Panasonic TFTV5025FL LED supply self destructs
(Yet another that I am trying to diagnose by remote control.)
I sold the power supply on Flea-Bay after writing off my TV because of a failed LED in the backlight string. Buyer had a TV with sound (and I suspect flash light test would have confirmed working LCD panel) but no backlights. He took a punt and purchased the power supply board which has the LED string supply integrated with it. He reported that the replacement board worked for about 20 minutes before failing with the smell of cooked electronics. So I'm suspecting something is killing the LED driver output. Now it runs at about 120VDC and the backlight LEDS are all in series. Does anyone have suggestions of what, in a fairly simple circuit, could be killing the power supply?
I sold the power supply on Flea-Bay after writing off my TV because of a failed LED in the backlight string. Buyer had a TV with sound (and I suspect flash light test would have confirmed working LCD panel) but no backlights. He took a punt and purchased the power supply board which has the LED string supply integrated with it. He reported that the replacement board worked for about 20 minutes before failing with the smell of cooked electronics. So I'm suspecting something is killing the LED driver output. Now it runs at about 120VDC and the backlight LEDS are all in series. Does anyone have suggestions of what, in a fairly simple circuit, could be killing the power supply?
Comment