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 LG 710E LG 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 LG 710E 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.
Watch the video related to CRT Monitor
yeah, another video whith the old 4″ CRT tube, this time, I have a Wii hooked up to it.
Help answer the question about CRT Monitor
Any issues connecting an older crt monitor to new system?I am purchasing a new HP Pavilion Slimline Desktop Computer and was initially planning on connecting my Gateway CRT monitor until purchasing new LCD flat screen. Could this cause any problems to either the CRT or PC?
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January 2nd, 2010 on 5:38 am
I don't think it would have any detrimental effect, however it is always good practice to power off any electrical equipment when leaving it.
LUg.
January 2nd, 2010 on 6:04 am
i wish i could have all of those speakers lol….
January 2nd, 2010 on 6:13 am
aww por old CRT Monitor.
January 2nd, 2010 on 6:31 am
There is no chance of any damage to the transmitter, but the CRT may pick up interference. So just hook it up and if the image on your CRT is fine, its all ok, if it seems distorted, jut keep it away
January 2nd, 2010 on 9:15 am
Yeah, i think OLED is thin film, whereas “normal” LEDs are conventional monolithic. But pixels can die on LCDs as well, of course. And yes, video projectors are another great display method.
January 2nd, 2010 on 1:06 pm
Exactly! YOU’RE a true thinker…..
January 2nd, 2010 on 6:17 pm
Energy Requirements: LCD monitors are extremely economical when it comes to power consumption. Their consumption is in the region of 25 -50 watts compared to CRT which consume like 60-80 watts for a 15 inch model to almost 70 to 150 for 17 and 19 inch models.
January 3rd, 2010 on 1:26 pm
yeah, stuff that can all be reused. you can make a fairly cheap tesla coil just from the flyback transformer alone with some other parts.
January 3rd, 2010 on 6:09 pm
A friend of mine had the same problem…it use to make such noise attimes..largely b4 windows bootup. He eventually had to get it repaired.
So i suggest you the same get it repaired. It wont cost u a lot.
January 3rd, 2010 on 10:02 pm
Replace the monitor as soon as possible. Until then, NEVER leave it powered on while you're away. CRT monitors can actually begin to BURN inside if there is an electrical issue. The smell is atrocious and you could risk a fire.
January 4th, 2010 on 3:23 am
It will not cause any major issues.
The only possible problem is if the monitor is REALLY old and not capable of displaying at least 800 x 600 resolution. But those are rare these days.
January 4th, 2010 on 3:32 pm
@SpeakerVoiceCoil yeah, i can agree to OLED but once that certain LED dies, you cant fix it but i believe OLED works differently than what a regular LED does and is almost more like plasma but without the doping and other flaws. id love DMD/DLP tv sets as they have to be the most simplest out of all tv’s ever made
January 4th, 2010 on 9:43 pm
Could the clicking actually be a spark? A quick zap? That would explain the flicker. This might be dust inside, but it could be some worse sort of electrical failure. If you open it up, let it sit Off overnight. CRTs can contain lethal voltages and big capacitors can hold a charge overnight at least. I think I'd just replace it with a new LCD monitor.
January 4th, 2010 on 9:58 pm
lol thanks. vac tube tvs are rarely made anymore since flat panel is less expensive and doesnt contain any dangerous chemicals in it because of the RoHS Act.
January 4th, 2010 on 11:44 pm
I am watching this through a catode tube. I still prefere the old tubes to the different sorts of flat schreens. I just like the colours better. yet this is an amazing plant.
January 5th, 2010 on 1:42 am
Your eyes get tired after using a CRT for so long is due to the way the picture is made.
In a CRT a cathode ray tube "draws" line on the screen about sixty times a second. Fast enough that our eyes don't notice any lag. The problem is the pictures is never truly in the exect same spot everytime. The variation is so slight that we done consciously notice it but subconsciously our eyes are constantly searching and refocusing on the picture about twenty times every second. This constant motion is what causes the eye strain you feel.
With an LCD, the picture is very static, meaning it has zero variotion on where the picture is. It stays in the exact same spot. Since our eyes don't have to keep moving, it greatly reduces eye strain.
A CRT and LCD put out no more radiation than each other and those have no effect of eye strain as our eyes respond to energy only in the visable spectrum. Any energy put out as "radiation" would not effect the eyes as they're not made to function in that energy spectrum.
January 5th, 2010 on 5:08 am
Use an LCD monitor rather than a CRT. Most of us are probably using LCDs today anyway, but if you are using a CRT, consider switching. LCDs use less energy than CRTs. You can easily tell simply from the amount of heat a CRT produces.
The standard refresh rate on VGA-capable monitors (which is all of them by today’s standards) is 60Hz whether you’re using CRT (tubed) or LCD (flat panel).
With CRT, 60Hz is by far the worstrefresh rate to use because many suffer from what I call the “60Hz headache”. When you have a CRT set to this standard refresh rate there are many (myself included) that will develop a “dull” headache after about 30 to 45 minutes of use. In addition you may hear an almost inaudible high-pitched squealing noise. The cure to this ill is to change the rate to 70, 72 or 75Hz. The dull headache will go away and the noise will be gone.
Those who have been using computers long enough (particularly at work) most likely have specially coated eyeglasses to combat against the ills of using a CRT at a 60Hz refresh. While this helps, changing the rate to a higher hertz is highly advised.
With LCD, the best(usually) refresh rate to use is 60Hz. It’s the exact opposite of CRT. I only switched to 59 because it presented a better look to my eye.
While it’s true CRT still has certain advantages (it’s still the best computer gaming monitor to date as there’s no such thing as “ghosting” on CRT), LCD is far better as far as your health is concerned. There’s no “crackle” of static discharge when the monitor is shut off, the power consumed is far less, and it’s far better for your eyes.
January 5th, 2010 on 8:02 am
That’s right.
I don’t mind LCDs, but I’m waiting until OLED displays are common. They seem to promise CRT’s contrast ratio (or more), and, of course, no distortion or geometry adjustments!
January 5th, 2010 on 10:19 am
CRT, without a doubt. But, there are a couple of new LCD screens that I read about that are supposed to be pretty good. They cost something on the far side of $2,000, if I recall.