I have a 10 year old 32" Magnavox that pincushions intermittently.
If you smack the housing it usually has an effect on the condition so I suspect a connector or other hardware problem.
Before I actually tackle taking this 200 pound TV apart I thought I'd ask for specific locations that may be suspect in the horizontal sweep section of the TV. Any suggestions?
Cracked solder joint(s) in the pincussion circuit. Usually it sits somewhere between the horizontal and the vertical sections.
I'd add to that, the fault should be attended to sooner rather than later as arcing and carbonised PCB is a possibility.
as
Use a nice long non-conducting stick to push on various "things" to see if you can locate the suspect area. It will cut down on the inspection time considerably if you don't have to inspect the entire chassis.
If you posted a model number it might help people as certain chassis's have certain problems more frequently.
Follow up:
Moved the heavy TV to a work bench and removed the cover. Very dusty. Vacuumed as much as possible. Will blow off the rest outside tomorrow. Prodded with fiberglass rod and found a sensitive area of the main board. Turned lights off and could just see a very weak spark that seemed to correspond to the intermittent pincushioning. The spark emanates from a hole in the circuit board where a diode lead goes through to the trace side. The diode is within the horizontal sweep section. Will get to the trace side of board tomorrow and hopefully will just have to re-solder the diode.
I love cheap fixes. To bad I scratched the heavy duty TV stand in the process of trying to move the beast.
Its advisable to remove the affected component and scrape its leads to make sure of a good clean solder joint.
Greetings tnom..
Regarding: "Will get to the trace side of board tomorrow and hopefully will just have to re-solder the diode."
Granted, this is unrelated, but while you've got the PC board out on the bench, IF you've got an ESR checker, you might want to check any of the nearby aluminum polarized electrolytics, especially after 10 years of heating and cooling. Reason being, it could save you some time getting back into the set to the same board if a electrolytic starts becoming intermittent (or fails completely) in a not too distant future. You and I both know Mr. Murphy and his Laws all too well!
At least something to consider..
Cheers, Mr. Mentor
| >If you smack the housing it usually has an effect on the condition so | >I suspect a connector or other hardware problem. | >
| >Before I actually tackle taking this 200 pound TV apart I thought I'd | >ask for specific locations that may be suspect in the horizontal sweep | >section of the TV. Any suggestions? | | | Follow up: | | Moved the heavy TV to a work bench and removed the cover. | Very dusty. Vacuumed as much as possible. Will blow off the rest | outside tomorrow. Prodded with fiberglass rod and found a sensitive | area of the main board. Turned lights off and could just see a very | weak spark that seemed to correspond to the intermittent | pincushioning. The spark emanates from a hole in the circuit board | where a diode lead goes through to the trace side. The diode is within | the horizontal sweep section. Will get to the trace side of board | tomorrow and hopefully will just have to re-solder the diode. | | I love cheap fixes. To bad I scratched the heavy duty TV stand in the | process of trying to move the beast.
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