Samsung LN46C630K1F

[henryvrensburg]

Hi Guys

I have the above-mentioned TV. The Standby Light is on and when I try to switch on the TV the Standby Light goes out. No green light. Nothing else happens. No sound, no backlights. When switched on with the remote, you can't switch it off. When a light is shown onto the screen, I can't discern anything.

I checked CAP C1818 as per other threads, all as per spec. I also checked the voltages on the LED Inverter cable, all are as per diagram. Voltages going to Mainboard same voltages as per diagram.

If I remove the Cable between the Mainboard and Power Supply, the backlights come on and stays on.

Voltage on Main 450V Filter CAP = 374V
Power Supply Board BN44-00341B

At this stage I'm thinking T-CON board.

Thank you for any help
Henry

[budm]

Re: Samsung LN46C630K1F

We need the Voltage readings of all the pin of CN802, you need to put down the pin name and follow by the Voltage readings for each pin except the GND pin.
"Voltages going to Main board same voltages as per diagram" So the control Voltage are all correct?

[henryvrensburg]

Re: Samsung LN46C630K1F

Hi Budm

Thank you for the quick reply

CN802
Pin1 = 13.12V
Pin2 = 13.12V
Pin3 = 13.12V
Pin4 = Grnd
Pin5 = Grnd
Pin6 = 5.14V
Pin7 = 5.14V
Pin8 = 13.13V
Pin9 = 13.13V

[henryvrensburg]

Re: Samsung LN46C630K1F

Hi Budm, do you have any other help on this.

[neilc6]

Re: Samsung LN46C630K1F

You are missing an entire row of signals and the pin name (should be a legend silkscreened). Thats why you should include pics of the board. You should get a PS_ON and BL_ON signal from the main board when you push the power buttton. If these signals are missing and the main board has power, the main board is likely fau!ty.

[budm]

Re: Samsung LN46C630K1F

Also no pin names provided as requested: "you need to put down the pin name and follow by the Voltage readings for each pin except the GND pin."
BTW, the exposed pins you see on the top side of the boards are the ODD number pin, the EEVEN number pin you will have to probe from the bottom side of the board or from the back side of the connector.

[henryvrensburg]

Re: Samsung LN46C630K1F

I'm sorry about the missing information. I'm a beginner, and really appreciate your help.

Pin 1=13.12V / Pin 2=0.0V
Pin 3=13.12V / Pin 4=0.0V
Pin 5=13.12V / Pin 6=3.33V
Pin 7 to Pin 10 = 0.0V
Pin 11= 5.1V
Pin 12 = 0.0V
Pin 13 and Pin 14 = 5.141V
Pin 15 = 13.12V
Pin 16 = 5.141V
Pin 17 = 5.141V
Pin 18 = 13.12V

Thank you

[jetadm123]

Re: Samsung LN46C630K1F

I'm thinking that pin 17 should read the same as pin 15. You may have pins 17 and 18 mixed up?

[henryvrensburg]

Re: Samsung LN46C630K1F

You are right. Pin 17 is 13.13 V. Pin 18 is 13V as well.

[henryvrensburg]

Re: Samsung LN46C630K1F

Hey guys

Am I right in assuming that the Power board and Mainboard are working as they should.

Thank you

[budm]

Re: Samsung LN46C630K1F

"If I remove the Cable between the Mainboard and Power Supply, the backlights come on and stays on." It means the Power supply board and backlights are OK but main board is not sending the BL-ON (SW_INV) to turn on the inverter circuit.

[henryvrensburg]

Re: Samsung LN46C630K1F

Hi Budm

I'll replace the Mainboard and let you know.

Thanks gain for all the help

[henryvrensburg]

Re: Samsung LN46C630K1F

Hi guys

I replaced the Mainboard as per previous discussion. It still doesn't work. I ordered the board from a reputable company.

The TV's Standby Light is on, when switched on it flashes for some time and then stays dead. If you press a button on the Remote, it flashes again. On the new Mainboard voltages for CN802 are as follows:

Pin 1 = 13.1V
Pin 3 = 13.1
Pin 5 = 13.1
Pin 7 = 0
Pin 9 = 0
Pin 11 = 5.06
Pin 13 = 5.06
Pin 15 = 13.1. (on Silk Screen diagram 13/18V - I Think)
Pin 17 = 13.1 (on Silk Screen diagram 13/18V - I Think)

Pin 2 = 5.06
Pin 4 = 5.06
Pin 6 = 5.06
Pin 8,10,12,14,16,18 = 0V

Same as before, if I remove the Cable from the Mainboard to the Power Supply and plug it in, the backlights come on and stays on.

Can someone please help.

[nomoresonys]

Re: Samsung LN46C630K1F

Did you match the numbers on the white sticker on the replacement board? looks like they are BN94-02701, sometimes boards are dead on arrival.

[henryvrensburg]

Re: Samsung LN46C630K1F

The numbers are exactly the same. This board is quite scarce, could only get one. The board number is BN94-02701G. You do get other boards but with different last letter.

[nomoresonys]

Re: Samsung LN46C630K1F

Check if you have 12 volts on each side of t-con fuse.

[henryvrensburg]

Re: Samsung LN46C630K1F

I get no voltages on either side of the fuse. I'm thinking of replacing the Power-Supply board, but all indications are that the board is working properly.

Did I buy a not-working mainboard

[nomoresonys]

Re: Samsung LN46C630K1F

So no voltage going to the tcon fuse and the fuse is good?

[R_J]

Re: Samsung LN46C630K1F

If you don't have any voltage on the t-con fuse you won't get a picture, Your power supply seems to be working ok.

[henryvrensburg]

Re: Samsung LN46C630K1F

The fuse is definitely working. So no voltages to the T-CON.

Do I look for another Mainboard