Question about ViewSonic PJ458D Multimedia Projector

2 Answers

PJ458D Displays Multiple Lines and scrambled picture

My projector recently started showing horizontal lines across the screen after it has been on about half an hour. The lines flash on and off and get bigger. It looks like the "white noise" image on your standard television if I leave it on about 45 minutes. I've stopped using it. What's wrong and how do I fix it?

Posted by on

  • Aladdin Minic
    Aladdin Minic May 11, 2010

    What do you mean by "White Noise" image?



×

Ad

2 Answers

White noise-the image you get when you turn your television to a channel that isn't receiving a signal. Sorry, this is an old term for on-air televisions. Its kinda the same image you get when your DirecTV signal gets scrambled during a thunderstorm.

Posted on Sep 20, 2008

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 61 Answers

Take out the comb filter and replace the surface mount electrolytic capacitors on the comb filter and put it back in the motherboard. MCM sells a kit with capacitors that fix this problem.

Posted on Sep 21, 2008

  • Aladdin Minic
    Aladdin Minic Sep 21, 2008

    The frequency, regardless of which color the lines are should be in sync and not have a White Noise image.

    In signal processing, a "comb filter" adds a delayed version of a signal to itself, causing constructive and destructive interference. The frequency response of a comb filter consists of a series of regularly-spaced spikes, giving the appearance of a comb.

    Since the "electrolytes" evaporate, design life is most often rated in hours at a set temperature.
    For example, typically as 2000 hours at 105 degrees Celsius (which is
    the highest working temperature). Design life doubles for each 10
    degrees lower, reaching 15 years at 45 degrees. Most Electrolytic capacitors are rated for 85 degrees Celsius maximum.




  • Aladdin Minic
    Aladdin Minic Sep 21, 2008

    That is if your up to soldering......

×

Ad

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 Technician 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 repair professionals here in the US.
click here to Talk to a Technician (only 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

So I have a 50 Lg ( LG 50LN5700). There is still a picture however about every 3 seconds it goes from regular to blurry and repeats. There seem to be about 3 black lines across the top horizontally about 3...


To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

Oct 23, 2017 | LG Televison & Video

1 Answer

Samsung Plasma Lines and Colors on Screen


yes it can fix. its only loose connections from LCD connectors. trust me. romsky79@yahoo.com

May 29, 2009 | Samsung HP-R4272 42 in. Plasma HDTV

1 Answer

Horizontal Lines scrolling on screen


I had a similar issue with my Mitsubishi HD 1080. My power supply went out, I had it replaced and it works like new. However, just today I had AT&T U-Verse installed. When the cable guy was showing me the new HD channels all seemed good. This evening (about 5 hours after being installed) I started seeing these horizontal lines across my screen. The picture was still HD quality, but those annoying lines just wouldn't go away. Anyway, after reading a few blogs on-line suggesting interference or bad grounding, it hit me!!! The AT&T guy who installed my U-Verse (cable, internet and phone) had set the modem on top of my TV!!! It was just starring at me this whole time. So I removed the modem off the top of my TV and put it on a side table just to see what would happen and sure enough the lines were gone!!! You may not have the exact same problem, but it may be some type of interference (cell phone, modem, etc, either on top or around your TV that is causing the issue... Hope this helps. Thanks.

Oct 31, 2008 | Televison & Video

1 Answer

Horizontal white lines across top of TV screen


Vertical hold circuit is failing.

Check capicitor in vertical hold circuit. You should have solid knowledge of electronics repair before attemping repair. TV's can emmit harmful radiation, and produce voltages up to or in excess of 30kV.

Oct 07, 2008 | Televison & Video

3 Answers

Horizontal white lines across top of TV screen


Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.

Sep 15, 2008 | Panasonic CT-2006S 20" TV

1 Answer

Heavy white lines accross the screen


change the ram and viedo card agian

Jun 07, 2008 | Computers & Internet

1 Answer

Hitachi 51GWX Scrambled Picture


STK392-560 STKS convergence CHIPs Replace both of them.

Feb 24, 2008 | Hitachi 51GWX20B 51" Rear Projection...

Not finding what you are looking for?
ViewSonic PJ458D Multimedia Projector Logo

530 people viewed this question

Ask a Question

Usually answered in minutes!

Top ViewSonic Office Equipment & Supplies Experts

jasbo
jasbo

Level 3 Expert

2237 Answers

The Knight
The Knight

Level 3 Expert

74844 Answers

color wheel light...
color wheel light...

Level 2 Expert

138 Answers

Are you a ViewSonic Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...