Hello everyone, I have this Samsung LN55C630 TV which upon being plugged in attempts to power up but fails. The backlight turns on for about 3 seconds during which the screen is usually black but once in a while it shows some glitched imagery with widely spaced vertical lines, and then turns off for about 8 seconds before repeating. The red LED on the front of the panel is blinking, but it also responds to inputs from the front touch buttons like say pressing Vol+ will make the LED blink rapidly.
I found that disconnecting the mainboard connector (C201) to power board connector (C802) forces the CCFL backlight to stay on indefinitely which means at least the backlight and backlight driving circuitry seems to be working.
I probed connector C802 while it was power cycling and found the following voltages:
I found some users reporting with this model that cutting jumper J854 on the power board resolves a bad strobing or flickering issue so I decided to cut it on mine but it did not change anything.
I also attempted to plug an HDMI source into all the inputs but was not able to get an image on the screen while it's stuck in this loop.
I'm leaning towards T-CON at this point but still have some uncertainty.
I found that disconnecting the mainboard connector (C201) to power board connector (C802) forces the CCFL backlight to stay on indefinitely which means at least the backlight and backlight driving circuitry seems to be working.
I probed connector C802 while it was power cycling and found the following voltages:
I found some users reporting with this model that cutting jumper J854 on the power board resolves a bad strobing or flickering issue so I decided to cut it on mine but it did not change anything.
I also attempted to plug an HDMI source into all the inputs but was not able to get an image on the screen while it's stuck in this loop.
I'm leaning towards T-CON at this point but still have some uncertainty.
Comment