le40b551a6w

[t1412]

evening fella's i've had this samsung le40b551a6w in standby light flashing no start up, disconnected the buttons thinking this was the cause, but still the same, if i disconnect the tcon it stays on i have replaced the tcon but still the same fault, the power board is a bn44-00264a , head scratching at the minute any thought would be great, thanks for your time

shaun       

[fix2003]

common faults are diodes short in the power supply. any of the large diodes.
dry joints on stby ic and bridge

have replaced DP801,from 1N5406 ( 600V,3A rectifier type diode ),to a 31GF6,which is rated the same,but is a fast switching type.

this is a SAMSUNG recommended mod for reliability.apparently diode can fail int,or under load causing backlight issues & low PFC volts.

[downunder]

Hi Shaun,

PSU schematic attached.                         Bruce

[t1412]

thanks chaps i'll do the checks get back to you

shaun