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Equipment Repairs => LCD TV forum => Topic started by: t1412 on April 04, 2017,13:39:31

Title: le40b551a6w
Post by: t1412 on April 04, 2017,13:39:31

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       

Title: Re: le40b551a6w
Post by: fix2003 on April 05, 2017,02:53:50

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.

Title: Re: le40b551a6w
Post by: downunder on April 05, 2017,03:46:44

Hi Shaun,

PSU schematic attached.                         Bruce

Title: Re: le40b551a6w
Post by: t1412 on April 05, 2017,09:34:35

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

shaun