Connected to a Hisense 322E29 LCD TV, boot white screen.
Disassemble the machine and go straight to the logic board. Once you check it, the power supply on the upper screen is burned and replaced with an insurance. You can’t rush to power it up, and then check it. One seems to be a boost diode (in fact, I don’t know what it is). The front end is short. [attach]506125[/attach]
Here, a lot of patch components are connected, and it is impossible to judge the short-circuit point. I take out the "burning chicken big method". Because I don't know the working voltage here, I can only control the "burning chicken" voltage below 1V (too high to burn the board.) I can't afford it, I don't believe that the working voltage here will be less than 1V.
Power on the "burning chicken", hand touch for a long time, did not touch which component has a warming phenomenon, can be sad and hateful, spend 70 yuan to buy not long before the infrared thermometer is not used a few times is also broken.
Do you give up like this?
Do you want to remove one by one?
Do you have to raise the "burning chicken" voltage?
Is it also to change the board repair?
Sample, the palace is known as "personality maintenance", has more than 30 years of flashlight maintenance experience, homemade "burning chicken Dafa" (first run out to blow the cattle B ah), do not believe will also be lost to a small logic board.
Take out the imported solder paste that I bought for 2 years and collect it for 2 years, and put a layer on the component that might be short-circuited.
[attach]506127[/attach]
Plug in and power on, the current is 1.6A when the voltage is adjusted to 0.8V.
[attach]506128[/attach]
Kanban, in just 10 seconds, the solder paste on the hidden deep destructive molecule is melting.
[attach]506129[/attach]
Remove the bad guy and measure that the short circuit no longer exists.
[attach]506130[/attach]
At this point, the board repair is over.
Haha, if there is no solder paste, even if your family's lard does not need money, don't apply lard to it. It is not bad to paint Vaseline or honey.
Dear readers, my 20 years of maintenance experience is like a lot of hair, will continue to deliver, so experience is useful to you, please raise your hands, you have money to hold a money field, no money you hold a personal field, I still wait for gold coins to buy Buy a house, thank you all the gods!
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