Re: Sony Bravia 40S4100 - Replacement Board Has Same Issue - Factory Reset Maybe?
I unplugged both speakers at the A board, toggled power ON, no backlight. Removed connector CN303, still nothing. Tried again without TCON, still nothing.
I also tried disconnecting the indicator lights/IR detector and buttons on top of the set with the speakers still disconnected, removing CN303 after power ON each time.
I need to go through everything again from the beginning and revisit some assumptions/interpretations, probably not before the weekend....
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Sony Bravia 40S4100 - Replacement Board Has Same Issue - Factory Reset Maybe?
The shorthand version:
TV was broken when I found it. No backlight, sound, or picture. BL_ON stays low regardless of power state. Disconnecting CN303 (the cable that includes BL_ON) shows 5.3V for BL_ON on the power board and BL_ON never changes state on the "A" board. BL_ON is 150 ohms to ground on the A board, which I'm assuming is not a short. All 15V, 12V, 6.5V, and 3.3V secondary voltages are present. The replacement board ordered from a business online does basically the same thing (difference explained in the questions below). Arrived in a heat-sealed plastic bag...
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