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Question about Hitachi 27FX48B 27" TV

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No Vertical Sweep

I have a Hitachi 27FX28B.. when I turn the television on the picture is fine, within 3-5 minutes though - the picture compresses to a thin vertical line across the middle of the screen (audio is fine). The television is 8 years old.. what is the problem and is it worth fixing?

Posted by Sameer Rao on

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Anonymous

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The verticle output iC or the b+ feed is going bad. To fix it your gonna need a multimeter and experience working with tv. Now to its worth??? do you like the set? Does it have all the fetures and fuctions that you liokeand how good is the picture? It shount cost ya more the 125 to 150 for this repair. Good Luck

Posted on May 27, 2006

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This is not a vertical sweep output problem. Check and replace all the supply filter capacitors at the secondary side power supply section to SMPS.
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If model is correct here, a few questions:

If you have sound or not?

if on screen display shows or not?

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The set is prone to a few odd issues as well as some common ones.

If you follow power cord inside (ought to go to board mounted on right side wall) there are at least 3 black power relays on that board that are known to stick either open or closed---tapping on them will sometimes cause them to function again for a while---ie if power light does not go out etc.

If you have sound the set will be likely turning off or blanking all three picture tubes for a reason= no vertical sweep or horizontal sweep as that would instantly burn a mark on all three tubes--check the possible relay issue and let me know answers to the questions I have asked above.

I have worked on a lot of this model set and am familiar with it.
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about the only common issue (if model listed here is correct) is bad solder connections at the vertical output IC.

Usually in this case jarring the set will cause it to try to open and allow the picture--if no vertical sweep (pic top to bottom) set will blank all 3 tubes to prevent an instant burn mark on them.
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DOES POWER LIGHT COME ON AND STAY ON?

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