Philips 40PFL4707/F7B has sound, but no picture

[Antonino]

Hello,

I used this TV (Philips 40PFL4707/F7B) very little and is now out of warranty, and when I turn it on, the Philips logo flashes for an instant and then no picture, no menus, nothing. Sound works fine.

As recommended, i held a flashlight next to the screen and I could (barely) see the image moving. So I removed the back cover, and found there is one inverter board on the left side (many sites mention there should be two, but this one has only one). When I searched online, this is called a LED driver.

I replaced it (ssl400 0e2d) with a new one I purchased online, but the exact problem persists. So i will be returning it on monday.

Any ideas on how I should proceed? What could be the problem then?

thanks in advance for your help

Tony

[Antonino]

Re: Philips 40PFL4707/F7B has sound, but no picture

Anybody, please?

[tom66]

Re: Philips 40PFL4707/F7B has sound, but no picture

Could you supply a picture of the inverter and of the TV set's boards?
Does the backlight light or flash at all when you first power the TV up?
Do you have a digital multimeter?

[R_J]

Re: Philips 40PFL4707/F7B has sound, but no picture

I would check the voltages on CN3 on the led power supply (there are 4 test points marked led-1 to led-4) and see if they are all the same voltage when the tv is first powered on and you see the logo. if one ore more voltages is different, I would suspect one of the led circuits is bad.

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

Sorry to revive an old thread but i have the same problem
i probe the voltage at CN3

led 4 0volts
led 3 11volts
vcc go to 80volts and drop to 5 volts
nothing
led 2 11 volts
led 1 11 volts
vcc go to 80 volts and drop to 5 volts

I bought another led power supply on ebay and get the exact voltages.
If someone can help me, it could be really cool.
I wish to use this tv for my kids.

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

Does the backlight light or flash at all when you first power the TV up?
Yes, the backlight flash 1 sec and turn off

Do you have a digital multimeter?
yes!!!!

[budm]

Re: Philips 40PFL4707/F7B has sound, but no picture

LED #4 string has open circuit that is why you are getting 0V on the Cathode return pin.

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

so... i need to replace the led #4?
Its possible?
or... its possible to run it without this led ?

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

or maybe its possible to repair or bypass the problem on the led strip?

[vinceroger69]

Re: Philips 40PFL4707/F7B has sound, but no picture

This video will give you a rough idea on whats involved in changing a led strip or replacing just a failed led
https://www.youtube.com/watch?v=Bf5T...index=4&t=518s

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

really cool, ty vinceroger69

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

Ok, guys!
i found 1 burning led.
This is possible to buy only 1 led and replace it?
maybe i can pay someone here to sell me 2-3?
i found some complete stripes at 30$ on ebay... but... if i always prefer to give a second chance to my stuff.
Kids are wishing for a miracle, lol.

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

p/n is 2001sgs40 5630 60 h1 rev 1.0_core

[fettt]

Re: Philips 40PFL4707/F7B has sound, but no picture

I ordered 2 led stripes on ebay. Now.. lets wait 1month!!!

[ajshoe]

Re: Philips 40PFL4707/F7B has sound, but no picture

hopefully u bought new strips ?? my experience is by band-aid a burnt out LED
or replacing the bad one with a new one - it works but only for so long. Usually another one will bun out later. If keeping set - buy new strips and replace them all. Don't run the set on full brightness or you'll be replacing them again

[genuineguy]

Re: Philips 40PFL4707/F7B has sound, but no picture

do you have pictures of the LED strip in the TV ?