CN301 Powered Off:all are 0.00v except pins 2,7,8,9 these are 0.05v
CN302 Powered on Powered off
CN303 powered on Powered off
I know pins 1 on CN303, 1 on CN302, & 7 on NC302 are all low voltage or 0volts which control the backlight circuits. My question is do these voltages come from the power supply or are they returned to the power supply board from the main or A board?
Any help would be greatly appreciated. I have ordered a power supply but wanted some others opinions as well.
You have to send your old board in as a core.
Hi, Sorry for reacting on the old thread. I'm having the same model, same symptoms and similar voltages on pins as posted by Jim. But I noticed the there is also voltage (-57V) on the two large heat sinks of the G-Board (power board). Is this normal and expected or or is it a sign that G-Board is bad too?
Anyone has a documentation or is willing to measure it for me? Btw mine G-board is 1-857-093-41 and A-Board 1-857-092-41.
Based on some thread I did did run a test with CN303 unplugged. With this backlit turned on and screen showed RED-GREEN-BLUE cycle pattern. The voltage on BL-ON pin was something about 5V. Once I plugged CN303 back in the backlit went off.
I guess the G-BOARD and Inverter (or Distribution board) are ok since I got the pattern displayed. And I suspect the problem is with A-board. But I do not like that voltage on the heat sinks...
Should I order A or G board or both?
I know some people do rebuild these boards. Is there a typical failure point on these boards? I can try to measure ESR on some capacitors but they look visually fine...
Thanks for your help!
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