doubt here I am
.
https://yoreparo.com/tv/televisores/lcd/preguntas/1591017/backlight-philips-39pfg4109
.
I will have the good vibes of adding that you are before the finest display that manipulates, thinks and is very delicate, breaks from nothing
luck

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TobíasTv
TobíasTv
13.721
hace 5 años

yes, leds 6 volts 2 watts, if you dare change them all

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Ruddy Chaile PC
hace 5 años

Thanks tobiastv a good contribution it is always good to find people as a voice that give you their connoisseurs I buy the LEDs if I get them in the electronic stores because they were on vacation and if it is the very finite display and I will be careful, I tell you when
perform

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Ruddy Chaile PC
hace 5 años

sorry I tell you when I make the changes of LEDs a big abrasive and again thank you infinite thanks

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TobíasTv
TobíasTv
13.721
hace 5 años

give it, my luck goes and I hope yours;)

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Ruddy Chaile PC
hace 5 años

Hello tobiastv sorry for the delay, I tell you that two of the 6 led bars were burned 3 LEDs in each bar, a single bar lit all the LEDs, what I did is with a colleague is to change the three LEDs of each bar, I cost less than a new bar that cost me 650 pesos each bar, I put them on, 2 hours ago it's walking with image and sound, I also canceled the resistances at the source. I wouldn't have fixed it without your help, thanks to voice and everyone from the forum community, a hug and a handshake at a distance.

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TobíasTv
TobíasTv
13.721
hace 5 años

I congratulate you, greetings and see you next time :)

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