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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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Zenith Sentry 2 TV
"glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message ... Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for free. I've repaired monitor's and TV's before but nothing so far with this problem. If I leave the TV off for a day when I turn it on it shows a good picture for about 30 seconds, then horizontal lines of distrotion distort the picture (look like this: ---___________ ---___________ ---___________ there distrotions of the image being put on screen) and any graghic menus. There is a high pitched noise from the unit, If I turn it right back on the picture still has distrotion. I did a light hit test for joints and it didn't affect it, I still have to go through and check joints (will do soon). If I'm right this is a problem in the verticle circuit of this TV? Really all I'm woundering is a direction to go and any one who may have had a similar problem with this unit. I've not found exactly this problem on a group search through google. Any help and information would be great and I thank all who reply. -- -glasnostJDC Sounds like the Horizontal oscillator is going off frequency. Most likely a bad electrolytic cap. If you have an ESR meter you might be able to locate it. |
#2
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Zenith Sentry 2 TV
Has been addressed many times here. Do a Google groups search for
horizontal sawtooth and Zenith (possibly search by chassis or module number). C2212 maybe? a 22uf on the 9v line to the jungle ic. Of if it is really bright, the classic way the Zenith tubes short internally. A specific chassis number and year of manufacture will help a lot in narrowing down other possibilities. Model numbers mean very little for tv repair. David "glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message . .. Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for free. I've repaired monitor's and TV's before but nothing so far with this problem. If I leave the TV off for a day when I turn it on it shows a good picture for about 30 seconds, then horizontal lines of distrotion distort the picture (look like this: ---___________ ---___________ ---___________ there distrotions of the image being put on screen) and any graghic menus. There is a high pitched noise from the unit, If I turn it right back on the picture still has distrotion. I did a light hit test for joints and it didn't affect it, I still have to go through and check joints (will do soon). If I'm right this is a problem in the verticle circuit of this TV? Really all I'm woundering is a direction to go and any one who may have had a similar problem with this unit. I've not found exactly this problem on a group search through google. Any help and information would be great and I thank all who reply. |
#3
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Zenith Sentry 2 TV
So please give more details. Which is brighter? Is one too bright or too
dark? That set may have a limited service menu, early Zenith service menus did have eeprom value settings for rf brightness and video brightness. If the video input is low, you could have a weak capacitor in the video path. Too weak and the picture will roll. David glasnostJDC JDC@(NO SPAM)cnyconnect.net wrote in message ... Oh for starters the modual number is 9-1118 and was made August 1991 the chassis I've read is the same as the model # for this series? I tryed to find it any way but no such luck. My last major problem is brightness differences between line level and coax inputs. Any suggestions? The capacitor was the fix (C2212) for my posted problem. But for this brightness difference problem I'm not sure, I've seen something posted before but it was all dead ends. I've got a couple of work arounds but I want to know if there is a knowen componant or componants that break down that cause that problem. Any help would be great and thanks to all agian who have helped this far. -glasnostJDC "David" wrote in message om... Has been addressed many times here. Do a Google groups search for horizontal sawtooth and Zenith (possibly search by chassis or module number). C2212 maybe? a 22uf on the 9v line to the jungle ic. Of if it is really bright, the classic way the Zenith tubes short internally. A specific chassis number and year of manufacture will help a lot in narrowing down other possibilities. Model numbers mean very little for tv repair. David "glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message . .. Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for free. I've repaired monitor's and TV's before but nothing so far with this problem. If I leave the TV off for a day when I turn it on it shows a good picture for about 30 seconds, then horizontal lines of distrotion distort the picture (look like this: ---___________ ---___________ ---___________ there distrotions of the image being put on screen) and any graghic menus. There is a high pitched noise from the unit, If I turn it right back on the picture still has distrotion. I did a light hit test for joints and it didn't affect it, I still have to go through and check joints (will do soon). If I'm right this is a problem in the verticle circuit of this TV? Really all I'm woundering is a direction to go and any one who may have had a similar problem with this unit. I've not found exactly this problem on a group search through google. Any help and information would be great and I thank all who reply. |
#4
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Zenith Sentry 2 TV
If the brightness is adjusted correctly for the line level input, the
coax input will be darker by a large amount. Is there a setting for this in the serivce menu, how is it accessed on this model? The screen does not roll at all. Thank you very much for all your help so far. -glasnostJDC "David" wrote in message ... So please give more details. Which is brighter? Is one too bright or too dark? That set may have a limited service menu, early Zenith service menus did have eeprom value settings for rf brightness and video brightness. If the video input is low, you could have a weak capacitor in the video path. Too weak and the picture will roll. David glasnostJDC JDC@(NO SPAM)cnyconnect.net wrote in message ... Oh for starters the modual number is 9-1118 and was made August 1991 the chassis I've read is the same as the model # for this series? I tryed to find it any way but no such luck. My last major problem is brightness differences between line level and coax inputs. Any suggestions? The capacitor was the fix (C2212) for my posted problem. But for this brightness difference problem I'm not sure, I've seen something posted before but it was all dead ends. I've got a couple of work arounds but I want to know if there is a knowen componant or componants that break down that cause that problem. Any help would be great and thanks to all agian who have helped this far. -glasnostJDC "David" wrote in message om... Has been addressed many times here. Do a Google groups search for horizontal sawtooth and Zenith (possibly search by chassis or module number). C2212 maybe? a 22uf on the 9v line to the jungle ic. Of if it is really bright, the classic way the Zenith tubes short internally. A specific chassis number and year of manufacture will help a lot in narrowing down other possibilities. Model numbers mean very little for tv repair. David "glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message . .. Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for free. I've repaired monitor's and TV's before but nothing so far with this problem. If I leave the TV off for a day when I turn it on it shows a good picture for about 30 seconds, then horizontal lines of distrotion distort the picture (look like this: ---___________ ---___________ ---___________ there distrotions of the image being put on screen) and any graghic menus. There is a high pitched noise from the unit, If I turn it right back on the picture still has distrotion. I did a light hit test for joints and it didn't affect it, I still have to go through and check joints (will do soon). If I'm right this is a problem in the verticle circuit of this TV? Really all I'm woundering is a direction to go and any one who may have had a similar problem with this unit. I've not found exactly this problem on a group search through google. Any help and information would be great and I thank all who reply. |
#5
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Zenith Sentry 2 TV
If the brightness is adjusted correctly for the line level input, the
coax input will be darker by a large amount. Is there a setting for this in the serivce menu, how is it accessed on this model? The screen does not roll at all. Thank you very much for all your help so far. -glasnostJDC "David" wrote in message ... So please give more details. Which is brighter? Is one too bright or too dark? That set may have a limited service menu, early Zenith service menus did have eeprom value settings for rf brightness and video brightness. If the video input is low, you could have a weak capacitor in the video path. Too weak and the picture will roll. David |
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