Fan7311 lcd backlight inverter drive ic december 2007 fan7311 rev. Our portfolio of over 100 backlight led drivers enhances the user experience across many display sizes in personal electronics, industrial, and automotive applications. The best is to test the backlight with lcd backlight tester and remove the transformer and compare with each others using ohm and ring tester. In your case, have you checked if there dc supply to the inverter ic. The backlight repair is actually easier than you think, and once you replace the ccfl lamp in your lcd you have essentially restored your lcd display to new condition, as bright and vibrant as it was the first day you got it. The stld41 is a boost converter that operates from 3. An7314 lcd backlight inverter drive ic fan7314 lcd backlight inverter drive ic. I have a matsui lm20n2 lcd tv that has a problem with the power inverter board. The prices are representative and do not reflect final pricing.
The process will be the same for any brand of lcd display. Make offer cmo backlight inverter 27d002544 vit70002. There are two terminals on the right side of the nerdkits lcd panel. Tm 10 freescale, the freescale logo, altivec, c5, codetest, codewarrior, coldfire, c. Vizio tv backlight inverters for sale in stock ebay. Often neglected, this part is extremely important as it contributes to the overall performance of your panel. There are also on and off which not only turn onoff the backlight but also turn onoff the display as well. However no joy for the other inverter, maybe its broken. Fan7314 lcd backli ght inverter drive ic october 2007 fan7314 rev. In order to ensure the optical performance and the reliability, it is necessary to drive your panel backlight with an inverter especially made to match its electrical. July 2005 pesc record ieee annual power electronics specialists. Backlight led drivers products microchip technology inc.
Until i have my mosfet tester build, i deferred troubleshooting the power supply. Led backlight driver ic princeton technology corporation. We used a 12v dc wall transformer, cutting off the. Led backlight driver ics control the voltage and current for white leds used to illuminate lcd panels. This paper presents a novel ccfl inverter driver technology for large size. Cog type lcd driver ic for lcm dot matrix lcd driver ic for lcm lcd clock ic.
If you remove the backlight or one of the transformer the tv will shutdown and you cant perform the actual test. Figure 7 retains the drive scheme and solves the remaining problems. Single dcac ccfl inverter for large size lcd tv with burst control. Most lcd backlight drivers run off a 12vdc input, although applications may range from 5 to 48 v dc.
I dont really want to wait 2 weeks to order some new parts and have a need to get it running this weekend. Complete lcd backlight inverter compared to dime for size. Features highefficiency singlestage power conversion nn halfbridge topology reduces required external components. Tps61195 1features pwm and smbus brightness interface 4. Simple lcd ccflbacklight resonant inverter researchgate. Introduction to led backlight driving techniques for. The schematic for the backlight inverter is indeed included in the service manual. Wled driver for lcd backlighting with pwm and smbus. The lcd tv power provides a 12v output for the signalprocess board, a 24v output for the backlight driving circuit and an additional 5v standbypower output. The max16809 is an integrated, highefficiency white or rgb led driver. The circuit is somewhat similar to a portion of a single back light of my tv.
He scrapped his lcd light table in order use the inverter. Vizio 050004071240 power supply backlight inverter. The tps61195 ic has builtinlinear regulator for the ic supply. An lcd driver also referred to as an lcd display driver or lcd controller is an integrated circuit that provides an interface between a microprocessor mpu or microcontroller mcu system and a liquid crystal display lcd. Typical applications include portable appliances such as smartphones, tablets, cameras, notebook pcs as well as displays such as computer monitor and tv. The driving system adopts only one backlight inverter to drive multi cold cathode fluorescent lamps ccfl.
This circuit draws too much current to run off the 9v battery for very long. The inverter section is located on the bottom left of the display board section, just below and to the right of ribbon cable connector w8 from tenkey pcb. These ub series are a direct replacement for industrial lcd screens that were originally equipped with one, dual or 4 ccfl backlight lamps 15or smaller lcd screen. This kind of problem usually caused by one of the bad backlight led in the led bar. Once the cover was opened i could see three circuit boards i. Stld41 white led driver for midsize lcd display backlight. I have an old 17 lcd that works for about 2 seconds then turns off. The ic and discrete combination offers the ultimate cost vs performance solution for led backlight applications. In order to improve the efficiency and performance of the total system both for the acdc power supply and inverter, stmicroelectronics has introduced a highvoltage ballast driver ic l6574 that provides the halfbridge solution for ccfl backlighting. The ic is marked as follows 2215 6m1 60st it is an 8 pin soic, no mfg label on it. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
The basic driver is a dctoac inverter powered by 5 to 48 v dc. Ccflwarehouse ccfl backlight lamps for lcd back light. I need help identifying an ic for the backlight inverters in the sharp lc15sh7u. Testing lcd backlights is commonplace for many techs and repair shops.
