Samsung UE32F4510 Red led blinking

[electrocuted]

Hello, just got this TV not working. The led lights on standby but when trying to power on nothing happens and the led is blinking twice for 5 times. If I get this right, if I remove the cable prom power supply to main board the backlight should light?

Power supply is BN44-00604F, A5V is present but no switched B voltage. LED driver input is too low, 12V.

[electrocuted]

No one has experience on this?

[nomoresonys]

"if I remove the cable prom power supply to main board the backlight should light?" So do this and tell results, also post good focused pictures of each board and one of the whole back as to see how everything is connected.

[electrocuted]

Ok, there you are:
Unfortunately my mobile is not that good in pictures... As you can see I tried to ground the power on signal but cannot see voltage than the +5v on power supply.

[electrocuted]

Here is the table of pins for the connector power supply-main board

[nomoresonys]

Try simple first, unplug tv for 15 minutes, press and hold power button on tv not remote for 60 seconds, release and plug tv straight into wall outlet and try it.

[electrocuted]

OK done this, same results!

[lotas]

OK done this, same results!

What did you think, after this manipulation your TV will work? Check electrolytic capacitors for their capacitance and ESR.

[vinceroger69]

This is a older set now i think around 2013 like lotas suggests check the capacitors for their capacitance and ESR and maybe also check the backlight leds do the backlights light up with the cable between the power supply and mainboard removed

[nomoresonys]

What did you think, after this manipulation your TV will work? Check electrolytic capacitors for their capacitance and ESR.

Has worked millions of times and is probably the first SIMPLE thing to try, so drop the smartass remarks.

[electrocuted]

This is a older set now i think around 2013 like lotas suggests check the capacitors for their capacitance and ESR and maybe also check the backlight leds do the backlights light up with the cable between the power supply and mainboard removed

This was my first question! When the cable was removed nothing lit up but I didn't know if this was normal. Now, could I turn on the power supply with the cable disconnected by shorting ps on/off pin to ground?

[vinceroger69]

can you check all the voltages like in post 3 of this thread Samsung ue32f4570ss with power supply BN44-00604F - Badcaps
I am not sure what pins need to be linked to test this power supply get us those voltages first then hopefully a more experienced member will tell us how to test just the psu output voltages

[electrocuted]

Done, all voltages are 0 volts except pin 12 (5.2V) and pin 14 (3.3V)

[Davi.p]

to test the psb at bench >jumper A5v + Power on, then apply dummy loads and test voltages, another road is to get a fixed PC power supply and feed the tv with it, 12v & 5v, you will not see the bright image due to BL off but you can test a bit..sound, dark images..

[nomoresonys]

It's a samsung ue, pretty sure these have pull-up resistors, so unplug cable from powerboard to mainboard, plug powercord in, if backlights do not come on and stay on, the problem is with powerboard or backlight circuit which includes leds and the connections.

[electrocuted]

Thanks for the help, shorted pin 12 with 14 (A5V and power on) but all voltages on connector still 0 volts!

[Davi.p]

why you posted a partial photo of the p. board? Post at least a link to a good photo, and better also of the soldering side..

[vinceroger69]

I have read a thread on this forum where budm metioned on these power supplies the transformer suffers from bad soldering so this may be worth having a look at/re solder

[electrocuted]

BN44-00604F

[electrocuted]

Measuring the voltage on the 3 large diodes (left side of transformer) I get 5.2V and 17v. It seems that the power on "fails"! Could it be a protection cancelling the power on procedure?