Hello
Model Code Sharp LC-40FG3141K
Firstly perhaps I should save myself the agony and throw this set out ? Then again I hate E-waste , or giving a person further headace in the far east or Agbogbloshie . So I digress to my last hope of fixing this pile of shite , with the dash of hope from your combined experiences
So this set is randomly turning off its backlight ( could be days, hours, minutes or seconds ) , my research suggests this maybe an over current protection , or leaky/faulty LEDS , or a bad LED driver circuit . So I opened it up , stabbed my Multi Meter on its Backlight outputs and put peepers on the caps , hoping to see something . Caps look fine , no sign of shorts or open circuits on the caps , though I am no electrical engineer . I visually inspected the backlights, they all illuminate uniformly and temporarily blinded me in the process
The single board contains both hot and cold , power and brains of the set . There is no markings to indicate the designed Backlight LED output voltage, though this is measured as 112V in total , or 56V on each of the two rails . The voltage is very stable until it weirdly goes off and drops to half .
On a side note , I blindly guessed that this is a board problem . I did find replacement boards on Evilbay ( with same model and physically identical) , though to my dismay these boards are re-used across many (Vestel) white label brands and have different firmware and do not work correctly I tried
Model Code Sharp LC-40FG3141K
Firstly perhaps I should save myself the agony and throw this set out ? Then again I hate E-waste , or giving a person further headace in the far east or Agbogbloshie . So I digress to my last hope of fixing this pile of shite , with the dash of hope from your combined experiences
So this set is randomly turning off its backlight ( could be days, hours, minutes or seconds ) , my research suggests this maybe an over current protection , or leaky/faulty LEDS , or a bad LED driver circuit . So I opened it up , stabbed my Multi Meter on its Backlight outputs and put peepers on the caps , hoping to see something . Caps look fine , no sign of shorts or open circuits on the caps , though I am no electrical engineer . I visually inspected the backlights, they all illuminate uniformly and temporarily blinded me in the process
The single board contains both hot and cold , power and brains of the set . There is no markings to indicate the designed Backlight LED output voltage, though this is measured as 112V in total , or 56V on each of the two rails . The voltage is very stable until it weirdly goes off and drops to half .
On a side note , I blindly guessed that this is a board problem . I did find replacement boards on Evilbay ( with same model and physically identical) , though to my dismay these boards are re-used across many (Vestel) white label brands and have different firmware and do not work correctly I tried
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