Hello everyone,
I am trying to repair a faulty power board from a JVC LT-26DC9BH LCD-tv. It does not power on at all. Before the complete failure, sometimes the image would randomly disappear and comes back after a few seconds. The backlight did not dim or stop working while the image disappeared.
Recently I opened it up to inspect the power board, and found that several caps have vented and are bulged. I ordered new ones with the same ratings as the old ones and replaced them (see the red capacitors on the attached image, those are new). Also I desoldered the other capacitors to check their ESR value, but on all of them it seems OK. After installing the new capacitors, the TV would still not turn on. Then I noticed something that I heard from the TV before. There is a clicking noise coming from the power board (see the circled components on the attached image) somewhere from one of these components every few seconds. It's not a relay click, but rather like electricity arcing. It's very quiet but noticeable when listening closely.
Sometimes the clicking doesn't start right away after plugging in the power, and I can see the optical audio output light up and stay on. When I try to turn it on the light immediately dims and the clicking starts again.
Could it be the transformer? I am not familiar with these types of transformers but it may be prone to failure.