Philips 32PFL4901/F8 BA5DFGG0201 1 Backlight is present but no image

[alro7779]

Hello there!
Have this Philips with no image at all. When I plug it to the outlet, it turns on without pressing the power button, and after a moment, it turns off, then starts again. I checked the 12v and 3.3v voltages on the main board connector that goes to the T-con, but it only has the former (12v). Any clues, guys?

[alro7779]

EDIT: When I disconnect the T-con flex cable, the turning on and off loop continues. Can it be a problem with the main board?

[alro7779]

EDIT: The power supply is sending 21v, 12v and 3.3v to the mainboard, but the latter just sends 12v to the T-con.

[alro7779]

EDIT: Now when I press the power button, it does not turn on. Checked the voltage on the connector that goes to the control panel, and there is 3.3v, but it doesn't respond when I press the power button. What could it be this time?

[lotas]

So where will you get the image, if your LVDS cable is damaged, replace the cable and check if something has not been shorted or damaged by a non-working cable.

[alro7779]

Thanks for your response!

The problem started before having the LVDS cable damaged. However, I know I do need to replace that 30-pin ribbon cable. However now I'm dealing with this new issue... it does not turn on (no standby light nor backlight). I've found a shorted diode on the primary side of the power supply, next to a mosfet. Checked the leds with a tester and they do light on; 44 volts shows the tester and I remember getting only 21 volts on its connector after pluggin' it in to the outlet.

PS.- I'm trying to find the schematic of the power supply. The model number is BA4GF0F0102 2 (only found a similar one... the BA3AF0F0102 1)

Cheers!

[lotas]

I'm trying to find the schematic of the power supply. The model number is BA4GF0F0102 2 (only found a similar one... the BA3AF0F0102 1)

Cheers!

BA4GF0F0102 2

[alro7779]

Thank you a million times for the schematic, man! 😀
By the way, is there a section here for schematic requests?
Cheers!