This is the 3rd TV today that has this issue..
Momentary flash of the backlights.. Display is fine, just not backlit..
My first instinct is that it's a bad backlight strip... But that hasn't worked out for me so well recently, so I decided to do some more checking before I break....er... break open another display panel..
Glad I did..
With my LED Tester, I was able to determine that the LEDs are good... I did some measurements on the Power PCB and the middle Inverter Board...
Let me see if I can map this out coherently..
On the Power PCB, the top 4 pins show 90V and the fifth one is marked NC... When the Power PCB is plugged into the Inverter Board, I get 55V on all 5 pins.. The 4 marked 90V and the 5th pin marked NC...
When I check the pins WITHOUT the Inverter Board plugged in, I get the 90V on the 4 pins marked 90V and 0V on the 5th NC pin..
I should note that the Inverter Board connector is marked 80V on the first 5 pins and shows 55V when the TV is powered up..
Does all of this indicate a bad or shorted Inverter board??
Momentary flash of the backlights.. Display is fine, just not backlit..
My first instinct is that it's a bad backlight strip... But that hasn't worked out for me so well recently, so I decided to do some more checking before I break....er... break open another display panel..
Glad I did..
With my LED Tester, I was able to determine that the LEDs are good... I did some measurements on the Power PCB and the middle Inverter Board...
Let me see if I can map this out coherently..
On the Power PCB, the top 4 pins show 90V and the fifth one is marked NC... When the Power PCB is plugged into the Inverter Board, I get 55V on all 5 pins.. The 4 marked 90V and the 5th pin marked NC...
When I check the pins WITHOUT the Inverter Board plugged in, I get the 90V on the 4 pins marked 90V and 0V on the 5th NC pin..
I should note that the Inverter Board connector is marked 80V on the first 5 pins and shows 55V when the TV is powered up..
Does all of this indicate a bad or shorted Inverter board??
Comment