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Toshiba 25E3DH - Blurry picture on cold startup....SOLVED!    
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akaming



Joined: 24 Jul 2010
Posts: 3
Location: Hong Kong

PostPosted: Sun Jul 25, 2010 12:19 am    Post subject: Toshiba 25E3DH - Blurry picture on cold startup....SOLVED! Reply with quote

Toshiba 25" CRT TV
Model 25E3DH

Picture totally dark and blurry for the the first half hr or so from a cold start (ambient 30C (86F), 80% RH). Gradually picture quality is regained to 100%. Sound is normal and there are no other clicks or zaps from within the TV. I have opened it up and tried to speed up the warmup with a hair dryer aimed at all areas of main circuit board and CRT board but picture did not immediately show any improvement (although I'm not sure how long I should've applied the heat).

I've read elsewhere on this forum that capacitors in the power supply section responsible for picture focus tends to drift with temperature changes once aged so I'm hoping someone can help me confirm this and identify which cap I should be looking at replacing......

Thanks in advance!

Some pics of the internals...





Last edited by akaming on Sat Jul 31, 2010 10:30 pm; edited 1 time in total
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akaming



Joined: 24 Jul 2010
Posts: 3
Location: Hong Kong

PostPosted: Mon Jul 26, 2010 10:09 am    Post subject: Reply with quote

this is how the picture appears on initial start up...





btw, there's supposed to be a row of subtitles on the lower edge of picture....

does anyone out there know whats causing this?
akaming



Joined: 24 Jul 2010
Posts: 3
Location: Hong Kong

PostPosted: Sat Jul 31, 2010 6:36 am    Post subject: Toshiba 25E3DH - Blurry picture on cold startup.... SOLVED! Reply with quote

turned out to be oxidation on the high voltage wire connection inside the CRT socket.... replacing the socket did the job! credit however goes to my local tv guy - he told me the humid weather was to blame.

Here's a shot of the old socket - notice all the gunk on the solder post:

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