Philips 47pfl5704d/f7 Added Pictures

[kmab]

Philips 47pfl5704d/f7 no picture, no sound, stnby light (1) long and (4) short blinks... Visual of power supply looked OK.. Any ideas ??... Also need service manual... thanks

[budm]

Re: Philips 47pfl5704d/f7 Added Pictures

http://elektrotanya.com/?q=showresul...at2=schematics

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

another picture of the power supply where the CN4 and CN5 connectors are. So we can read the pin outs.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

cn4 cn5
-v audio analog/pwm dim
gnd snd boost
+ v audio dim
12.3 bl on/off
12.3 gnd
12.3 gnd
gnd 12.3
gnd 12.3
gnd
stby
3v3 stby

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

First off what voltages are you getting on these pins.Use the pin out description with the voltage you measured beside it. We got to find out if the issue is on the main board itself or on the power supply. See what you get TV on vs TV off.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

soon as tv is plugged in stby light starts flashing (1) long (4) short, No on/off..

cn4
-v audio, 0vdc
gnd
+ v audio, 0vdc
12.3, 0vdc
12.3, 0vdc
12.3, 0vdc
gnd
gnd
gnd
stby, 3.3vdc
3v3 stby, 3.3vdc

cn5
analog/pwm dim, 0vdc
boost, 0vdc
dim, 0vdc
bl on/off, 0vdc
gnd
gnd
12.3, 0vdc
12.3, 0vdc

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

With the ribbon cables disconnected on CN4 and 5, measure stby and 3.3V stby pins on CN4.
After that you could "force" the PSU on using a two 1k ohm resistors. One from the standby voltage to PSon and the other from standby voltage to BLon. This should bring up all voltage rails and the backlight.

I tried to DL that schematic, but everything is slower than molasses here today.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

cn4 and cn5 cables disconnected, 3v3 stby=3.3.vdc and stby=2.6vdc

Need clarification on 1k from stby to PSon... stby or 3v3 stby and which pin is PSon.. is this done with cables connected..

Thanks

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

3.3V Stndby = Standby power from PSU to main board.
Standby = PSon is from main board back to the PSU to tell the PSU to turn on. Same as the BLon. That comes from the main board and tells the PSU to turn the back light on.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

is this correct

1k from standby to 3.3v standby
1k from standby blon

cables disconnected

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

CapLeaker - did you stop posting ???

[budm]

Re: Philips 47pfl5704d/f7 Added Pictures

"1k from standby (PS-ON) to 3.3v standby = OK
1k from standby blon = wrong, it is 1K between BL-ON and 3.3VSTBY.

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

CapLeaker - did you stop posting ???

Sorry... no... I guess the thread moved fast down and I am kind of busy with little crap that needs to be dealt with. Some days I have more time than others. Not easy having 4 kids home

I thought it was clear to use the 3.3V standby voltage, as I explained what the standby (PSon) does.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

thank you for your replies.. did not mean to have two threads on the same tv just my inexperience on this forum.. i apologize...

cn4 & cn5 disconnected at main board
1k from stby to 3.3v stby
1k from 3.3v stby to bl-on

back lights did not power on...
no 12.3vdc
stby= 3.3vdc
3.3v stby= 3.3vdc

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

O.k. I guess we have trouble with the PSU not firing up. I DLed the service manual on here, but for some reason I can't read it. Schematic is too blurry. I guess we got to find another one.

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

I found another service manual, but it didn't include the schematic for the PSU
Shopjimmy has had a repair kit for that board and they replaced following:
Transistors 5 Q101, 501, 601, 602, 603
Integrated Circuits 4 U101, 401, 501, 601
Diodes 3 D301, 601, 602
Capacitors 1 C102
Fuses 2 F101(37'), F101(47")

Gives you something to do.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

since we thought the ps may be bad did a little more experimenting.

stby to gnd
3.3 stby to bl-on

Back lights ON
12.5vdc where specified
power supply good

question - this would indicate main board bad...
checked on shop jimmy and they state a new board needs configuring..
what does configuring mean ???

thanks

[budm]

Re: Philips 47pfl5704d/f7 Added Pictures

So it is active LO for the PS-ON.
Best is to ask SJ exactly what is involved to do the configuration.

[CapLeaker]

Re: Philips 47pfl5704d/f7 Added Pictures

Since the PSon is backwards in the power supply and it does fire up, I guess the problem is on the main board that controls the PSon. Maybe that transistor is bad that pulls the STBY or PSon to GND.
What you could do is maybe to put the TV back together, take the PSon wire off the PSU (in order that it doesn't backfeed to the main board) and short the PSon pin from the PSU to GND. The TV should come alive.

[kmab]

Re: Philips 47pfl5704d/f7 Added Pictures

Tried last suggestion: cn4 & cn5 reconnected, PSon (stby) to ground..
led on front panel blinks four times and repeats tv does not power up..
Guess we will look for a new main board, Shop Jimmy is out...