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Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 7180
Experience:  USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
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My Magnavox TV will not turn on. The green lamp flickers and

Resolved Question:

My Magnavox TV will not turn on. The green lamp flickers and the screen has random vertical lines and within a few seconds everything shuts off. I have replaced the power board, the horiz and vert scan board and logic board. Still will not turn on. The power up sequence is the same with new or old boards. If I pull the logic ribbon cable going to the screen I get a colorful screen but with random colors and lines.

Do I have a bad LCD screen, or it's drivers wherever they might be. The TV is inherited so I have no background history.
Submitted: 5 years ago.
Category: TV
Expert:  Dan replied 5 years ago.
Thanks for the question. My name is Dan.

Tell me more about the lines you see. Are they thin? Like a colored bar code?

Respectfully,
Dan
Customer: replied 5 years ago.
Yes they are. Remember they appear only when I pull the flat ribbon cable from the digital board to the LCD screen PCB that runs the length of the bottom of the screen.
Customer: replied 5 years ago.

Yes they are. Remember they appear only when I pull the flat ribbon cable from the digital board to the LCD screen PCB that runs the length of the bottom of the screen. The TV will turn on and stay on with this cable removed.

 

Expert:  Dan replied 5 years ago.
But you already replaced the digital board?
Customer: replied 5 years ago.
I replaced all three boards. There are only three boards on the TV back panel. With either the old or new digital board, removing the ribbon cable caused the tv to not immediately shut off and displayed the vertical thin color bars. I can only find two other PCB's, the operators vertical row of pushbuttons on a skinny PCB and the long on on the bottom of the LCD screen that has several components.
Expert:  Dan replied 5 years ago.
Can you take a picture of the back of the TV with rear cover removed so I can see the boards?

There are a couple ways to get a picture here for me to see...

1. You can upload the picture directly, by clicking on the paper clip icon which should be on the toolbar (just above the text box where you're typing). The picture has to be less than 5MB.
2. You can upload the picture to a sharing site like www.wikisend.com. Just be sure to give me the download link.
3. You can email the picture [email protected] and they will forward it to me. This option might take a few hours or even a day, so only do this if you have to.

Dan






Customer: replied 5 years ago.
I will send the picture tomorrow and down size it.
Expert:  Dan replied 5 years ago.
Take care not to make it too small. There is no size limit on wikisend.com or [email protected] email.


Dan
Customer: replied 5 years ago.
Here she is.graphicI hope it worked ok.
Expert:  Dan replied 5 years ago.
Didn't come through. Can you upload it to www.wikisend.com and give me a link?
Customer: replied 5 years ago.
I will give it a try.
Customer: replied 5 years ago.

DSC00429.JPG

 

544962

Customer: replied 5 years ago.

I will sign off for this evening, need to get up tomorrow before the cock crows.

 

I hope the photo comes thru and provides some insight to the problem.

Expert:  Dan replied 5 years ago.
Didn't come through. Ok let's just email the picture [email protected] from your registered email address, and they will forward it to me.


Dan
Customer: replied 5 years ago.
Are we back in service?
Expert:  Dan replied 5 years ago.
Yes, the site is back up. Were you able to get a picture?
Customer: replied 5 years ago.
I sent it to your just answer site.
Expert:  Dan replied 5 years ago.
I haven't received it. It may be best to resend it, since the servers were down pretty much all day yesterday.
Customer: replied 5 years ago.
Just sent the photo again. Third time.
Expert:  Dan replied 5 years ago.
Ok.
Expert:  Dan replied 5 years ago.
Ok, got the picture. Not sure what took so long... sorry about that.

I looked at your boards and also the service manual and history for this set, and yes you definitely have a bad LCD panel here.

The panel is replaceable, but I really doubt you'll find one cheap enough to make it cost effective. It would be wiser to replace the TV, in my opinion and experience.



Dan
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