Hardware Information |
|
Flyback Transformer-How to Locate the ABL Line
Whenever there is a complaint about monitorcontrast problem I will check on the flybacktransformer ABL (automatic blanking limiter)circuit.Sometimes a weak picture tube might causedcontrast problem. If the picture tube isgood, I will go straight to the contrastcircuit. The question is how do we findwhere the contrast circuit located? Simple,if you have a datasheet for the video pre-amplifier ic, definitely you can find the contrast pin. For LM1203N video pre-ampic the contrast pin is located at pin 12. Replace this ic or trace from this circuitto find the cause of the contrast problem. From experienced, usually capacitors shortedand resistor turned into high ohms were the caused of the problem. A video pre-amplifiercan also be defective. To confirm whether is circuit or ic problem, just solder out the contrast pin and switch on the monitor. If the monitor display normal picture (contrast ok)then suspect the abl line circuit. If it remainthe same (dim contrast) replace the videopre-amp will usually solve the problem. The contrast signal came from one of the pin(leg) of a flyback transformer which we calledit as abl pin. Many technicians have the difficulty to trace the abl pin becauseusually a flyback transformer consist of around10 pins. Some pins are B+, GROUND, AFC, ABL,X-RAY PROTECT, VCC, to HOT, HEATER, horizontalcentering and etc. But there is one and simpleway that i'm gone to show you how to locate theabl pin. Use two analog multimeters set to x10kohmrange. Connect it in series (+ probe to - probe)and measure the flyback transformer from anode(the red cap) to all of the pins under theflyback. You have to desolder all the pin orjust remove the flyback from the mainboard in order to get an accurate reading. If either one of the pin shows a diodereading that is the abl pin. The reason we usetwo multimeters is because the flyback circuitinternally have couple of high voltage diodesconnected in series. If you have a schematic diagram or any monitor or television troubleshooting book, you will see that theinternal flyback diode are connected in series.By connecting two meters the ouput from the probeis around 24 VOLTS which is enough power to checkthe flyback internal diodes. After you have determined the abl pin, you can proceed to followthe line and find the bad components that cause the contrast problem. Television or tv flyback transformer generallyhave the same design compare to monitor flyback.Whether it is a montblanc flyback transformer,rca, mitsubishi or sony flyback the checkingusually is the same. Jestine Yong is a electronic repairer and a writer. For more electronic repair information please visit his website at http://www.noahtec.com/electronic-repair-articles.htm
MORE RESOURCES: Nvidia RTX 4070 Ti with memory mod easily beats RTX 4080 in Superposition benchmark - Tom's Hardware Asus vows to improve clarity surrounding warranty claims and astronomical hardware repair costs Tom's Hardware Huawei brings sanctions-busting Kirin 9000C CPU to desktop PCs to replace banned Intel Alder Lake chips Tom's Hardware Bye Bye, AI: How to turn off Google's annoying AI overviews and just get search results Tom's Hardware Montclair hardware store to close after 131 years in business News 12 New Jersey My Mom and Dad Owned Competing Side-by-Side Hardware Stores. It Was a Lesson in Life. The Wall Street Journal OP police looking for 6 people involved in hardware store theft: WDAF FOX4 Kansas City Hardware Center in Paoli shutting down after nearly 73 years The Philadelphia Inquirer Ace Hardware Reports Increase in Q1 2024 Revenues Hardware Retailing Canyon ISD brings home hardware at UIL state tennis tournament Press Pass Sports Overland Park police searching for suspects in multiple thefts KMBC Kansas City Best Tech and PC Hardware Deals Tom's Hardware TSMC's third generation 3nm node on track — N3P mass production to begin later this year Tom's Hardware Schoolmeester, Diani bring home hardware for Banks | Sports | forestgrovenewstimes.com Forest Grove News times Intel-powered Aurora supercomputer fails to dethrone AMD-powered Frontier on Top500 list, again — claims spot as ... Tom's Hardware ACE HARDWARE REPORTS FIRST QUARTER 2024 RESULTS PR Newswire Three-year-old CPU beats Intel's fastest current chip in RAM benchmark — 7 GHz Core i9-11900K tops 8.3 GHz Core ... Tom's Hardware Best Webcams for 2024 Tom's Hardware Enthusiast gets Windows XP running on an i486 — merging two dinosaurs from different eras Tom's Hardware OpenAI's new assistant makes Apple's Siri look primitive, also announces GPT-4o and new desktop PC client (Updated) Tom's Hardware Massive Dell blunder leaks Intel and Nvidia's mobile roadmaps — Nova Lake, Panther Lake CPUs and GENxx Nvidia ... Tom's Hardware How Much Does It Cost To Open an Ace Hardware Franchise? 