The power pack module type is easy to diagnose because you can replace another working unit just to make sure is the power pack that giving problem. You may also use an external dc power supply to power up the LCD to confirm if the power pack is faulty. If you do not have the external dc power supply, you can always use this method to isolate the problem especially the symptoms are no power, low power and power blink. Using the rear light bulb (12 volt) from a car and connect it to the power pack output jack. If it light brightly then the power pack is okay. If it blink or dim the power pack have problem. Why have to use this method to test it? Because, if there are components shorted or leaky at the LCD main board, it will affect the power supply performance.
From experienced, most of the LCD power supply problems whether in the power pack or built into main board were due to the failure of electrolytic capacitors (most probably due to heat) in the primary and secondary section. Most of the capacitors have a high ESR which causes the power supply to produce low output, blink or no power at all. Typical value electrolytic capacitors in the primary side are 47 and 100 micro farad 50 Volt and the secondary sides are 1000 to 2200 micro farad 25 volt. Sometimes you can see the capacitor top casing became bulge and the sleeve that covered the capacitor casing turned into darker color like brownish.
The power section in some of the LCD screen are still using the UC3842 pulse width modulation (pwm) ic. This type of ic is quite easy to find in the market compare to some power ic which is very difficult to get. Samsung 153V LCD monitor is using the TOP247F power ic which is quite easy to troubleshoot if power fail in this model. Some power pack that came in only have minor burnt and after cleaning it and replaced the fuse, it will work as good as the new one.
Troubleshooting LCD power supply is not that difficult provided if you know how a power supply work. If you are unsure of how to troubleshoot power supply, I urge you to read all my power supply articles at the power supply page. I will continue to post more power supplies articles at that page and hope you could drop by more often to check out my website.
2011年12月4日 星期日
2011年11月28日 星期一
Epson PH eyes mass market for new 3D projectors
The two 3D home theater projectors – the Epson EH-TW6000 and the Epson EH-TW8000 — will be available starting December 2011.
Although the units have a price tag of P160,000 and P119,000, respectively, the company said their cost is still much cheaper compared to existing 3D projectors which are being sold from P300,000 to P500,000.
The 3D models are just two of the 17 new projectors which Epson announced in the Manila leg of the company’s largest-ever projector launch in Southeast Asia. The other models are targeted at different parts of the market such as schools and businesses.
The EH-TW6000 and EH-TW8000 are Epson’s first-ever 3D projectors. With a form factor that is slimmer compared to other 3D projectors, the units can be used in the homes.
By upgrading projector shutter systems from 240Hz to 480Hz, the company said it was able to make the technology viable for home use, as well as solve a common 3D concern with slower projectors (240Hz) on maintaining image brightness and picture quality.
Epson said the time is already ripe for the launch of the 3D projectors with the dramatic increase in the amount of 3D content being produced, as well as the more mature level of 3D as a technology.
A feature which Epson officials highlighted during the launch was the ability of the Epson EH-TW8000 to convert 2D movies to 3D.
The Epson EH-TW6000, the more affordable alternative to the higher-end EH-TW8000, meanwhile has the brightest 3D images in its class as it shares the same image engine of the EH-TW8000 with a 480 hertz refresh rate.
Although it lacks the 2D to 3D conversion capability and the advanced Epson image processing technologies like Super Resolution Technology and Frame Interpolation that the EH-TW8000 offers, it has a pair of 10 watt high quality speakers and auto color mode.
Also at the launch event, held at the Dusit Hotel in Makati City, the Japanese tech firm also unveiled the Epson MG-850HD – the world’s first Apple device HD projector — which allows owners of iPhones, iPads or iPods to dock their devices onto the projector for playback of movies, photos or music.
The projector also features built-in 10W speakers, and a brightness of 2800 lumens, a contrast ratio of 3,000:1, and a resolution of up to 1280×800 (WXGA) — along with a microphone port, for those who would like to use the projector for karaoke or business presentations.
Although the units have a price tag of P160,000 and P119,000, respectively, the company said their cost is still much cheaper compared to existing 3D projectors which are being sold from P300,000 to P500,000.
The 3D models are just two of the 17 new projectors which Epson announced in the Manila leg of the company’s largest-ever projector launch in Southeast Asia. The other models are targeted at different parts of the market such as schools and businesses.
The EH-TW6000 and EH-TW8000 are Epson’s first-ever 3D projectors. With a form factor that is slimmer compared to other 3D projectors, the units can be used in the homes.
By upgrading projector shutter systems from 240Hz to 480Hz, the company said it was able to make the technology viable for home use, as well as solve a common 3D concern with slower projectors (240Hz) on maintaining image brightness and picture quality.
