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National Model TC-2186 MR -Display powers off after 10 mins

 
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mathew spencer



Joined: 27 Mar 2005
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PostPosted: Sun Mar 27, 2005 2:09 am    Post subject: National Model TC-2186 MR -Display powers off after 10 mins Reply with quote

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.

Sad
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PostPosted: Fri Jan 27, 2006 8:05 pm    Post subject: National Tc 2186 Reply with quote

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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