Unstable Picture During White Screen

roddyama · 21st January 2004, 06:31 AM

Hi guys,

Why does the picture from my DVD become unstable when it tries to show a white screen? I can see a black nearly horizontal bar flickering at the top of the screen.

Duo · 21st January 2004, 06:57 AM

Is it only on the DVD player itself? Or have you found this to occur on other tvs as well??

It seems like perhaps the signal is too strong for the tv or something along those lines.

I'm not very well educated in this area; however, I find that crazy high signal strength causes weird things of that sort to happen.

Anyway, I think somebody more knowledgeable in the area of video signalling will have a good idea of what's going on...

golftdibrad · 21st January 2004, 07:15 AM

try playing with the freq/scan rate of the display device. I had this prob with my qa 1050, but it turns out all i had to do was adjust the hor freq.

Duo · 21st January 2004, 09:33 AM

Sounds like an idea

Frank Berry · 21st January 2004, 10:01 AM

Did you terminate the DVD video cable with a 75 ohm resistor?

roddyama · 21st January 2004, 11:46 AM

Thanks for the replies.

It only happens with the Toshiba DVD (Best Buy) and my old Sony TV, but this is all I have. I use just the run of the mill 75ohm cables.

As you can see, I'm more of an audio fanatic than a video fanatic. It's just an inconvenience when Neo goes through the door with the light behind it, or a there's a nucular explosion and the screen goes haywire. It make it hard to suspend disbelief.

Frank Berry · 21st January 2004, 11:50 AM

I have exactly the same problem with my JVC DVD player and my old, old Sony TV. Another TV, a JVC (and much newer) doesn't have a problem with the video. I suspect the coupling capacitors in the vertical sync circuits are going bad.
Since my Sony is about 20 years old, repair is out of the question.
I'll replace the old, reliable Sony.

roddyama · 21st January 2004, 11:59 AM

Quote:

Originally posted by Frank Berry

Since my Sony is about 20 years old, repair is out of the question.
I'll replace the old, reliable Sony.

My situation exactly. I guess I need to bite the bullit and start looking at new ones.

It's just the heatsinks and transformers and caps I could buy with that money,... and speakers, don't get me started on speakers.

Frank Berry · 21st January 2004, 12:07 PM

Time for another trip to Best Buy. That's where I got my JVC DVD player.
I just returned from a trip to Michigan. The Cadillac area. While there, I purchased a DVD player for my cousin (as a way of saying thanks for letting me stay in her home while I was visiting).
The DVD player cost all of $43. from Best Buy!

21st January 2004, 06:31 AM	#1
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	Unstable Picture During White Screen Hi guys, Why does the picture from my DVD become unstable when it tries to show a white screen? I can see a black nearly horizontal bar flickering at the top of the screen. __________________ Rodd Yamashita

21st January 2004, 06:57 AM	#2
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Is it only on the DVD player itself? Or have you found this to occur on other tvs as well?? It seems like perhaps the signal is too strong for the tv or something along those lines. I'm not very well educated in this area; however, I find that crazy high signal strength causes weird things of that sort to happen. Anyway, I think somebody more knowledgeable in the area of video signalling will have a good idea of what's going on... __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

21st January 2004, 09:33 AM	#4
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Sounds like an idea __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

21st January 2004, 10:01 AM	#5
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	Did you terminate the DVD video cable with a 75 ohm resistor? __________________ Frank

21st January 2004, 11:46 AM	#6
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	Thanks for the replies. It only happens with the Toshiba DVD (Best Buy) and my old Sony TV, but this is all I have. I use just the run of the mill 75ohm cables. As you can see, I'm more of an audio fanatic than a video fanatic. It's just an inconvenience when Neo goes through the door with the light behind it, or a there's a nucular explosion and the screen goes haywire. It make it hard to suspend disbelief. __________________ Rodd Yamashita


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21st January 2004, 07:15 AM	#3
golftdibrad diyAudio Member Join Date: Oct 2003 Location: New Orleans area	try playing with the freq/scan rate of the display device. I had this prob with my qa 1050, but it turns out all i had to do was adjust the hor freq.

21st January 2004, 11:50 AM	#7
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	I have exactly the same problem with my JVC DVD player and my old, old Sony TV. Another TV, a JVC (and much newer) doesn't have a problem with the video. I suspect the coupling capacitors in the vertical sync circuits are going bad. Since my Sony is about 20 years old, repair is out of the question. I'll replace the old, reliable Sony. __________________ Frank

21st January 2004, 12:07 PM	#9
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	Time for another trip to Best Buy. That's where I got my JVC DVD player. I just returned from a trip to Michigan. The Cadillac area. While there, I purchased a DVD player for my cousin (as a way of saying thanks for letting me stay in her home while I was visiting). The DVD player cost all of $43. from Best Buy! __________________ Frank

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