Samsung UE46D6530

[Azcs]

I have been given a Samsung UE46D6530 TV to have a look at.

If I press standby, power-board relay clicks, power led flashes then it switches off and attempts to power on again over and over (relay clicking)

No backlight, no picture, no sound..

If I unplug the 20 pin power cable to the main board back light works.

Voltages on the connector are as follows:

Pin 1 = 5.24v - od level
pin 2 = 3.045v - p_dim4
pin 3 = 5.06v - Od on/off
pin 4 = 3.048v - P_dim3
pin 5 = gnd
pin 6 = 3.048v - p_dim2
pin 7 = 12.76v - B13V
pin 8 = 3.048v - P_dim1
pin 9 = 12.76v - B13V
pin 10 = 12.76v - B13v
pin 11 = 12.76v - vamp
pin 12 = 4.71v - blu on/off
pin 13 = 12.76v - vamp
pin 14 = gnd
pin 15 = gnd
pin 16 = gnd
pin 17 = 5.36v - b5v
pin 18 = 5.36v -a5v
pin 19 = 5.36v -b5v
pin 20 = 3.35v power/ on off

Pin 20, when probed with the test meter turns the power supply on.

Unplugging the T-con board makes no change.


Any ideas where I could be looking, I'm thinking main board but wonder if there's anything else I can try first ?

P.s. This tv was repaired some years back, and possible a different model mainboard was used as I can't seem to match it to any other relevant UE46D6530... I could be wrong, so don' quote me on that


Photo's attached, thanks for looking..

[dick_barton]

Re: Samsung UE46D6530

Can you give the Pin names alongside the pin numbers which would be quite helpfull.

[Azcs]

Re: Samsung UE46D6530

Can you give the Pin names alongside the pin numbers which would be quite helpfull.

I have taken the names from an older post as I honestly didn't know them and by the looks of the voltages they match mine..

https://www.badcaps.net/forum/showpo...93&postcount=4

Thanks. (Edited original post)

[nomoresonys]

Re: Samsung UE46D6530

Check the fuse on the tcon, see if you have probably about 12 volts on each side, plus probe on each side, negative probe on metal chassis back of tv, it might not be staying on long enough to get a good reading tho.

[nomoresonys]

Re: Samsung UE46D6530

Take the cable from powerboard to mainboard off, look it over see if you have any discoloration or burn looking marks around the terminals of cable, the plastic and such.

[Azcs]

Re: Samsung UE46D6530

Check the fuse on the tcon, see if you have probably about 12 volts on each side, plus probe on each side, negative probe on metal chassis back of tv, it might not be staying on long enough to get a good reading tho.

No voltage either side of the fuse (fuse is ok)

Power cable is fine both ends

[nomoresonys]

Re: Samsung UE46D6530

Maybe try with one ribbon connected at a time between the tcon and the panel, see if you get a display of any kind, always have tv unplugged from power when removing or connecting ribbon cables, don't want to get any stray surges or anything, separate test see what tv does with lvds cable from mainboard to tcon unplugged.

[Azcs]

Re: Samsung UE46D6530

Maybe try with one ribbon connected at a time between the tcon and the panel, see if you get a display of any kind, always have tv unplugged from power when removing or connecting ribbon cables, don't want to get any stray surges or anything, separate test see what tv does with lvds cable from mainboard to tcon unplugged.

Thanks for the replies, I will have to take a further look over the next day or two and get back to you

If the T-con was faulty and disconnected from the mainboard, would the tv not power up and stay on or is it's power on/off cycle behaviour normal regardless ?

[nomoresonys]

Re: Samsung UE46D6530

You proved the backlights and powerboard by unplugging cable and getting backlights on steady, so the problem can be mainboard, tcon or panel or a connection or bad cable. The tests are to see if there's a change in function, I'd disconnect ribbon cables from tcon to panel, plug power cord in see if change, no change then unplug lvds from mainboard to tcon, check for change, same rule applies(always do disconnect and reconnect with tv unplugged from power)