TCL - L50E3020FS not turning on

[Amraks]

Re: TCL - L50E3020FS not turning on

here are some voltages off that inverter.

VBL 23.97v
VBL 23.97v
VBL 23.97v
VBL 23.97v
VBL 23.97v

ERR 5.447v
BLON 3.26v
E_PMM 0.894V

Measured this at the capacitors going into the positive side of the LED connectors.
C96 23.74v
C95 23.73v

[budm]

Re: TCL - L50E3020FS not turning on

here are some voltages off that inverter.

VBL 23.97v
VBL 23.97v
VBL 23.97v
VBL 23.97v
VBL 23.97v

ERR 5.447v
BLON 3.26v
E_PMM 0.894V

Measured this at the capacitors going into the positive side of the LED connectors.
C96 23.74v
C95 23.73v

No boosted Voltage at the moment.
Keep the meter probes on the Plus and minus legs of C95, then turn on the TV to see how high the Voltage jumps up to before settling down to 23.74V.
There two fuses (F1, F2) on that LED power supply, are they OK?
The ERROR Voltage may be the clue to the problem in the backlights circuit or the LED, but I do not know if 5V is normal or <1 V is normal for the Error signal.

[Amraks]

Re: TCL - L50E3020FS not turning on

C95 voltage spikes to 44.0v then settles to 30.v then goes to 23.74v
Them fuses are also fine

[budm]

Re: TCL - L50E3020FS not turning on

So it looks like boost converter goes into shutdown mode. This panel has 8 LED strings so it can be that one or more is bad, You will have to check the Voltage at each one of the VLED- pin each time when you turn on the TV to see what you get on each pin, so leave the meter black probe on the chassis and red probe on VLED- one at time them turn on the TV while watching the meter to see what the Voltage jumps up to and goes down to after 5 seconds on each one of the eight VLED- pins.

[Amraks]

Re: TCL - L50E3020FS not turning on

So it looks like boost converter goes into shutdown mode. This panel has 8 LED strings so it can be that one or more is bad, You will have to check the Voltage at each one of the VLED- pin each time when you turn on the TV to see what you get on each pin, so leave the meter black probe on the chassis and red probe on VLED- one at time them turn on the TV while watching the meter to see what the Voltage jumps up to and goes down to after 5 seconds on each one of the eight VLED- pins.

Sorry what kinda results am I looking for 0.800v spiking to 13v?

[budm]

Re: TCL - L50E3020FS not turning on

Sorry what kinda results am I looking for 0.800v spiking to 13v?

Looking for the result of each LED string readings.