I am slowly accumulating a pile of Samsung LCD's with fairly similar main/video board problems. The latest is a 710N. Powers up with green LED, which disappears after 6 seconds. As this is driven by the micro it ?confirms micro activity. The video chip has a 12MHz crystal, and the SM shows it driving the micro oscillator. Apologies for the dodgy pic.
There are NO reset chips. The micro outputs a reset_scaler signal to the video (scaler) chip. (The micro is an NT68F63L.)
The VGA sync signals are fed to the micro, so it appears that it fails to detect a signal, gives up and goes into sleep mode.
All voltages are good. No video is presented to the screen. Forcing BL_EN gives a well-lit screen. Hitting the MENU button gives a "test good" message box
Stumped.
There are NO reset chips. The micro outputs a reset_scaler signal to the video (scaler) chip. (The micro is an NT68F63L.)
The VGA sync signals are fed to the micro, so it appears that it fails to detect a signal, gives up and goes into sleep mode.
All voltages are good. No video is presented to the screen. Forcing BL_EN gives a well-lit screen. Hitting the MENU button gives a "test good" message box
Stumped.
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