Have a Toshiba 50" flat screen LCD TV. Quit working. At power-up you get a brief flash of light then all's dark. This TV was owned by my neighbor who reported the TV still receives and plays audio, but the screen is blank. There's not a whole lot to this TV. I'm wondering if the power supply board has failed (or partially failed).
I've pulled the power PCB off (and discharged the main capacitor). I'm seeing on the solder side (one sided board) what appears to be some white traces of something. The cap in question is a 56µF 100V electrolytic cap. The top side of the can does not show any distortion. Before I jump into "Replace And See" mode I wanted an opinion. Overall the board looks pretty darn clean, so to think this is flux residue seems a little questionable. Not impossible, but I'd tend to think it's not.
This cap is not on the power supply side of the board (large cap, BR, Chokes and fuse)(and other stuff). It may have something to do with powering the LED's. Given that you get about a tenth of a second flash of light then all goes dark - I'm wondering if the cap may be bad. No - I haven't pulled anything from the board yet. I'd like to get as good as possible an idea where the issue may lay before I start melting (RoHS) solder.
I've pulled the power PCB off (and discharged the main capacitor). I'm seeing on the solder side (one sided board) what appears to be some white traces of something. The cap in question is a 56µF 100V electrolytic cap. The top side of the can does not show any distortion. Before I jump into "Replace And See" mode I wanted an opinion. Overall the board looks pretty darn clean, so to think this is flux residue seems a little questionable. Not impossible, but I'd tend to think it's not.
This cap is not on the power supply side of the board (large cap, BR, Chokes and fuse)(and other stuff). It may have something to do with powering the LED's. Given that you get about a tenth of a second flash of light then all goes dark - I'm wondering if the cap may be bad. No - I haven't pulled anything from the board yet. I'd like to get as good as possible an idea where the issue may lay before I start melting (RoHS) solder.
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