Philips 32PFL5404 wont turn on -> status led blinks twice

[Davidcoolman]

Dear all,
I'm trying to fix a Philips 32PFL5404 tv that wont turn on.
It only does a status led double blink each 3 seconds over and over.
I changed the psu which shoed obvious signs of overheating by a new one from the bay (model PLHL-T708A) but nothing changed at all.

I am willing to think the new psu is ok so the problem sould logically come from the ortherboard that handle graphics, inputs-outputs, etc...

Thanks by advance for your tips
Davidcoolman

[budm]

Re: Philips 32PFL5404 wont turn on -> status led blinks twice

Can we get the pictures of the whole backside of the TV so we can see all the boards and how they are connected together?

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -> status led blinks twice

Dear budm
here a pic of the whole tv. don't hesitate to ask more information.

[budm]

Re: Philips 32PFL5404 wont turn on -> status led blinks twice

Thanks for the pictures, please add the closed up pictures of the power supply/inverter board combo, I need to see if there are any labels for the pin of those two white connectors (between the power supply board and the main board) on the power supply board so we can see what Voltages are missing.
BTW, please see if it has chassis number printed on the model number tag. The service manual I found does have have the same power supply as yoursand the numbers as printed on the barcode sticker on the power supply board.

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -> status led blinks twice

On the labels are written expected voltages
should i masure them? with or without connecting ribbons?

thanks for the link, will try to make an account... failed last time.

[budm]

Re: Philips 32PFL5404 wont turn on -> status led blinks twice

With the connectors in place, take the readings when the TV is off and when the TV power switch is activated, please also make sure to put the pin's name next to the reading so I can easily see what Voltages are missing.
For example:
CN5:
+12V: TV OFF = 0.0Vdc, TV ON = 12.00Vdc

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -> status led blinks twice

Dear all,
late reply caused by tons of work.

Since the tv doesnt actually have a switch it is pemantly in standby. I could measure voltages without the ac line connected but it doesn't make sense right?
so TV "on"
CN5:
DIM 0.26Vdc

CN4:
3V3Stdby 3.24Vdc
Standby 3.24Vdc
+Vsnd 0.55Vdc

all other rails are <0.1v ( guess its noise/caibration issues)

[budm]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

TV OFF (standby) = TV is plugged in but power switch is not activated, so we need ALL the Voltage readings of ALL the pins, then you activate the power switch and then take the same readings again.
So from the way it looks right now, the main board is sending the PS-ON (Standby) signal (3.24VDC) but the power supply is not doing any thing, only the standby power supply is working.
BUT we need to verify if the PS-ON (STANDBY) Control Voltage is active LO or active HIGH, that is why I ask for the Voltage reading when TV is OFF and when TV is ON.

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Dear budm

I measured voltage on the "off" i.e. standby mode and while holding on button wich yielded similar results. Actually the proble is the tv set won't turn ON and halts somewere in selftests, infinitly (hopefully not) stuck in standby
It is WEIRED that NC (not connected?) pins actually oscilate from -0.1 to 0.1Vdc while ground pins give a steady 0 so its not my DMM that acts weired so i imagine that it's some parasitic current

Here the readins I got (same while pressing on):

CN4
NC: 0.1Vdc -> -0.1Vdc
C201 GND SND: 0 Vdc
+Vsnd: 0.5 Vdc
+12V: 0Vdc
+12V: 0Vdc
+12V: 0Vdc
GND1: 0Vdc
GND1: 0Vdc
GND1: 0Vdc
Standby: 3.24Vdc
3V3 Stdby

CN5
GND1: 0Vdc
NC: 0.1Vdc -> -0.1Vdc
NC: 0.1Vdc -> -0.1Vdc
INVOK: 0.06Vdc
NC: 0Vdc
Boost: 0.03 Vdc
DIM: 0.26Vdc
OL_ON_OFF: 0.07Vdc
GND1: 0Vdc
GND1: 0Vdc
+12V: 0Vdc
+12V: 0Vdc

[budm]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Service manuals:
http://elektrotanya.com/?q=showresul...at2=schematics
NEVER MIND, the manuals do not match your chassis.
Can you look at the model number sticker on the back of the TV to get the chassis number?
The link I give is for chassis TPM3.1E LA which is not what you have.
I still cannot fond the info of the model PLHL-T708A power supply/inverter board either.
OK, you provide the wrong part number of the board:
Power Supply Board PLHL-T808A:
http://www.shopjimmy.com/philips-272...t-inverter.htm

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Here the back sticker, can't really tell chassy number



any thougths about my poor tv?

[budm]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Q543.1E LA:
http://elektrotanya.com/?q=showresul...at2=schematics

I hope one of them will match your TV.

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

PM'ed you

[budm]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

OK, no problem.
This is what I found, the STANDBY (PS-ON) is active LO (LO = ON) and right now he main board is not sending the signal to turn on (the Voltage is stuck HI, Standby: 3.24Vdc per your reading) the rest of the power supply.
So something on the main board or something is telling the main board not to send out the signals.

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Ok so something really is preventing start...
Where should i start my investigations?what about this Led code? does it tells us something.
Something else : i must assume psu is ok since it was bought as new and working on the bay but it gave similar results than with the old "fried" one: makes me think something is wrong on another board, putatively the one That handles video, why not the ccfl tubes?
I had some results testing mosfets in the past since they are also prone to failure...

[budm]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

You need to trouble shoot the main board which is very complex.

[Davidcoolman]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Ok thanks for ur help budm
So i m tonna deal with a mainboard failure. Any one willing to help?
I m pretty sure it could serve other as well.
Nobody has previously delt with the 20p4s107c0 board?
I already spent half the money of a new tv on this power supply. I m not giving to give up now!
Thanks for feedback

[Matro]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

Hi, i've an identical issue with my 32PFL7694; The main led blinks twice forever.
Has someone found a solution? The mainboard looks like the one posted here!

[dra6an]

Re: Philips 32PFL5404 wont turn on -&gt; status led blinks twice

https://www.youtube.com/watch?v=JbOECQcJ2_Q