Hi
I aquired a Samsung UE46EH5000 from a lady that said it was turning on and off so she just purchased a new one.
On plugging into the mains and turning on i get a solid red light.
On using the on/off button or remote i just get a flashing red light in a pattern of flash/flash gap flash/flash gap flash/flash etc.
Opened it up and disconnected the main board from the power board by removing the connecting ribbon cable with the hope of getting either a 'no backlight' or a 'working backlight' but got neither,i just got a blinking backlight that turned on and off randomly at about 1 second or so intervals.
So i disconnected the led connector from the power board so that there was nothing connected except the power lead and started to check the voltages.
At CNM803 which is the connector to the main board it said there should be 13v at pins 1,3 & 4 but all i got was a fluctuating voltage of 0v to 8v and at pins 11,12 & 13 i should have got 5v but at 11 & 13 i got a fluctuating voltage of 0v to 4v but at pin 12 i got a solid 5.2v which seemed as it should be.
Next i checked the led backlight voltage at CNL802 (the connector that connects to the backlights) and at the 2 pins 1&2 (D1+ and D1+) i got a fluctuating voltage of between 288v and 318v (this is obviously with no load on)
I would appretiate some info of where to go from here.
I suspect that something is not quite right with the power board but need someone with more experiance to advise what to check next.
The power board is a BN44-00497a - rev 1.2, it all looks very clean with nothing visually obviously bad (no bulging caps or anything leaking or burnt)
I have an lcr-t4 esr meter that i can use to test the caps but maybe somebody else may have a better idea of what to try.
Thanks
Have attached a picture of the power board
I aquired a Samsung UE46EH5000 from a lady that said it was turning on and off so she just purchased a new one.
On plugging into the mains and turning on i get a solid red light.
On using the on/off button or remote i just get a flashing red light in a pattern of flash/flash gap flash/flash gap flash/flash etc.
Opened it up and disconnected the main board from the power board by removing the connecting ribbon cable with the hope of getting either a 'no backlight' or a 'working backlight' but got neither,i just got a blinking backlight that turned on and off randomly at about 1 second or so intervals.
So i disconnected the led connector from the power board so that there was nothing connected except the power lead and started to check the voltages.
At CNM803 which is the connector to the main board it said there should be 13v at pins 1,3 & 4 but all i got was a fluctuating voltage of 0v to 8v and at pins 11,12 & 13 i should have got 5v but at 11 & 13 i got a fluctuating voltage of 0v to 4v but at pin 12 i got a solid 5.2v which seemed as it should be.
Next i checked the led backlight voltage at CNL802 (the connector that connects to the backlights) and at the 2 pins 1&2 (D1+ and D1+) i got a fluctuating voltage of between 288v and 318v (this is obviously with no load on)
I would appretiate some info of where to go from here.
I suspect that something is not quite right with the power board but need someone with more experiance to advise what to check next.
The power board is a BN44-00497a - rev 1.2, it all looks very clean with nothing visually obviously bad (no bulging caps or anything leaking or burnt)
I have an lcr-t4 esr meter that i can use to test the caps but maybe somebody else may have a better idea of what to try.
Thanks
Have attached a picture of the power board
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