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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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horizontal white lines covering all of the TV screen
I have this tv that has parallel horizontal white lines that cover the
whole screen; they are spaced apart for most of the screen but get closer together up the top. I have replaced electrolytics in vertical section but no change. Whatelse could be causing this problem? Any info will be helpful. Thank you. |
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#2
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horizontal white lines covering all of the TV screen
Try the scan circuits...If we had the Make and Model
we could be more helpful. kip -- "Watch the return E-Mail addy its false" "AliTonto" wrote in message om... I have this tv that has parallel horizontal white lines that cover the whole screen; they are spaced apart for most of the screen but get closer together up the top. I have replaced electrolytics in vertical section but no change. Whatelse could be causing this problem? Any info will be helpful. Thank you. |
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#3
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horizontal white lines covering all of the TV screen
I beleive the vertical chip could be faulty.Have you checked Vcc?
Jim "john" wrote in message ... Try the scan circuits...If we had the Make and Model we could be more helpful. kip -- "Watch the return E-Mail addy its false" "AliTonto" wrote in message om... I have this tv that has parallel horizontal white lines that cover the whole screen; they are spaced apart for most of the screen but get closer together up the top. I have replaced electrolytics in vertical section but no change. Whatelse could be causing this problem? Any info will be helpful. Thank you. |
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#4
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horizontal white lines covering all of the TV screen
Hi John
The is part of an alarm clock radio Superstar Model and the board description is PB1001-H(Rev.3) I can identify the vertical chip AN5151N. If this is a possible suspect, could anyone give me the pinouts please. Thank you. AT "john" wrote in message ... Try the scan circuits...If we had the Make and Model we could be more helpful. kip -- "Watch the return E-Mail addy its false" "AliTonto" wrote in message om... I have this tv that has parallel horizontal white lines that cover the whole screen; they are spaced apart for most of the screen but get closer together up the top. I have replaced electrolytics in vertical section but no change. Whatelse could be causing this problem? Any info will be helpful. Thank you. |
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#5
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horizontal white lines covering all of the TV screen
thay are retrace lines, nothing to do with
the vetical chip. "AliTonto" wrote in message om... Hi John The is part of an alarm clock radio Superstar Model and the board description is PB1001-H(Rev.3) I can identify the vertical chip AN5151N. If this is a possible suspect, could anyone give me the pinouts please. Thank you. AT "john" wrote in message ... Try the scan circuits...If we had the Make and Model we could be more helpful. kip -- "Watch the return E-Mail addy its false" "AliTonto" wrote in message om... I have this tv that has parallel horizontal white lines that cover the whole screen; they are spaced apart for most of the screen but get closer together up the top. I have replaced electrolytics in vertical section but no change. Whatelse could be causing this problem? Any info will be helpful. Thank you. |
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#6
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horizontal white lines covering all of the TV screen
I had similar symptoms with my TV. Turned out to be a cold solder on a diode
that was part of the power circuit. It used to display this screen just before it cut out. -- Please remove your shoes to reply "Mr TUBEAMPS" youfinedout@thomuusnonsence wrote in message u... thay are retrace lines, nothing to do with the vetical chip. "AliTonto" wrote in message om... Hi John The is part of an alarm clock radio Superstar Model and the board description is PB1001-H(Rev.3) I can identify the vertical chip AN5151N. If this is a possible suspect, could anyone give me the pinouts please. Thank you. AT "john" wrote in message ... Try the scan circuits...If we had the Make and Model we could be more helpful. kip -- "Watch the return E-Mail addy its false" "AliTonto" wrote in message om... I have this tv that has parallel horizontal white lines that cover the whole screen; they are spaced apart for most of the screen but get closer together up the top. I have replaced electrolytics in vertical section but no change. Whatelse could be causing this problem? Any info will be helpful. Thank you. |
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#7
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horizontal white lines covering all of the TV screen
Sounds like what you're seeing are "retrace lines," which means the raster
could be turned up too high. See if adjusting the SCREEN control on or near the flyback helps a little. In effect, you're turning down the master brightness. |
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#8
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horizontal white lines covering all of the TV screen
Low 200v to the CRT will cause this as well; could be an open or changed value
resistor in the 200 volt circuit, usually powered by a winding/diode/filter cap off the flyback transformer. |
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#9
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horizontal white lines covering all of the TV screen
Yes, I think investigating the crt PCB further sounds hopefull; I will
check and return my results. Thanks to all. (BWL) wrote in message ... Low 200v to the CRT will cause this as well; could be an open or changed value resistor in the 200 volt circuit, usually powered by a winding/diode/filter cap off the flyback transformer. |
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#10
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horizontal white lines covering all of the TV screen
If by normal you mean the top 1/5 of the screen has a normal looking picture,
which then gets stretched further and further open as the image travels down the screen, then your problem now is in the vertical circuit; probably a bad capacitor, low voltage to the IC, or bad IC... |
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