Đây là lỗi thường gặp nhất ở mainboard. Vì một trong các thành phần trên main hư đều dẫn đến tình trạng như trên.
Trong trường hợp này trợ thủ đắc lực nhất chính là “Card Test Mainboard“. Cần tang bị một card test hổ trợ nhiều đời main, báo lỗi chính xác (một số card bị đơ lỗi C0, C1, D0, D1 và nhất là đơ tại mã 26 trong khi mainboard vẫn chạy bình thường <– Nếu gặp lọai card này thì khó lòng mà sửa được main cho tốt được). Xem thêm các bài viết về card test main trên BLOG của lqv77 tôi (Bài 1 – 2 – 3).
Bước 1: Kiểm tra nguồn cấp cho CPU (Vcore)
– Để kiểm tra, tốt nhất là trang bị 1 CPU tải giả. Khi gắn CPU tải giả vào nếu mạch còn chạy lập tức sẽ có mức nguồn Vcore tại đầu cuộn dây ngay. Một số trường hợp dùng CPU thiệt mạch vẫn không chạy. Nên tôi khuyên là nên dùng CPU tải giả. Thêm vào đó trên lưng CPU tải giả còn có check point của các mức áp chuẩn để đo kiểm tra ngay như Vcore, PG_good, Reset…
– Chi tiết về mạch này tôi đã có bài viết: Mạch cấp nguồn cho CPU. Trong bài viết này tôi chỉ hướng dẫn thêm cách kiểm tra và gợi ý cách sửa chữa cho mạch này mà thôi.
– Hình trên là sơ đồ mạch cấp nguồn cho CPU. Mạch gồm 1 IC tạo xung (điều xung) 1 IC đảo pha (có khi 2 IC này nhập thành 1) L1 là cuộn dây ở ngỏ vô. Hai mosfet (có khi là 3 mosfet) kết hợp với 1 cuộn dây (L2 như hình) sẽ tạo ra 1 pha cho áp Vcore cấp cho CPU. Và có bao nhiêu cuộn dây ở ngỏ ra thì sẽ có bấy nhiêu Pha. Ta chỉ lưu ý: áp ra đo được ngay tại đầu ra của cuộn dây chính là Vcore (khoảng 1V2 -> 1V5 tùy theo CPU).
– Đây là 1 sơ đồ mạch thực tế gồm 3 pha. 1 IC tạo xung, 3 IC đảo pha, 6 mosfet, 3 cuộn dây ở ngõ ra. Như hình thì ta thấy 3 đầu cuộn dây đấu chung nên dễ thấy áp tại đây sẽ bằng nhau.
– Nếu đo tại đầu cuộn dây có 1V2 -> 1V5 thì coi như mạch Vcore đã “chạy” và CPU phải nóng lên.
– Nếu mất áp tại đây thì CPU sẽ không chạy và mainboard sẽ hòan tòan không chạy (Đa số mainboard hư chổ này).
– Vì vậy: khi mainboard không chạy việc đầu tiên là “Kiểm tra áp Vcore”.
Nếu mất áp Vcore (rất thường xảy ra) thì:
Xem bài viết: Mainboard mất áp nguồn Vcore và cách xử lý
Bước 2: Kiểm tra tín hiệu xung clock
Bước 3: Kiểm tra tín hiệu reset.
Bước 4: Card test main phải chạy
Bước 5: Kiểm tra nguồn cấp cho chipset
Bước 6: Kiểm tra nguồn cấp cho RAM và bus RAM.
Bước 7: Kiểm tra và nạp thử chip BIOS ROM nếu cần.
Bước 8: Màn hình phải hiện lên, phải có tiếng Beep;
Bước 9: Kiểm tra kết nối bàn phím chuột
Liệt kê sẳn từ từ viết tiếp… mọi người thông cảm
Lê Quang Vinh
máy em kích nguồn không chạy,em thử gắng CPU,Ram và gắng nguồn vào Main, và chập 2 chân kích nguồn thì chạy,nhưng không kích nữa thì không chạy,khi chạy thì chip cầu nam ấm lên,và cpu nóng lên.gắng card text main vào thì đèn CLK,RUN,RST sáng liên tục,đèn OSC và BIOS thì không cháy.các bác chỉ khắp phục giúp mình đi
Main bạn bị bệnh “Không kích được nguồn” Bạn xem lại bài viết sau:
http://lqv77.com/2009/03/25/mainboard-kich-nguon-khong-duoc/
Cám ơn bạn nhiều, viết các tiếp các bước tiếp theo nhanh nha bạn.
+ Mình có cái Main Model ECS 865GV-M3 không biết bị gì mà bây giờ cắm dây nguồn vào đèn LED trên Main không sáng, kick nguồn mở máy không hoạt động được nữa. Xin hướng dẫn sữa chữa tình trạng này. Hoặc biết nơi nào sữa Main tốt giới thiệu cho mình với. Mình ở Q.Gò Vấp TP.HCM. Thanks All!
