Samsung The Frame TV no power indicator issues diagnosing the one connect box

[EazyBone]

I got a qn65ls03ta from someone who stated shows no power at all. They said they bought a fully new tv (same one) and tested the one connect box from the old one onto the new one and said it worked.

I have no reason not to believe them, so I crack open the TV and test for voltages on the main board. There are none. I can't get any voltage at all. (Power comes from one connect to Main board then sends power to additional power board for backlights I believe)

While doing some digging I found the connection to the one connect cable ON the main board seems to be missing small pieces of the pin as shown in picture (very hard to get good pic) but you can see the far left pin is cut about 3/5 and two other pins along the way are slightly shorter then all of them.

Do we think this could be the whole problem? Connecting and disconnecting the cable damaged it and now the TV has no power.

Im likely buying the main board because it's logical but seeing what others here think. AND maybe this has been causing many others issues that they don't know about. We will see

Edit

Anyone repair something like this? Not sure how it'd be done but maybe one of you gurus knows

[EazyBone]

Edit, something didn't smell right for myself and I took apart one connect box to find dead mosfet/transistor and possibly bad resistor as well. Clearly didn't do my homework. Obviously above isn't right.

I'll report repair when figured out.

[EazyBone]

Does anyone know what blue transistor I should use for this mosfet?
t70r380p

I was taking it off the board because the whole area was covered in 27 lbs of silicone and it flew across the room and probably a gecko ate it.

I don't really understand data sheets, all I could read before getting it off was a number 4 possibly.

[lotas]

[EazyBone]

Thx lotas, I have a hard time reading these nor do I know if it tells me what blue resistor to use lol, is that data in these?

[lotas]

We are talking about this resistor, if so, what colors of the stripes on it are hard to see (orange - blue-silver - golden)?

[EazyBone]

Sorry blue transistor, it was buried. Generally mosfet has a 2kv 201 or something, I could not tell what this was.

Im still looking for it, wasn't sure if had a specific one that goes with a specific mosfet. Flew clear into the abyss and disappeared when pulling it off

[lotas]

Sorry blue transistor, it was buried. Generally mosfet has a 2kv 201 or something, I could not tell what this was.

Im still looking for it, wasn't sure if had a specific one that goes with a specific mosfet. Flew clear into the abyss and disappeared when pulling it off

So this is not a transistor, but a high-voltage ceramic capacitor.

There is a transistor next to it and there should be a similar capacitor with it.

[EazyBone]

Ahh, yes blue capacitor! That's what I'm looking for. The mosfet is bad and the only thing next to it, also buried is that orange thing shown in the picture, there's another one buried lol.

[lotas]

Orange is a choke - filter (the wire passes through the ferite ring..)

[Diah]

what are yours plan to buy new one connect or you willing to Diy the set to working... in case the second option upload the V out put print chart of one connect.

[EazyBone]

Yea I'm fixing it if I can, these boxes are stupid expensive. I just need that mosfet, the blue capacitor and a fuse which I am getting here soon.

I will upload a couple pictures I'm still trying to find out what blue capacitor I need! Gonna look for it with my wife tonight.

I'll upload in a few hours some pics, this OCB has 2 fuses, the first one is fine, the second one blew. Main caps and everything leading up to second fuse is fine and I get voltage on one side of fuse, just additional data

[EazyBone]

So here's the output voltage, I'm going to replace this cap-- I found it!!-- and mosfet/fuse and when I do if we aren't in working order I'll post. But here's the pic for ya just because

[EazyBone]

I don't know have any replacement mosfet for this so china gonna take a week or so before I get it and I post back.

Edit

Does anyone know why they put 2 magnets in the back of the frame TV? I really don't see the point of it. Kind of odd. Pic below

[TVAddict]

While doing some digging I found the connection to the one connect cable ON the main board seems to be missing small pieces of the pin as shown in picture (very hard to get good pic) but you can see the far left pin is cut about 3/5 and two other pins along the way are slightly shorter then all of them.

Looks like you may have to hard wire that pin on the left, it looks like a piece broke off??

[EazyBone]

Looks like you may have to hard wire that pin on the left, it looks like a piece broke off??

Ya I know ! Hope the small amount of remaining pin may be enough, one thing at a time, since now I had to eat crow and realize it's the one connect box that blew up, then I'll see about this last pin. But if probably buy a new main board for $54 instead of something like that.. once this box is fixed then work towards the next step.

[Diah]

the defect parts you could find at any scrap PSU you have..

[EazyBone]

the defect parts you could find at any scrap PSU you have..

I have tons of them, but I don't particularly know how to match them up. None of them have this type, and I'm not literate enough in mosfet understanding to know of a replacement type.

I even went through non scrap boards searching for this type and can't find it.

Do you know what type could replace it that's common on a Samsung PSU?

[TVAddict]

I have tons of them, but I don't particularly know how to match them up. None of them have this type, and I'm not literate enough in mosfet understanding to know of a replacement type.

I even went through non scrap boards searching for this type and can't find it.

Do you know what type could replace it that's common on a Samsung PSU?

You'll have to look up the datasheet of whichever transistors/mosfets you come across in your spare parts, but going on the datasheet of the original no MMT70R380P it's basically a 700 - 750V 11amp N - CH Mosfet, so whichever other mosfet you look up has to match those specs of the original no, also pay attention to the pin configuration with respect to GDS.

[TVAddict]

Forgot to mention, some fets require an insulation.