Samsung LN46D630M3F, TV powers on, sound works but no backlight

[budm]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

As you can see, the circuit is very sensitive (Triming the 38.8K with 2M resistor) and they set the output Voltage by trimming the Total resistance of two resistors, so as long as you get the output Voltage to be around 380~390V range then you will be OK, i would try to get the resistance toward higher Value than lower value. What is the next up value of 38K 1% available at digikey?

[Five_magics]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

As you can see, the circuit is very sensitive (Triming the 38.8K with 2M resistor) and they set the output Voltage by trimming the Total resistance of two resistors, so as long as you get the output Voltage to be around 380~390V range then you will be OK, i would try to get the resistance toward higher Value than lower value. What is the next up value of 38K 1% available at digikey?

As a single resistor, there are 38,3k 1% available. If I use resistors in parallel I can go with 56,2k with a 118k for a total of 38 068 ohm.

[budm]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

You can try both setup and see.

[Five_magics]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

Ordered everything (the caps, the resistors and the IC). Will report back whenever I receive everything.

[smuddge]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

did anyone get to the bottom of this? I have the same problem as the original poster. just would like to know what I need to order to fix it.

[Flip_ep]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

Any update on this havin the same problem. Picture sound good just no backlight. Inverter is good.

[Flip_ep]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

Resoldring the joints fixed my problem. For backlight now working tv good so far.

[Louis82]

Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

Resoldering bad connections has worked only for a few days. Problem is back again. Any update in regards the solution for this.

Thanks