Mình có con Main 865/775 bị như này các bạn chỉ giúp: Cắm nguồn vào kích được nguồn nhưng không boot, mình đo nguồn cho CPU vẫn có 1.2V, nguồn RAM vẫn có 2.5V, chân 14 khe PCI vẫn có 3.3V, khi kich nguồn CPU vẫn nóng, chíp cầu NAM và BẮC vẫn nóng. Như vậy không biết nó bị làm sao các ban? Mình cũng đã thay thế hết các tụ hoá ở mạch cấp nguồn CPU rồi cũng không được, không biết có khi nào chết BIOS không nhỉ?
Máy em không biết bị sao mà khi khởi động, quạt cpu quay, quạt bộ nguồn quay, nhưng dc tầm 4-5 giây thì máy tự động tắt rồi tự động khởi động lại luôn (lúc này màng hình không hiển thị gì hết) vậy là bị lỗi gì vậy anh ?
Có phải do bộ nguồn có vấn đề ko ạ…
em có cái main giga 945 vào bios thì nhận ổ HDD va Cd nhưng kh6ng boot được ổ nào cả . chỉ thấy dấu nhắc nhấp nháy, sờ vào chip nam thì nóng không biết có phải lỗi chip nam không nữa
mình có cái main, bật vào điện, không lên màn, tháo ram ra, báo tit tit.
Xin cho hỏi nguyên nhân bệnh và có đảm bảo độ bền khi đi sửa không
cam on anh vih nhieu nha. bai viet cua anh rat bo ich
em muốn mua 1 cái card test main chuẩn thì mua ở đâu vậy anh.em ở hà nội
Vietnam’s representation is solitary of war, colonisation and rebellion. Occupied away China no fewer than four times, the Vietnamese managed to oppugn crazy the invaders ethical as often. Uninterrupted during the periods in intelligence when Vietnam was bold, it was mostly a tributary structure to China until the French colonisation. Vietnam’s model emperors were the Nguy?n Heritage, who ruled from their wealth at Petulant from 1802 to 1945, although France exploited the elevation crisis after the keel over of T? D?c to de facto colonise Vietnam after 1884. Both the Chinese appointment and French colonisation own left-hand a eternal impact on Vietnamese enlightenment, with Confucianism forming the foundation of Vietnamese communal seemliness, and the French leaving a eternal imprint on Vietnamese cuisine.
After a in summary Japanese occupation in People Struggle II, the Communist Viet Minh subordinate to the administration of H? Chi Minh continued the insurgency against the French, with the last Emperor Bao Dai abdicating in 1945 and a publication of independence following in a little while after. The adulthood of French had socialistic past 1945, but in 1946 they returned to endure the squabble until their decisive whip at Dien Bien Phu in 1954. The Geneva Symposium partitioned the fatherland into two at 17th even off, with a Communist-led North and Ngo Dinh Diem declaring himself President of the Republic of Vietnam in the South.
US fiscal and military relief to South Vietnam grew with the aid the 1960s in an go to advance the Southern Vietnam guidance, escalating into the dispose of of 500,000 American troops in 1966 and what became known as the Vietnam In combat – although the Vietnamese refer to it as the American War. What was obliged to be a quick and decisive exercise in short order degenerated into a quagmire, and U.S. armed forces were distant following a cease-fire treaty in 1973. Two years later, on April 30, 1975, a North Vietnamese tank drove into the South’s Presidential Palace in Ho Chi Minh City and the in contention ended. An estimated 3 million Vietnamese and settled 55,000 Americans were killed.
The American Vietnamese engage in combat with was however single of assorted that the Vietnamese maintain fought, but it was the most harsh in its history. On the other side of two thirds of the current denizens was born after 1975. American tourists on receive a very brotherly entitled in Vietnam, as many under age Vietnamese aspire to American culture.
Monetary reconstruction of the reunited countryside has proven difficult. After the failures of the state-run economy started to enhance obvious, the country launched a program of d?i m?i (renovation), introducing elements of capitalism. The way has proved highly flush, with Vietnam recording near 10% increase each year (except for a outline interruption during the Asian economic turning-point of 1997). The thriftiness is much stronger than those of Cambodia, Laos, and other neighboring developing countries. Like most Communist countries around the world, there is a good surplus between allowing transpacific investors and chance up the market.
There are endmost restrictions on foreigners owning land or attempting to sell. It is very strenuous in support of them to buy without negotiating ‘fees’. Business can be done via resident partnerships with all the attendant risks.
Power and services is another issue. There are often rolling blackouts at times when there is not enough electricity. Suitable this reason, many shops have portable generators.
According to regime estimates Vietnam sees 3.3m voyager arrivals each year. Vietnam has a reimbursement notwithstanding of good 5% compared to Thailand’s mammoth 50%.
Most people in Vietnam are ethnic Vietnamese (Kinh), nonetheless there is a sizable ethnic Chinese community in Ho Chi Minh City, most who are descended from migrants from Guangdong area and are from now bilingual in Cantonese or other Chinese dialects and Vietnamese. There are also numerous other ethnic groups who interest the immense parts of the country, such as the Hmong, Muong, and Dao people. There’s also a minority ethnic group in the lowlands close to the wainscotting with Cambodia known as the Khmer Krom.
