Phillips 37PF5521D dead after power cut

[flocko]

Need your help, after a power cut Tv no longer does anything, no standby light or anything.
Power board 3104 313 60822 and standby board 3104 313 60643 I have looked through several posts and it appears that these are common boards. So far I have changed 2 450 volt 10uf caps, 2 25 volt 100uf caps and a 50 volt 10uf on the standby board, and have changed 25 volt 680uf the 100 uf and 1000uf on the power board. I dont seem to be getting the 75 volt link from the power board to the standby board. When I put my meter on AC volts on the 2 wire plug linking the boards I get 0 volts. If I go to the chassis and each terminal I get 70 volts AC, but between the two 0 for some reason.
Obviously I am getting no DC voltage from either board. Help!!!!!!

[selldoor]

Re: Phillips 37PF5521D dead after power cut

Ok - I dont know a lot about tvs but will give you a few tests to get started.
Is the fuse in the mains plug ok and is the wiring ok and have you tested soemthing else in the mains socket you are using.
The pictures are not really good enough for troubleshooting but on the brown board there are 3 fuses (at least) pictures of the other sides?)) Can you check the fuses
POWER OFF Meter on ohms 200 one lead lead on each side of the fuse -post results.
Fuses - 1 ceramic top right - one glass bottom left one red barrel fuse top left barely visible.
Also bottom centre the red wire goes to a socket that looks scorched - is it or is it just dust and the picture.
Cap top right under where it says "marked type" is reflecting a bit oddly - is it bulged or does it look ok.


EDIT - check in your post have you put the correct boards against the
caps you have changed - you may be able to edit it if you are quick.

The green board is just AUDIO standby - yes?

[flocko]

Re: Phillips 37PF5521D dead after power cut

Hi yes fuses all ok , center two wire socket i believe to be the supply to the standby board i think it should have 70v ac on and i can only get 70v each side to the chassis these wire are not burnt what you are seeing is one red wire and the other is red with black tracer. I know the photos are not much good i will pull the board out and take some more later thanks for any help you can give.

[tom66]

Re: Phillips 37PF5521D dead after power cut

Check across it on DC volts; I'm expecting around 320V.

[flocko]

Re: Phillips 37PF5521D dead after power cut

Hi have just checked on Dc 4.9 volts down near the mains in i thought there were two very small glass zener diodes but philips describe them as surge protectors have checked with a meter and they appear to be ok ?

[tom66]

Re: Phillips 37PF5521D dead after power cut

They are surge suppressor (neon tube, like small lightning bolt), they are usually fine unless shattered. Do you hear a clicking sound from that black box (relay) near connector?

[selldoor]

Re: Phillips 37PF5521D dead after power cut

I would have thought everything on that side of the board would be" hot"?
Where did you check perhaps use the board numbers - we can see some of them.

[budm]

Re: Phillips 37PF5521D dead after power cut

"If I go to the chassis and each terminal I get 70 volts AC' It sounds like you are using the chassis gorund as the ground ref point whne measuring voltages in the primay (hot) side. When you working in the primay side, the neagtive leg of the large DC main filter will be your ground ref point. If you use chassis as the ground ref point for the primay side, all the voltage readings will be wrong.
You will use the chassis as the ground ref point when you work on the seconadry side.

[flocko]

Re: Phillips 37PF5521D dead after power cut

the board No 3104 313 60822 standby boars No 3104 313 60643 If you look at my not so good photos the center two wire connector on the brown power board go to the top right of the standby board ,there are lots of these board on ebay , i will take some more voltage reading using the the dc -cap as ref and post later thanks to you all for your help

[flocko]

Re: Phillips 37PF5521D dead after power cut

Voltage taken as suggested between -dc main caps and the two outputs on the power board 2.5v ac on each ?

[selldoor]

Re: Phillips 37PF5521D dead after power cut

the board No 3104 313 60822 standby boars No 3104 313 60643

If that was in reply to my asking for board numbers - I had those I meant the numbers on the board next to the parts.
For example (and also a question) do you know what the component is
at 9320 to the right of the blue resistor at 3304.

Can you answer Toms query re clicking at the relay - black box near the red
wire connector.

[budm]

Re: Phillips 37PF5521D dead after power cut

The DC Negative leg of the main DC filter cap in the PRIMARY will be your ground ref point when you are working in the PRIMARY side of the circuit you are troubleshooting.
You use the chassis as the ground ref point when you are working in the SECONDARY side of the circuit (DC outputs that feeds the boards).

[selldoor]

Re: Phillips 37PF5521D dead after power cut

Can we go back to more basic? Do you get 230vAC on the black and white wires?

Do you get 230VAC across the ceramic fuse

Is the component on the heatsink to the left of the Blue Resistor at 3304 a bridge rectifier - or what?

[budm]

Re: Phillips 37PF5521D dead after power cut

Chaeck and see if the resistor R3318 is open:
http://s807.photobucket.com/albums/y...037PF9631D_37/

[flocko]

Re: Phillips 37PF5521D dead after power cut

no the relay is not clicking, there is no component at 9320 it a wire link, yes i think the component on the heatsink is a bridge rectifier,r3318 100ohm 1/2 watt was ok but i have changed it for 470ohm 1/2 watt . do you think it could be the rectifier would i need to take it off the boar to test it ?

[budm]

Re: Phillips 37PF5521D dead after power cut

Do you hae the Chassis P/N? Philips will use the same model number but will have a bunch of difference chassis numbers also. I want to see if I can get the service manual for it.

[IamCanadian]

Re: Phillips 37PF5521D dead after power cut

if the 100ohm resistor was ok, Why change it out with a different value?

[budm]

Re: Phillips 37PF5521D dead after power cut

The Philips released the bulletine for the resistor fix due to many resistor failures. It is changed from 100 Ohms to be 470 ohms.

[IamCanadian]

Re: Phillips 37PF5521D dead after power cut

Ahh ic kind of a service bulletin thing.

[flocko]

Re: Phillips 37PF5521D dead after power cut

hi if p/n is the prod Noon the back sticker its VNID 0624 002900 other No SLC4.314AB hope these are the ones you need