Samsung QN75QN95B with One Connect

[jason123]

Hello all,
I have a 75" QLED TV that I love. This morning ,as I'm watching a show, it shut off and no luck turning it on. Unplugged and waited an hour, and no activity. No clicking "On Relay" like it normally does.
I see many have issues with the mammoth external one connect box. I was going to buy one, but used on eBay they're in the $300 range with no returns. Is there a way to know if it's TV or One Connect?
Thanks

[Diah]

disassembly yours OCB and we all would know what defect are , we have here in forum from US users successful repaired it

[jason123]

Sorry for the delay.. here are the photos of the One Connect. Not even sure where to start - so help is appreciated.

[Diah]

you need to start testing this Hot area starting from the FUSE to MOSFET ceramic Caps ( blue color ) if one cracked

[lotas]

Check the capacitance of these metal film capacitors in the PFC circuit.

[jason123]

Ok, sounds good.. I'll get started on this shortly. I'm assuming this one connect is dead until it gets a signal from the TV to turn on. The connector to the TV is not labeled, so I'm not sure how to simulate a "go" from the TV. Would that be the area to get started? as I don't know if there is anything wrong with this one connect, or if the issue is with the main board on the TV?

[Diah]

OCB can also tested as stand alone , if PWM worked and can find V on cold area.... at the boards which ports installed on it Tuner USB HDMI. there are SOP8 SPI and this boards go to downside boards on it there are PS_ON. we provide from the SPI pin8 3.3V to pins of the socket then BL V 350 etc will be on and 12V too to MB...
this is last stage you go , yours first check hot part and find out V on cold area

[lotas]

Your power supply should constantly output 17v, when the TV turns on, a second voltage VDRV should also appear.

Remove the tape and look at the markings near the connector.