Samsung UE40C6510 - Power LED blinking - Not booting up

[DemonBG]

Hi all,

As per the title, i got a Samsung UE40C6510 (UE40C6530 and C6530 is the same) from the 'Bay.

PSU: BN44-00357A
Main Board: BN40-00187A


Symptoms:
As soon as the set is plugged in, the relay on the power board clicks (once) and the LED blinks 5 times, stops for a few seconds, then carries on blinking over again.

If any of the buttons are pressed on the screen / remote then the LED does respond to the input but makes no difference to the screen turning on.

tried so far:
I have tried unplugging the main board from the PSU (as per the service manual) which is supposed to make the backlight turn on when plugged in, but again - nothing! This makes me think it is either the PSU or the LED backlight circuit?

A small Side note:
The courier i used to get the set shipped to me *Cough* PARCELFORCE *Cough* was more than happy to use the box as a football which left the frame cracked. Fortunatey the panel itself doesn't look to be damaged though... I guess i wont know till it actually boots up!


Also; i don't have access to my Voltmeter for the week but will have it back by next week


Open to all your suggestions. Thanks very much all.
Demon

[freakaftr8]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Was this a tv you purchased not working or was it new? I would file a claim with your postal department first!

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Hi bud,

Its one i bought used (faulty) on eBay and i knew about this specific fault before i bought it (the symptoms have not changed between being shipped and received)


Parcelforce have outright rejected my claim for damage despite being double boxed and wrapped in 20 meters of bubble wrap and polystyrene simply stating "We do not accept claims for TV's" Despite being perfectly happy to accept the extra cost i paid to insure the package... Not what i would describe as ethical conduct...


All the best,
Demon

[mmartell]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

How many wires going to the backlight from the power supply ?

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Hi mmartell,
Thank you for your time.

You can just about see in the picture above (the left hand connector on the PSU) there is 8 wires going to the backlight.

Hope this helps and thanks again,
Demon

[moonpuncher]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Was this a tv you purchased not working or was it new? I would file a claim with your postal department first!

I feel like a jerk

[mmartell]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Sorry I missed the fact that you had the service manual. I asked because some sets need extra jumpers to bring the backlights up without the main board.

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Sorry I missed the fact that you had the service manual. I asked because some sets need extra jumpers to bring the backlights up without the main board.

hi mmartell,

I will double check to make sure I have the correct service manual as they one I have MAY be for the US version of the TV (UN40C6500).

Thanks for the heads up.
Demon

[wreksta]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

mate bite the bullet and strip the tv right down remove all diffusers and plastic sheets note the order they are in and clean hands try not to touch them to much

you may find you have a blown led or led's which is easily fixed

report back

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

hi guys,
thanks very much for the inputs. I looked over the service manual again and as I suspected out was fur the US version and does not specify my power board in the alternative parts list... May need some help finding the specific service manual for my Tv...


I will bear that in mind to wreksta, I will wait till I have my DMM back first tough =)


Thanks again,

Demon

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Hey all,

Wanted to revive this thread as i now have my DMM at hand and would like to get this set working

I looked over the service manual that i had and it was for UN40C6500 which i believe is the US version of this set - My model (LE40C6510) has different board numbers... This may explain why removing the main board cable did not turn the backlight on.

If anyone has access to the service manual for this specific set i would appreciate any help.

I'm open to suggestions on what to test next

Thank you all in advance,
Demon

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

correction my set is UE40C6510 not LE...

[mmartell]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

I'd doubt any design differences would include the backlights coming on with cable removed in one version and not the other. ie you might have open leds in your backlight.

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

hi mmartel.

I'm not 100% sure. I probed the main filter caps with the main board plugged in and get a steady 388V but get a very small village as soon as the main board is disconnected which makes me think it's not getting the power on signal with that board disconnected?

I'm hesitant to tear the panel apart until I'm sure it's not the boards...

[budm]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

It has four pairs of cables so it probably has 4 strings of LED. The black leads are probably the LED return wires. You can use DC Amp meter in series with the LED string, have to do one string at a time but the bad part is that you have to splice in the feeding wires (Grey and Blue) to put the meter in series with the LED string. The string with open LED will not show any current draw when the TV is turn on before the LED driver goes into protection shutdown due to open circuit.

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Hi Budm,
Thank you for the suggestion but the LEDs do not turn on at all (not even 2s to black) so I'm not sure if what you suggest would provide any readings?

One thing I have noticed is a abnormal looking IC on the main board... I will try and get a picture.

Thanks all,
Demon

[budm]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

OK, then just to be sure, hookup the DC meter to chassis ground and one of the 4 feeding wires to see if you do have any DC there at all, if not, then the main LCD drivers may be dead. I need to look at the diagram to see how it works.
Follow-up, this unit has 4 LED strips, two strips in series per string, so it has two strings with two power supplies for LEDs as shown on page 1.

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Hi Budm,

thanks very much for the help so far. I actually managed (Somehow?) to get the LED circuit to boot up! I was removing the connector between the PSU and main board (while the TV was plugged in) and while the connector was half seated, the backlight lit up and remained on... as soon as the connector is fully seated or completely out it turns back off...


Interestingly, the backlight seems to cycle through bright and Dim as the standby LED flashes. As the LED flashes 5 times then stops, the backlight goes dim for a second (while the LED has stopped flashing and is off) and then gets bright again when the LED starts flashing again...


I have also attached a picture of the component which looks a little fried... What do you gents think?


EDIT: Just discovered the main board P/N is BN41-01444C - not what i originally stated...

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Any advice at all would be appreciated... =)

[DemonBG]

Re: Samsung UE40C6510 - Power LED blinking - Not booting up

Anyone able to shed any light on this fault please?

I think the backlight system is ok as it has booted up but is there anything else i can do to diagnose?

Thanks all,
Demon