Sanyo LCD TV LCD-32CA320 image flash and horizontal line interference maintenance example - android - Phones Developers

I haven't posted for a long time, I feel very sorry for everyone, because I am busy, please forgive me.
A few days ago, a friend of Sanyo LCD was broken. The phenomenon of failure: booting, image flashing, flashing with horizontal line interference, sometimes the image becomes a single color, then the white screen, the sound has been normal.
Experience judgment, because the sound is always normal, there is a problem with the logic board circuit. The logic board of this machine is a small piece, as shown below:

Detect the logic board supply voltage, 12V is normal, suspect that the logic board is broken, and immediately Taobao.
After waiting for a few days, the shipment arrived and immediately replaced the logic board, thinking that the fault was eliminated. However, the reaction of the TV set gave me a cold breath - the fault remained.
Careful observation, when the image flickers, the sound is a bit "squeaky", the experience tells me that it should be the interference of the power supply.
Carpet type check each filter capacitor, no one abnormal, the idea is temporarily interrupted!
Ignite a cigarette and stare at the motherboard. It is estimated that the probability of a problem with the motherboard is higher. Suddenly I saw the shielded iron shell of the main board being rusty. I think that this TV set was seen by his parents. The old man’s room is damp. Is the circuit board leaking due to moisture?
Turn on the camera, the image flashes and flashes again. Ignore it, go online and play bubble cats. After about 30 minutes, the image miracle is normal! Shut down, wait a few minutes and then turn it on, the image will still flash. More than 20 minutes and magical normal!
Shut down and remove the motherboard decisively, wash it three times with anhydrous alcohol, the alcoholic water can not be said! Confirm clean, blow dry, cool air. The installation is turned on, and the beautiful images come into view! After cooling for more than an hour, everything is normal and the proof is correct. It seems that the logic board is up! Sorry, the logic board brother.
Summary: If you do not replace the logic board, you may not be able to judge the fault from the motherboard, and sometimes careful observation can also do more with less. I hope this case will help you, thank you for reading!