My LG TV 55lv5500 suddenly turn black with no sound or picture.
My TV turn black with no sound or picture. The power light is on. I openness the back cover and it seems all capacitor are in working order. Do I need to replace the BU board or power supply
Questa è una buona domanda?
Have the same TV....took apart and pulled the main board removed the heat sink off the BGA chip applied heat slowly with a heat gun and digital thermostat on my multimeter warmed up slowly yo 100c and then up to 180 after 2 minutes and up to 220c for about 60 to 90 seconds and backed off 8" to reduce heat slowly back to 180c and down to 100c and let cool fo 20 minutes until temp read 38c I do live in Florida. Reinstalled the oars added power and sure enough powered right up. Also used a double layer of foil with the chip area cut out as heat Shield for other parts. Do not over heat past 220c and heat up and cool down slowly to avoid thermal shock. Make sure your power supply is working.
Chianti, how did you remove the heat sink from the bga chip? I don't know how to remove those plastic pins without breaking them. (maybe my setup is slightly different as I have the 47lv5500)
da b eid
@chianti19881, this procedure worked for me, too. I have a 47lv5500. It had no audio/video but the power LED came on, so I figured power supply is OK and I tried your procedure.
Took the motherboard out of the TV. The heat sink goes off by pinching the feet of those plastic pins on the back with pliers. Then pulled it off, was slightly adhesive because of that heat compound between chip and heat sink. In the end, I just put the heat sink back onto the motherboard.
I used a Makita heat gun and a cheap, analog oven thermometer. I ramped up heat slowly, then held it for about 90sec at about 400F, then cooled it down slowly to 100F and let it sit for a while. Total procedure time 10minutes. Hope this helps somebody else, too!
I had the same problem thanks for this solution.
I heated the CPU up with my hot air solder station to 220C for 5 minutes.
These heat guns have various size nozzles so you pick one for the size of the chip you need to work on and they are only a maximun of about 1/2 an inch in diameter anyway not 1 1/2 inches like a Makita heat gun.
I did not bother with a heat shield the chip is pretty much on its own. I was more worried about the chips underneath falling off.
Went to the shop and when I came back reassembled and all working.
Obviously a problem with this series of TV's.
da Mark Symons
I finally made time to try this solution. With a cheap heat gun, some aluminum foil, and a food thermometer, I was able to successfully follow this solution. It worked for me on my 47LV5500. We'll see how long it lasts.
da b eid
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