After some help with this TV. I got the set from an auction and it is dead with no signs of life. The set has the BN44-00259A PSU fitted. I have done the usual checks and found that the second main fuse FM802S was blown, a closer check of the board i found that UM801S (ICE3BR0665J) had damage to pins 3 & 4 (looked like shorted with a test probe by others).
Replaced the IC and checked all diodes etc (only have access to standard DVM at moment) and all checked out. Replaced fuse and powered up set still dead but fuse now intact. Checked out voltages on large cap as another thread https://www.badcaps.net/forum/showthread.php?t=21816 on here and getting 600V also getting 230V at FM802S fuse. No voltages at any pins on output header.
I used to work on some digital stuff in the past but not great on SMP's so any help would be great.
No obvious damage to track side of board pic below of PSU
Replaced the IC and checked all diodes etc (only have access to standard DVM at moment) and all checked out. Replaced fuse and powered up set still dead but fuse now intact. Checked out voltages on large cap as another thread https://www.badcaps.net/forum/showthread.php?t=21816 on here and getting 600V also getting 230V at FM802S fuse. No voltages at any pins on output header.
I used to work on some digital stuff in the past but not great on SMP's so any help would be great.
No obvious damage to track side of board pic below of PSU
Attached Files
Appears zener diode ZM801 was spiked (and was shorting internally) when UM801s pins were shorted or had failed (and they killed ZM801fault finding).
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