Samsung UN50EH5300 - No Standby LED, Backlights ON, No Power

[nathan425]

Hello, I have a Samsung UN50EH5300 in my possession that I'm looking to bring back to life.

Symptoms:

• - no power
• - no standby LED

What I've done so far:
- confirmed power supply is OK
-- CN201 #4 showing 5.3V
-- BD207 showing 5.3V
-- removing the cable between the main board and the power board turns on the backlight.

Pushing the power button on results in no change to any of the pins connecting the two boards.

- function assembly appears to be NO GOOD
-- there is no voltage showing on any of the command pins. the diagnostic manual states that all pins should read 3.3V before commands.
-- if I turn my DMM to resistance mode, i can get the LED to light up when placing the probes on both ends of the LED.


My question is how can I verify whether it's the function joystick or the cabling that is the problem? Some of the part numbers online include the cabling but my unit is combined with the WiFi module on the bottom row which is not included in the parts online. Is there a way to jump-start the boards and tricking them into thinking a power on signal has been sent?

The troubleshooting workflow doesn't include checking the function assembly as part of the diagnostic so it's not clear if this is the solution.

[karthur]

Re: Samsung UN50EH5300 - No Standby LED, Backlights ON, No Power

Nathan,
You mentioned you have a service manual for your TV. I have a UN60EH6000 I am trying to get going. Thought that maybe that service manual you have also covers my set. Could you send it to me?

Thanks