samsung un65nu6900f common problem, digging deeper

[lotas]

Place a jumper between these points, disconnect the LVDS cable and check again that the voltage appears on VGH.

[Cornito]

What are these points?
I'll try this and let you know.

Thank you

[Diah]

What are these points?
I'll try this and let you know.

Thank you

don't do it,,, and don't buy mb too .... rubbish are rubbish and this was no 1 of fucking samsung rubbish tv

[Cornito]

Diah you're best Samsung seller for ever and ever 😅

[Diah]

Diah you're best Samsung seller for ever and ever 😅

i had at home never forever Samsung TV come to home... Mobile was until Galaxy S5 and no more... cause their shit cheating start after that time.

[Cornito]

@Iotas thank you, i works, i've soldered the jumper between these two points and my 25V is back and stable.
Could you explain me why, I need to understand

Do I need to connect LVDS cable now to see what is the behavior or do I need to perform other tests?

Thank you

Damien

[lotas]

This says that you do not have a working panel, try masking (CKV...) on the non-working half, reduce the VGH power...

[Cornito]

I'll try to reduce the VGH Power with the resistance addition.
The masking is not working for me.
Could you just let me know what are these PIN, and why the board react like that while we shunt these two.

Regards

[lotas]

The jumper (FB_TRDY_1, FB_TRDY_3) simulates - as if we have a panel connected. When the LVDS cables are disconnected, the motherboard does not see the panel and blocks the supply voltage to the panel.

[Cornito]

Ok then so, need to add the resistance between VGH and panel and test only when the jumper is removed

[Cornito]

Using technics described into this videos i've been able to restart my TV:
https://youtu.be/kFINAT-Y204?feature=shared

Today i still face to some lines and bad colors, I need to reduce VGH voltages and rebuild some CK lines, but i'm moving forward.

I'll keep you up to date, i'll put a DC to DC to reduce the VGH voltages of the whole panel, just need to buy and receive these parts

[Cornito]

Job is done, found a way a save it.
I'll add a step up DC dc to reduce VGH from 25 to 19v on whole panel.
Defective side has been reduced at 14v
Cuted ckv and grounded

[lotas]

Everything is done correctly and the TV works.
Have you used this one?

Model: MT3608
Input voltage: 2 - 24 V
Output voltage: 5 - 28 V
Output current: 0 - 2 A

[Diah]

Everything is done correctly and the TV works.
Have you used this one?

Model: MT3608
Input voltage: 2 - 24 V
Output voltage: 5 - 28 V
Output current: 0 - 2 A

i don't think this is the way...he did it with his brain way.... he wrote step up and he need to step down... so or so its just days to back for end... let him enjoy few hours

[Cornito]

Everything is done correctly and the TV works.
Have you used this one?

Model: MT3608
Input voltage: 2 - 24 V
Output voltage: 5 - 28 V
Output current: 0 - 2 A

Hello Iotas, nope I used nothing.
I've cutted the VGH line on the defective driver panel side and took the 14v from the caps just near and make the connection.

I've bought a DC to DC but the wrong one, step down don't work for me 'cause I guess the current consumption switch the main board DC dc into safe mode.

I'll buy a step up DC dc to take the incoming 12v and convert to 19V to preserve the panel.

[nomoresonys]

Interesting, did you see a video of this technique?

[Cornito]

Yep, the one linked in a previous post

[nomoresonys]

Only link I see is post 91, can you post it here or the thread you found it in? Seems like you did the soldering in post 91 and something from another post, correct?

[Cornito]

I've followed mostly the yt link posted in post#91.

Just used other videos on the same chanel to have more confidence on action to perform.
On one of his video he explained shortly how to tale the 14V on a cap close to the VGH line.

I'll need to improve some solder and place the DC to DC Step down, so i'll be able to take some pictures to show you.

Is there something that you would like to get in details?

regards

[nomoresonys]

Was just wondering about procedure, I try to stay away from samsung as much as possible.