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One of the common problems in Samsung 153v LCD Monitor was display dim. If you get closer to the screen and begin to observe the display under dark environment you actually could see the display but it was very dim. If you press the front panel button, the on screen display (OSD) would appeared and this proof that the main board, driver board and LCD panel is working and the problem is in the inverter board. The function of inverter board is to generate an ac wave from dc voltage to power up the lamps which was located at the top and bottom of the LCD Monitor. If the inverter board has problems it would not light up the lamps and what you could see only a dim display.

I still could recall when I first encountered such problems long time ago and because of lack of information, I could not solve it. I did call up my repair friends to asked about the solution but no one able to give me an answer. Even if you surf the internet for "Samsung 153V LCD Monitor dim display repair", you would not find it. Due to this I have to do my own research to find the answer and I've never give up. Winston Churchill once said "Never, never, never give up". I'm releasing the solution only to my loyal members or subscribers only-thanks for your support.

Let's start now! Once the cover and the internal aluminum casing were opened I saw two bulged filter capacitors at the secondary side of switch mode power supply. The value was 470 and 1000 microfarad 25 volts. I saw four more electrolytic capacitors located at the inverter board have changed color and the value was 47 micro farad 25 volts. Browsing through the whole board with my ESR meter I found another capacitor faulty (220 uf 25 volts) which was near the fuse (3amp). Since this capacitor was located at the same line with the fuse, I presumed that the fuse may give way as well. True enough, checking the fuse with an ohmmeter revealed that it has open circuit.

Now, the real problem faced by many electronic repairers who deals with this model was, after replacing all of the components above the LCD Monitor still would not work-it's still dim! First you have to ask yourself why the fuse blown? Could it be caused by the defective capacitors or something shorted beyond the fuse line? The nearest circuit to the fuse was the start circuit that consisted of a pair of NPN and PNP digital transistor (4k7 +4k7 resistor built into the transistor). Some other LCD monitor designed used the combination of C945 and A733 in start circuit. By the way the part number for Samsung 153V start circuit transistors were the A6J (PNP digital transistor) and the A8J (NPN digital transistor) as shown in the picture.

Sometimes only these transistors have problems (shorted) that caused the fuse to blow but in the above case both digital transistors are tested okay. Since both transistors were working, now the concentration have to be in the four ic's that drive the high voltage transformers because the 12 volts voltage was supplying to each of these ic's. These 4 ic's have many part numbers and the most common one that the manufacturer used was 4532m. Some board used the AD4E10 and BBD3N13 part number. At the moment it is quite hard to get the datasheet or technical specification for this number even from the web search.

Do you know what is inside these IC's? It is actually a pair of P-channel and a N-channel mosfet built into it. And do you know that it can be test with a meter? Yes, if you use the Peak atlas component analyzer, it would prompt to you the result. From the result what you get are N channel FET located at pin 1 (source), pin 2 (gate), pin 7 & 8 (drain and both pins joint together internally). As for P channel FET, pin 3 (source), pin 4 (gate) and pin 5 & 6 (drain and both pins joint internally). From the above test I found two of these ic's have shorted. Replacing these two shorted IC with the capacitors and fuse put the LCD Monitor back to life!

One more thing I would like to share on this model was that the inverter PWM IC BIT1305 was quite robust and rarely gave problem.

Jestine Yong is a electronic repairer and a writer, for more electronic and LCD MONITOR repair information, please visit his website at http://www.electronicrepairguide.com/lcd-monitor-repair.html

China's electronics industry: a call for "Green Manufacturing"

    66th China Electronics Fair has ended in Shanghai. The show's theme is "the perfect exhibit at the electronics industry chain", an exhibition area of up to 6 million square meters, from the electronic materials, electronic components, integrated circuits to the production equipment, measurement and control equipment, to automotive electronics, optoelectronics display, IT accessories and consumer electronics cover the entire electronics manufacturing industry chain. Exhibition attracted 2,500 from around the world e-business, and 60000 professional visitors, the National Electronics Show to become the true sense of the electronics manufacturing industry the largest "platform."

Re-scraping "Asian Treasures"

From South Korea, Japan, Hong Kong and China Taiwan Electronics Industry Association (exhibition) and the China Electronics Fair (CEF) Organizing Committee co-sponsored the Second Shanghai Asia Electronics Show (AEES 2005) is the Electronics Show in creating an important platform for international exchanges stage. "Asia's leading electronic digital future" for the purpose, the Asian Electronics Show full display of the Asian electronics industry as a whole chain of developments. Is located in Hall No. 1 Electronics Show in Asia highlight the home video, home entertainment, home networking, home appliances, portable office equipment, mobile communications equipment, mobile storage and other digital products, and the upstream end of the integrated circuit chip, software and other high-tech products . World-renowned consumer electronics manufacturers such as TCL, Changhong, Shinco, Hitachi, TDK, as well as digital home appliance components well-known manufacturers such as Omron, Avnet, Japan, Murata Manufacturing, STMicroelectronics, Euro Tech, Infineon, Wei World Science and Technology, Altera, Shanghai 100 million light, Molex Dengjun will be ultra-large-scale exhibition debut, showing 3C today's most advanced technologies and products.

