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mathew spencer
Joined: 27 Mar 2005 Posts: 1
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Posted: Sun Mar 27, 2005 2:09 am Post subject: National Model TC-2186 MR -Display powers off after 10 mins |
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This TV has been operating problem free up to end 2004 (purchased 1991).
Has developed this problem about three months back.
Display holds good -perfect with no problem or distortion in picture . About 10 mins into operation suddenly the colour guns converge to the centre and screen goes blank. A humming noise ensues. When switched off and left for about 3 minutes and re-powered works perfect again and same thing happens. (but if re-powered within a shorter time it is the balnk screen & the humming noise)
I have taken the back cover off & viewed the inside - not touched anything. I can see probably the degaussing wires traversing the CRT from behind.
Is this a degaussing problem ? - or any other quick trouble shooting advice is welcome.
_________________ mathew spencer |
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Posted: Fri Jan 27, 2006 8:05 pm Post subject: National Tc 2186 |
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I had this problem a week ago and solved the problem by sweep soldering because i found quite a lot of dry joints but the cause is dry joints in the LOPT section for sure I found the HOT transistor dry jointed and a supply for the hot dry jointed as well. I do not have a manual for the set but if you need assistance i can open the back of the set and see what components i have re soldered. |
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