Screen glows but no image - tried replacing boards to no avail
TV I am trying to fix:
Model: TCL 55US57
Service Number: 55US57TGAA
Serial No.: 1606GTC000557A01148
Manufactured: June 2016
ISSUE I AM BEGGING FOR YOUR ASSISTANCE WITH:
About 6 months ago, this TV lost its picture. When turned on, I immediately heard a very high pitched humming then the screen lit up, it still had sound, but no picture came on the screen. I recently decided to fix it, so after some research, I determined it was most likely a board and I ordered all new boards for the TCL 55US57. After replacing all boards, it was the same issue; a high pitched humming, the TV would glow but show no picture and the audio still worked. When powered on, it would continually turn on, then off, then on.... until I unplugged it. I did swap the two T-Con board ribbons to see if that may change anything and when turned on, it actually ended up showing two bright halves of glowing colors on the screen. Both halves did not show any content, simply glowing colors, clearly different from one another. This gave me hope because I thought perhaps it was just those two ribbons causing the problem. I then attempted swapping them once again and I was no longer able to reproduce that response. Finally, I did one last swap of the t-con ribbons and one of the circuits on the T-Con board began smoking. I then decided I did not want to break anything else and wanted to ask for your expertise on what may be going on with my TCL (Roku) TV. Any and all feedback or ideas would be TREMENDOUSLY helpful.
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