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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Zenith SR2765s no blue
Anyone have a euras account on here? i have a zenith sr2765S that has no
blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#2
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Zenith SR2765s no blue
27" Zenith crt from 1993 through late 96? Troubleshoot for bad crt FIRST as
that is the most likely cause. Then do standard troubleshooting of the video output stage and pre-driver stages. David Mike wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#3
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Zenith SR2765s no blue
not CRT. subbed it.
"David" wrote in message ... 27" Zenith crt from 1993 through late 96? Troubleshoot for bad crt FIRST as that is the most likely cause. Then do standard troubleshooting of the video output stage and pre-driver stages. David Mike wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#4
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Zenith SR2765s no blue
Just a suggestion here... The best way to troubleshoot this is to first see
if the bias volts to the CRT elements are okay. If so, use a scope and trace back the video signal along its path in the blue channel. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#5
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Zenith SR2765s no blue
Then it looks like you just need to do basic crt drive voltage and
waveform troubleshooting. "Mike" wrote in message ... not CRT. subbed it. "David" wrote in message ... 27" Zenith crt from 1993 through late 96? Troubleshoot for bad crt FIRST as that is the most likely cause. Then do standard troubleshooting of the video output stage and pre-driver stages. David Mike wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#6
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Zenith SR2765s no blue
not CRT. subbed it.
It will be tomorrow :-) |
#7
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Zenith SR2765s no blue
found the problem.
2 open resistors feeding the base drive. and feedback. you are right about the CRT. the colors are funky. and in dark scenes, the green lacks, such as when watching twister, the grass and trees are sorta dark purple. but at certain scenes, the green is there. like in whites, whites have too much green. and yellows are there. peoples faces are too red. if i drop the red gain, it takes out the red from teh darker scenes. the colors are hard to describe. but its teh green that lacks in darker images. and the picture is somewhat dim. even when the green drive is all the way up, the whites are swamped in green. and the blacks are sorta faint red instead of black. go figure. "Jerry G." wrote in message ... Just a suggestion here... The best way to troubleshoot this is to first see if the bias volts to the CRT elements are okay. If so, use a scope and trace back the video signal along its path in the blue channel. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#8
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Zenith SR2765s no blue
no bleeding or blooming, and the convergence is fine. the corners arnt out
of focus. commonly, i see bad convergence, and out of focus corners when bad CRTs are present. "Mike" wrote in message ... found the problem. 2 open resistors feeding the base drive. and feedback. you are right about the CRT. the colors are funky. and in dark scenes, the green lacks, such as when watching twister, the grass and trees are sorta dark purple. but at certain scenes, the green is there. like in whites, whites have too much green. and yellows are there. peoples faces are too red. if i drop the red gain, it takes out the red from teh darker scenes. the colors are hard to describe. but its teh green that lacks in darker images. and the picture is somewhat dim. even when the green drive is all the way up, the whites are swamped in green. and the blacks are sorta faint red instead of black. go figure. "Jerry G." wrote in message ... Just a suggestion here... The best way to troubleshoot this is to first see if the bias volts to the CRT elements are okay. If so, use a scope and trace back the video signal along its path in the blue channel. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#9
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Zenith SR2765s no blue
there isnt any bleeding or blooming, and the convergence is fine. the
corners are not out of focus. commonly, i see bad convergence, and out of focus corners when bad CRTs are present. There are purity problems in the extreme corners. i cant get that out whatsoever. "Mike" wrote in message ... found the problem. 2 open resistors feeding the base drive. and feedback. you are right about the CRT. the colors are funky. and in dark scenes, the green lacks, such as when watching twister, the grass and trees are sorta dark purple. but at certain scenes, the green is there. like in whites, whites have too much green. and yellows are there. peoples faces are too red. if i drop the red gain, it takes out the red from teh darker scenes. the colors are hard to describe. but its teh green that lacks in darker images. and the picture is somewhat dim. even when the green drive is all the way up, the whites are swamped in green. and the blacks are sorta faint red instead of black. go figure. "Jerry G." wrote in message ... Just a suggestion here... The best way to troubleshoot this is to first see if the bias volts to the CRT elements are okay. If so, use a scope and trace back the video signal along its path in the blue channel. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#10
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Zenith SR2765s no blue
Usually the 120k 1/2 watt resistors are open on these.........CRT may still
look like crap. Evaluate with a CRT tester to be sure. -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#11
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Zenith SR2765s no blue
it does look like crap. the green gun is too weak. the whites are flooded
with green, and the 50% or less required of green, it doesnt show. "Shoreline Electronics" wrote in message . com... Usually the 120k 1/2 watt resistors are open on these.........CRT may still look like crap. Evaluate with a CRT tester to be sure. -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
#12
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Zenith SR2765s no blue
so basically, browns look purple. and dark greens look like a dark purple.
you can only see the first 3 shades of green. the rest are just shades of purple. "Mike" wrote in message ... it does look like crap. the green gun is too weak. the whites are flooded with green, and the 50% or less required of green, it doesnt show. "Shoreline Electronics" wrote in message . com... Usually the 120k 1/2 watt resistors are open on these.........CRT may still look like crap. Evaluate with a CRT tester to be sure. -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "Mike" wrote in message ... Anyone have a euras account on here? i have a zenith sr2765S that has no blue. output transistor checks fine. it lists this issue in euras, but i had to cancel subscripton. help...please.... |
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