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.
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Re: EU55JS9000T black screen and sound good
Originally posted by totof View Post415 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.
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Re: EU55JS9000T black screen and sound good
Originally posted by totof View Post
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.
This is not the right way.
Complicated, very complicated (for me)Last edited by totof; 10-08-2023, 04:44 AM.
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Re: EU55JS9000T black screen and sound good
Originally posted by lotas View Post
Much too expensive for my colleague especially for a used card.
Originally posted by totof View PostI 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
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Re: EU55JS9000T black screen and sound good
Originally posted by totof View PostMy 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.
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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.
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Re: EU55JS9000T black screen and sound good
Just more of samsungs planned obsolescence but many seen this one coming.
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Re: EU55JS9000T black screen and sound good
Originally posted by nomoresonys View PostIt 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.
Except that 8 years later the box no longer exists, it cannot be found even in the Samsung approved repair center.
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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.
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Re: EU55JS9000T black screen and sound good
Originally posted by nomoresonys View PostLooks like they run very hot with little ventilation if any, if I had to use one that worked, I would leave the cover off and also get some air blowing on it to try to keep it cool.
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Re: EU55JS9000T black screen and sound good
one inductor with no voltage is normal, is for the Sat input/output
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Re: EU55JS9000T black screen and sound good
Looks like they run very hot with little ventilation if any, if I had to use one that worked, I would leave the cover off and also get some air blowing on it to try to keep it cool.Last edited by nomoresonys; 10-07-2023, 03:51 PM.
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Re: EU55JS9000T black screen and sound good
The problem is that this OCB model cannot be found, either new or used.
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Re: EU55JS9000T black screen and sound good
Ok, that's part of the battle, now to just find someone with a properly functioning ocb to compare with, I have no idea what those voltages should be, have always stayed away from those ocb tvs.
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Re: EU55JS9000T black screen and sound good
Guess the possibilities are, bad cable but you said you tried a good one, bad ocb, maybe the guy who tried a different ocb had a bad one or one that was incompatible, I would check as may components as I could on the ocb, bet one is bad.
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Re: EU55JS9000T black screen and sound good
I checked the connections on both sides, no problem detected
I measured the voltages on all the self on the OCB board.
L203 = 5.1V
L201=1.51V
L208,L209=12.3V
L901=1.16V
L304.305=0.92V
L302=0.89V
L802=0.05V !!!!!!!!!!!!
L401=1.09V
L402=0.97V
L202=3.3V
L404=0.90V
L403=1.8V
L307=0.99V
Maybe a problem on L802 but I don't know what it's for because I don't have the card schematic.
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Re: EU55JS9000T black screen and sound good
The socket on the tv that you plug the cable into may be damaged, check it over.
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Re: EU55JS9000T black screen and sound good
Originally posted by Davi.p View PostOCB has a short circuit that disables the screen (12v off> tcon off) that disables the dim signal to the led driver board (backlight off).. since you are not a technician you have to get a replacement ocb.. 12v on MB maybe remains on because of a protection circuit at valley of the screen switcher mosfet..
I checked the B13V signal on CN201 (pin 25,26 on main board side) and I see 12,73V when OCB is not connected and 12,67V when OCB is connected.
It's a little below 13V but it might still be normal, I don't know.
I'm following up on any leads that could help me find the origin of the problem.
I have been looking for the OCB card diagram for several days but it is nowhere to be found.
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