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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
bright white screen

 
 


sdonaldson
New User

Feb 27, 2010, 10:26 PM

Post #1 of 9 (1170 views)
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bright white screen Can't Post
I had a 2004 Magnavox 51MP392H/17 give to me.The screen is bright with the brightness in menu all the way down.Looked in side the CRTs the red is clear meaning i can see what should be on the screen. the green and blue look like frost on window on the inside. would changing the coolent solve this. THANKSWink



jts1957
Veteran


Feb 28, 2010, 12:03 AM

Post #2 of 9 (1165 views)
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Re: [sdonaldson] bright white screen [In reply to] Can't Post
Red + Blue + Green = WHITE
If green/blue are contaminated you would think brightness of them would be reduced resulting in a "bright reddish screen."

Until you can see a clear picture (with the ability to pick out individual scanning lines) in each CRT...this is usually what you CAN'T see if the tube is contaminated. It appears "cloudy," "blurry," "out-of-focus," "dim," etc.Cool


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sdonaldson
New User

Feb 28, 2010, 1:18 AM

Post #3 of 9 (1162 views)
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Re: [jts1957] bright white screen [In reply to] Can't Post
exactly what is going on thank you for your info


jts1957
Veteran


Feb 28, 2010, 11:50 AM

Post #4 of 9 (1155 views)
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Re: [sdonaldson] bright white screen [In reply to] Can't Post
Coolant change & cleaning will be required.Wink


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sdonaldson
New User

Mar 6, 2010, 4:03 AM

Post #5 of 9 (1136 views)
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Re: [jts1957] bright white screen [In reply to] Can't Post
done coolent change now i can't get + to line up will not go up or down but it will go side to side. will new ic's solve this problem also looks like northen lights at bottom of screen
[code


(This post was edited by sdonaldson on Mar 6, 2010, 4:20 AM)


jts1957
Veteran


Mar 6, 2010, 4:35 AM

Post #6 of 9 (1132 views)
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Re: [sdonaldson] bright white screen [In reply to] Can't Post
Going back to your comment on brightness being too bright... How high are the screen (G2) controls?

In regards to "+" not go up/down, Did it work correctly before coolant was changed?


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sdonaldson
New User

Mar 6, 2010, 3:13 PM

Post #7 of 9 (1127 views)
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Re: [jts1957] bright white screen [In reply to] Can't Post
no the "+" did not work before the change and the G2 controls are about half way.


jts1957
Veteran


Mar 6, 2010, 4:53 PM

Post #8 of 9 (1122 views)
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Re: [sdonaldson] bright white screen [In reply to] Can't Post
Changing the ICs (and checking the bias resistors and any fuses) should get the "+" to adjust in all four directions for both the red and blue.Cool


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Location: Far, Far Away


sdonaldson
New User

Mar 7, 2010, 1:08 AM

Post #9 of 9 (1114 views)
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Re: [jts1957] bright white screen [In reply to] Can't Post
on the red + the first four rows on the left will not move the rest will move fine

 
 
 


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