Toshiba 40L1555B Green LED flashing nonstart

[satinser]

The Green led is flashing over the red standby led no picture no audio. Have disconnected led backlight connection from psu and control board connection from main av board so just the power board and main board are connected still the same with green led flashing over red standby led. Anybody any idea which is most likely to be at fault? Boards used are PSU Vestel 17pw07-2 and Mboard Vestel 17mb95s.

[tom66]

Re: Toshiba 40L1555B Green LED flashing nonstart

green/red is PROTECT fault can be bad firmware or bad power supply.
check power supply voltages - any missing? If it's firmware it won't ever fire up the voltages due to it not turning on PS ON (STBY ON/OFF) so check that.
it is possible to reload the firmware on these with USB memory but you need the correct firmware.

[satinser]

Re: Toshiba 40L1555B Green LED flashing nonstart

Thanks for info Tom. Main board is definitely giving on command to psu. Difficult to test all voltages and what they should be not got circuit diagram and not showing on vestel boards what they should be. Do you know what voltages should be from led connector to panel?

[tom66]

Re: Toshiba 40L1555B Green LED flashing nonstart

PSU schematic has voltages

[satinser]

Re: Toshiba 40L1555B Green LED flashing nonstart

PSU schematic has voltages

Thanks Tom very helpfull have now ordered a mainboard.

[satinser]

Re: Toshiba 40L1555B Green LED flashing nonstart

Just to finish this thread in the correct way. Replacement main board fixed the fault. Original main board for some reason wasnt sending backlight on voltage to psu.