Nerdkits lcd backlight electroluminescent inverter. P5ct072 cvbs to usb converter ic uda80 portable tv lcd schematics varta 9v. Max16809 integrated 16channel led driver with switchmode. Dcdc led backlight drivers products dialog semiconductor. This one had a broken backlight that he wanted to fix. I tracked part of the problem down to a couple of dead flyback driver transistors on one of the backlight inverters. Make offer vizio 365500720111 led driver for m55e0. Texas instruments liquid crystal display lcd drivers enable greater energy efficiency and flexibility in lighting designs. After the backlight replacement, the image should look brighter and clearer. The inverter is the dcac backlight power supply for ccfl panels.
Discussion in guides, tips and tricks started by phazed, jun 8, 2012. Contact your local microchip sales representative or distributor for volume and or discount pricing. Our dcdc led backlight drivers also use dialogs proprietary digital control techniques, including broadled technology to enable the use of loosely binned, lowcost led arrays, as well as a digital control engine that generates the pwm wave form and manages all fault conditions, eliminating the need for expensive microcontrollers. Fan7316 lcd backlight inverter drive ic typical application circuit lcd backlight inverter application device input voltage range number of lamps 19inch lcd monitor fan7316 14. Color sequential led backlight power system with ripplefree circuits for large scale lcd panels. Troubleshooting lcd monitor led backlight circuit page 1. With the industry moving to led backlighting technologies instead of ccfl cold cathode flourescent bulbs you may want a way to test the led backlights before declaring a need for a replacement screen. It is unfortunate that currently it isnt documented on the wiki and the examples on the wiki. Lg 32 tv lcd power supply datasheet, cross reference. A study on the dual power management ic for amoled display. Universal lcd hintergrundbeleuchtung inverter board 124 lampe. Fan7311 lcd backlight inverter drive ic datasheet catalog.
Simple digital lcd backlight inverter using a singlechip microcontroller. A new current balancing methods of ccfl for lcd tv backlight. The lcd screen lcd failure can occur from drop damage, water damage, or it can simply be the result of a defective part. Moreover the circuit introduces a multilamp driving transformer to reduce. Tps61195 wled driver for lcd backlighting with pwm and smbus control interface check for samples. This device has a builtin high efficiency boost regulator with integrated 2. The backlight filter when a short in the backlight circuit occurs, the thin wire inside the filter breaks, severing power from the backlight leds. Fan7319 lcd backlight inverter drive ic absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. Conference record of the 2000 ieee industry applications conference. As shown in figure 3, the backlight driving circuit consists of three power converters. June 1998 pesc record ieee annual power electronics specialists conference. Backlight leds are connected in series and parallel in the rgb led backlight modules. I read around on the net about circuit that controls the ccfl lights, they seem to take lots of precaution and consideration into those circuits.
They extend battery life, reduce board space requirements and enhance the lcd screen performance through heightened dimming methods. It is designed for lcd backlighting and other led lighting applications with multiple strings of leds. Fan73 lcd backlight inverter drive ic september 2006 fan73 rev. Troubleshooting lcd monitor led backlight circuit read 18792 times 0 members and 1 guest are viewing this topic. I have been trying to repair this tv on and off since sep 2008, but i dont have a grate deal of free time, so its just been put in the cupboard collecting dust. Fan7311 lcd backlight inverter drive ic september 2006 fan7311 rev. Fan7314 lcd backlight inverter drive ic datasheet catalog. Backlight inverter driver ic id electronics forums. The eight current sink regulators provide high precision current regulation and matching.
Fsc lcd backlight inverter ic solution lighting product line power conversion. With just one bad led, the tv will shut down thus no picture can be seen. They can be mounted directly on the top and bottom of an lcd screen with or without the existing old metal reflector. Universal led backlight inverter driver board full.
How do i power a lcd backlight inverter got from a. An81 ultracompact lcd backlight inverters analog devices. A customer of mine sent to me this bg led tv with the complaint of have sound but no picture. Vizio vx32l 32 tv lcd backlight inverter slave inverter klsee32cim sl 66.
Attempt to look up backlight boost driver ic datasheet, but cannot find it anywhere. The max16809s currentmode pwm controller regulates the necessary voltage t. The tps61195 ic provides highly integrated solutions for largesize lcd backlighting. How to repair your lcd backlight universiteit twente.
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