Re: Samsung LA55B650T1F 55" TV Won't power on

It lives again!
After I measured the current drawn by the main board via a current limited power supply, I must have made a mistake. I repeated the measurements and checked again. This time, non of the voltages fed to the main board drew more than they should. Not sure how I goofed up the first time. This time they were all well within limits (5.3v stby 30ma, 18v 0ma, 5.3v 800ma and 13v 630ma). Thus I began to suspect that the main board wasn't the cause of this current overload on the power supply. I could not find a circuit...

Re: Samsung LA55B650T1F 55" TV Won't power on

Hi, thanks..
I have measured the resistance on all the voltages to the main board and none of them are shorted. Most are more than 200ohms..
I then used a current limited power supply and checked each voltage to the main board separately..
The 5.2v Stby should not draw more than 0.2a. It drew about 30-100ma
While feeding the 5.2v stby I used the remote to power on and measure the PS voltage. It goes from 0v to just over 2v and then down again.. Seems to be fine..
Then I tried the 5.1v current...

Hi, I have a Samsung LA55B650T1F tv which died i.e. the red standby light went off when turning it on and it never came on again. I've disconnected the AC and left it overnight and reconnected it. Upon pwr on, it doesn't come up. I can sometimes see the leds on the ethernet connector flicker faintly on/off and then nothing.
So, after opening up the tv, I did a visual inspection of the power board, connectors etc. All looked ok. I have checked all the electrolytes with an ESR meter and checked their capacity out of circuit and they are fine.
When disconnecting CN801 between power...

Re: New Members - please post your introductions here

Hi I'm Simmi in sunny oz.. I do have electronics training from way back, in the day's of analogue tv's and vacuum tubes. Also did a fair bit of digital stuff. I joined IBM in the late seventies as they were recruiting service engineers with electronics background. It was in the days when computers needed electronics engineers to fix computers. Gradually over the next decade, all the repairs went to module replacements highlighted by diagnostic software. No more electronics knowledge required. I still like to repair my own stuff...