Help with Toshiba (Best Buy) 55L621U

[imaddicted2u]

My friend dropped off his Toshiba (Best Buy) 55L621U for me to try to fix.
Here is a list of the measurements I took.
When first plugged in...
Toshiba splash screen is displayed then goes away after 6 seconds.
Power LED blinks 9 times, then goes off after about 45 seconds.
My friend said the right 1/3rd of the screen was green. I can't keep it powered on long enough to see for myself but the right 1/3rd of the splash screen is dark. Could the panel be bad?
LEDS on 6 seconds, Voltages on 6 seconds.
Nothing on flashlight test.
No response from remote or side panel button.
No difference with LEDs unplugged.


Video showing splash screen.
https://i.imgur.com/hJGyDop.mp4

Power connector measurements:
DIM = 1.6 THEN 0
5V1 = 5
BLON = 3.266 THEN 0.367
PWON = 5
ACD = 3.6
5V1 = 5
GND
16V2 = 16 THEN 0
GND
16VA = 16 THEN 0
GND
16V2 = 16 THEN 0


LEDs connector while lit:
LEDs to ground 135
LEDs to white outside LED1 = 83.5
LEDs to white middle LED2 = 72.5
LEDs to white inner LED3 = 115


C920 to ground 135 while LEDs on.
C601 across +/- 402 LEDs on 165 LEDs off.

[dskall]

Re: Help with Toshiba (Best Buy) 55L621U

I would say you have a backlight problem.

[imaddicted2u]

Re: Help with Toshiba (Best Buy) 55L621U

Thanks. You're probably right. I've never run into having bad leds and not being able to see the screen with a flashlight, never had one that shutdown the power supply but no matter, I was getting ready to take the panel out to test the leds and cleaned the screen and once it was wet I noticed a hairline crack right where the dark part of the screen starts. No point taking any screws out and proceeding further.

[Davegj78]

Re: Help with Toshiba (Best Buy) 55L621U

I know it's a old post but look at the right side of the screen it's dark. There's a short In the leds causing a 3rd of the screen which is 4 backlight strips short out and turn off