EU55JS9000T black screen and sound good

[nomoresonys]

Re: EU55JS9000T black screen and sound good

It really sucks the way samsung did this model, they made that shitty hot ocb and put absolutely no other connection ports on the tv itself, so they gave the consumer no choice but to use it.

[totof]

Re: EU55JS9000T black screen and sound good

It really sucks the way samsung did this model, they made that shitty hot ocb and put absolutely no other connection ports on the tv itself, so they gave the consumer no choice but to use it.

My work colleague, who owns the TV, told me that one of the seller's selling points was that it would be easy to upgrade the TV and repair it with this external box.
Except that 8 years later the box no longer exists, it cannot be found even in the Samsung approved repair center.

[nomoresonys]

Re: EU55JS9000T black screen and sound good

Just more of samsungs planned obsolescence but many seen this one coming.

[nomoresonys]

Re: EU55JS9000T black screen and sound good

I steer clear of any proprietary bs like that ocb cable nonsense, just give me hdmi, rca, component, toslink, usb etc. And put them right on the tv so I don't lose them.

[lotas]

Re: EU55JS9000T black screen and sound good

My work colleague, who owns the TV, told me that one of the seller's selling points was that it would be easy to upgrade the TV and repair it with this external box.
Except that 8 years later the box no longer exists, it cannot be found even in the Samsung approved repair center.

https://aliexpress.com/item/1005001530200726.html

[totof]

Re: EU55JS9000T black screen and sound good

https://aliexpress.com/item/1005001530200726.html

415 euros.
Much too expensive for my colleague especially for a used card.

I checked the capacitors for short circuits and found several with low resistance:
- C373, C377, C381, C382, C383: 36.6 ohm
- C3318: 0 ohm
- C1014: 36 ohm

I'm tracking the shorted C3318 capacitor because it's located just below the OCB connector. I removed it but it's not the one that's shorted.

[totof]

Re: EU55JS9000T black screen and sound good

I'm tracking the shorted C3318 capacitor because it's located just below the OCB connector. I removed it but it's not the one that's shorted.

I did not understand what C3318 is for in any case there is 12.3V at its terminals and it is connected to the VIN pins of several ICs: Z3013PI, TPS54427 (x2) and TPS106041 (x2)
This is not the right way.

Complicated, very complicated (for me)

[nomoresonys]

Re: EU55JS9000T black screen and sound good

415 euros.
Much too expensive for my colleague especially for a used card.



I'm tracking the shorted C3318 capacitor because it's located just below the OCB connector. I removed it but it's not the one that's shorted.

Check that diode right beside it, go ahead and check it in circuit, see what it reads.

[totof]

Re: EU55JS9000T black screen and sound good

The diode D3301 is one side connected to GND and other side to B13V from OCB connector.

Marking code on the diode is D2 W5n. It is a zener diode but I don't know if it is the good voltage.

It seems D2 code is for 3,6V zener diode. I don't know what is W5n.

I desoldered the diode and it is identified as a diode with my tester.

[nomoresonys]

Re: EU55JS9000T black screen and sound good

So what did it read?

[totof]

Re: EU55JS9000T black screen and sound good

So what did it read?

Sorry I don't understand your question

[nomoresonys]

Re: EU55JS9000T black screen and sound good

Use a multimeter. Diode mode meter connected in one direction get a voltage drop zeners are usually about .6 volts, meter leads switched and you get OL, 1.

[totof]

Re: EU55JS9000T black screen and sound good

Yes, I had done this test. 0.74V in one direction and OL in the other direction

[nomoresonys]

Re: EU55JS9000T black screen and sound good

Ok, now hopefully the capacitor is still off the board, check the pads it came off of, does it read short? maybe also check it in ohm mode.

[totof]

Re: EU55JS9000T black screen and sound good

The pads of the capacitor is still shorted.
With the multimeter I read OL for this capacitor, she is not dead.
Alas, I would have loved it if she was the one to be hs

[nomoresonys]

Re: EU55JS9000T black screen and sound good

Read the cap in ohm mode, make sure you have good connection with the probes.

[nomoresonys]

Re: EU55JS9000T black screen and sound good

If your meter is not auto-ranging you will probably need to adjust the ohm mode to the different settings and see if you get a reading, OL can just mean that your meter isn't set right.

[nomoresonys]

Re: EU55JS9000T black screen and sound good

I would take the board out of the box and look it over closely from all sides, check for bad solder joints etc.

[totof]

Re: EU55JS9000T black screen and sound good

I would take the board out of the box and look it over closely from all sides, check for bad solder joints etc.

I've done this before but didn't see anything unusual.
Without a diagram it's shit

[nomoresonys]

Re: EU55JS9000T black screen and sound good

Sometimes it can be the components in a circuit that can make things seem shorted, like if there's a resistor in circuit across it, it may read short and be ok, that's why you get the best results off the board.