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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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TV - Non Constant White Screen. Sound Works as does PIP.
Ok so heres the deal
Early 90's Proscan TV. About a week ago my TV started to display a solid white background with no retrace lines. The sound works fine along with all menus and tv features. Ex: I can change the channels and the channel number will pop up in the upper right hand corner in full color or the menu system will display in the spectrum of colors as intended. Sometimes the tv will lose the white screen and display the correct image, however this is rare. PIP works well and it displays 2 seperate images as they are meant to be displayed, however when PIP comes on the background turns from white to a medium gray. Im not really sure where to go with this one. Could it be the ABL? TV White Screen(Mostly Constant). With Sound. PIP Works (2 Seperate images). |
#2
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TV - Non Constant White Screen. Sound Works as does PIP.
Nubly wrote: Ok so heres the deal Early 90's Proscan TV. About a week ago my TV started to display a solid white background with no retrace lines. The sound works fine along with all menus and tv features. Ex: I can change the channels and the channel number will pop up in the upper right hand corner in full color or the menu system will display in the spectrum of colors as intended. Sometimes the tv will lose the white screen and display the correct image, however this is rare. PIP works well and it displays 2 seperate images as they are meant to be displayed, however when PIP comes on the background turns from white to a medium gray. Im not really sure where to go with this one. Could it be the ABL? Does it do it with an Svideo input(channel 90)? www.techdata-kicksass.net TV White Screen(Mostly Constant). With Sound. PIP Works (2 Seperate images). |
#3
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TV - Non Constant White Screen. Sound Works as does PIP.
Yeah it does it with any input. Input 1 or 2. Any coax input or analog
OTA. Does it do it with an Svideo input(channel 90)? www.techdata-kicksass.net TV White Screen(Mostly Constant). With Sound. PIP Works (2 Seperate images). |
#4
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TV - Non Constant White Screen. Sound Works as does PIP.
Nubly wrote: Yeah it does it with any input. Input 1 or 2. Any coax input or analog OTA. Does it do it with an Svideo input(channel 90)? www.techdata-kicksass.net TV White Screen(Mostly Constant). With Sound. PIP Works (2 Seperate images). Ok, in case you think they're all the same, I know it's going to be there on video 1/2 and tuner. If you have good video on Svideo, channel 90, then the comb filter is the problem. If it really is there on Svideo, then measure the G1 voltage on the crt, but if the pip screen shows up, that most likely isn't the issue. G1 should be roughly 18 to 22 volts dc. www.techdata-kicksass.net |
#5
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TV - Non Constant White Screen. Sound Works as does PIP.
Tech Data wrote:
Ok, in case you think they're all the same, I know it's going to be there on video 1/2 and tuner. If you have good video on Svideo, channel 90, then the comb filter is the problem. If it really is there on Svideo, then measure the G1 voltage on the crt, but if the pip screen shows up, that most likely isn't the issue. G1 should be roughly 18 to 22 volts dc. www.techdata-kicksass.net Yeah, the Svideo(90) is also white. The PIP will be on svideo and the image will be black as required, and the background will still be on a channel playing correct sound on the gray background. Ill tear the belly of the beast open tonight and see what i can find. |
#6
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TV - Non Constant White Screen. Sound Works as does PIP.
How does one test the G1 voltage and where can i locate a test point.
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#7
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TV - Non Constant White Screen. Sound Works as does PIP.
"Nubly" wrote in message oups.com... How does one test the G1 voltage and where can i locate a test point. Is that the G-Spot? But seriously - Grid 1. Assuming you are not talking triacs, http://www.repairfaq.org/sam/crtfaq.htm or http://www.angelfire.com/electronic/...Multigrid.html if not a Kine. |
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