 |
| Powered by phpBay Pro |
Monitor Color Problem - How To Repair LG710E CRT Monitor With Blue Colour Missing
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.
About the Author
Find out more information below.
LCD and Electronic Repairs are very Easy for everyone and Highly Profitable too. You can learn all the secrets easily.
Find out How to Repair A LCD Monitor - Find out the Secrets!
Learn Electronic Component Testing.
|
 100 Machine made Teflon tube socket 4Pin 300B 2A3 101  US $772.00
|
 50012AX7 12AU7 9 Pin AMPS Silver TUBE SOCKETGZC9 F US $650.00
|
 Western Electric 4 pin tube socket pair sockets 2 US $500.00
|
 50 Machine made Teflon tube socket 4Pin 300B 2A3 101 US $435.00
|
 500pc CMC 4P Tube Socket Gold Pin Hex Snap φ27x13mm Hole US $412.00
|
 500pc CMC 4P Tube Socket Gold Pin Hex Snap φ35x13mm Hole US $412.00
|
 200CERAMIC 8 PIN LOCTAL TUBE SOCKET 35Y4 35A5 7N7 8Y8 US $326.00
|
 50Ceramic 5 Pin AMP Tube Socket Aa Ba Be Cd Ce DaSP5 US $299.00
|
 200Vacuum Tube 8 Pin Socket for EL41 EF41 ECC408Y9 US $281.00
|
 10012 Pin Tube Socket PCB For 50CA10 6CA10 Radio12F A US $275.00
|
 100Ceramic 12 Pin Tube Socket For 9MN8 8AC9 AMP 12F 1 US $275.00
|
 100 Tube Relay Socket OMRON PLE08 0 8pin PCB soldering US $273.50
|
 50 GOLD 7 Pin 813 Radio Ceramic Vacuum Tube Socket7AG US $268.00
|
 100 EL34 KT88 274B 6550A 8 PIN GOLD OCTAL TUBE SOCKET US $264.00
|
 50 Machine made 4 pin Ceramic tube socket 300B 2A3 US $255.00
|
 50 Machine made 9 pin Ceramic tube socket 12AX7 6922 US $255.00
|
 50 Machine made 8 pin ceramic tube socket KT886SN7 US $255.00
|
 100 Tube 9 Pin Socket for 12AX7A 12AU7 6DJ8 9ZG US $248.00
|
 500pc CMC 8P Tube Socket Glod Pin Hex Snap 2x10mm Hole US $247.00
|
 Gold Plated 12 pin Compactron Tube Socket Lot of 100 US $235.00
|
 50Vintage 10 Pin EURO Tube Socket EL156 EL12 AZ12Y10G US $228.00
|
 10012AX7 12AU7 9 Pin GOLD AMPS TUBE SOCKETGZC9 F G US $218.00
|
 507 Pin 813 FU 13 Radio Ceramic VALVE Tube Socket7A US $218.00
|
 Gold Plated 9 pin Ceramic PCB Tube Socket Lot of 200 US $210.00
|
 50 Vintage 4 Pin Phenolic Plastic Tube Sockets NOS US $200.00
|
 100Vacuum Tube 7 Pin DIY PRE AMPLIFIER Gold SocketFG7 US $199.00
|
 50AMP Gold 6 Pin Ceramic Vacuum Valve Tube Socket61G US $199.00
|
 50Vintage 10 Pin EURO Tube Socket EL156 EL12 AZ12Y10 US $199.00
|
 508 Pin Side Contact Tube Socket AZ1 EL1 EF6 CT8AU8G US $199.00
|
 100x 9PIN TUBE SOCKET SAVER FR 12AX7 12AU7 ECC82 ECC83 TS 9 US $199.00
|
 40 8 Pin to 4 Pin Tube Socket for 300B 2A3 811GZS8 S4 US $189.00
|
 50pcs4 Pin to 8 Pin Tube Socket FOR KT88 6550 EL344 8 US $185.00
|
 PKG50 4 Pin to 8 Pin Tube Socket for KT88 6550 EL34S8 US $183.00
|
 100 Tube Relay Socket OMRON PL11 11pin soldering pin US $180.50
|
 1008 PIN CERAMIC Amplifier TUBE EL34 KT88 274B SOCKET US $178.00
|
 130 8 Pin Ceramic Tube Socket for KT88 6550 EL34A8Y1 US $178.00
|
 50Gold 4 Pin Ceramic Tube Socket 300B 2A3 811AGC41 US $178.00
|
 Gold 9 pin Tube Socket Separate Collar Lot of 100 US $175.00
|
 Gold Plated 8 pin Loctal Loktal Tube Socket Lot of 100 US $175.00
|
 Gold Plated 8 pin Octal Ceramic Tube Socket Lot of 100 US $175.00
|
 100pcs OMRON 8 PIN Bakelite Tube Relay Socket PL08 10A US $174.50
|
 PCK 200 7 PIN AMPS TUBE SOCKET METAL ALUMINUM COVERS US $174.00
|
 811R G Tube 4 Pin Tube Base GOLD Socket 50 pcs 300B US $169.00
|
 130For EL34 KT88 274B 8 Pin Ceramic TUBE SOCKETS8PS US $168.00
|
 130For EL34 KT88 274B 8 Pin Ceramic TUBE SOCKETS8PR US $168.00
|
 130For 12AX7 12AU7 9 Pin AMPS Silver TUBE SOCKET9PC US $168.00
|
 130pcsPreamp Ceramic 7 Pin Valve Vacuum Tube Socket7F US $168.00
|
 100EL34 KT88 274B 6550A 8 PIN TUBE Ceramic SOCKET8MPC US $168.00
|
 10012AX7 12AU7 GOLD Valve Tube 9 Pin Panel SocketGZC9 US $168.00
|
 1008 Pin Ceramic Tube Socket KT88 6550 6SN7 EL348Y 3 US $168.00
|
 100 8 Pin Ceramic Tube Socket KT88 6550 6SN7 EL34C81 US $168.00
|
 130For 12AX7 12AU7 9 Pin AMPS Silver TUBE SOCKET9PCs US $167.90
|
 100 8 Pin Ceramic Tube Socket for KT88 6550 6SN78MP US $166.00
|
 100 8 Pin Ceramic Tube Socket KT88 6550 6SN7 EL3481A US $166.00
|
 100 8 Pin Ceramic Tube Socket KT88 6550 6SN7 EL348Y3 US $166.00
|
 100 8 Pin Ceramic Tube Socket KT88 6550 6SN7 EL348Y5 US $166.00
|
 100 8 Pin Ceramic Tube Socket KT88 6550 6SN7 EL348Y7 US $166.00
|
 1008 Pin Valve Tube Socket DIY KT88 6550 6SN7 EL348Y4 US $166.00
|
 100PRE AMP VALVE Tube 8 Pin Socket KT88 6550 EL348Y6 US $166.00
|
 13012AX7 12AU7 9 Pin AMPS Silver TUBE SOCKETGZC9 F US $166.00
|
 12 pin Compactron Ceramic Tube Socket Lot of 100 US $165.00
|
 50Ceramic Gold 12 Pin Tube Socket For 9MN8 8AC912F G US $164.00
|
| Powered by phpBay Pro |