Samsung UE/UN55ES6xxx - black screen with backlight on.

[dskall]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Remove the other two caps and check

[mirokulaz]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Remove the other two caps and check

It is not just the two others. I will have to remove almost all caps.

[dskall]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Well this thread had same problem now repaired. https://www.badcaps.net/forum/showth...057#post743057

[chrle]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

try to disconnect one of two cables going from t-con to driver board,and power on tv

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Hi....sorry to steal the tread....but just got a Samsung UE55ES6100 that works OK...apart the top half of the screen which is dark....

I guess this is an issue with the backlight...anyone familiar with this model? Do I have to open the panel completely to reach the backlights for testing or are there other ways to make sure/test that the issue is actually there?

BTW....in this models the backlights are LEDs or?

Thanks!

[Diah]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

I guess this is an issue with the backligh

if you upload photo of yours TV screen to show the darkness we can tell you if it BL issue.

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Adding some photos of the screen....hope it is clearly visible...

[Diah]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Adding some photos of the screen....hope it is clearly visible...

you need to open the cover of the TV and measure with yours DMM with reference to TV chassis the LED+ pins on BL socket at PSU... you have complete raw turn off it could be the inverter ... so need measurements before you do any things ells

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

OK...have taken the measurements....there are 2 connectors (have added the photos below) and the wired pins are marked R+/- and L +/- from 1-4....have put in the range for the pins where the voltage is not constant....fluctuates during the measurement...

R1+: 340-365V
R1-: 295-320V
R2+: 295-320V
R2-: 250-275V
R3+: 240V
R3-: 200V
R4+: 200V
R4-: 150V

L1+: 205-230V
L1-: 0V
L2+: 250-275V
L2-: 205-230V
L3+: 105V
L3-: 60V
L4+: 150V
L4-: 105V

Hope it is clear enough....

[Diah]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

OK...have taken the measurements.....

such measurements have many error.. this cant be.
do it in this way... yours DMM on VDC 250V and measure each group alone like R1+ with R!- R2+ with R2- and so on too for L side. always the + & - for same number.

[lotas]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

you need to open the cover of the TV and measure with yours DMM with reference to TV chassis the LED+ pins on BL socket at PSU... you have complete raw turn off it could be the inverter ... so need measurements before you do any things ells

It came out such indications regarding the common land, so no one measures.

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

OK....did the measurements for individual pairs:

R1: 20-25V
R2: 21-26V
R3: 40.7V
R4: 39.6V

L1: 6-11V
L2: 22-26V
L3: 24.5V
L4: 36.3V

The above given measurements in a range are as they were fluctuating during the measurement.

[Diah]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

OK....did the measurements for individual pairs:

R1: 20-25V
R2: 21-26V
R3: 40.7V
R4: 39.6V

L1: 6-11V
L2: 22-26V
L3: 24.5V
L4: 36.3V

The above given measurements in a range are as they were fluctuating during the measurement.

disconnect the socket between power boards and main boards then plug the tv in wall socket .. repeat yours last measurements way.
if there are no much different from last reading... post clear focused photo on yours power boards from top and down side.

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

Pairs with 1 and 2 have still fluctating voltages...

Pairs 3 and 4 are now all at 60 V each.

Photos of the PSU attached.

[Diah]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

ok. so yours BL are just 2 channel each L1,L2 R1,R2 , this is had shorted LED, the other channel L3,L4,R3,R4 are fine read 60V.
you need take out the panel and all filter sheet to have access to the LED BL. also you need to replace all at once to have clean repair.

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

OK, thanks!

Will try to open the pannel in the next days....

[croupier36]

Re: Samsung UE/UN55ES6xxx - black screen with backlight on.

So, if I understood correctly....I have to replace only the 2 LED stripes for the BL?
No need to check/replace anything on the PSU board?