L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

[nomoresonys]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Ok, now try it with the cable from powerboard to mainboard unhooked, see if backlights come on steady and stay on.

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Update: Replaced ICM801CS with FSFR2100XSL. Board flashes backlight now while standby light turns on and off.
Voltages: while main board plugged in
Pins 7 and 9 (B13v)goes upto 11v then goes down with the backlight flashing
Pin 17 and 19 (B5v)goes upto 5.3v then goes down with the backlight flashing
Pin 20 (PS on/off)goes upto 3.3v then goes down with the backlight flashing
Pin 18 (A5v)has constant 5.38v
I am wondering what else may be wrong. Any help please.
ICM801CS heat sink getting to 55c

[nomoresonys]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Yep, that makes sense, the parts list I saw was for a 55 inch.

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Yes, it is very similar to 1, put it, that is, FSFR2100XSL.

Thank you. I will order it. I will update after I make the change.

[lotas]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Yes, it is very similar to 1, put it, that is, FSFR2100XSL.
Just for your "65" diagonal, it is the most powerful of this series.
In "46" the diagonal is 1800.

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Looking at the remnants of the IC-pictures posted, I think it might be FSFR2100XSL. Please take a look at it let me know what you think

[nomoresonys]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Saw a parts list but wouldn't you know it they didn't list the suffix, just FSFR1800, so if you can read the last part then it looks like it is indeed a FSFR1800XSL.

[nomoresonys]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

If you can find a quality service manual it might have a parts list in it.

[lotas]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Upon closer examination of the burnt IC the last few numbers on the part number may be 100XSL. So could this be an FSFR2100XSL? If so I will replace it with this part and update here. Thank you everyone for the quick responses to my issue.

Well, then you need to know exactly what should be.

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Yes, you don't need to measure anything, you first need to replace it with the original microcircuit.

Upon closer examination of the burnt IC the last few numbers on the part number may be 100XSL. So could this be an FSFR2100XSL? If so I will replace it with this part and update here. Thank you everyone for the quick responses to my issue.

[nomoresonys]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Ok, so put the correct FSFR1800XSL in, then continue testing as advised, how could it possibly work with 2 pins completely different, it won't.

[lotas]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

Yes, you don’t need to measure anything, you first need to replace it with the original microcircuit.

[Diah]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

When main board plugged in pin 20 shows 3.3V while back light is lit and goes down to 255mv when back light is off. This keeps cycling continuously. What can this mean.

in this case.. u need to check pin A5V if its stable
if stable mean pin 20 power on caused by Main boards didn't boot ( boot loop)
if its not stable then the issue at PSU

[lotas]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

OK got it. The only legible letters on the IC are XSL. Pictures attached. What could be the actual part I need to fix the board? I looked all over the internet for a schematic for it and could not find it.Aafter looking at the board and the schematic for the HSL I thought it would be the correct part and thats why I got this replacement.

Yes, you need to install exactly this one (FSFR1800XSL), it will not work with another one.

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

you need to measure voltage while MB connected and give attention on pin 20 reading

When main board plugged in pin 20 shows 3.3V while back light is lit and goes down to 255mv when back light is off. This keeps cycling continuously. What can this mean.

[Diah]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

I mounted the PSU board back on the TV to measure the voltages and now it is flashing the back light continuously.

Here are the voltages I measured when the main board was disconnected. Pins 2, 4, 6, 8 around 2.5V and 10 at 11mv 12 at 2.43V 18 at 5.38V 20 at 3.37V. Pin 1 at 0V 3 at 1.11V pins 7, 9, 11, 13 at 7.62V pin 17and 19 at 4.22V

I measured the voltages of the outer pins as they are exposed and could not get good readings of the inner the pins. Pins 7, 9, 11, 13 were jumping to 10V temporarily and pins 17 and 19 were jumping to 5.37V. Jumping meaning they were not constant and held at that voltage for enough time to read them and then showing some milli volts.

I am afraid now that something else has gone bad on the board.

you need to measure voltage while MB connected and give attention on pin 20 reading

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

HS and XS are completely different series, they differ in 2 pins.

OK got it. The only legible letters on the IC are XSL. Pictures attached. What could be the actual part I need to fix the board? I looked all over the internet for a schematic for it and could not find it.Aafter looking at the board and the schematic for the HSL I thought it would be the correct part and thats why I got this replacement.

[cekanayake]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

I mounted the PSU board back on the TV to measure the voltages and now it is flashing the back light continuously.

Here are the voltages I measured when the main board was disconnected. Pins 2, 4, 6, 8 around 2.5V and 10 at 11mv 12 at 2.43V 18 at 5.38V 20 at 3.37V. Pin 1 at 0V 3 at 1.11V pins 7, 9, 11, 13 at 7.62V pin 17and 19 at 4.22V

I measured the voltages of the outer pins as they are exposed and could not get good readings of the inner the pins. Pins 7, 9, 11, 13 were jumping to 10V temporarily and pins 17 and 19 were jumping to 5.37V. Jumping meaning they were not constant and held at that voltage for enough time to read them and then showing some milli volts.

I am afraid now that something else has gone bad on the board.

[Diah]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

PFC goes high when MB disconnected so BL turn on.. LED indicator lit on mean STBY V present.... but how about Power on signal !!! yours photo of the socket print chart not clear at all.

[lotas]

Re: L65X1Q_DHS / BN44-00627A Samsung UN65F6400AF Standby blinks twice five times

HS and XS are completely different series, they differ in 2 pins.