Question about Hitachi 50SBX70B 50" Rear Projection Television

1 Answer

Intermittent video dim video usually on turn on then gets normal after a few minutes,but then goes dim again on channel change. ,

Posted by on

  • John Leonard Feb 13, 2008

    the crt's are very dim when the video is dim, and very bright when video is normal

  • John Leonard Feb 13, 2008

    could you give me the comb filter removable board location or board number thank you


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has answered 200 questions.


    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 206 Answers

There is a problem with a video processing board on this set, to repair this usaly means replacing up to 30 capacitors on this board and they are all surface mounted a very fragile, bust bet on this one is to take it in to the shop

Posted on Feb 13, 2008

  • Mike Owens
    Mike Owens Feb 13, 2008

    Yep ..... All video signal run thru what is called the 3YD/C Comb filter, this is a removable and most the times a repairable board, it sits on the signal board, however the ability to remove and replace all the defective capacitor usaly fall way beyond the scope of the backyard Tv repair guy. And being as I see this set is now 11 years old if it gets messed up you most likly will not be able to find a replacment


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Mitsubisho WS-55908: Cable coming in can be plugged into either "ANT-A" or "ANT-B". What happens now is that the signal goes out for a few minutes at a time, usually after I change a channel. This also...

You might have a bad regulator on the signal board or a bad button on the front of the tv. The AV RESET button will make the screen go black and if it is malfunctioning can cause this symptom. Bad solder (cracks) can also cause this. Lastly I have changed a few regulator for different problems. Near the back left side (while behind tv) on a small heatsink. Goodluck.

Jul 05, 2010 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

My Samsung hcn4226w won't stay on.

There are many protective circuits inside the set that will shut it down if a problem is detected. It sounds like there are intermittant detections of problems and the "restart" temporarily clears the problem. If the unit is no longer under warranty, open up the back with the set unplugged and try reseating all of the boards and connectors. The trip may have jared a few things loose. Update this with the results.


Aug 20, 2009 | Samsung HCN4226W 42" Rear Projection...

1 Answer

No Picture - only sound

I have a TV at work that has been doing the same thing here's how I've been getting it to show a picture:

turn the TV on then quickly change it to an input channel (like front or etc) that doesn't have anything connected to it. Let it sit there for a few minutes, then change it to a regular channel and see if you have a picture.

Apr 26, 2009 | Hitachi 61SWX10B 61" Rear Projection...

1 Answer

The color suddenly turns red for few minutes then goes back normal and goes back and forth intermittently on my hitachi 57f500 tv.

Hello edgarhelen1,

This could be a problem with the Red tube (Grid to Cathode short). I would suggest that you have the tube checked. However if you have a CRT tester you could do this yourself. I any event this sounds like a CRT issue.

Nov 15, 2008 | Projection Televisions

1 Answer

Samsung rear projection tv st47w3p picture dims after few minutes

ok this is how u fix that problem it is a heat issue what u need is a can of 50 below freez u can use this on the circuit to find witch part is breaking down i dont think u will have a problem in the power supply it sounds like something in the video circuit that is causeing the problem. i hope this hp marty

Jul 25, 2008 | Panasonic PT-51HX41 51" Rear Projection...

1 Answer

40H80 Toshiba Rear Projection TV

it sounds as if it is solder related, bur hard to say for sure. You ay need a service manual to actually trouble shootthe power supply and opeating circuits. I will post a lnk where you can get a service manual emailed to you

Feb 09, 2008 | Toshiba 40H80 40" Rear Projection...

1 Answer

Tv Audio & Video go off and by using remote channels or sound etc...back on

sounds like a solder problem where the tuner attaches to the chassis. Or possibly a weak capacitor in the video circuit. If youd like a service manual for the set let me know . I know where to send you to get it for 10.99. Hope this helps

Dec 22, 2007 | Mitsubishi VS-50603 50" Rear Projection...

1 Answer

Red screen

sounds like a picture tube problem its a problem that probably cant be fixed only by a professional

Nov 30, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Multiple images

I don't think your problem had anything to do with the storm!!
I had problem with my Mitsubishi ws-55809 I was getting bowing color bands. It was an intermittent problem. I pulled out the video board out of the set. Not to bad of job just make notes on connections. I soldered the video driver. It was big and had many connections. Most where loose. My set has worked for about 5 months without any problems.

Aug 27, 2006 | Mitsubishi WS-55809 55" Rear Projection...

Not finding what you are looking for?
Projection Televisions Logo

Related Topics:

57 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Hitachi Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides