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Equipment Repairs => PLASMA TV forum => Topic started by: mainstreem on May 28, 2009,04:54:45

Title: Flashing pixals on MATSUI 42P900
Post by: mainstreem on May 28, 2009,04:54:45

Hi there, I am having problems with my MATSUI 42P900 plasma screen.

I have been getting these flashing pixels all over the screen now for the last few months.
it's most noticeable in the dark/black areas of the picture....looks like snow. ( like on old tv's when not tuned in right)

I have tweaked with the V up and V down pots on the back and got a great picture. however, coming back to turn it on again this morning and its back to the way it was.

I have located a repair kit for around £90 for all 3 boards on-line. but can anyone help me with any tips or can anyone suggest something that i may not have thought of yet before I go out and spend $$$

is this due to over heating?
could it be something else than the Ysus board?
I have sound and like I said, when I adjusted it with V settings, it seem to get a lot better but keeps returning to the state it was in before.

Anyone else had this problem?

any help would be really appreciated

Thanks guys.

cheers

Title: Re: Flashing pixals on MATSUI 42P900
Post by: norman on May 28, 2009,06:24:57

Hi, I have had this problem a few times. Replace C36, C72 and C203. They are all 33uf surface mount caps near a small transformer towards the left hand side of the y sus board approx a third of the way down. When you have changed them let the set run for 15min then adjust your v up/dn controls and see how it goes. It is normal to get sparklies for a few minutes from cold as the pdp panel gets older, you may have to get a best compromise with the v up/dn controls. If you still have problems then panel replacement is the next step. Try SEME for the boards, I think they are quite a bit cheaper. Hope this helps, Norman

Title: Re: Flashing pixals on MATSUI 42P900
Post by: mainstreem on May 28, 2009,06:54:41

That's great, nice one....

so thats whats caursing the snowy/pixalation effect?

oh, i also noticed that its buzzing quite loud as well and earlier it just shut off for a while and i couln't turn it back on. the standby light was on but nothing else.....after a while I tried it again and it came on???

is all this to do with those caps then?


any idea where I can obtain these from?

C36, C72 and C203

cheers

Title: Re: Flashing pixals on MATSUI 42P900
Post by: norman on May 28, 2009,10:03:46

Hi, I think when those caps are bad the little transformer is noisy. To be honest when I change the caps I use 47uf standard caps and bend the legs to fit the pads. Cheers norman.

Title: Re: Flashing pixals on MATSUI 42P900
Post by: mainstreem on May 28, 2009,11:15:27

righto mate,

had another look at the caps you mentioned and they look fine, none swollen, broken or burnt.
I don't have equipment to test the boards.

I think What I need to do is change over the boards.

well thanks for all your help pal, really do appreciate you helping me out

I'll let you know how I get on when I order the boards.



Thanks anyway mate,