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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Panasonic TH42PH9 Half screen working

 
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J-man
New User

Aug 7, 2012, 11:50 AM

Post #1 of 34 (9767 views)
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Panasonic TH42PH9 Half screen working Can't Post
Hello all,

I got a Panasonic TH42PH9 with only the right side is working.
The left side has part white part black
http://www.youtube.com/watch?v=loIwKolHGB4
(not my plasma but exeacly the same problem)
I checked the ribbons they seem to be Ok.

i like too try and mend this my self :)


(This post was edited by J-man on Aug 7, 2012, 1:42 PM)



J-man
New User

Aug 9, 2012, 11:39 AM

Post #2 of 34 (9732 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
anyone??


74f100
Enthusiast

Aug 10, 2012, 11:36 AM

Post #3 of 34 (9720 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
A half screen would typically be caused by panel control (usually a D board in Panasonic). Logic buffer, or panel. And any interconnecting cables.

I've never seen that model, I'm assuming its not a US version. But the troubleshooting would be the same.

Jim
HDMI not working



J-man
New User

Aug 11, 2012, 12:13 PM

Post #4 of 34 (9705 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
True it's a EU model i think ... and it's not an TV as it hasn't have a tuner .. it's more a monitor.
I believe it has the same internals as a TH-42PV60E


if panel is broken, on the white part when i disconnect a ribbon cable the white goes black .. is that maybe a sign that panel isn't broken??


74f100
Enthusiast

Aug 11, 2012, 5:05 PM

Post #5 of 34 (9699 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Not necessarily. You are just removing all input waveforms from the logic buffer.

Look just below the logic buffer for a piece of metal running over the ribbon cables that connect to the lower side of the buffer. These connect the panel to the logic buffer.

If you remove that metal covering, you will be able to see the little IC's on the ribbon cables. You will look for one that is physically burnt. If that is the case, the panel is shot.
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J-man
New User

Aug 11, 2012, 6:10 PM

Post #6 of 34 (9696 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
they are all looking good ..




74f100
Enthusiast

Aug 11, 2012, 7:20 PM

Post #7 of 34 (9693 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Yes, that is good news. When those fail the panel has to be replaced.

Now work backwards towards the D board. The problem would then almost have to be something with the D board, buffer or cables between.
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J-man
New User

Aug 11, 2012, 10:27 PM

Post #8 of 34 (9689 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
The cables are looking good .. is there a way to check the D board or buffer?


74f100
Enthusiast

Aug 12, 2012, 5:18 PM

Post #9 of 34 (9679 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Not that I know of. The manuals on those will tell you to replace those boards to test.

You could try ohm checking the small brown surface mount capacitors. If you find a group that is shorted to ground, that would be an indication that the IC they are connected to is bad.
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J-man
New User

Aug 12, 2012, 5:58 PM

Post #10 of 34 (9678 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Yeah iknow what you mean .. did that with an other plasma i got .. 1 of the IC's shorten tryed to solder a new IC .. but no luck the IC's feet are to small hehe.

Ill first order a D board .. let you know if it worked.
if not ill get a buffer.
Is it best to replace both buffers C1 and C2 .. or is it ok to replace only the buffer where there is no picture?


74f100
Enthusiast

Aug 13, 2012, 3:08 AM

Post #11 of 34 (9668 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Just replacing the one should be fine. I've never seen any requirement for replacing logic buffers as a pair.
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J-man
New User

Aug 16, 2012, 4:14 PM

Post #12 of 34 (9653 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
I ordered a D board first ..
ill let you know if that worked.


J-man
New User

Aug 21, 2012, 2:29 PM

Post #13 of 34 (9627 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
replaced the D board ... didn't solved the problem


74f100
Enthusiast

Aug 22, 2012, 2:58 AM

Post #14 of 34 (9619 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
One other thing I thought of, did you switch the ribbon cables that lead from the D to each of the C boards?

Look and see if they are the same size and number of pins, and if the same switch them around.
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J-man
New User

Aug 22, 2012, 8:29 AM

Post #15 of 34 (9615 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
for new ones? i only disconected them to replace the D board


74f100
Enthusiast

Aug 22, 2012, 11:03 AM

Post #16 of 34 (9612 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
No. Does the D board have two ribbon cables going to the C boards? If it does, one should be going to C1 and the other going to C2.

I can't look up anything on your set, so I'm guessing at things I've seen on Panasonic plasmas I've worked on in the past.Wink
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J-man
New User

Aug 22, 2012, 11:10 AM

Post #17 of 34 (9611 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
it does .. i switched does cables but still no picture on the same side.
also the screen makes a high pitch sound where the screen is white is that normal?


J-man
New User

Aug 22, 2012, 11:47 AM

Post #18 of 34 (9609 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
i forgot to mansion .. that befor this happend i sometimes hade a black or coloured bar in the screen (on the side what failed) and when i (small)hit the sides of the screen it want a way


74f100
Enthusiast

Aug 22, 2012, 10:37 PM

Post #19 of 34 (9598 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Ok, then I would say you've either got a bad C or panel.
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J-man
New User

Aug 23, 2012, 9:05 AM

Post #20 of 34 (9595 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Ok, when i disconect the ribbon cables from the panel to the C on the bad side .. the panel goes black with colored lines
maybe a sign the panel isn't broken??


74f100
Enthusiast

Aug 23, 2012, 11:18 AM

Post #21 of 34 (9592 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
No, I don't think that really tells us much. The waveforms from the SD and SU are still present, so you'll see random things. But I don't know for sure, I've never disconnected them on a known good TV.
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J-man
New User

Aug 23, 2012, 3:45 PM

Post #22 of 34 (9588 views)
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Re: [74f100] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Well i ordered the C buffer .. hope that will fix the problem.


J-man
New User

Aug 24, 2012, 8:56 AM

Post #23 of 34 (9585 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
Just a picture of my screen



chrgshah
New User

Aug 25, 2012, 12:47 PM

Post #24 of 34 (9571 views)
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Re: [J-man] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
I Have This Model SErvice Manual With Schematic..

If you Need !
E-Mail me chiragashah1984@yahoo.com


J-man
New User

Aug 25, 2012, 2:28 PM

Post #25 of 34 (9568 views)
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Re: [chrgshah] Panasonic TH42PH9 Half screen working [In reply to] Can't Post
I got it thanks tho.

Well replaced the C buffer .. still same problem :(
Chould it be a problem with the SC board?

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