i guys,
I got this TV for free, with no back light. I saw videos online about shorted flat ribbon cables, so I opened it up thinking that's what it is. I removed the cable entirely and looked at it carefully, it doesn't seem to have any shorts. Noticed there was a shorted diode D32 near the LED connectors (CON19/20). I replaced the diode, and switched on the TV, the Backlights came on..and the TV seemed to work. But after a few minutes the diode started smoking again and went out. Something is drawing a lot of current through the diode, but there are no signs of burning on the board itself (as should have happened if something on the board were drawing alot of current). The voltage at the LED connector starts out at about 50V and slowly drops to about 43 V before the diode overheats and craps out. Anyone have any ideas what on earth this is? I cannot test just one side of the LED, since disconnecting it seems to shut down the TV immediately. I am at work, so I can't post any pictures right now.
I got this TV for free, with no back light. I saw videos online about shorted flat ribbon cables, so I opened it up thinking that's what it is. I removed the cable entirely and looked at it carefully, it doesn't seem to have any shorts. Noticed there was a shorted diode D32 near the LED connectors (CON19/20). I replaced the diode, and switched on the TV, the Backlights came on..and the TV seemed to work. But after a few minutes the diode started smoking again and went out. Something is drawing a lot of current through the diode, but there are no signs of burning on the board itself (as should have happened if something on the board were drawing alot of current). The voltage at the LED connector starts out at about 50V and slowly drops to about 43 V before the diode overheats and craps out. Anyone have any ideas what on earth this is? I cannot test just one side of the LED, since disconnecting it seems to shut down the TV immediately. I am at work, so I can't post any pictures right now.
