Blaupunkt 49/235z, got this TV described as sound no picture, had a quick look, and backlights came on at first, but the LED inverter was buzzing very loudly, left TV on and after around 20 mins the backlights went out. Turning TV off and back on would bring them back on for a while but always went off sooner or later.
I stripped the TV right down, tested the LED strips, both as strips and single LEDs and all of them illuminate with tester.
I took readings from PCB for LEDS, which were
LED+ 231v (when backlights were illumiated)
LED+ 132v (times when LEDs had gone off)
As mentioned when LEDs where illuminated, the inverter was very noisy and loud, when the LEDs wont come on, this is silent.
Other readings from PCB are -
+12v 12.40v
SGND
+5v 5.21v
+5vSB 5.22v
PSON 4.38v
SGND
+12v 12.40v
BK 5.19v
ADJ 4.66v
SGND
I stripped the TV right down, tested the LED strips, both as strips and single LEDs and all of them illuminate with tester.
I took readings from PCB for LEDS, which were
LED+ 231v (when backlights were illumiated)
LED+ 132v (times when LEDs had gone off)
As mentioned when LEDs where illuminated, the inverter was very noisy and loud, when the LEDs wont come on, this is silent.
Other readings from PCB are -
+12v 12.40v
SGND
+5v 5.21v
+5vSB 5.22v
PSON 4.38v
SGND
+12v 12.40v
BK 5.19v
ADJ 4.66v
SGND
Comment