Re: Samsung UE40F6400AY relay sound and reboots continuosly


Yes, i agree too


I am not sure, because:
Please see attached picture (a few pages from magazine).
In red marked square is described under voltage protection Vdrv1. If is less than 18V The protection is activated, IC is switched off.
In yellow marked square is described over voltage protection for LED strip no. 1. If is there more than 87V The protection is activated, IC is switched off.
I think that google translator is not easy way in this case. I have found only...

Re: Samsung UE40F6400AY relay sound and reboots continuosly

Main PSU have to be switched permanently ON also without connected main board, but backlight have to be connected and 100% OK.

If you carefully checked LED strips an you are sure that there is no interrupted LED, no shortcuted LED on any strip, please skip next few sentences.

There are four separate backligt channels. First channel needs for feeding apr. 45V/270mA, next 3 channels apr. 90V/270mA. Last three channels are two the same LED strips as for first channel, but connected serially....

Re: Samsung UE40F6400AY relay sound and reboots continuosly

At first, i will put my answer from private message to keep continuity in my following answers:

[I].. it was a year ago...
Are you sure that problem is in The IC? Did you exclude rest of TV? (main board, backlight strips, power supply itself?

Those IC's are for Led strip current source, bright regulation, uver-current and over-voltage protection only.

I eliminated signal "output protection" from first IC, afterwards from second IC. In my case, PSU stop click...

Re: Samsung EU40F6400 power cycling

I had the same problem. In my case was broken SLC2013M IC. Replacement of IC9101 problem solved, the TV works now.

Re: HP ZR2740w almost dead

Thanks for answer. I found similar circuit diagram with MTV416GMV IC also, (service manual from other brand of monitor), but as you wrote also, there are ports used to others functions.

When I switch-on mains without connection to NB, I have no info on screen (NO SIGNAL or NO CABLE CONNECTED or similar message on screen). Display is completely dark, without backlight also. After a few seconds blue status LED is changed to amber..that is all. According to my experiences, there should be any message on screen about missing signal on screen....

Re: HP ZR2740w almost dead

Hello. I have got also HP ZR2740W with no background light.

When i switch on mains, status LED goes to blue, after a few seconds to amber. It seems all OK, because i have no connection to PC. But i have no background light. I have got on P803 +5V on all 5V pins, 0V an +12V pins, 0V on pins 2,3 and 2,1V on pin 1.
According to hints above i pushed up pins 2 and 3 P803 (with 820 ohm resistors) to +5V and background light appears.
I found, that signal for pins 2 comes from IC U12 - Myson MTV416GMV, pin 26 and signal for pin 2 from...