Connected to a Hisense 322E29 LCD TV, the screen shows a white boot. I decided to disassemble the unit and directly access the logic board. Upon inspection, I noticed that the power supply on the upper part of the screen was burned out and had been replaced with a fuse. I didn’t rush to power it up again; instead, I started checking step by step. One component looked like a boost diode, but honestly, I wasn’t sure what it actually was. The front end was shorted. [attach]506125[/attach]
There were a lot of patch components connected, making it difficult to pinpoint the exact short-circuit location. So I decided to use my "burning chicken" method. Since I wasn't sure about the working voltage here, I kept the "burning chicken" voltage below 1V (too high might damage the board). I couldn’t afford to risk it, but I also didn’t believe the working voltage would be less than 1V.
I powered on the "burning chicken" and touched each component for a long time. None of them felt warm, which was frustrating. I even spent 70 yuan on an infrared thermometer not long ago, but it’s only been used a few times and already broke.
Should I give up now?
Should I remove components one by one?
Should I increase the "burning chicken" voltage?
Or should I just replace the entire board?
You know, in the repair world, they call this "personality maintenance." I’ve been fixing flashlights for over 30 years, and I’ve even developed my own "burning chicken Dafa" (first run out to blow the bull B ah). I don’t believe I’d lose to a small logic board.
I took out the imported solder paste I bought two years ago and had been collecting for two years. I applied a thin layer on the components that might be shorted. [attach]506127[/attach]
Then I plugged it in and adjusted the voltage to 0.8V. The current was 1.6A. [attach]506128[/attach]
After just 10 seconds, the hidden destructive molecules under the solder paste began to melt. [attach]506129[/attach]
I removed the faulty component and tested again — the short circuit was gone. [attach]506130[/attach]
At this point, the repair was complete.
Haha, if there's no solder paste, even if your family’s lard doesn’t cost money, don’t try to apply lard. It’s not bad to use Vaseline or honey either.
Dear readers, my 20 years of maintenance experience is like a lot of hair — plenty to share. I’ll keep delivering practical tips, and I hope these experiences are useful to you. Please raise your hands — if you have money, support me with a donation. If not, just spread the word. I’m still waiting for gold coins to buy a house. Thank you all, and may God bless you!
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