Hi folks another doozie here,
Got this TV on my table this week and at first suspected a simple failing LED on the back lights as symptoms where backlight coming on at power up and within a few minutes flickering then failing other than that TV works fine.
This set is side lit and noted sometimes the flickering would start right away even during boot, after testing found backlights + inverter good. To cut a long story short found that applying pressure to specific spot on mainboard heatsink caused backlights to come on or off and even moving chasis about caused this other than that the TV works fine!
Initially thought a short to chasis or maybe bad cable between MB and PSU but lifted mainboard up and found pinching with fingers between back of board and heatsink in specific spot caused the lights to come on as pressure applied.. There is nothing really under the heatsink in this spot certainly nothing touching the heatsink and so wondered if CPU was needing reball, tried that and now have killed the backlights totally lol but the mainboard still works fine just mainboard appearing to not be sending the on signal.
Any takes on this mystery i really could use the pin outs for the mainboard at least to id the inverter on signal, schematic would be awsome is it about anywhere?
Cheers in advance CJ
Below is photo of mainboard with heatsink removed
1-981-326-12 (173633712) Main Board
Got this TV on my table this week and at first suspected a simple failing LED on the back lights as symptoms where backlight coming on at power up and within a few minutes flickering then failing other than that TV works fine.
This set is side lit and noted sometimes the flickering would start right away even during boot, after testing found backlights + inverter good. To cut a long story short found that applying pressure to specific spot on mainboard heatsink caused backlights to come on or off and even moving chasis about caused this other than that the TV works fine!
Initially thought a short to chasis or maybe bad cable between MB and PSU but lifted mainboard up and found pinching with fingers between back of board and heatsink in specific spot caused the lights to come on as pressure applied.. There is nothing really under the heatsink in this spot certainly nothing touching the heatsink and so wondered if CPU was needing reball, tried that and now have killed the backlights totally lol but the mainboard still works fine just mainboard appearing to not be sending the on signal.
Any takes on this mystery i really could use the pin outs for the mainboard at least to id the inverter on signal, schematic would be awsome is it about anywhere?
Cheers in advance CJ
Below is photo of mainboard with heatsink removed
1-981-326-12 (173633712) Main Board
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