SAMSUNG LN55C650 Power Supply ?

[colormebad]

Does anyone know what kind of voltage should be here when Tv is powered up ?? I have no reading with TV on, just makes the sound on ' and most voltage I have checked on main board and other places check out so far...

[johnboy1313]

Re: SAMSUNG LN55C650 Power Supply ?

That's high voltage for the backlight inverter. I'm not certain, but I think it's too high for your meter to read.

[budm]

Re: SAMSUNG LN55C650 Power Supply ?

Do not try to measure that high Voltage unless you want to blow up the meter, it is about 2000VAC.
What is the TV not doing?

[colormebad]

Re: SAMSUNG LN55C650 Power Supply ?

Do not try to measure that high Voltage unless you want to blow up the meter, it is about 2000VAC.
What is the TV not doing?

Has the normal on sound it makes when you plug the ac cord in... Turn on the tv and it blinks 5 times and no light, but all boards seem to be powered up... No video..... When you turn it off it makes same sound and light stays red , which I think is normal....

[CapLeaker]

Re: SAMSUNG LN55C650 Power Supply ?

Do you get BLon from the main board?
How much voltage do you get at the main filter cap on the PSU (>360V DC)?
Do the back lights come on at all?

[budm]

Re: SAMSUNG LN55C650 Power Supply ?

Power supply/inverter board BN44-00342B
Look really close AT THE White rectangular capacitor CI818 (2w474k) right next to the white fuse in the middle of the board to see if the sides of the cap any slight bulging, that is the common failure cap.

http://www.shopjimmy.com/samsung-bn4...upply-unit.htm

[colormebad]

Re: SAMSUNG LN55C650 Power Supply ?

Power supply/inverter board BN44-00342B
Look really close AT THE White rectangular capacitor CI818 (2w474k) right next to the white fuse in the middle of the board to see if the sides of the cap any slight bulging, that is the common failure cap.

http://www.shopjimmy.com/samsung-bn4...upply-unit.htm

No backlight at all..... I will go out and check the cap closer..... What should the voltage be on the plug going from the power supply to the inverter ?
This is what I have below
Pin1 12.7 V
Pin2 0
Pin3 0
Pin4 Gnd
Pin5 Gnd
Pin6 9V
Pin7 9V

[colormebad]

Re: SAMSUNG LN55C650 Power Supply ?

Do you get BLon from the main board?
How much voltage do you get at the main filter cap on the PSU (>360V DC)?
Do the back lights come on at all?

Which cap are you referring to ??

[budm]

Re: SAMSUNG LN55C650 Power Supply ?

Which cap are you referring to ??

He is referring to the two large black caps laying on their sides, it should have close to 400VDC measured BETWEEN the two legs of the cap, the caps are in parallel so you can check it on either one of the two caps.

[budm]

Re: SAMSUNG LN55C650 Power Supply ?

No backlight at all..... I will go out and check the cap closer..... What should the voltage be on the plug going from the power supply to the inverter ?
This is what I have below
Pin1 12.7 V
Pin2 0
Pin3 0
Pin4 Gnd
Pin5 Gnd
Pin6 9V
Pin7 9V

You have power supply/inverter board combo, the high Voltage wires (Blue/white) from the output of the power supply/inverter board is fed to the Balancer board which is to provide even drive to the CCFL.
The 7-pin connector for the Lamp error signal and the FB signal to maintain steady backlights.

[colormebad]

Re: SAMSUNG LN55C650 Power Supply ?

You have power supply/inverter board combo, the high Voltage wires (Blue/white) from the output of the power supply/inverter board is fed to the Balancer board which is to provide even drive to the CCFL.
The 7-pin connector for the Lamp error signal and the FB signal to maintain steady backlights.

Capacitor CI818 (2w474k) is swollen on both sides.. First time in years I have seen one of these go bad... I over looked it for sure.... Put a meter on it and no reading both directions.... You know a good part # or where I can buy this cap....

Cap markings
2W 474K 10
SIC 460S 21

[budm]

Re: SAMSUNG LN55C650 Power Supply ?

Panasonic ECWFD
http://www.digikey.com/product-detai...607-ND/3844530

But I would go with 630V or higher:
Panasonic ECWFA
http://www.digikey.com/product-searc...=0&pageSize=25

Or encapsulated type by VISHAY or KEMET
Original is SIC (encapsulated) from EBAY.

[colormebad]

Re: SAMSUNG LN55C650 Power Supply ?

Panasonic ECWFD
http://www.digikey.com/product-detai...607-ND/3844530

But I would go with 630V or higher:
Panasonic ECWFA
http://www.digikey.com/product-searc...=0&pageSize=25

Or encapsulated type by VISHAY or KEMET
Original is SIC (encapsulated) from EBAY.

So this # would be the better one to go back with below
Digi-Key Part Number PCF1574-ND

I couldn't find one on ebay

[budm]

Re: SAMSUNG LN55C650 Power Supply ?

Yes, that will work fine.

[colormebad]

Re: SAMSUNG LN55C650 Power Supply ?

Yes, that will work fine.

Thanks you and everyone else for there info and time... I hope I can repay the favor with problems I run into , to help someone out also... I have a lot of flat screen tv parts laying around also..... Thanks again....