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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Re: Hitachi 43fwx20b intermittent vertical hold...

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:

Posted on Dec 05, 2007

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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

Aug 22, 2011 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Hitachi 43fwx20b

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..

Jun 12, 2008 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Tv has a 3d look what can be done to fix it hitachi 43fwx20b

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

Mar 13, 2010 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Hitachi Projection Color TV 43FWX20B - COLOR OFF

Check all cables,replaced all cables if more than couple years old.After that the same,ur tv have one dead color gun,require service.

Jan 01, 2010 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

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Mine just developed the same problem.. did you find a solution/fix?

Jul 09, 2009 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Picture problem

Most likely there is a strong possiblity that the vertical scan amplifier for the observed colour channel is starting to fail. An experienced TV tech who works on your model type can fix this.

Any fault is fixable. It is a question of the amount you are willing to spend, and the avialability of parts from the manufacture.

Jerry G.

May 25, 2008 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Hitachi 43FWX20B

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.
next step call service.

Apr 16, 2008 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

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It is the shutdown protection circuit detecting that a component has failed, either the Hot (horz output transistor) or the DC Bias circuit has failed . you will need a tech.

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3 Answers

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My Hitachi Tv 43fwx20b turn on but not have sound and picture

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