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Equipment Repairs => PLASMA TV forum => Topic started by: paulb1970 on February 17, 2012,14:05:04

Title: samsung ps42b450b1wxxu picture fault ?
Post by: paulb1970 on February 17, 2012,14:05:04

Evening All  :thumbup:

I have a samsung ps42b450b1wxxu which im trying to fix for my brother ...

When i switch it on i get sound and picture - But picture start's off very slow to come up ( bit's at a time )
spreading over the screen ...

After picture has filled whole screen it is totally unwatchable - though you can see the program a little bit as if it's a very poor signal ...

But aerial is ok ...

Has anyone had this problem - and what was at fault ?

Is it a case of a Board on it's way out ? - and any idea which Board ?

Tried searching on here but did'nt come up with anything ...

Any advice much appreciated ...

Cheer's
Paul

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: paulb1970 on February 18, 2012,11:30:13

Hi Shaun,

Thank's for the advice ,

There is a Led constantly flashing on the Logic Board ( Led 2 ) - is this normal ?

All cap's look ok and cant see anything wrong with the joint's ...

Cheer's
Paul

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: paulb1970 on February 22, 2012,10:32:46

*****UPDATE*****

Well i changed Logic Board and made no difference and Led 2 on logic board still flashing so i take it that's normal ?

What else could be the problem ?

When i switch on the picture starts off a little bit at a time and gradually spreads out across the screen when it has filled the whole screen it is totally unwatchable ...

But there is picture and sound even if it is unwatchable ...

Is screen Knacked or another board ???

Any advice much appreciated

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: cdel on February 23, 2012,14:15:19

hi paul,
did you check z-sus board?

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: paulb1970 on February 23, 2012,20:40:42

Quote from: cdel on February 23, 2012,14:15:19

hi paul,
did you check z-sus board?

Hello m8 ,

Z-sus ?

If you mean Y-sus ?
I Had a visual look at it but can't see anything wrong with it ...
Y-Main cap's look ok and can't see any dry joint's ...
Y-Buffer look's ok ...
X-Main cap's look ok and can't see any dry joints ...
X-Buffer look's ok ...

If you mean have i tested it - wouldnt know where to start unless it's something simple i'd need to check ?

Do you think it could be Y-Main at fault ... Did you see picture's i posted ?


Cheer's
Paul

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: tv tony on February 24, 2012,02:42:40

This is a plasma receiver and does not use a t-con board.
Tony Walker

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: cdel on February 24, 2012,04:37:42

hi paul,

on your left side is y-sus other board on the right side is z-sus board try to see if there is leak or shorted component check the fuse first.

also try to all input like scart hdmi av.on may case dark picture on dtv, scart, rf good on hdmi but no sound i was change the eprom no luck instead i replaced main board and tv back to life.

Title: Re: samsung ps42b450b1wxxu picture fault ?
Post by: paulb1970 on February 24, 2012,09:11:18

Quote from: tv tony on February 24, 2012,02:42:40

This is a plasma receiver and does not use a t-con board.
Tony Walker

Cheer's Tony , I knew that much - but changed Logic Board = made no difference  :wink1:

Quote from: cdel on February 24, 2012,04:37:42

hi paul,

on your left side is y-sus other board on the right side is z-sus board try to see if there is leak or shorted component check the fuse first.

also try to all input like scart hdmi av.on may case dark picture on dtv, scart, rf good on hdmi but no sound i was change the eprom no luck instead i replaced main board and tv back to life.

Cheers cdel ,

I will have a another look when i get home ,

( my board's are labeled Y-Main and X-Main ) But i understand what your saying  :wink1:

Thank's again Guy's