According to information provided by the Organizing Committee to participate in the show the number of overseas exhibitors over 300 groups from Japan, Korea, the United States, Singapore, Russia, India and other 24 countries and regions. In which the revitalization of South Korea's electronics industry will be (KEA) organized the 66 South Korean companies participating, bringing from the component to the terminal equipment to the latest consumer electronics, electronic products, adding to the bright to the show. In addition, South Korea Pavilion also brought South Korea's national song and dance performances, to make the Korean Pavilion crowd surging. However, fly in the ointment is that had participated in the first session of the Asia Electronics Show in the South Korean giant Samsung and LG somehow absent.

Value chain interactions

Professional seminars Electronics Show in the nation's repertoire. The 66th Electronics Show in supporting forums and seminars are held in a dozen, including the 2005 Asia Digital Television Forum and Digital TV Industry Chain Construction Summit, China's electronics manufacturing services industry, Summit Forum, 2005 SMT International Tour Forum (Shanghai Station) , 2005 Automotive Forum 2005 (Shanghai) RFID application of high-level seminar, the fifth international electronic test and measurement professional seminars, the second session of the ultra-high-brightness light-emitting diode (LED) and semiconductor lighting industry, Development and Application Forum, 2005 Portable Forum digital technology and products, pollution prevention and control electronics, 2005 will be a hero and so on. These seminars, industry experts and government departments of the people in China today to discuss the subject of greatest concern to the electronics industry, tracking the industry hot spots, in order to promote technology development and market demand closely.

China Electronics Manufacturing Services Industry Forum, to "OEM and EMS: Selection and Management" as its theme, concerns the context of the global electronics manufacturing industry development trends, in particular the internationalization of China's electronic information enterprises in the process of cross-border collaboration and value chain collaboration, including OEM and EMS interaction. Forum, an issue of concern include: how to strengthen the OEM and EMS, ODM's cross-border cooperation, and promote the global electronics manufacturing efficient use of resources, particularly in some of China's large enterprises in the international cooperation, how to use the global EMS, ODM resources; the same time China's EMS how to seek local and international second-class OEM opportunities for cooperation. Experts noted that the contract manufacturing is the basic characteristics of China's electronics manufacturing industry, seminars contract manufacturing, China is not only an important concern of e-business, but also the overall situation of China's electronics manufacturing has strategic significance. China's electronics manufacturing industry is experiencing such a fundamental shift, from China to Created in China. But China's creation must be based in China makes sense, but also includes the creation of industrial mode creation. Challenges, China's electronics enterprises must strengthen their cross-border collaboration and value chain collaboration, innovation model, to enhance the core competitiveness of the value chain to form a strong link.

Call for Green Manufacturing

2005 heroes of pollution prevention and control electronics will be in Shanghai on the standard, RoHS testing, material substitution, recycling, the system response to such a hot topic, "Lun Jian", indicating "Electronic Information Products Pollution Control Management Measures" forthcoming. Experts point out that the EU WEEE & RoHS Directive, as well as the forthcoming Ministry of Information Industry promulgated the "Electronic Information Products Pollution Control Regulations," will undoubtedly bring challenges and opportunities brought about.

Another "green" highlights of RFID (radio frequency identification technology, or electronic labels). 2005 (Shanghai) RFID application of high-level seminar, clearly launched the "local application of contributing to industrial development" theme, the cost for the industry recognized, standards and needs of the three major RFID tag applications, obstacles, work to promote the large-scale suitable for local application, with the industry to explore the application of the successful cases and the value chain so that the parties to a win-win business model, so that RFID applications to achieve ROI (return on investment). Since 2004, the domestic RFID began to heat up, rise from the chips, tags, software, card readers, system integration as well as areas such as large print vendors, as well as logistics, packaging, retail, manufacturing, transportation, public utilities and other applications The extensive public attention. China, as one of the world's manufacturing center is also one of the largest consumer, there is no doubt that RFID technology will become a big country.
About the Author

I am a professional editor from
Chinese Manufacturers
, and my work is to promote a free online trade platform.
http://www.chinaqualitycrafts.com/ contain a great deal of information about

aluminum electrolytic capacitors
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farad capacitors

welcome to visit!

I am getting a capacitor for my system which one would be best?

I have a sony xplod head unit running into my MTX JackHammer JH600 amp powering my MTX JH4512-X2D subs. These setup is in my 2000 GMC jimmy with stock battery/ alternator.

Should i get

http://www.amazon.com/Raptor-C1-0FM-Farad-Capacitor-Digital/dp/B0009DTJBO/ref=sr_1_2?ie=UTF8&s=electronics&qid=1261054684&sr=8-2

or

http://www.amazon.com/Lanzar-LQ16CAP-Contaq-Farad-Capacitor/dp/B001D22P34/ref=sr_1_1?ie=UTF8&s=electronics&qid=1261054714&sr=1-1

I apologize for the other moronic answers to your question. Those people probably actually believe the crap that they wrote. In truth, a CAP is a quick discharge battery that will absolutely improve the bass response in your vehicle. By keeping the input voltage constant, the initial "punch" as well as long rolling bass notes will be improved. I have always recommended 1farad for every 1000 watts. Although this is probably over kill with improved amp efficiency, err on the "too big" side rather than "too small".
Hope this helps. Again, I apologize for the previous answers. Remember, this IS a public forum and you don't have to know the right answer to actually think that you do.

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