philips 37" lcd blinks and wont turn on,,

[cadar21]

Hi..I have a Phillips 37PF9431D/37 LCD TV (37"). It quit working. Now all I get is a red blinking light (power). It starts green then it has one long red blink followed by two faster short blinks, then repeats the same cycle....

i googled the problem and all mi got is that it needs a firmware upgrade....
i downloaded the firmware...formated the usb to FAT 16...AND STILL NOTHING...
i opened the back and all the caps look good...

Do you guys have any suggestions...???. ( i also read a diode can be the problem bu t i couldnt figure out which one...)

[RON_CET]

Re: philips 37" lcd blinks and wont turn on,,

power supply check for open resistor location 3318 see attached image

[budm]

Re: philips 37" lcd blinks and wont turn on,,

So they updated that 100 Ohms 1/2 Watt high frequency surge limiter resistor to 470 Ohms 1 Watts for this capacitive power supply. I still use 100 Ohm but changed it to 1 Watts, still running for almost 2 years now. I may find the time to put in 470 Ohms instead if the resistor goes out again. Thanks for the info Ron. I knew it was a bad design when I saw the 1/2 Watts resistor.
http://s807.photobucket.com/albums/y...037PF9631D_37/

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

sorry my wireless signals been weak and havnt been able to connect,,,
RON_CET--- how do i check if its open...???

ive never had this type of problem come up when working on boards....ive been lucky and only had to replace capacitors....and the chips if a Sony XBR400 TV....

[Mr Bill]

Re: philips 37" lcd blinks and wont turn on,,

I would imagine if it's open it would read OL on your meter. What are you getting at location 3318? All the resistors i've ever seen that have failed read way high.

[budm]

Re: philips 37" lcd blinks and wont turn on,,

It should read 100 Ohms right now if it is good.

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

i think the battery on my meter is dead......shutts off after 5 sec.....
Dang..ill have to get back to you tomorrow after i buy a new 9v...

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

Sorry you guys ...my meters dead....it wont read anything...gives me 0.00000
ill have to post back when i by a good one....these Cen-tech voltage meter dont work well with me........

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

Just got to work on the tv today....
Mr Bill...I bought an analog meter....measured it at (x1K) and the resistor read off the scale...was crazy .... so i thought i messed up and i changed to ( x100) read - 2 - .
Then the tv turned on....weirdest thing...then i updated the software ( since the tv was working) turned off the tv like it instructed me to ... went to turn on the tv...SAME PROBLEM.... blinked the same code..
I reconnected the meter..at (x100) and it turned on again.... so watched tv for about 3 hrs... then i decided to inform you guys on my progress....

1. do you think the resistors just getting stuck...
2. can i buy that resistor at Radioshaq.??? i have no idea what to buy there are no readings on it..
and which one to purchase.

[budm]

Re: philips 37" lcd blinks and wont turn on,,

So you are using your analog meter which has low very low input impedance compared to the Digital meter while the TV is plugged in?

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

yes....

can you tell me if this resistor is a good by...
---- NTE 1W447-10 *** 1W 470K OHM Metal Oxide Film Resistor
Model:1W447-10 | Catalog #: 55047924

or this one
--- NTE 1W433-10 *** 1W 330K Ohm 2%
Model:1W433-10 Catalog #: 55049641

[budm]

Re: philips 37" lcd blinks and wont turn on,,

It should be 470 Ohms, not 470,000 Ohms.
By the way, be careful when probing around that circuit, it is in the Primary AC hot side, do not anything with your body's part.

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

Oh i see no k after the ohms.....
Are these ok... these are available through Radio shack-- i dont by online...
Which would be best...????
1..330 ohm 1/2W 5% ( i know it should be 1w )
2..470 ohm 1/2W 5%
3.. 680 Ohm 1W 2% ( is this overkill)
4.. 680K Ohm 1/2W 2%
5.. 330Ohm 1W 2%
6.. 500 Ohms 3W 5% Silicone-coated Wirewound Resistor

[budm]

Re: philips 37" lcd blinks and wont turn on,,

You can use 330 Ohms 1W.

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

Thanks budm.. ill order that tomorrow....

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

sorry for the wait.. i did ordered the resistor on the 24th... it should be here on the 30th...
so IL post back then...

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

is there a certain way to solder a resistor.... i dont want to install it backwards....

[Mr Bill]

Re: philips 37" lcd blinks and wont turn on,,

is there a certain way to sauder a resistor.... i dont want to install it backwards....

There is no "direction" for installing a resistor

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

great so it works either way.... i thought the color coding was a direction

[cadar21]

Re: philips 37" lcd blinks and wont turn on,,

Thanks for the help you guys.... i installed the new resistor last night... the tv turns on and worked great... i unplugged it for half an hour to make sure its ok.... plugged it back in...and is still working fine..... Left it plugged in all night and turned it on this morning and its perfect.....

So thank you all for your help.... ill post again when i need help.... and ill help those that need help by referring them to this site....