Samsung QN75Q6DRA, No Picture, Has BL, and Sound

[Diah]

Here is a photo from another strip and you can see that the top row of contacts (4,5,6) are all connected to ground.

yes, i can see this circuit with other ESD configuration...i cant see if it sane 4 as OP .. from yours photo unclear

for example i posted at other threat photo with E5 and they are all 456 GND in circuit ... out side there are other story

here

[lotas]

So I ask you to take a high-quality, large photo without shadows...

[Diah]

to give the subject references to other users on this critical ESD E5... i took now one from Samsung E5 9 OP are 4--- 456 as Lotas stated they are GND... in diode mode there are all reading Open.. in reverse too.

[lotas]

So you need to check all 13 pins relative to the ground with a multimeter, there should be no low resistance or short circuit and the left bar should not be connected to the right bar, that is, the cables are disconnected...

[Dodgethis]

Lotas, Diah, I appreciate your patience. I have include new photos with no shadows. I have included notes on my findings. I believe the TVS Diodes are fine. I checked on the other side of the tv's driver/ buffer board. I received the same results as to to the driver board in question. Can anyone tell me what is that device in front of the 4 TVS Diodes? I ask ask in the color orange box, while in Diode mode, I beeped in different spots of the component. I wondered if that is worth to mention as the right side of the TV displayed a picture and the left side boot looped and didn't provide a picture, wondered if it was shorted out. I tried to ohm it out, but my suspicion or guess is its Diode as well. Proud to get this far, and glad I am not a board parts changer as of yet, looking forward to de-solder soon!

[lotas]

And on the other, working side, how does it show?
Gently heat the leg with a soldering iron on one side and lift it up a little so that this pin does not touch the board, and check its resistance again with a multimeter.
This is also some kind of two-anode suppressor; it should not show anything in any direction.

[Dodgethis]

Hey Lotas, I have attached photos shows the working side, with the TVS diode and anode suppressor. I have one leg lifted on the non-working side, (no photos attached), and could not measure resistance even using skinny probes.

Lotas is the anode suppressor needed to allow picture on screen? If it is lost, can a substitute be used? i.e diode, jumper wire? Just curious?

[Diah]

the pin marked with orange are GND on this this Photo

not good idea to play with it... as its nothings , just belong to COF protection no read at alll

[lotas]

What other jumper, you will again short-circuit this line to ground. I don't understand, did you lift one leg and the short one disappeared at this point?


What does your multimeter show on these pins?

[Dodgethis]

Lotas with the suppressor lifted one leg in that photo, i have 0.2 ohms.

Guys I'll come clean, I screwed up, on the working side i was lifting the one leg up gently on the anode supressor and it came off both sides. I wanted to know if i could read anything and compare the two on both sides. Is it game over, or can we substitute in a component?

[lotas]

Lotas with the suppressor lifted one leg in that photo, i have 0.2 ohms.

Is 0.2 Ohm on the diode itself or is it left on the board?

[Diah]

Lotas with the suppressor lifted one leg in that photo, i have 0.2 ohms.

Guys I'll come clean, I screwed up, on the working side i was lifting the one leg up gently on the anode supressor and it came off both sides. I wanted to know if i could read anything and compare the two on both sides. Is it game over, or can we substitute in a component?

i said don't play---- the last things you can here... listen to the song Demis Roussos Goodbye My Love Goodbye

[Dodgethis]

lol!!! Diah I refuse to give up, Lotas I'll have something for you soon.

[Diah]

good to hear you are real fighter.... don't give up hope u will play the song on yours screen soon with lotas help...

the parts lotas mentioned one side are gnd and the other will read zero to any point... as i wrote early its belong to cof cells freq discharge

[Dodgethis]

Thanks Diah, I'll do some research on it, Never herd of it before between you and lotas knowledge

Is 0.2 Ohm on the diode itself or is it left on the board?

Hey Lotas, its 0.2 ohms left on the board, one leg is soldered to the board. I couldn't measure anything on it

[lotas]

Clearly, check the resistance on these ceramic capacitors.

[Dodgethis]

Clearly, check the resistance on these ceramic capacitors.

First Capacitor going north from the suppressor I have the following:

C1: 3.992 k ohm
C2: 18.07 K ohm
C3: 304.7 K ohm
C4: 9.49 k ohm
C5: 9.49 K ohm
C6: 220.3 k ohm
C7: 221.4 K ohm
C8: 9.45 k Ohm
C9: 9.44 K ohm
C10: 0.630 Mega ohm ----- Maybe bad?
C11: 302.4 K ohm
C12: 3.96 K ohm
C13: 3.94 K ohm
C14: 3.94 K ohm
C15: 43 Mega ohm ----- Kept Increasing in resistance, weird has to be bad right?
C16: open line ----- obviously bad ?

[lotas]

It would be good to track which pin of the connector this short circuit (0.2 Ohm) comes to, in order to find out what kind of signal it is.

[lotas]

Maybe masking the contacts of the U-cable will help you; take a high-quality photo of this cable from the back side so that the contacts can be seen.

[nomoresonys]

Not sure whats wrong, I know this tv was given to you. For anyone thinking about a new tv, my best advice is...DO NOT buy a samsung.