Samsung UN55B8000 clicking

[tibimakai]

I have picked up this TV and trying to repair it.
It is the mainboard the problem, I have concluded that, by removing the main harness and the backlight it's turning on.
I'm measuring components on the mainboard and I can't figure out where the problem is.
I have heated up a VDO close to the main harness connector, which it seems like it is delivering the 3.3V which is not switching on an off, which is weird.
By heating it up, eventually the clicking will stop. When I monitor this voltage, it will drop toward 0V then the clicking stops. As soos as I remove the heat, the 3.3V comes back. I will have to turn on the TV again the clicking to return.
The enable input gets 5.3V even when the TV it id in standby, which is weird, no? It should go high, when I turn on the TV.
The VDO designation is JJ=N1J, it could be a SOT-23-5 VDO of 3.3V?
I have found this info at the s-manual site. I don't see the 3.3V marked on the component, though.
By the way what kind of components are the BD ceramic capacitor looking ones? They measure 0.2Ohm.

[Shinju]

Re: Samsung UN55B8000 clicking

If there is a plug in the slot in front of the CM network chip on the mainboard unplug it and power on the panel.

See picture.

[tibimakai]

Re: Samsung UN55B8000 clicking

I have read about that and everything is unplugged, that is not needed, even the T-con cable.
Only the main harness and the power on harness is plugged in.

[tibimakai]

Re: Samsung UN55B8000 clicking

This is the regulator and the BD components(the hole row of them).
There are a couple of components at the bottom too, a transistor a couple of resistors and capacitors.

[budm]

Re: Samsung UN55B8000 clicking

BD: they are very small inductor ferrite beads.

[tibimakai]

Re: Samsung UN55B8000 clicking

Thanks Bud, that makes sense, since they show like a fuse.
I'm sick of these clicking Samsung issues.
There is a common cause for this issue?

[tibimakai]

Re: Samsung UN55B8000 clicking

If I heat up this VDO and the output voltage drops and as soon as I remove the heat, the voltage goes back to 3.3V. This VDO is bad?
Without heat, it just goes on an off 3.3V.

[budm]

Re: Samsung UN55B8000 clicking

Can we see the close up pictures of this VDO, and pictures that will show the traces leading to this VDO?
Since the TV is clicking so the PS-ON is swinging HIGH and LOW too then in sync with the clicking of the power relay?

[tibimakai]

Re: Samsung UN55B8000 clicking

Ps_On reaches only .8V, but if I remove that wire from the connector, shows only a couple of milivolts.
Yes, the voltage clicks together with the relay.

[budm]

Re: Samsung UN55B8000 clicking

Ps_On reaches only .8V, but if I remove that wire from the connector, shows only a couple of milivolts.
Yes, the voltage clicks together with the relay.

So we need to find out how that PS-ON control line is connected to.
If you can disconnect just the PS-ON wire so the power supply will boot up by forcing it on or what ever, if there is nothing wrong with another sections of the main board then you should be able to get the TV to function normally, if the TV still does not work then you have more than PS-ON problems.

[tibimakai]

Re: Samsung UN55B8000 clicking

It won't start up, by forcing the PS.
It looks like, I need a new mainboard.

[garryls tv]

Re: Samsung UN55B8000 clicking

been working on this set with clicking on off problem i see where people are repairing these bds on ebay for 150 would like to know the problem with them i have found think its ic210 reg ic on bottom of bd has a dead short off of pin 1 to gound there are 2 of these reg on bottom off bd,any way trying to find where short is comeing from its not the reg,or the caps beside reg,has feed thru on bd can anyone help me with this thanks

[budm]

Re: Samsung UN55B8000 clicking

been working on this set with clicking on off problem i see where people are repairing these bds on ebay for 150 would like to know the problem with them i have found think its ic210 reg ic on bottom of bd has a dead short off of pin 1 to gound there are 2 of these reg on bottom off bd,any way trying to find where short is comeing from its not the reg,or the caps beside reg,has feed thru on bd can anyone help me with this thanks

What is the P/N of the IC? Pictures of the board around that area?

[garryls tv]

Re: Samsung UN55B8000 clicking

What is the P/N of the IC? Pictures of the board around that area?

ic has s- 1172b on it reg ic pin 1 has short to ground

[garryls tv]

Re: Samsung UN55B8000 clicking

and from what i have found online is pin 1 of ic 210 suppose to come up to 3.3 volts it dont after checking has a short off pin 1 to ground,dont know where this feeds to try find where short at?

[budm]

Re: Samsung UN55B8000 clicking

S-1172 which case version since pin 1 can be ON/OFF Control pin or OUTPUT pin? see spec sheet attached.

[garryls tv]

Re: Samsung UN55B8000 clicking

ya pin 1 suppose come up to 3,3 volts but has a dead short to ground,have no idea where it feeds,was just doing some checks and also found pin 1 of ic 1591 has dead short to ground think thats audio output ic? not shure if its back feeding off reg ic 210? hate to try take off to see if clear short or not big ic,i was hopeing some one on here has sent a bd off for repair and seen what they replaced with people offering repair service online for same problem some one has figured this problem out,must be common for this bd hard trake down with no print of cir would be most thankful if some one has some info on this main bd fix

[garryls tv]

Re: Samsung UN55B8000 clicking

was wrong on ic 1591 found another samsung bd same ic it reads short also just feeling in dark