Skyworth LCD TV LED46E70RD indication is not bright, sometimes can be turned on - android - Phones Developers

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Skyworth LCD TV LED46E70RD indicator does not light, sometimes can be turned on, look at the screen speaker murmur check. The previous two days repaired a Skyworth LED46E70RD, to the user's home power observation light is not bright, open cover test 380V normal, 24V normal, 12V normal, 5V normal, STB high level, P-ON / OF voltage is not, unplug The screen line is turned on again, the blue light is on, the backlight is on, the background music is coming, the heart is sneaked, and the shutdown is reported to the user that the logic circuit is not normal (just say), the quotation *** user agrees, the processing screen line is plugged in. Booted for more than half an hour without any abnormal cover and cashier.
Yesterday afternoon, I just fell asleep and heard the phone ringing. I said that the TV is not working. I still look at the scene. It is exactly the same as the original. The voltage of the disassemble is the same as the original. The 5V, 3.3V, 2.5V and 1.8V on the main board are normal. After plugging and unplugging the screen line, it is normal again. This doesn't make me play it. I repeatedly found that the screen is off when the screen is turned on. The blue light is still on and off. It seems that the motherboard is broken, but Why is the backlight turned off? Is it because the light strip is broken? Is the power board open and soldered? Remove the power board and check the solder joints. No problem is found. Or focus again on the motherboard and press the motherboard. The main chip is booting, no, it is still the same, but found that it is very hot, repeatedly switch on and off, can press the main chip after the normal boot, the speaker wow wow like the old TV TV no noise, the TV sounds after the screen, the black screen, the problem is found Yes, I have to discuss with the user to add money to change the board, the user agrees, but I have always been kind and honest, telling the user that since you all agree to change the board, then I will give you the first repair. If you fix it, you don’t have to spend more than one motherboard. Is it money? The user is very good at talking about repairing it. If you can't fix it, you can't change it. You can't change the TV. This big sister is really refreshing. Immediately screw two screws to get on the bus and go home!
Start on the picture below


First use a heat gun to heat the heat sink on the chip for a few minutes. It doesn't need to be too hot. It can be done within 280 degrees. After heating, the heat sink will be lowered with the tail of the tweezers. Then the edge of the chip is cut with a scalpel. Drop, do not wash, cover the small parts around the chip with aluminum foil

Because there are many small parts on the bottom of the motherboard, the same cover

BGA solder paste is blown into the bottom of the chip with a heat gun

Matching on the machine

Start heating, heat to a slight smoke, continue to use solder to add solder paste to the bottom of the chip


Continue to heat, keep it after 240 degrees, gently touch the chip with tweezers, and continue to add solder paste until the tweezers touch the chip.

After shutting down and cooling, remove the motherboard, continuously smash the machine for several hours, press the chip repeatedly without any abnormality, and the repair is over!