Philips PHP x19

[sabre504]

HI all have a philips php x19 wide screen that i am working on.
Came to me with a lovely pink screen so changed the ccfls thats all ok now ,
but still had a shut down problem the usual 2 sec to black power led solid blue .
Changed all the caps for Rubycon yxg and noticed scorching to the board just behind the transformers (pic 1 ).

Still has 2 sec to black and suspect that these may be at fault (pic 2 )
but i cant find a spec sheet for these as the only markigs are 3055 at the top and 6G bottom right hand corner but no manufacturer name .
Has anyone dealt with these before or have any idea what i can use to replace them .
Also there is no buzzing or hissing noises coming from the transformers but will check them when new meter comes (broke my analogue one by treading on it ) only have my digital that does not have x1 resistance scale.
Any suggestions welcome

[sabre504]

Re: Philips PHP x19

Sorry forgot to mark picture 2

[jetadm123]

Re: Philips PHP x19

It's a N-channel mosfet made by several manufacturers. For info purposes only, go to digikey.com and type in "3055 mosfet" in the search window. You'll get several manufacturers. Match one of those manufacturer's part number to what's avaliable to you in the UK.

[Rtech]

Re: Philips PHP x19

Try PHD3055E

[sabre504]

Re: Philips PHP x19

Thanks guys not having much luck tho
Will have to search for some other alternatives

[jetadm123]

Re: Philips PHP x19

You can go on ebay and search for 3055 mosfet. Some of the sellers will ship to the UK. A possible substitute is IRLR014N, 55V, 10A, 140 mOhm

[seanc]

Re: Philips PHP x19

Where did you source your CCFLs from?
I was trying fix one where the wire had become disconnected, instead I managed to crack the end of the tube just where the wire connects - to a little pin that's inside the CCFL and it has come out.
I can put it back in, but I don't think it'll work.

[jetadm123]

Re: Philips PHP x19

Where did you source your CCFLs from?
I was trying fix one where the wire had become disconnected, instead I managed to crack the end of the tube just where the wire connects - to a little pin that's inside the CCFL and it has come out.
I can put it back in, but I don't think it'll work.

In the States, some members recommend ccflwarehouse.com. Don't know if they ship to the UK.

[retiredcaps]

Re: Philips PHP x19

In the States, some members recommend ccflwarehouse.com. Don't know if they ship to the UK.

Their ebay account might ship worldwide?

http://stores.ebay.com/plazmo-industries

[seanc]

Re: Philips PHP x19

Indeed their website says international shipping is $12.95 which is ~£8.00.

I'll take measurements tomorrow.

[sabre504]

Re: Philips PHP x19

I had some spare ones on another unit that had a cracked screen
what ones are you after ( what model monitor )

[seanc]

Re: Philips PHP x19

2009 20" LG widescreen monitor. I've forgotten the model, will check tomorrow.

[sabre504]

Re: Philips PHP x19

Oh sorry mate only got 19" wide screen but your welcome to try them
i tend to keep back panels from cracked screens for future use as some units are a mare to take the bulbs from its easier to swap the lcd overlay as long as its a match
Also there is this company Uk based
backlightweb.co.uk

[triumph]

Re: Philips PHP x19

Hi Sabre504. Personally, I would have put Panasonic caps in as they are top quality. Also if they were, for example, rated at 25v, put in 35v caps. Always go for 105 degree caps too. A higher voltage cap wont cause any damage, a higher capacitance will. Also using overrated components will help long term reliability. But your panel looks like it was getting well hot!!! This can be partially relieved with a computer fan blowing cool air up the back of the monitor or drawing hot air out. ANY air movement is helpful . Hope this helps.

[sabre504]

Re: Philips PHP x19

The caps i used are what i have but am replacing slowly with pannys when i need stock .

The mosfets arrived and have fitted them and is working ok now just waiting for some new lamps and all done , thanks all for your input

[smason]

Re: Philips PHP x19

Have you measured the resistance of the inverter transformers?
I'd measure each one, and compare. Of my last 4 "2 seconds to black" monitors, 1 was caps, 1 was a bad ccfl, and 2 were bad transformers.

[sabre504]

Re: Philips PHP x19

I am replacing the lamps with newer ones because i have found some new complete sets ready made quite cheap.
But have had another of these come in red screen (lamps) and a buzzing transformer.
I bought extra mosfets on the last one so i will test transformers and change all caps,lamps and mosfets and if it still buzzes i will get some new transformers

[sabre504]

Re: Philips PHP x19

Well looks like the new lamps have finished the first one nicely ,
brightness down on 22 and contrast down to 40 .

Thanks for all the input and advice