Question about ViewSonic G70fmb (Black) 17" CRT Monitor

1 Answer

No color red displays.

I've had a Viewsonic G70fmb graphic monitor for a while. It's really been a wonderful CRT monitor...extra-fine .21 dot pitch.

Suddenly, it has lost the ability to display the color red. Naturally, all the colors now no longer display properly, though the monitor itself otherwise works fine. Any ideas? I could take it apart and fix something, if I new what to look for.

Bill

Posted by trail_run326 on

  • trail_run326 Aug 05, 2008

    Thanks for the great trail of items to check! Maybe I'll get lucky and it's one of the first few (though unlikely, as I've removed and jiggled the cable a number of times, as well as opened up the case and moved things around a bit). Still, it was working wonderfully and faithfully before the color red just suddenly decided to take a hiatus.



    I appreciate your detailed tips. I'll follow your list and see if anything turns up...



    Thanks again.

  • Anonymous May 13, 2009

    I have an Optiquest Q19wb and all of a sudden lost the ability to display red. I've had the monitor for atleast 2 years, maybe 3, and now everything is in greens and blues. I'll try the solutions posted.

×

Ad

1 Answer

Wesley Gardner

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 659 Answers

If you think that electronic repair is very difficult to learn then you have to read this article where only by using a solder gun could solve a Monitor color problem. Of course there were many tough dog cases (very difficult to find out the fault) in electronic repair but at the same time there were also many cases that can be solve by some simple ways. This G70fmb Monitor came in with no blue color problem. How do I know if the blue color was missing? Simply run a color test (that you may also download from the internet) or from a Monitor testing program generator, you could clearly see as which of the color is missing when you run the color bar test.
A missing blue color in the Monitor could cause the display to turn yellowish. Troubleshooting color problem is one of the easiest in Monitor repairing. Whether the missing color is from blue, red or green there are some areas that you need to check in order to successfully repair it. Here are some of the points that you need to check:
- A bended color pin at the VGA connector. (If pin one is bend then there would be no red color)
- A defective VGA signal cable. If the internal wires were broken then there would be missing colors. You can check if the signal cable is good or bad by doing a continuity test using a multimeter.
- Dry joints in the CRT board such as in the CRT socket pins, video pre amp and driver IC and even at the connector pins. In fact this problem contributed about 80% of Monitor color problems. Applying fresh solder would usually solve the color problem.
- A defective IC either in the Video Pre-amp or Video Driver IC.
- Faulty components in the CRT board. It could be a shorted driver transistor or even electrolytic capacitors that the ESR reading had shot up!
- A bad CRT socket. Sometimes decayed glue could cause the internal pins rusted and thus affecting the colors. Replacing only the CRT socket would definitely solve the problem.
- A weak or a defective picture tube (CRT tube). Yes, I do came across one of the electron gun (most probably the cathode materials had used up) in the tube faulty caused a missing color in the screen. There’s no way to repair this type of problem-the only way is to replace the CRT tube.
- In the newer type of Monitor, color setting is save in the EEPROM IC . Thus, if the EEprom data is corrupted, you would also get a missing color! The only way to repair it is to reprogram the IC or use a soft jig to tune it back the color setting.
Now, which one of the above is the easiest to start with first when comes to troubleshooting the color problem? I believe you would agree with me that the first, second and the third are the easiest compare to the rest. Normally I would hit the Monitor with my bare hands to see if there are any changes in color at the display (be careful not to hit too hard till the casing broken). If there is a change or flashes then I can say that the Monitor has dry joints. And if it stills the same no matter how many times I hit it, I will then starts check the VGA connector and the cable.
In the above Monitor, the problem was dry joints because when I softly hit it with my hand at the side of the Monitor, the blue color immediately appears. The aluminum shielding at the CRT board was opened and I could clearly see lots of dry joints especially in the video pre amplifier and the video driver IC. When you resolder please don’t just touch on the IC’s only, you need to resolder others area as well like the CRT socket pins. Doing this would prevent any color loss again in the future. A good job would prevent call back and to save you time and money and most of all your reputation!
After everything was done, you then need to gently knock at the CRT board again with the plastic handle of the screw driver to see if the color problem still exists. You may also knock on the main board just in case there is any dry joints there. One more thing, if you find that the Monitor is a bit dusty, you may use a vacuum cleaner and a brush to clean up the dirty area.
Whether you are repairing the g70fmb or any other brand of Monitors, if you come across any monitor color problem, you can always use the procedure above to find out the fault. If the VGA signal cable is okay and there were no dry joints in the Monitor, I guess the only way is to use voltage testing method and start checking components with your tester or meter.

Posted on Aug 05, 2008

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

Tip

Monitor buying tips you should know.


Over the years monitors have transformed from those bulky CRT monitors to square LCD screens to stylish flat wide screen LCD's and now to new stylish extremely thin LED screens. On average every PC user spends at least 5 hours a day looking at the monitor. If the picture is fuzzy and not clear enough then there is a very high possibility that the eyes get damaged.

An older CRT monitor
slasher_x_51.jpg
A wide LCD monitor
slasher_x_49.jpg

A newer ultra flat widescreen LED monitor
slasher_x_50.jpg


Monitor Sizes
There are many different sizes of CRT, square LCD, wide LCD and wide LED monitors available on the market at the moment.

