Samsung UE46f5000AK Stuck on Standby

[Ukdigger]

When the Main board is disconnected, the back lights are off but tapping on the chassis makes them light up and all voltages are then good. Connecting the main board up makes the TV work normally until moved. LED INERFACE STRIP BN41-01971A has a short on the first 2 pins on the left of the picture, the cable tests good. All the other pins and all LED strips test good. Is there an easy way to fix the short or do I need a new interface. Any help would welcome.

PSU number bn44-00610A L46SF_dpn

1 B13v 12.4
3 B13v 12.4
5 Vamp 12.4
7 Vamp 12.4
9 GND 0
11 B5v 5.1
13 B5v 5.1

2 Pwm. Dm 0.3
4 N.C 12.4
6 BLU ON 4.7
8 GND 0
10 GND 0
12 A5v On 5.1
14 PS.ON 3.4

[Ukdigger]

Just noticed the pinouts are printed on the power board, pins 1 and 2 and 15 and 16 aren't used so I haven't got a short.

[nomoresonys]

Could be you need to make sure the connections in the backlights are all good.

[nomoresonys]

One example of a loose connection in this video: https://www.youtube.com/watch?v=eCG1rg7dVIQ

[lotas]

This power supply will not start without a load of 5v and 13v (there is protection), and accordingly there will be no backlight when the motherboard is turned off...

[Ukdigger]

I think I've found the problem area, a tap on the top of the big heat sink with the handle of a screw driver turns the TV off and then on again. Can't see any bad solder joints.

[Ukdigger]

It's only the 12v that goes on and off all other voltages stay on

[Ukdigger]

It makes no difference if the backlights are connected or disconnected

[R_J]

You need to resolder the connections on the transformers and any of the components mounted on the heatsinks ie: mofets diodes etc., usually the transformer connections are bad.

Can't see any bad solder joints.

You may not see the poor solder joints but they are there, just resolder them adding more solder don't just re heat them

[Ukdigger]

I resoldered all the transformer connections and fets on the heatsink and now the TV stays on and it takes a hard tap with the handle of a screwdriver to make it turn off and on again. I will try doing the diodes next to see if that makes it any better. Didn't want to do too many things a once so I could pinpoint the the bad joint. Thanks for your help RJ. I will report back if I have any success.

[Ukdigger]

I went over the transformers again and now it doesn't turn off and on when tapped, so problem appears to be fixed. Thanks for all the help.