Epson said the time is already ripe for the launch of the 3D projectors with the dramatic increase in the amount of 3D content being produced, as well as the more mature level of 3D as a technology.
A feature which Epson officials highlighted during the launch was the ability of the Epson EH-TW8000 to convert 2D movies to 3D.
The Epson EH-TW6000, the more affordable alternative to the higher-end EH-TW8000, meanwhile has the brightest 3D images in its class as it shares the same image engine of the EH-TW8000 with a 480 hertz refresh rate.
Although it lacks the 2D to 3D conversion capability and the advanced Epson image processing technologies like Super Resolution Technology and Frame Interpolation that the EH-TW8000 offers, it has a pair of 10 watt high quality speakers and auto color mode.
Also at the launch event, held at the Dusit Hotel in Makati City, the Japanese tech firm also unveiled the Epson MG-850HD – the world’s first Apple device HD projector — which allows owners of iPhones, iPads or iPods to dock their devices onto the projector for playback of movies, photos or music.
The projector also features built-in 10W speakers, and a brightness of 2800 lumens, a contrast ratio of 3,000:1, and a resolution of up to 1280×800 (WXGA) — along with a microphone port, for those who would like to use the projector for karaoke or business presentations.
2011年11月6日 星期日
Building a terrible killing machine
Hyper-kinetic presenter Tony Robinson and a team of experts travel to Mametz, a famous battlefield in World War I, in search of a secret tunnel and a massive flamethrower lost for almost a century.
The Livens Flame Projector, strictly the Livens Large Gallery Flame Projector, was used on the first day of the Battle of the Somme in 1916 and only once after that in 1917. Nothing of it exists today though Robinson is determined to find remnants of it on the Somme battlefield near Mametz.
With historian Peter Barton and archeologist Tony Pollard, the bustling Robinson is determined to recover what's left and with the help of the British Royal Engineers build a working replica. The Projector took just 25 weeks to produce from the planning stage to actual deployment. It was almost 10m long, over a metre wide and required a crew of seven trained men.
War diaries kept by officers at the time indicate that on June 28, 1916, about 200 British troops from the Royal Engineers gathered in great secrecy near Mametz. They worked underground in secret tunnels out of sight of German lines.
The weapon was powered by air pressure. Once it reached a certain level, the head (monitor) of the weapon was pushed out of the ground. A mixture of kerosene and diesel was ignited and shot towards the German lines.
How effective the weapon was is not known but war historians speculate that where it was used, it was spectacularly effective.
The Livens Flame Projector, strictly the Livens Large Gallery Flame Projector, was used on the first day of the Battle of the Somme in 1916 and only once after that in 1917. Nothing of it exists today though Robinson is determined to find remnants of it on the Somme battlefield near Mametz.
With historian Peter Barton and archeologist Tony Pollard, the bustling Robinson is determined to recover what's left and with the help of the British Royal Engineers build a working replica. The Projector took just 25 weeks to produce from the planning stage to actual deployment. It was almost 10m long, over a metre wide and required a crew of seven trained men.
War diaries kept by officers at the time indicate that on June 28, 1916, about 200 British troops from the Royal Engineers gathered in great secrecy near Mametz. They worked underground in secret tunnels out of sight of German lines.
The weapon was powered by air pressure. Once it reached a certain level, the head (monitor) of the weapon was pushed out of the ground. A mixture of kerosene and diesel was ignited and shot towards the German lines.
How effective the weapon was is not known but war historians speculate that where it was used, it was spectacularly effective.
2011年5月15日 星期日
Canon Launches Latest Series of LV Projectors
SINGAPORE - Canon today announces the launch of five new projector models (LV-7290, LV-7295, LV-7390, LV-7490 and LV-8225) in its ultra-portable LV series. Ranging from entry-level network-ready LV-7290 to the compact and powerful LV-7490 with 4000 lumens brightness, to the widescreen LV-8225 projector featuring native WXGA resolution, the new range contains a model suitable for every projection need.
All the 5 LV LCD multimedia projectors share several common features designed with both academic and business presentations in mind. The new projectors offer XGA resolution (except the LV-8225 which features native WXGA resolution) to provide sharp image detail and bright, clear projection in any location. Loaded with a wide-angle 1.2x zoom projection lens for crystal clear picture quality and a powerful 10W speaker, the new LV projector series promises to take the combined audio and visual experiences of every presentation to the next level.
