Magnavox 52" LCD Dead Display, TCON? Mainboard?


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Magnavox 52" LCD Dead Display, TCON? Mainboard?

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tvbegone
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Aug 25, 2015, 2:42 AM

Post #1 of 24 (2585 views)
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Magnavox 52" LCD Dead Display, TCON? Mainboard?	Can't Post

I have a 52" Magnavox LCD that died to black screen in a dazzling display of colors and lines. I tried replacing the TCON board and that got me a something on the display with some partially visible sections of screen and green lines and boxes. So my question is: if it isn't (just) the TCON board then what is the next likely issue? Mainboard? Panel itself? Loose ribbon cables? Or possibly the TCON replacement is also bad? Thanks.

(This post was edited by tvbegone on Aug 25, 2015, 2:43 AM)

jts1957
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Aug 25, 2015, 3:22 AM

Post #2 of 24 (2580 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Can't See A Thing ... SO MANY SPECIFICS ... Information Overload!

52" = About 7,540,000,000 results (0.38 seconds) ... LCD = About 354,000,000 results (0.49 seconds)
Magnavox = About 1,230,000 results (0.33 seconds) ... Dead Display = About 212,000,000 results (0.50 seconds)
TCON = About 1,220,000 results (0.31 seconds) ... Panel = About 1,030,000,000 results (0.37 seconds)
Mainboard = About 12,900,000 results (0.36 seconds ... Main Board = About 490,000,000 results (0.36 seconds)
loose ribbon cables = About 387,000 results (0.52 seconds)
tvbegone = About 6,070 results (0.31 seconds) ... tv b gone = About 156,000,000 results (0.31 seconds)

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Location: Far, Far Away

(This post was edited by jts1957 on Aug 25, 2015, 3:23 AM)

tvbegone
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Aug 25, 2015, 3:49 AM

Post #3 of 24 (2575 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Are you a bot? TV model number is 52MF437S/37B I think same as 52PFL7422D/37

Looking for any tips on how to isolate the problem. Thanks.

(This post was edited by tvbegone on Aug 25, 2015, 4:33 AM)

jts1957
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Aug 25, 2015, 4:52 AM

Post #4 of 24 (2568 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Non sequitur ... Insufficient data ... illogical

IMPORTANT: Horizontal lines on the screen are virtually NEVER caused by a bad T-con board. Horizontal lines indicate a defective LCD panel (screen).

Error Code(s)?, Blinking LED code(s)?, Photograph(s) of problem?

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Location: Far, Far Away

(This post was edited by jts1957 on Aug 25, 2015, 5:03 AM)

tvbegone
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Aug 25, 2015, 4:17 PM

Post #5 of 24 (2549 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Here is latest image:

http://i.imgur.com/JBPlJwL.jpg

When it failed originally it was half of the screen first and I seem to remember vertical colored lines then the other half then all black. This image is with a replacment T-con board.

jts1957
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Aug 25, 2015, 6:16 PM

Post #6 of 24 (2533 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

OSD/Menus affected?

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tvbegone
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Aug 25, 2015, 7:30 PM

Post #7 of 24 (2521 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Yes OSD & menus are affected. Does the fact that a different T-Con board gave me that image rather than a black screen tell us anything? The panel is damaged and caused the original T-con board to fail?

(This post was edited by tvbegone on Aug 25, 2015, 7:38 PM)

jts1957
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Aug 25, 2015, 8:19 PM

Post #8 of 24 (2505 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Or original new-to-you 'replacement' also bad.

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tvbegone
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Aug 25, 2015, 9:18 PM

Post #9 of 24 (2494 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Yes that is definitely possible. Any way to determine that without trying another one? Is the image shown consistent with a bad T-con board?

jts1957
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Aug 25, 2015, 10:18 PM

Post #10 of 24 (2490 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

http://www.tv-forums.com/...i?post=160222#160222

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Location: Far, Far Away

(This post was edited by jts1957 on Aug 25, 2015, 10:19 PM)

tvbegone
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Aug 26, 2015, 2:54 AM

Post #11 of 24 (2484 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

I see so given that there are horizontal lines and vertical lines and partially visible sections and solid block sections I am not sure what to think. Is it possible that it is just the T-con board if there are those horizontal lines/bands? Is it possible for the panel to fail so catastrophically all at once?

jts1957
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Aug 26, 2015, 4:01 AM

Post #12 of 24 (2482 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Again: IMPORTANT: Horizontal lines on the screen are virtually NEVER caused by a bad T-con board. Horizontal lines indicate a defective LCD panel (screen).

