Samsung UE40KU6172U blanking problem!!??

[peste]

hello...Samsung UE40KU6172U, source module BN44-00806A...initial defect...the LEDs are blue (you can see the image in blue)...or bought new LED strips (same code strips) and installed...after turning on without mounting the display, speakers, etc., the Samsung starts from standby, the LEDs light up, then it stops, goes into standby and starts again...and so on...from this moment it cannot be turned off from the remote control...I put the bars back on the blue and it still does the same thing..any idea???...maybe I did something wrong!!!...maybe someone has a diagram???

[vinceroger69]

Re: Samsung UE40KU6172U blanking problem!!??

if you disconnect just the mainboard do the backlights stay on?

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

if you disconnect just the mainboard do the backlights stay on?

yes..

[nomoresonys]

Re: Samsung UE40KU6172U blanking problem!!??

which backlight are the ones that stay on old or new, if its the new ones are they also blue?

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

which backlight are the ones that stay on old or new, if its the new ones are they also blue?

I tried with the old ones (blue).....I removed the power plug of the motherboard and the bars stay on..the new ones have a white light but they were not tested with the plug removed..

[nomoresonys]

Re: Samsung UE40KU6172U blanking problem!!??

ok, the old ones work but are blue which means they are bad unless you have a yellow diffuser sheet, seems like the new ones may be bad, make sure you bought the right ones, they may just be faulty from the factory, can you test them?

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

ok, the old ones work but are blue which means they are bad unless you have a yellow diffuser sheet, seems like the new ones may be bad, make sure you bought the right ones, they may just be faulty from the factory, can you test them?

ok, I changed them and the new ones also work..with the power plug removed, the new ones light up white..

[Davi.p]

Re: Samsung UE40KU6172U blanking problem!!??

it is possile that it wants the panel to be connected.. or it wants that the tcon be disconnected from main board and not connected with no panel

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

it is possile that it wants the panel to be connected.. or it wants that the tcon be disconnected from main board and not connected with no panel

so, should I understand that it might not start if I don't connect the display??

yes ..but it hasn't happened to me with any LCD so far...but I'll try this too...

[vinceroger69]

Re: Samsung UE40KU6172U blanking problem!!??

yes..

usally when i get this fault it turns out too be a bad mainboard.

[nomoresonys]

Re: Samsung UE40KU6172U blanking problem!!??

with the mainboard hooked up, do you get the red light from optical port?

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

with the mainboard hooked up, do you get the red light from optical port?

yes... during the period when the LEDs are lit, it is also red...

[nomoresonys]

Re: Samsung UE40KU6172U blanking problem!!??

did you try it with one ribbon cable at a time hooked up from tcon to panel driver board, see if theres anything on display or any change, don't let the end of the loose cable touch anything such as metal chassis, don't want to short anything out. Best to do all connect and disconnect of cables with tv unplugged from power to avoid any errant surges and such.

[nomoresonys]

Re: Samsung UE40KU6172U blanking problem!!??

I think Vinceroger69 is right, mainboard issue.

[Davi.p]

Re: Samsung UE40KU6172U blanking problem!!??

i remember in some newer Samsung, with a problem in the panel it can go in protection

[lotas]

Re: Samsung UE40KU6172U blanking problem!!??

For this KU series - if the panel is not connected or the panel is not working, it will reboot, try turning off only the backlight and check if it will reboot.

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

yes...dear colleagues, the problem is solved...the display has been mounted and everything works perfectly...so, be careful with these newer Samsung models so you don't run after the defect like me...thanks for the ideas and let's hear the best

[nomoresonys]

Re: Samsung UE40KU6172U blanking problem!!??

ok, so the only problem was you didn't have everything hooked back up after the backlight replacement before you tested it, once all hooked up tv works as it should?

[KYBOSH]

Re: Samsung UE40KU6172U blanking problem!!??

yes...dear colleagues, the problem is solved...the display has been mounted and everything works perfectly...so, be careful with these newer Samsung models so you don't run after the defect like me...thanks for the ideas and let's hear the best

Happy to hear your TV is working.
I in the same boat as @nomoresonys ... what exactly was the problem and solution?

[peste]

Re: Samsung UE40KU6172U blanking problem!!??

ok, so the only problem was you didn't have everything hooked back up after the backlight replacement before you tested it, once all hooked up tv works as it should?

yes, the display had to be connected as well, otherwise the background light turns on and off, and so on.. I think it has a protection for working with a defective display.. so... without a connected display, the background light does not stay on..