phillips 42pf9766/99 plasma

[himinshed]

hello all i have a problem with a phillips 42pf9766/99 plasma with a chassis model ftp2.2a aa About a month ago we heard the odd crack from behind the set then the other day the sound went off shortly followed by the picture.Now when i try to switch on the power switch i get a blue light for a couple of seconds then a flash on the red led and set shuts down .When turned on the 3 green caps on the board all light up for a few seconds but the top 2 go out after the red flashes leaving the lower one on .. My first thought was bad caps in the power supply but after a visual check i dont know all look in new condition no bulging or leakage hoping someone can steer me in the right direction cheers shayn

[tom66]

Re: phillips 42pf9766/99 plasma

It would be very helpful if you could post some pictures of the boards inside your set so we can see what there is inside, who made the plasma panel and how it is all connected.

[himinshed]

Re: phillips 42pf9766/99 plasma





Here are the photos of the phillips 42pf9766/99 plasma panels looks like samsung. Hope you can help. cheers, Shayn

[tom66]

Re: phillips 42pf9766/99 plasma

Where are the "three green caps" you say light up? Can you highlight them on the image?

[himinshed]

Re: phillips 42pf9766/99 plasma

hello all i said in my original post that 3 green caps lit up i ment to say 3 green leds lit up you can see them on the left of the ac input and fuse, the transfomer on the left of the board looks as it may have been hot at some time
but as yet i have not located a circuit schematics so i cant measure it.cheers Shayn

[tom66]

Re: phillips 42pf9766/99 plasma

Do the indicators have labels near them?
Can you see a part code starting with BN44, BN9x or LJ9x on the board? I may be able to locate schematics.

[himinshed]

Re: phillips 42pf9766/99 plasma

hello all..the leds are numbered from the top 801 ,802,803 the only code starting with ljx
on the board is ass y code:lj44- 0058a cheers Shayn

[tom66]

Re: phillips 42pf9766/99 plasma

Is there an extra digit in the LJ44 number they usually have five digits plus letter.

[himinshed]

Re: phillips 42pf9766/99 plasma

hello tom SORRY i you are right i missed out a 0 the number is LJ44-00058A cheers ..Shayn

[tom66]

Re: phillips 42pf9766/99 plasma

Can you post a picture of the model # sticker (on rear of TV case) so I can find the chassis number. Ohm Supplies sell the power supply for £40 plus VAT. http://www.ohmsupplies.co.uk/POWER-SUPPLY-LJ44-00058A

[himinshed]

Re: phillips 42pf9766/99 plasma

hello tom i think the info you need is in my second post top pic but have taken the other id tag in this post cheers shayn

[himinshed]

Re: phillips 42pf9766/99 plasma

Hello Tom after some web research i think the phillips tv model s42ax-xbo1
FTP2.2a aa has the chassis manual 3122 788 14860 which i am unable to locate any help to locate this chassis manual would be very much appreciated
cheers himinshed

[tom66]

Re: phillips 42pf9766/99 plasma

This is a close match

[himinshed]

Re: phillips 42pf9766/99 plasma

update on phillips 42pf9766/99 plasma checked voltage on psu board
my voltage silk screen
vs 7.1 175v dc
va 71.5 70v dc
ve 2.6 160 dc
vset -0 173v dc
vscan 0 60 vdc
d5vl 5.2 5.2 vdc
d3v3 3.5 3.3vdc
vcc 15 .07 15dvc
5v2 5.2 5.4vdc
pfc 372 370 to 400 vdc
vccs 102 18vvdc
with that voltage difference do you think that it could be a transformer fault ke0447a seemed to have been hot at one stage and has a slight browing but without a shematic for the board i am a bit in the dark any suggestions woul be great cheers himinshed

[himinshed]

Re: phillips 42pf9766/99 plasma

hello tom thanks for the link i have downloaded the magnavox manual will study it in the morning as there is no voltage on vset or vscan and only 7.1 on vs why the huge over volts on vccs.. 102 instead of 18 is making me rethink my v3t 8005 transformer idea ..cheers himinshed

[himinshed]

Re: phillips 42pf9766/99 plasma

hello all considering that the voltage on my psu is up the put eg: 71.1 volts on VS instead of175v & 0volts on vset &v scan with 102volts on the vccs instead of 18v do you think a new psu would correct my no start problem cheers himinshed

[tom66]

Re: phillips 42pf9766/99 plasma

I would first try isolating the Y-main and X-main to see if the voltages return to normal.

[himinshed]

Re: phillips 42pf9766/99 plasma

hello tom by the way thanks very much for all your paitence and help .. yes i disconected x-main & y-main no change in the voltage on
vset 0 volts vscan 0 volts vccs should be 18vdc but is still102volts dc .. could it still be a transformer on the psu looking forward to your comment cheers shayn

[himinshed]

Re: 42pf9766/79 plasma

hello tom by the way thanks very much for all your paitence and help just a update on my model its a phillips 42pf9766/79 plasma not a /99 as i first posted.. yes i disconected x-main & y-main no change in the voltage on
vset 0 volts vscan 0 volts vccs should be 18vdc but is still102volts dc .. could it still be a transformer on the psu looking forward to your comment cheers shayn