Designed for greater ease of use, the latest LV projectors come with Auto Set-Up Functions for signal input, PC signal type, and vertical-keystone correction. At a push of a button, the projector automatically identifies the type of input signal (video or computer). For computer input, it automatically synchronises the projector’s display with the computer screen’s pixel configuration. Auto vertical-keystone “squares” images when the projector is facing the screen at an angle, enabling projection in awkward, space constrained areas.
Furthermore, multiple inputs consisting of various computer, video and audio connections ensure the LV projectors stay compatible with a wide range of display sources. Network connectivity is also possible with RJ-45 network and RS-232C serial connections. Other features include the customisable Logo function for users to load their own images like corporate logos for displaying in between presentations. In terms of maintenance and day-to-day usage, the new LV projectors come with an Easy-Install Lamp and Direct Power-On which are extremely convenient for ceiling mount projectors.
Last but not least, the devices have an extended lamp life of up to 6000 hours. Consumers will also appreciate the extended Air Filter life that lasts up to 5,500 hours in ECO Mode. Made of a new three-layer, highly efficient, hybrid material, the filter cleans the air drawn in by the internal fan that cools the projection fan. In terms of power consumption, the projectors consume less than 1W in standby mode. All of the models are also suitable for quiet environments due to their low noise levels, which are just 29dBA when in ‘Eco Mode’.
Customised Configurations for every Presentation
With a wide plethora of common features as highlighted above, the new Canon LV projectors’ series also provide additional capabilities designed for every user’s needs. With the growing popularity of widescreen notebook and desktop computers, the LV-8225 LCD projector is capable of delivering native WXGA-resolution (1280 x 800) for widescreen 16:10 images. Rated at 2600 lumens, this projector is designed for full-screen display of diagrams, spreadsheets and video, elements which are often included in educational presentations. Users conveniently avoid the need for image compression or other picture-distorting measures.
For those who need higher brightness due to bigger space or stronger ambient light, the new Canon LV-7490 LCD Projector provides the answer at 4000 lumens of brightness. With an XGA-resolution of 1024 x 768, this portable model is ideal for educational institutions where students can take notes without the need to darken the entire classroom.
All the 5 LV LCD multimedia projectors share several common features designed with both academic and business presentations in mind. The new projectors offer XGA resolution (except the LV-8225 which features native WXGA resolution) to provide sharp image detail and bright, clear projection in any location. Loaded with a wide-angle 1.2x zoom projection lens for crystal clear picture quality and a powerful 10W speaker, the new LV projector series promises to take the combined audio and visual experiences of every presentation to the next level.
Designed for greater ease of use, the latest LV projectors come with Auto Set-Up Functions for signal input, PC signal type, and vertical-keystone correction. At a push of a button, the projector automatically identifies the type of input signal (video or computer). For computer input, it automatically synchronises the projector’s display with the computer screen’s pixel configuration. Auto vertical-keystone “squares” images when the projector is facing the screen at an angle, enabling projection in awkward, space constrained areas.
Furthermore, multiple inputs consisting of various computer, video and audio connections ensure the LV projectors stay compatible with a wide range of display sources. Network connectivity is also possible with RJ-45 network and RS-232C serial connections. Other features include the customisable Logo function for users to load their own images like corporate logos for displaying in between presentations. In terms of maintenance and day-to-day usage, the new LV projectors come with an Easy-Install Lamp and Direct Power-On which are extremely convenient for ceiling mount projectors.
Last but not least, the devices have an extended lamp life of up to 6000 hours. Consumers will also appreciate the extended Air Filter life that lasts up to 5,500 hours in ECO Mode. Made of a new three-layer, highly efficient, hybrid material, the filter cleans the air drawn in by the internal fan that cools the projection fan. In terms of power consumption, the projectors consume less than 1W in standby mode. All of the models are also suitable for quiet environments due to their low noise levels, which are just 29dBA when in ‘Eco Mode’.
Customised Configurations for every Presentation
With a wide plethora of common features as highlighted above, the new Canon LV projectors’ series also provide additional capabilities designed for every user’s needs. With the growing popularity of widescreen notebook and desktop computers, the LV-8225 LCD projector is capable of delivering native WXGA-resolution (1280 x 800) for widescreen 16:10 images. Rated at 2600 lumens, this projector is designed for full-screen display of diagrams, spreadsheets and video, elements which are often included in educational presentations. Users conveniently avoid the need for image compression or other picture-distorting measures.
For those who need higher brightness due to bigger space or stronger ambient light, the new Canon LV-7490 LCD Projector provides the answer at 4000 lumens of brightness. With an XGA-resolution of 1024 x 768, this portable model is ideal for educational institutions where students can take notes without the need to darken the entire classroom.
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