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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, any pattern/sequence to the blinking? Was the blinking a result of changing anything while in Service Mode?
Still, would the blinking start immediately upon plugging back in? ...or only after attempting to turn on?
"...any pattern/sequence to the blinking?..."; something like ...5 blinks...pause...5 blinks...pause...5 blinks...pause
Appreciate the additional information.
If all external factors have been checked and ruled out, then the described symptom and "...power light blinking... 1 blink every second..." almost always indicate that the TV is kicking in auto-protect mode due to an to an internal hardware issue.
The above would require that the unit be opened up for visual inspection, voltage/continuity/resistance checks, confirm faults and effect repairs.
Based on this:
Great on the DIY!
Please post back with clear pictures of the back of the TV showing the different boards. This would serve as common reference/
Appreciate the pictures.
The Service Manual stipulates that the 1-blink error code as a "Lamp Failure"
The only doable check is to determine the presence and consistency of the power supply voltage to the inverters and the inverters high frequency/high voltage output supplied to the lamps.
The above is actually a test by process of elimination.
Voltages would be from the 3-pin connector of the power supply board to an inverter. The voltages would be +60V and +10V.
Yes, that would be pressing simultaneously the TV's CH▼ and the VOL▲ while plugging back in.
But still, the voltage readings would be necessary to pinpoint the most likely suspect.
Per SM yes; and the exact values would be relative.
If the power supply is able to provide the +60V to power the inverters, then it would be good.
Next check would be for the high frequency/high voltage output supplied to the lamps.
Sorry but not familiar with the "... jumping capacitor c7558 will bypass error code..."
Please post back how you would want to approach this and/or should additional information be needed.
The voltages would be present momentarily hence would be able to check its presence. The blinking would indicate that it has kicked in auto-protect mode. and the voltage should be cycling.
Try disconnecting the inverter boards 1 at a time and determine if the blink code would change.
Likewise, the +60V may then be consistently available if the PSU is good.
Very significant findings and observations as it would appear that the power supply and the inverters are all working as expected.
On this particular model, I am inclined then to suspect the likelihood of a failing CCF lamp based on the above.
Sorry but no tests that I am aware of.
The only test can be for the (even momentary) presence of the inverter's high frequency/high voltage output supplied to the lamps would be with the use of a neon bulb tester very close but carefully to the inverter's transformers.
As posted above, by process of elimination, if present would point to the lamp(s).
And to my recollection, the lamps are embedded into the LCD panel hence in most instances, this would require replacement of the whole panel.