Samsung un58tu7000fxza - Power cycles with no picture, only backlight

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

if the models match close enough and you do the testing and get same results as in the videos, then that method will probably work but it could be something else, these tvs are pretty complicated to say the least.

[cheebster]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

Well i need to first find out from which side the issue comes from, read my previous posts..

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

did you read my previous post, I do not see the thing you are calling the u-connector.

[lotas]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

did you read my previous post, I do not see the thing you are calling the u-connector.

U bridge

[cheebster]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

Yes, signals are passed from the right side where the flat comes from the mainboard/tcon to the right side, with that u-bridge. Removing it and having the jumper connected makes half of the screen work with lines.

However, i'd like to understand which side has issues. I'm confused because the lines seem to be coming from the right side (the one that is lighted up with the U bridge removed) but the right side is the side that is washed up.

So, where is the issue, from which side ? I really need to figure that out, if anyone can shed some light.

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

well it looks like you are trying the method in the video you linked, did you follow it precisely?

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

U bridge

Thanks Lotus.

[cheebster]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

For him it was clear that the issue was on one side, for me it's not. I'd like to clear this out before starting cutting traces..

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

no he didn't cut any traces, he put on the wire and removed something from panel driver board. Your post #77.

[cheebster]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

For the record, ive cutted all traces on the left side of the panel (right side of the PCB) but no change, the lines were still there and the right side is all washed out. AAAAAH.

I reconnected all the lines on the pcb..

[Kris_UE58]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

Hi everyone.Just wanna say that mine is working too. I have done taping track 22 which is feeding LCD pannel with 25V , then crossed VGH located on pannel's PCB with MB's 25V directly bypassing molex ribbon using random wire. Havent use the resistor as wasn't necessary in my case. TV turns on every time. Thanks for detailed explanation.

[pdsterns]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

I have new PS and Motherboard if interested

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

@Chris_UE58 can you show us which video you followed?

[Kris_UE58]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

It was not actually a video. The idea of linking LCD panel directly with MB described earlier gave me a clue that could be a possibility of current leak between VGH 25V and VSS -10 placed next to each other. Cheebster's post #71 and the link he found was crucial. I haven't removed anything from LCD PCB panel.

[nomoresonys]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

ok, I see, thanks
Kris.

[cheebster]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

It was not actually a video. The idea of linking LCD panel directly with MB described earlier gave me a clue that could be a possibility of current leak between VGH 25V and VSS -10 placed next to each other. Cheebster's post #71 and the link he found was crucial. I haven't removed anything from LCD PCB panel.

Alright, so taking VGH from worked like on mine directly to the panel.

What's the difference in running a wire and going thru the flex, isnt it the same ? Less resistance ?

[Kris_UE58]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

I have isolated path 22 of the flexi using tape . +25V is going through my wire only. I have soldered to the VGH testing point on LCD PCB and MB's soldering point next to the molex connector.

[Kris_UE58]

Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

Could be less resistance or something which is causing voltage drops as is pulled next to VSS -10V path 23