If you want an older CRT screen then sizes can range between 14" to about 20", they use the 4:3 aspect ratio.
If you want an older LCD screen then sizes can range from 15" to 19", they also use the 4:3 aspect ratio.
If you want a newer wide screen LCD then sizes can range from 18.5" to about 27" and even larger. They use the 16:9 if they are full HD or 19:10 if they are not ratio.
If you want a newer wide screen LED then sizes can range from 18.5" to about 27" and even larger. They also use the 16:9 if they are full HD or 19:10 if they are not ratio.

Image quality
The sharpness of the image in a monitor greatly depends on your Graphics card as well as whatever resolution you are running at. Nevertheless the quality of the monitor plays an important role.

Here are some of the tips that you should know before buying a monitor.

1. There are three types of monitors namely CRT, LCD and LED. The monitor that looks like a TV is a CRT monitor. In CRT monitors there is a Cathode Ray Tube that shoots electrons into the screen to create the image. An LCD monitor is smaller in width and consumes less power and is healthier if you are going to be spending large amounts of time at your PC. The LED screen looks the same as an LED monitor and the difference between it and the LCD is that it has a much higher contrast ratio resulting in darker blacks and much lighter whites.

3. A CRT monitor is much heavier than LCD monitor as you can imagine by it's bulky appearance. A LCD monitor is very lightweight and so is a LED monitor.

4. The distance between two adjacent pixels in a monitor is called 'dot pitch'. This is measured in millimeters (mm). Smaller the dot pitch the clearer the picture quality. Usually there are monitors with dot pitch varying between 0.20 mm to 0.27mm. Some manufacturers use diagonal dot pitch while most of them use horizontal dotpitch. The diagonal dot pitch is always longer than the horizontal dot pitch

5. Resolution of a monitor has to be considered with care. Most of the CRT monitors have resolutions of 800×600, 1024×768 and 1280x1024. The square LCD monitors have 1280×1024 and 1600×1200 resolutions. Newer wide screen LCD monitors have resolutions of 1600x1900, 1680x1050 and the Full HD 1920x1090. When the resolution is higher the images and text will appear smaller. But you can see more text and bigger pictures in the monitor with high resolution.

6. Another thing to note is the 'Refresh rate'. This rate is usually 60Hz, 73Hz, 75Hz, 85Hz. Refresh rate of 85Hz means the picture on the monitor is refreshed 85 times within a second.

7. The brightness and contrast can range between a low 5 000:1 to a high 80 000:1 in a LCD monitor and an average of 5 000 000:1 in a LED, yes that's 5 million to 1 with a LED. This just shows how much better a LED monitor is to a LCD.

8. If you are a gamer then the thing you have to look at with LCD monitors and LED monitors is the response time. If it is 16ms then this is a very bad monitor for gaming and you will experience a ghosting effect in most games and if it is 5ms then you will have an average gaming experience. What you want to get is a 2ms response time monitor, with it you will have the best gaming experience with no ghosting what-so-ever.

on Mar 06, 2011 | Computers & Internet

1 Answer

I have a viewsonic g810 21" crt and it will make a snapping noise and the screen will zoom in and back out. How do I fix it?


PLease press reset botton on your monitor display and see any different. hope you find a good result.

Jan 30, 2010 | ViewSonic G810 21" CRT Monitor

1 Answer

Unplugged monitor at one location and moved to a different location and the monitor will not work..... Tried a different monitor into the same PC and it worked fine. Viewsonic continues to go into power...


Sounds to me that it's a resolution problem. I think that the previous monitor that was hooked up to it last had a different resolution.

That or try restarting, it may need to install a driver.

Jul 10, 2009 | ViewSonic G810 21" SuperClear CRT Monitor

1 Answer

Powers on no pic


there are many cause for it 1/vj has gone change it to check it.2/ wp/vista progrram is damage repair it 3/ ram may be damage change it to check it. mother bord may be damage change it to check,prosser may be damage change it check. last u may change high graphic- press f8 then u can correct require graphic....thanks

Jun 13, 2009 | ViewSonic P810 21" CRT Monitor

1 Answer

ViewSonic G90f power-on confusion


crt monitor uses.vga port do you any laptops you can plug in and see if monitor actually works ... recently built pc so does that mean you shoved in another graphics card if so does your graphics card also have vga port, if it does try that

May 30, 2017 | ViewSonic Computers & Internet

2 Answers

DVI connection fault


I had the same problem, you must call Viewsonic to change your screen. The DVI input on the screen is dead.

Jul 08, 2008 | ViewSonic VX2255 Monitor

1 Answer

ViewSonic G810 21" CRT


if that is a new and have a waranty why did back to the store and need for the replacement if the monitor has a warranty ...so just bring that and need for replacement...

Jan 15, 2008 | ViewSonic G810 21" CRT Monitor

1 Answer

Viewsonic VA2012w Wont go into standby with computer.


turns out it may be a heating problem. cut a few extra vent holes in it and seems to be fine.

Sep 08, 2007 | ViewSonic VA2012WB Monitor

2 Answers

Vx900 viewsonic monitor problem . Blank screen except for power off/on


no, Viewsonic has the part for sale 42.99 - free shipping. Easy to replace

May 25, 2007 | ViewSonic VX900 19" Flat Panel LCD Monitor

Not finding what you are looking for?
ViewSonic G70fmb (Black) 17" CRT Monitor Logo

431 people viewed this question

Ask a Question

Usually answered in minutes!

Top ViewSonic Computers & Internet Experts

Ekse

Level 3 Expert

13434 Answers

Cindy Wells

Level 3 Expert

6101 Answers

Dimitar Todorov

Level 2 Expert

241 Answers

Are you a ViewSonic Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...