TCL color TV AT25266B no video failure repair - android

The TCL TV model AT25266B has no video repair (the 4052 fault of video 2 actually affects video 1 is not normal)

A few days ago, I was invited to come to the door for repair. A look at the TCL TV model AT25266B. Test machine, found that video 1 has no sound, no new image, try to change the new AV cable, the fault remains unchanged; connect the Panasonic Panasonic DVB machine brought by yourself, the fault remains unchanged. Converted the TV to Video 2 and found no picture.

From the above analysis: the owner's AV line and "Snow White" S6 receiver is no problem, it is indeed a TV failure.

Open the cover and find that the board has two 4052 video converters. Find a 4052 from the lunch box, first change the 4052 of the video 1 (there is no sound failure), replace it, test the machine, the fault remains.

Analysis: If there is a problem with video 1, I changed the new 4052. It should be reasonable that video 1 is normal, but why are the two videos still faulty? Isn't it a problem with the 4052, is the problem with the super chip? If so, it will be troublesome!

Think about it, or start with simple, don't move the chip easily.

Think about it, the video 2 of the 4052 has not been replaced, is it, if the video 2 of the 4052 has a problem, it will also affect the normal video 1, resulting in a problem with the video 1?

So I decided to try to change the 4052 of video 2. But only took a 4052, has been replaced. I thought about it, since the 4052 of the video 1 has been replaced, and the fault remains, it means that the original video 1 of the 4052 is no problem, and it is impossible for the two videos of the 4052 to be bad at the same time. Then replace 4052 of video 2 with 4052 of the original video 1.

Holding the try, luck, test machine, the miracle happened! Video 1, video 2 are normal! Connected to the sixth signal, the image and sound are completely OK!

Please discuss with the experts, why the 4052 fault of video 2 (no picture is silent) will affect the original normal video 1, causing it to be abnormal (has no sound and no image)?

Chen139691: These two 4052 are video conversion and one is audio conversion. What you call video 1 is actually audio conversion. The movement of TCL TV has no image and sound. Everyone knows that the real video conversion is what you call video 2, because the block is damaged, so video 1 and video will appear. 2 have no images.

Yang Donglin: The AV1 and AV2 of this sticker are separately converted into video and sound by two 4052 respectively. The AV1 image and sound that the landlord said is converted by one 4052, and the image and sound of AV2 are converted by another 4052. . Understand this, it is simple to fix such a fault. Look at the drawings: the landlord began to change the sound conversion block, the latter is the video conversion block.

Rollo Printer
Milestone shipping label printer 4x6 inch thermal waybill printer
Printing Method:Thermal Line Printing
Interface:USB/ USB+BT
Paper type:Thermal Label Paper
Printing Width:38-108mm
Paper width:40~120MM
Paper length:30~250MM

Support OS:Wins/Mac/Android phone/1/Linux

ShengXiaoBang is the Barcode scanner and Printer manufacturer in China.

with over 6years export experience that we know the quality is our soul.

Many clients re-order to us for our stable quality and competitive price.

please contact us for more information and you will get what you really want.

Rollo Printer,Rollo Label Printer,Rollo Thermal Printer,Rollo Shipping Label Printer
ShengXiaoBang(GZ) Material Union Technology Co.Ltd , https://www.sxbgz.com