I haven't shared anything with you for a long time, and the show feels very sorry for the brethren. Because of my busy work, I am here to say to everyone: "Uncle understanding!" The show will always support the forum, always love our forum, and always miss the brethren! Apply Feng Gong a sentence: "I want to die you!"
All right! Gossip, let's share with you the strange fault of a Skyworth TV repaired for friends during the National Day:
Model: Skyworth 34T86HT
Symptom: one: sometimes black screen (with normal sound)
Tow: not remote control (remote control function is disabled, remote control is normal)
Maintenance ideas:
1. Repair the black screen fault first. According to the fault, first check the ABL circuit----turn on the power supply, when the black screen is waited, observe the filament is bright, the SCREEN voltage is normal, the output voltage of the RGB three guns is close to reasonable, the ABL circuit is not abnormal, and it is judged that the soldering fault is faulty. Welding, test machine, fault remains. However, the relevant operating voltages are always normal! Raise the acceleration board voltage, white screen and cross the line, it seems that the brightness signal is lost, so it involves the problem of the digital board! I am poor at the moment. Go to the next question (handling remote control reception).
2, Skyworth receiving head is easy to pass, everyone knows, no thinking, first replace it, start, any remote control how to launch, the TV has no response! Check the signal output of the receiving head. When the remote command is pressed, the hands are shaken, indicating that the remote control signal has been received and sent, but the machine does not respond. Is the CPU problematic?
According to personal experience, the CPU performance may be abnormal: 1. +5V/3.3V is abnormal; 2. A related signal source abnormally outputs an error command; 3. The CPU itself is heroic (no cure)
Check that +5V is normal and extremely stable, eliminating power failures. The ability to output an error command leaves the panel with a touch of a button! Does the panel button leakage cause such a fault?
Just the button designed by the machine is a single small board, the idea is here, unceremoniously unplug the button small board. Press the remote control and the TV will react immediately! TNND! ! ! A few small buttons almost destroyed my first name! !
At this time, the friend's wife snack is ready. Beer, bragging, and the north of the country, the tiger caught and tied, and the dragon caught the cramps! O (∩ _ ∩) O ha ha ha ~ all face red ears, spit and ugly, have forgotten who they are...
Unconsciously, more than two hours passed quietly... The TV is all right! With the mind still awake, the panel buttons are all replaced. Install, try again... super normal and no black screen anymore.
The electronic clock on the wall reminds that it is already more than two in the morning! The friend also ordered his wife to go downstairs to buy beer. With fullness, drunk, clean up the guys and say goodbye to home----I am also afraid of my wife!
Show tips: Some of the failures of Skyworth HD are incredible! In this example, because of the leakage of the button, in addition to affecting the reception of the remote control signal, an error command is issued, which destroys the normal state of the CPU brightness control, thereby causing the blackout screen to be lost due to the loss of the luminance signal! So, when you encounter some strange faults and the circuit works normally, ask your friends to consider the awful panel buttons! !
Thank you for your hard work, the show will not let everyone down!
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