Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Okay, I installed a replacement main board also known as a SSB, I have instructions to Configure the SSB for the TV, I have good batteries in the remote transmitter and it shows it's working doing the digital camera test, so I followed the instructions but nothing happened with that...So now back to the TV Symptoms and voltage checks, etc. After replacing the main board I now get two green lights on that board that were not lit up on the old board, I also now get a white light where the standby and on lights are at the front lower right tv cabinet face/bezel..when I plug the tv in the backlights flash on for a second then go right back off, I don't have to push the on/off switch.. and here are the voltages on the Power Supply Rails/Connector pins. Pushing the power button on the tv has no affect but each time I push it the little white led power on light on the front goes off but then right back on.

Top connector CN4

-V Audio 13.04V
Ground 0V
+V Audio 13.75V
12V 12.52V
12V 12.52V
12V 12.52V
Ground 0V
Ground 0V
Stby .017V
3v3 Stby 3.268V


Bottom connector CN5

Analog/pwm dim .001V
Boost 2.6V drops rapidly to 1.09V
Dim 3.284V
BL On/Off 2.6V drops rapidly to .001V
Ground 0V
Ground 0V
12.3 V 12.51V
12.3V 12.51V

Looking at Post # 3 you can see pictures of the two Power Supply Connectors. I'M NOT SURE OF WHAT TO DO NEXT, the power supply board was replaced by someone else prior to them giving me the TV, I also posted earlier that the part number of this board is not exactly the same as what I think it should be.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Here's Pics of the the two different Power Supply Boards..the one on the right is the board the guy replaced in my Philips 47 LCD and the other one on the left is on ebay and it's supposed to be the exact replacement for my model TV...The only difference I can see is that there is one less mosfet on the board I have now compared to the other having 4, mine only has 3. this is on the longer heat sink close to the two 450V Electrolytic Capacitors. I also noticed my board has one less capacitor near the rail voltage/pin connectors.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Yes - well that board might be compatible - indeed the one you have might be as I thought you and others had decided it was a main board fault.

Anyway another aspect to conjure with is that in the top right corner on your board picture there are links depending on what the board was fitted to in your case a 42 inch Funai. As there are no pictures of the back of the board I dont know if the link is of any relevance to the working of the board or just for Identification.
IF it is relevant then perhaps moving it from Funnai 42 to Funai 47 might help
but I dont know enough about TVs to say. Perhaps Tom does or perhaps you can find more pictures.

I pulled the board and checked that, the jumper/link is just for identification, it doesn't do any connecting of circuits. Thanks for pointing that out.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Help, I'm also wondering if the used Main board I got could be bad,I hope not, see post 41.

One thing I forgot to mention is in measuring the voltage across the two 450v capacitors in the power supply I had 392 volts and that was the same with either the new or the old video board installed. with that voltage doesn't it mean the TV is actually on? I had the 392 V without pressing the power on/off switch. So maybe it is a power supply problem after all. Any reply with help is appreciated. Thanks!

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Not getting any help, I hope main board I just got is not defective, I only have 14 days from date received to return it by 12/27/12. I hope someone will post a reply of some kind back to me, I'm stuck with this TV and can't seem to go any further without help. someone? anyone?
Thanks

[JHOFFMAN]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Sounds like your inverter board(s) are bad. Normal symptom is the back light flashes on then off. Usually there will be sound with no picture. Sometimes you can see a picture if a flashlight is held at just the right angle shining onto the lcd panel. You should also get 24v going to the inverter board, check for a blown fuse on the board.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

OK, the two power supply boards you have. Do the two white connectors cn4. cn5 have the same labeling on them I.E.: 12V STBY, ETC. and the pins match each other?
This is power supply-inverter board combination, the inverter section uses 380~390VDC for driving the inverter transformer, it does not use 24V for typical inverter setup.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

The TV Comes on without me turning it on and I can't turn it off, I just replaced the main board (SSB) and now I have the 2 green lights on this replacement board, I didn't have them on the old board..when plugged in the first green light comes on, then the 2nd green light comes on and then lastly the screen lights up then goes black, tv stays on can't turn it off.. these sequences are about 1 second apart. the guy I got the tv from replaced the power supply board which is power supply and inverter all in one. I'm not sure he used the correct board but only one one website could I verify it should be correct.Now if I keep plugging and unplugging the tv it must sort of charge up the back lights, then I unplugged the T-Con board and plug tv back in watching the screen while it stays on 1 second at a time a message in the middle of the screen says "please plug in a usb device with the correct file, I think this is because I was unable to configure the SSB with the remote control, I will check the inverter section of the PS board. I think I will need to get a continuous display to configure the SSB.anything else you can tell me is appreciated. Thanks so much.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

""please plug in a usb device with the correct file" It sounds like the new board was not programmed correctly with the right firmware, that is why it is asking to install the correct one.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

OK, the two power supply boards you have. Do the two white connectors cn4. cn5 have the same labeling on them I.E.: 12V STBY, ETC. and the pins match each other?
This is power supply-inverter board combination, the inverter section uses 380~390VDC for driving the inverter transformer, it does not use 24V for typical inverter setup.

