Antony
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Dec 10, 2004, 6:22 PM
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Zenith a60m91w yellow/green tint during intense white picture
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From the TV repair forum copied to the Proj TV Repair forum
Anyone else have similar problems or solutions to these issues
a60m91w.
#1.worked well 3 yr,warr exp.,video failed sound ok
service replaced 9-1978 or 9-1674 on bill(flyback fail)
now out of service warr. during BRIGHT white screens
ie. Hockey rink covering 50% of screen picture will tint
yellow or greenish over 2-3 seconds, once subject screen changes to non-white background picture returns to 100% normal. Is there an adjustment.
#2. Vertical stripe all the time on left hand side 1" wide. Appeared after board service exp. constant.
Guest
Unregistered User
Nov 12, 2003, 12:57 AM
Post #2 of 8 (539 views)
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Re: [TONY] Zenith a60m91w yellow/green tint during white - NEW [In reply to] Quote | Reply
additional info from last night
screen "tinting" is worse on high brightness settings
Service menu 9876 enter works 80 set items
menu 11/17/98 TE=10110100 a-018728-04 1.3
board replaced was 009-01978-01 "large signal brd"
problem during hockey only when top of picture is on white ie. player zoom in. on general rink shot with fans on top of picture not bad. tinting fades in 2-3 seconds then goes away 2-3 sec when top of pic darker again. (less noticeable in weak sig or movie mode settings, worst in daylight or sports settings)
#2 vertical bar on left hand remains when service horizontal picture shift is done code 69. discoloured stripe top to bottom appears darker than rest of picture
Guest
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Nov 21, 2003, 9:28 AM
Post #3 of 8 (524 views)
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Re: [Guest] Zenith a60m91w yellow/green tint during white - NEW [In reply to] Quote | Reply
vertical stripe disappeared whenthe horizontal adjustment POT was "adjusted" what else? on 1678 board. two pots at front vertical and horizontal
Still going yellowish it seems when the overall brightness of the picture increases.
I remember someone mentioning a brightness protection circuit to prevent tube damage if the picture was too bright. Is there a parameter or adjustment for that????
Guest
Unregistered User
Dec 2, 2003, 2:21 AM
Post #4 of 8 (511 views)
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Re: [Guest] Zenith a60m91w yellow/green tint during white - NEW [In reply to] Quote | Reply
change R5102 on green video output module. This is 120k 1/2 w resistor located near video output transistor. Board accessible behind speaker grill
Guest
Unregistered User
Dec 16, 2003, 5:53 AM
Post #5 of 8 (500 views)
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Re: [Guest] Zenith a60m91w yellow/green tint during white - NEW [In reply to] Quote | Reply
 Thanks I will try that
Another symptom: During a dark (black) screen I can faintly see blue diagonal lines.
Maybe 6-10 each spaced 4-6 inches apart or so from bottom to top of the screen
Does this shed any more light on the problem?
What problem does the resistor fix solve?
Thank you
Guest
Unregistered User
Dec 18, 2003, 8:51 AM
Post #6 of 8 (498 views)
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Re: [Guest] Zenith a60m91w yellow/green tint during white - NEW [In reply to] Quote | Reply
change R5102 on all three video boards while you are at it. This should solve all your problems
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Re: [Antony] Zenith a60m91w yellow/green tint during intense white picture
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