I have been diagnosing what is wrong with my Sony bravia KDL-46XBR4 and took the entire t-con board off of the panel to inspect it. I decided to create a solder bridge across the top of the fuse because it appeared that the fuse may be bad. When I did so and hooked it up there was a noticeable change. I took my ohm meter and decided to put the positive side (with it switched to 20 DC) and put it on the back of the t-con fuse. The meter read, 3, 6, 10, 12.2, 1, 3, 5, 10, 12.1, 0 and while it was spiking up and back down I could hear a strange clicking sound on the t-con itself. At every very quiet click the power would drop back to zero or close to it. I tested the power coming into the UB1 board from the GF1 board and it was a steady 12.4, which I thought was a good sign it is not a power supply issue.
Next I tested the UB1 board and the power on this board was surging in the same way peaking and dropping back down to zero. When I would disconnect the LVDS cables the surging stopped, on both of the boards so I tested the power on the FB1 board and it was steady as well. Any ideas????? Im thinking t-con is bad, but would like to know before I drop some big bones on it to find out its the UB1 board which is easy to find and cheap.
....and if the fuse opened because of a short elsewhere in the chain, wouldn't you then hurt other components?
Thought #AOY: So as a kid I tested the causality chain of something. When my cat was angry, she put her ears back. When that happened, I decided to push them forward, and then she purred. (!) Turns out that it's not that being angry causes the cat to push its ears back, but being angry and pushing their ears back are two parts of the same exact thing. She could not be angry with her ears forward.
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