Bud, Unfortunately I don't have the old Power Supply Board, the guy I got the TV from said he didn't have it, I don't know what he did with it, I wanted to get it along with the TV.
but I have compared the different boards available and I'm almost sure they have the same connectors cn4 and cn5 labeled the same
Please go here and look, the board he put in the set ends in 0695, shopjimmy shows this model using 0692 or 0696. http://www.hdtvparts.net/products/38...t828a-phi.aspx

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

OK, from your post 41:
Top connector CN4

-V Audio 13.04V
Ground 0V
+V Audio 13.75V
12V 12.52V
12V 12.52V
12V 12.52V
Ground 0V
Ground 0V
Stby .017V
3v3 Stby 3.268V


Bottom connector CN5

Analog/pwm dim .001V
Boost 2.6V drops rapidly to 1.09V
Dim 3.284V
BL On/Off 2.6V drops rapidly to .001V
Ground 0V
Ground 0V
12.3 V 12.51V
12.3V 12.51V

The power supply is putting out the correct stand by voltages (3.3, 12v) but it does not receive the STBY signal (this signal may be there for second when you first plug the TV in?, monitor this pin to see if it change the state or not), the backlights did come on because it did receive the BL_ON for seconds, the the signal went away.
So please check the STBY pi to see if it does change state.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

""please plug in a usb device with the correct file" It sounds like the new board was not programmed correctly with the right firmware, that is why it is asking to install the correct one.

Bud please read this pdf file, I think this is why, I tried this several times with the remote but it doesn't work, I think the remote infrared receiver is not responding at this point. maybe there is a place to download the file and put on a usb flash drive and install that way but I will first need to keep the screen lit up with a display.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

That is why if you can tell me if the stby is there for seconds or not. I think we need to feed the STBY PIN and the BL_ON pins using the 3V power source through 500 or 1K resistors, the main thing is that you have to cut the wires that go to the STBY pin and the BL_ON pin first, this should make the backlights stay on.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

So did you find the two codes? Option code and the Screen Diversity code.

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

Monitoring the STBY it has exactly .017 volts when plugged in. and this voltage is consistent, then after unplugging power to the TV it actually rises gradually up to about .501 volts then gradually drops to zero.. Yes I do have both of the two codes, Option and Screen Diversity code.
I do have a 3 volt coin type battery that I can use on the STBY and BL_ON, Is it okay to use this one 3 volt source to connect to both of them at the same time? I can do this and cut the wires as you have said.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

OK, the negative of the batteries will go to the chassis, the positive will go the legs of the two 500 Ohms resistors ( you will tie each leg of the resistors together and then connect that tied end to the positive, the other end of the resistor, one end will go to the bl_on, the other goes to the stby pin, just make sure that these two signals wires are not connected to the main board.
By the way, your remote is putting out the signals?

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

I did exactly that, the resistors were both 600 ohm, the battery was at 2.7 v, this did nothing at all, no back lights or anything, and with the wires cut the main board did not have any of the green lights lit. so I wired it back together and checked it out and I have power back to the main board just as before.

My remote has 2 good batteries and I checked it by holding it up to a digital camera lens and watching the camera screen I could see that it is indeed putting out the signal.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

2.7V will be too low, or try 100 Ohms

[MisterD]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

okay, I will set up 2 new 1.5 v batteries in series to provide a good strong 3 volts, what is the possible different value of the two resistors I can use? will have to wait till tomorrow to do this.will the main board still function then? I will need it to see any display on the screen.

[budm]

Re: Philips 47" LCD TV.. Dead..Model # 47PFL3704D/F7

It should fire up the backlights and turn on the power supply, you should be able to see the message on the screen since we still have the rest of the cables still connected to the main board with the exception of the two signals wires. I will not understand why it should not come on, unless the STBY signal will have to be 0V instead of the 3V.
So also try without having the STBY pin connected to the resistor.