Circuit Board
How do I find the vertical beam circuit board in a TV?
I have a 31″ JVC television. It was given to me not working (single white line running horizontally across the screen). I took off the back and blew the dust off the circuitry and it started working for the most part. Every once in a while, the screen will compress to a solid line and a tap on the side fixes it.
I have discovered that this is probably caused by a dry solder in the vertical beam circuitry, but I cannot find a circuit board labeled with anything similar. I have found the audio circuit, etc., but no vertical beam.
Does anyone know the approximate location, or the circuit board label of this so I can begin to look for loose resistors and such? If I could get a location with a reference point of looking in the back of my TV: back right, upper left, on the back of the picture tube, etc.
Thanks.
You must be Canadian….only they describe cracked solder connections as “dry”…..
Here’s a couple tips to find that vertical output IC ……
First it’s normally a 5 pin to 13 pin IC found near the center of the board, not found on the outside edge of the left or right side. It’s located near the yoke plug…the one with the red/blue/green/yellow wire….it’s thick wire with a big black plug on it….LARGER than all the other plugs…that’s because the PINS are larger too.
Look at the yellow / green plug….those are the vertical connects….trace them to the vertical output where you’ll find the cracked connections..
Now…..you know what the IHVT is? That’s the HIGH VOLTAGE transformer….SOME older TV sets use the 28 Volt line from that transformer to supply the Vertical output…and there is a resistor and diode to create that power….find it and solder it…..
Now, you can find a TV tech and he’ll do it for around $100… BEFORE you damage the vertical output and taking out the power supply too…..which will cost an additional $ 40 to $50.
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Printed Circuit Boards (PCB) and their Manufacturing Process
For many types of electronic and computer devices printed circuit boards are the basis. Printed circuit boards are composed of conductive layers. These layers are made of copper. Each layer is divided by an insulating layer and then laminated together to form a printed circuit board. On the boards there are drilled holes which are called “vias”. These “vias” are electroplated to make the connection electrical. The PCB manufacturing process is very complex and complicated process.
Circuit Board Manufacturer starts with a substrate and then place a copper layer. On placing a copper layer on it they “etch” that layer to remove the unnecessary copper, leaving the proper amount of copper area required for the application. Then the proper quantity of vias is drilled into the layers with either a tungsten carbide drill or a laser. Any areas of the board where components will be placed are plated. With a screen printing process texts are printed on the board. Then these boards are ready for testing. After completion of testing process these boards are ready for components for the desired application. This whole process is called as “populating”.
History of Printed Circuit Boards
An Austrian engineer named Paul Eisler was the inventor of printed circuit boards. He made his first PCB in the 1930’s. He completed his graduation from Vienna University in 1930. The company named Camberwell lithography offered him a contract. The contract gave the privilege to his idea away to the company. Finally, his invention was noticed by the US military and then they integrate this technology into bomb detonators to counter German improvement in the field.
Applications
PCB circuit design was mainly used in military applications. Nowadays PCB’s are used as the basis for millions of components that includes computers, mobiles, radios, televisions etc. If you open any electronic device, you will find a green colored board with copper colored lines and dots i.e. printed circuit board.
Any industry you name, Printed Circuit Boards have become an integral part of the processing world.
For rectifying all your ball grid array problems, contact www.pcbassemblydepot.com. Hey provide you with all the solutions related Circuit Board Design. They have been into business since 1994 and provide hardware and services of Electronic Assembly, Cables/Harnesses, Contract Manufacturing, Turnkey Manufacturing and Consulting Services
About the Author
For rectifying all your ball grid array problems, contact www.pcbassemblydepot.com. Hey provide you with all the solutions related Circuit Board Design. They have been into business since 1994 and provide hardware and services of Electronic Assembly, Cables/Harnesses, Contract Manufacturing, Turnkey Manufacturing and Consulting Services
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