1851 Franchise Ace Hardware purchases 13 local chain store locations across central Illinois The State Journal-Register Melaco Sisters Hardware & Supplies Player of the Week: Zariell Pollard Lafourche Gazette DisplayPort 2.1 has a serious issue with UHBR-certified cables — it could explain Nvidia sticking with DP 1.4 on RTX ... Tom's Hardware CPU Benchmarks and Hierarchy 2024: CPU Rankings Tom's Hardware Western Digital rolls out new 2.5-inch HDDs for the first time in seven years: is 6TB the swan song for 2.5-inch hard ... Tom's Hardware US to increase tariffs on Chinese semiconductors by 100% in 2025 — officials say it protects the $53 billion spent on ... Tom's Hardware Homegrown European processor for supercomputers delayed by a year — chip upgraded to 80 cores, but timeline gets ... Tom's Hardware GPU Price Index 2024: Lowest price on every graphics card from Nvidia, AMD, and Intel today Tom's Hardware If you think PCIe 5.0 runs hot, wait till you see PCIe 6.0's new thermal throttling technique Tom's Hardware Ace Hardware Brunswick | Ads | fredericknewspost.com Frederick News Post Hardware Wildlife Education Center Utah Division of Wildlife Resources Microsoft offers to relocate nearly 10% of China-based staffers to the US or allied nations — AI and cloud engineering ... Tom's Hardware URI club sailing team heads to nationals, collects post-season hardware The University of Rhode Island Intel's 1500W TDP for Falcon Shores AI processor confirmed — next-gen AI chip consumes more power than Nvidia's ... Tom's Hardware Hardware visit Utah Division of Wildlife Resources PS5 Best-Seller, Sales Drop For All Consoles - Europe Hardware Estimates for April 2024 - Sales VGChartz Nintendo Switch hacked to run Windows 11 on Arm, and it's just about as awful as you can imagine Tom's Hardware Intel's new Thunderbolt Share provides file and screen sharing without hurting network performance Tom's Hardware Ace Hardware partners with Webster Parish Council on Aging for fan drive Minden Press-Herald Area softball teams in search of hardware at various state tournaments Moscow-Pullman Daily News Save up to 50% on BBQs, lawn mowers and garden essentials during Home Hardware's massive pre-summer sale Yahoo Canada Shine On Windows translator makes PC games run on Android — Fallout 4 demoed at 30 fps using Winlator app Tom's Hardware Curt's Ace Hardware Ribbon Cutting - Morristown, TN | Local News | citizentribune.com Citizentribune Our newest hardware office in Taiwan The Keyword | Google Product and Technology News OLED monitor momentum expected to continue — analysts expect 1.34 million units shipped by year end Tom's Hardware 5 Best Hardware Wallets for DeFi in 2024 CoinCodex Windows 11 24H2 will enable BitLocker encryption for everyone — happens on both clean installs and reinstalls Tom's Hardware Asus quotes ridiculous $2750 fee to replace chipped GPU power connector— docs back up claims of egregious repair ... Tom's Hardware Newcomer Campbell Collects Major Hardware in CAA Softball Postseason Honors Colonial Athletic Association Stack Overflow bans users en masse for rebelling against OpenAI partnership — users banned for deleting answers to ... Tom's Hardware Full scan of 1 cubic millimeter of brain tissue took 1.4 petabytes of data, equivalent to 14000 4K movies — Google's AI ... Tom's Hardware Nvidia's next-gen Blackwell AI Superchips could cost up to $70000 — fully-equipped server racks reportedly range up ... Tom's Hardware |
RELATED ARTICLES
Heliodisplay --Computer Video With No Screen Science-Fiction meets reality with this new video display technology.The Heliodisplay includes patented and patent pending technology to transform normal ambient air and display video images into free-space. Getting The Proper Laptop Screen Size Are you sick of viewing everything on that small screen that your current notebook comes with? Do you want your next laptop to have screen size that you are more comfortable with? Well read on.In this article we will take a look at all the common screen sizes found on the many various laptops currently in existence, as well as which ones may be best for you and why. The Top 10 Must-Have Laptop Accessories You've laid out good money for your laptop computer, but you're not done spending just yet.There are a few more laptop accessories you may want to consider to make the package complete. The Making of Energy Efficient Datacenters The Crooked E: The Unshredded Truth About Enron is a wonderful movie to watch. It is based on the book, The anatomy of greed, written by a former employee of Enron, Brian Cruver. What is Over-clocking a Processor? Q : What is over clocking?Overclocking is when you make your system processor run faster that its normal speed. This has many advantages and dis-advantages. Ink Cartridges - A Humble Beginning Computers and their accompanying printers were huge years ago. In the past toner reservoirs and toner cartridges were used instead of ink cartridges like those used now. Obsolete Is A Dirty Word (Intel Pentium 64 Bit Microchip) Get ready everyone, home computers are about to set new LAN speed records! The Intel 64-bit microchip will soon be powering the new line of Pentium 4 computers. This long awaited sizzling fast release will be heading to store shelves across America just in time for the new blazing fast Windows 64-bit operating system. Bluetooth Basics - Bluetooth Technology Tutorial Bluetooth BasicsBluetooth technology is nothing new, but in many respects it still seems to be more of a buzz word rather than a well understood, commonly accepted technology. You see advertisements for Bluetooth enabled cell phones, PDAs, and laptops, and a search of the Geeks. Two Essential Accessories For Notebook Computers A Good Notebook BagForget those that are bundled with your notebook computer. Getyourself a good notebook bag that is well-padded both on itsload-bearing straps, and 100% around the notebook itself. USB Drive Popularity So many people have small USB drives today, but what is the attracting of owning one?USB drives are very small rewritable storage media for your PC, they can be anywhere from 32 megabytes well over a gigabyte! Despite their growing storage capacity and lowering cost, they can quite literally fit on your keychain! To give you an idea on the size of these drives, they are roughly 3 inches long, under an inch wide and weight almost nothing!USB drives use one of the most common ports on the back of personal computers, the USB port has been in place for many years, and almost every computer built within the last 5-7 years should have a USB port on it. Most new computers have these ports installed on the front of their cases for easy access!USB drives require no additional software to make them work with a new computer, you just plug it in, and a few moments later a new drive will appear in the list of available drives (in My Computer). Build Your First Computer from Hardware Scratches Wow- if you do it first time and have some asset of time in your disposition - then go ahead and purchase motherboard, your favorite processor, memory, video card (probably it is better to purchase it external for advanced quality). You will also need computer case - first computer should probably go to the cheap one - with USB 2 ports from the front side - the only question - you might want to replace noisy cheap power supply with $50 dollars one. Inkjet Jargon Explained With all the technical terms out there, it is becoming increasingly difficult to keep up with inkjet jargon. Unfortunately, understanding the differences between the various terminologies is a must in todays advanced technological age. HIPPA Goes Mobile and Wireless for Hospitals and First Responders It appears we need to further streamline health care and HIPPA now in effect is quite a nightmare trying to comply with and implement without making a mistake and possibly being sued as the trial lawyers testing the law. The Malpractice insurance rates may go up again. Choosing a Tape Drive Tape drives remain the leading technology used by organizations for backup and archiving. However, the plethora of tape drives on the market can make choosing the appropriate tape drive a confusing task. Testing Flyback Transformer - How to Test and When to Replace It Nowadays, more and more monitor comes in with flyback transformers problems. Testing flyback transformers arenot difficult if you carefully follow the instruction. Computer Hardware Preventive Maintenance Software Computers often break down at the worst of all times. These problems can be averted, or at least minimized with preventive maintenance. Review of Popular Wireless Headphones Just about everyone would I agree, I think, that wires on headphones are just about the most annoying wires associated with any electronic device. When you listen to music you don't want to have to stay in anyone one place, and you don't want to have to worry about cords tripping you are pulling your headphones down. How to Read Zener Diode Code Many technicians are confused on how to really read a zener diode code. There are many types of code number indicated on it's body. Buying / Selecting Computer Components This is the step takes the most time and consideration. Which parts do I buy? Which are best?There are many good places to buy computer parts. What is Blu-Ray DVD Video technology has increased significantly over the past years, and is continuing to grow at an incredible rate. Digital Video Disc's aka DVD's are the most likely the last big jump in consumer video technology that everyone is familiar with. |
home | site map |
© 2006 |