Philips 32PFL3008H/12 bad backlight

[d4vidb]

Hello, I'm repairing Philips TV which has Vestel 17IPS19-5p power supply. So far I replaced 400V MOSFET, diodes and MP3394 and TV started to work again but with very low brightness and I only see the picture in the dark room.
Voltage across the LED is around 50V which is not enough I guess?
What should I check? Capacitors are OK, so I don't know what else to check.

[ngth82]

Re: Philips 32PFL3008H/12 bad backlight

Please post clear pics of the boards.

What happens if you test the backlights with a backlight tester?
What is the voltage output of the LED driver pins?

I ask because i've seen LED strips that appear much dimmer compared to the strip next to it. Some of the LEDs have probably gone bad and requires a lot more current to get them to full brightness. Time to replace the LEDs or get a new panel strip.

-Thomas

[snowfun]

Re: Philips 32PFL3008H/12 bad backlight

hi,
I have a silimar case and my fault was ic driver MP3394, the voltage was low and image very dark.
You need make a test with the led bars first 50v is low (for example: in 32" tv backlight have 2 bars with 11 leds , well 11x3v =33 x2 = 66v



Regards.