A Changhong plasma TV pt42638nhdx indicator light is on, it is not turned on. After opening the back shell, 12v, 5v, 3.3v, 210v are normal, and on/off is normal. After the elimination method, after removing the z-board, there was a sound at the boot, and the problem was found. Online shopping a z board, after the arrival of the goods, carefully installed no problem after a boot is still the same. After checking that the z-board is broken again, there are quite a lot of posts on the same fault on the Internet. It turns out that the same model and different version numbers cannot be replaced. Since the user was allowed to pick it up at the time, the online shopping time was not overwhelming. Still try to fix it. After checking the bad board, there are only a few FETs that are broken. The TV screen turned on again, and I thought I was done. Plug in the signal full screen, there are red dots from time to time. This is a common problem with Samsung screen. The VRS801 is adjusted from 205V to 209V, and then the VR5001 adjustable resistance in the lower left corner of the Y board is changed from 1k to 10k counterclockwise, and the image is normal. The user has been using it for one month and no further repairs have occurred.
Big Size Switch And Socket,Big Size Switch,Big Size Socket,Big Size Switch Socket For Sale
ZHEJIANG HUAYAN ELECTRIC CO.,LTD , https://www.huayanelectric.com