Quote

Is it possible for the panel to fail so catastrophically all at once?

You should peruse threads other than your own. While some may differ on certain points, tcons & LCD panels (in all brands) all do the same jobs.

YES http://www.tv-forums.com/...i?post=160222#160222

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Location: Far, Far Away

tvbegone
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Aug 26, 2015, 4:46 PM

Post #13 of 24 (2469 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

There were never ONLY horizontal lines on the display. The failure from what I recall most resembled the image below before the screen went black (only a few seconds from start to finish). I will definitely keep reading, but can you tell me is it possible for only a bad T-Con board to produce the image shown in the photo I posted above? Because with the replacement T-con it has both horizontal and vertical blank lines and the whole screen is messed up. So could all of that be caused solely by the T-Con or is it likely to involve a panel failure? Thanks for your time.

http://i.imgur.com/15WhY.jpg

(This post was edited by tvbegone on Aug 26, 2015, 4:49 PM)

jts1957
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Aug 26, 2015, 7:54 PM

Post #14 of 24 (2459 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Which was image/link/photo then versus image/link/photo now?, When did Brand change?

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tvbegone
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Aug 27, 2015, 12:35 AM

Post #15 of 24 (2446 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Current photo w/ replacement (possibly bad) T-Con: http://i.imgur.com/JBPlJwL.jpg

Something representative of what it looked like when it failed which was from good picture to no picture in a few seconds, rainbow lines covered whole screen momentarily, not my photo: http://i.imgur.com/15WhY.jpg

(This post was edited by tvbegone on Aug 27, 2015, 12:37 AM)

jts1957
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Aug 27, 2015, 1:04 AM

Post #16 of 24 (2442 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Can the original tcon board be reinstalled and a photo/video taken?

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Location: Far, Far Away

tvbegone
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Aug 27, 2015, 2:22 AM

Post #17 of 24 (2440 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

With original T-con screen is 100% black no picture.

So either:
1. Original T-con bad, Replacement T-con bad, Panel ok
2. Original T-con bad, Replacement T-con good, Panel bad
3. All 3 bad
4. One of the above plus mainboard bad

Any favorites?

(This post was edited by tvbegone on Aug 27, 2015, 2:34 AM)

jts1957
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Aug 27, 2015, 2:35 AM

Post #18 of 24 (2436 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Part number of tcon? Both match in all regards (prefix/suffix/version, etc.)?

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tvbegone
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Aug 27, 2015, 3:22 AM

Post #19 of 24 (2434 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

CPWBX3749TPZB

Yes they completely match AFAIK.

tvbegone
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Aug 27, 2015, 5:41 PM

Post #20 of 24 (2422 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

So I'm thinking of trying another T-con. Any advice whether:

1. Yes, it's possible for just a bad T-con to produce that blocky green image. The panel could be fine. Also unicorns could be real.

2. No, the only way for that blocky green image to exist is if there is a problem with the panel.

jts1957
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Aug 27, 2015, 6:48 PM

Post #21 of 24 (2419 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

F1 on both tcons reads zero ohms? (I thought I had already posted this, but maybe the unicorns needed lunch)

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tvbegone
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Aug 27, 2015, 7:03 PM

Post #22 of 24 (2417 views)
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Re: [jts1957] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Yes fuses are ok.

tvbegone
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Sep 4, 2015, 9:49 PM

Post #23 of 24 (2365 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Well I was able to confirm the replacement T-Con is working by sending it to someone who tested it in a working TV. So now is the remaining problem most likely in the mainboard or the panel? If we know that working T-con produces this image: http://i.imgur.com/JBPlJwL.jpg

(This post was edited by tvbegone on Sep 4, 2015, 9:52 PM)

tvbegone
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Sep 9, 2015, 5:57 PM

Post #24 of 24 (2333 views)
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Re: [tvbegone] Magnavox 52" LCD Dead Display, TCON? Mainboard? [In reply to]	Can't Post

Well I guess my options at this point are to try a new mainboard or harvest parts and recycle it. Any advice?

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