Question about Hitachi 43FWX20B 43" Rear Projection Television

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Hitachi 43fwx20b intermittent vertical hold loss...humidity?

I purchased a Hitachi 43 projection tv a few years ago. It was a floor model with no remote, so i got a good deal.  While under warranty it began having a problem.  Upon powering up it would lose its vertical hold and show odd scrambled images.  Sometimes it would happen right away,  somtimes it would take about 30-45 seconds before it would wack out.  Here is the another wierd thing.  It only happens in the summer.  Never in the winter.  So i thought it might be a humidy issue as i live by the water.  Some times when i turn it off and on again it goes away.  Sometimes not.  Sometimes when i place a fan behind the tv it eventually goes away.  A tech came to my house and thought he fixed it.  About 3 weeks later it did it again.  then the winter came and it was fine.  Next summer it began again.  I video taped the problem sent it to Hitachi and showed it to a local tech who took my tv into the shop for over a month with no fixes.  They finally said that it could be something but it would cost a lot and my warranty was over.  It hasn't happened in a while but it is really annoying.  Anyone with any ideas as to what is wrong??

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KIT10 $29.50
Repair Kit for Hitachi convergence Chassis DP-14G
KIT10 Includes 2 pcs STK392-150 , 1 each of the following 1W axial lead fusible resistors:


http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Posted on Dec 05, 2007

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1 Answer

Our tv will all of a sudden go black but we will have sound whats wrong? it is a Hitachi model # 43fwx20b


bad high voltage circuit. the audio is on a different power supply circuit so you will still get sound. refer to service tech

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1 Answer

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Your vertical amp is failing and you will have to get it replaced. If your TV is under warranty, i suggest contacting the shop or manufacturer and get it fixed/replaced.

If not, then you will need to contact a qualified TV repairman to replace the vertical amp for you, as i wouldn't recommend opening the TV set to try a DIY..

Hope that helps. Should you have any further queries, pleas post back, and I will try to assist you as best I can..

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The convergence board is bad. Replace the STK voltage regulators and any associated discolored resistors.

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Jerry G.

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I have a similar pblm. But your first step is to power on with tv's button. Look into the back through holes and look for 4 green and 1 red LEDs lit. If not there are 3 fuses on the power supply board.Fuses can be easily changed.
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