Question about Hitachi 50SBX78B 50" Rear Projection Television

1 Answer

Hitachi 50SBX78B Horizontal lines and bow

Hi This has a line clear picture on the top 80% of the screen But the bottom has slight red shadow (convergence?) also has a hourglass effect starting ,,now the Lines,,they go across the whole screen about 1/4 way down many lines about 4-5 inch wide distorts picture right there . the rest is a perfect picture ,, this set has this digital Convergence Magic button , does this system clear up Bad STK IC's this well while causing the lines ?

Posted by on

  • johnmk13 Feb 08, 2009

    I made a slight adjustment to Horizontal lines are gone hit the service button grid appers I see the red looks good ,, green and Blue are way off in top left and bottom left ,, so Looks like Convergence IC's must be the ticket ,, any one know which ones are used in this set ? looks very time consuming to get at them in this set ,, Huge board , heat sink clamped totally around them no #'s visable

  • johnmk13 Feb 12, 2009

    OK I Put the IC's in ,, Resistors didn't show any signs of heat, burn ,, the blue is still messed up,, looks like it's over sized flashing and blurry ,, while in magic focus the text is stretched off the screen ,, only the blue ,, as I wait for it to discharge before I go back and remove the board again for a better look at my work, is there something in general I might have over looked ?




×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 150 Answers

John, Hitachi site is down at the moment, if you remove the clips on the front of the IC`s you will see the numbers of the convergence ic`s, and yes they are a pain to get out, they are probably stk 392-110`s if they are the originals, you`ll have to un-solder 36 pins total to get them out, check for burnt resistors in the general area of the ic`s and replace any that are burnt before turning the set on,be sure to order a tube of "heat sink compound" to apply to the back of the new IC`s, once on the set will probably still look poor, this is normal, run the set for minimum of 15 minutes then push the " magic focus button " inside the front door panel, after it has finished running magic focus it should look great, video-tek

Posted on Feb 09, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Samsung TSL2793HF - Slight Right Side Pincushion and Horz Line Bottom to Top Until the TV Warms up


Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---

Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.

Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.

Dec 02, 2012 | Televison & Video

1 Answer

Horizontal lines shadowed / blured picture after 20-30 minutes


There are some semiconductors or capacitors that are leaky. Might need thorough check up inside the TV.

Jul 07, 2012 | LG 55LH40 55 in. LCD HDTV

1 Answer

My 52" RCA P52937SG screen bows on the top and on


What you are describing can be due to a number of different settings.

Focus on the red and green guns
Sharpness on the red and green guns
Horizontal position and size
Vertical position and size.

Please consult a professional for adjustment on these items as they are all near or connect to parts that have Hazardous Voltage.

Mar 22, 2011 | RCA P52937 52" Rear Projection Television

1 Answer

I have a Hitachi 46F500 tv and the red crt bowed


I just had the convergence replaced and have a great picture

Aug 16, 2009 | Hitachi 46F500 46" Rear Projection...

1 Answer

Picture at top of screen, bottom half is black...middle of screen has horizontal red, green line which is slightly bowed upward. model # is GE 46gw948


Call a good TV Tech and tell him the Convergence Amp IC's need to be replaced. Should not cost over $325.

Jul 29, 2009 | Televison & Video

1 Answer

Red bowed horizontal lines


Projection sets have two very common problems outlined below.

The first common problem is convergence

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. The TV can also shut down when the convergence starts to fail.

Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith, RCA and others.


You can more info and a DIY convergenece repair kit with instructions from TV Repair Kits using the link at the end of this article.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped or bowed
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

May 17, 2009 | Hitachi 43GX01B 43" Rear Projection...

1 Answer

Tv is messed up


I got a question.

Do you have any stereo speakers anywhere near your television?

This sounds like something a magnetic field could cause from speakers being too close to the tv.

If so try to relocate them and see if the problem goes away.

Jun 15, 2008 | Hitachi 57SWX20B 57" Rear Projection...

1 Answer

My screen have some red lines


I will assume from you description that this is a rear projection crt(picture tube) tv. if this is true I have good news/bad news.
faint red horizontal bowed lines in the picture indicate the screen(G2) voltage for the red tube is too high.Slight lowering of the G2 adjustment will eliminate these lines. I stress SLIGHT because too much adjustment will mess up the gray scale .
The bad news the red crt made be bad. if the adjustment works but in the future the problem reappears then suspect the red crt.red crt replacement is probably not economical to repair.

Jun 09, 2008 | Mitsubishi WD-52525 52" Rear Projection...

1 Answer

Red bow on top and bottom of 61dx01b


Convergence amp ic bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.hdtvoice.com/voice/showthread.php?t=28929
Or send to ptscorp.com
http://www.hdtvoice.com/voice/index.php?s=

good luck
please mark the post with a fixya

Feb 20, 2008 | Hitachi 61SDX01B 61" Rear Projection...

2 Answers

Red Lines On Screen of Hitachi 43FDX01B


can we see a picture of that?? I dont understand whatyour saying about the lines.. Are they differant colors or all red and do they make the pic bow?? does the pic look or have a reddish tinge to it?? is ther too much red in the picture??? Please let us know or let us see??

Apr 11, 2006 | Hitachi THE SOLUTION 3511 Projector, Mount...

Not finding what you are looking for?
Televison & Video Logo

148 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Televison & Video Experts

Jaime Hernandez

Level 3 Expert

2296 Answers

The Knight
The Knight

Level 3 Expert

72620 Answers

matt martin
matt martin

Level 3 Expert

1207 Answers

Are you a Hitachi Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...