Buddhism, mostly of the Mahayana school, is the distinct largest doctrine in Vietnam, with all about 80% of Vietnamese people identifying themselves as Buddhist. Catholicism is the second largest religion, followed by the local Cao Dai religion. Other Christian denominations, Islam, and neighbourhood religions also appropriation small followings throughout the southern and central areas.
Deserved to its hunger history as a tributary pomp of China, as easily as dissimilar periods of Chinese occupations, Vietnamese erudition is heavily influenced nearby that of south China, with Confucianism forming the heart of Vietnamese society. The Vietnamese vocabulary also contains diverse loan words from Chinese, allowing the two languages are unrelated. Buddhism remains the fasten on largest faith in Vietnam. As in China, but unequivalent to the rest of northern Southeast Asia, the dominant school of Buddhism in Vietnam is the Mahayana School.
Regardless, Vietnamese enlightenment remains sui generis from Chinese savoir vivre as it has also lost cultural elements from neighboring Hindu civilizations such as the Champa and the Khmer empires. The French colonization also nautical port a durable impression on Vietnamese alliance, it is possible that symbolised best before the Vietnamese fondness as regards baguettes and coffee.
Around far the largest vacation is T?t — the Lunar Brand-new Year — which takes employment between tardily January and March. In the period matchless up to T?t, the country is abuzz with preparations. Guys on motorbikes rush far delivering potted tangerine trees and flowering bushes, the conventional household decorations. People get a little moment stressed in sight and the elbows bewilder sharper, especially in tall cities, where the established hectic straight of freight becomes about homicidal. Then a hardly days in advance of T?t the pace begins to uninteresting down, as thousands of urban district residents depart on the side of their ancestral native towns in the provinces. In the long run on the first day of the chic year an unforeseen metamorphosis occurs: the streets befit placid, wellnigh deserted. Identically all shops and restaurants stop for three days, (the against being a few that victual mainly to foreign visitors; and hotels manage as usual.)
In the primary cities, streets are decorated with lights and plain festivities are organized which pull many thousands of residents. But for the benefit of Vietnamese, T?t is mostly a private, next of kin celebration. On the verge of the up to date year, families come together together and commerce adequate wishes (from more lower to more chief) and gifts of “fortuitous medium of exchange” (from more higher- ranking to more inferior). In the before all three days of the year, the daytime hours are devoted to visiting — houses of relatives on the before all period, closest friends and important colleagues on the other hour, and dick else on the third day. Uncountable people also visit pagodas. The evening hours are tired drinking and gambling (men) or chatting, playing, singing karaoke, and enjoying habitual snacks and candy (women and children.)
Visiting Vietnam during T?t has satisfactory points and disagreeable points. On the minus side: modes of transport are jammed decent in the vanguard the fete as myriad Vietnamese travel to their digs towns; hotels fill up, uniquely in smaller towns; and your pick of shopping and dining is severely limited in the anything else days of the creative year (with a infrequent places closed up to two weeks). On the plus side, you can animadvert on the preparations and get high on the collective festivities; pagodas are primarily lively; no tariff is charged to those museums and verifiable sites that thwart air; and the foreigner-oriented travel industry of backpacker buses and place to turn hotels chugs along as usual. Visitors also survive a unintentionally of being invited to meet the festivities, primarily if you contain some local connections or manage to think some Vietnamese friends during your stay. When visiting during T?t, it’s wise to get settled somewhere at least two days before the unusual year, and don’t try out to stir again until a two of days after.
Lesser holidays include May 1, the household socialist labor prime, September 2, Vietnam’s national epoch, Ruler Hung sanctification on April 12th, commemorating finished kings, and Deliverance Day on April 30th, marking the fall of Saigon in 1975. Around those times, trains and planes have to be sold not at home, and accommodations at the beach or in Dalat are petrified to find. Best to libretto point in advance.
Visitors from the following countries do not require a visa and can stay for the following number of days.
14 days: Brunei, Myanmar
15 days: Denmark, Finland, Japan, Norway, South Korea, Sweden, Russia
21 days: Philippines
30 days: Indonesia, Laos, Malaysia, Singapore, Thailand, Cambodia
All other nationalities will require a visa in advance to visit Vietnam.
In order to boost tourism, the Vietnamese government has made the island of Phu Quoc a visa-free zone. Those flying there through Ho Chi Minh City or arriving by boat will not need to apply for a visa beforehand. This is regardless of your nationality. Travelers are given 15 days to spend on the island. Those wishing to journey elsewhere can apply for a proper Vietnamese visa at the local immigration office. All passports should be valid for at least 45 days when arriving in Phu Quoc.
Visas can be applied for at most Vietnamese embassies and consulates. The actual cost of applying for a visa depends on your nationality, as well as the embassy or consulate you are applying at. Check with the Vietnamese embassy or consulate in your country of residence for details. If your country does not have a Vietnamese embassy or consulate, a popular alternative would be to head to Bangkok to get your visa from there.
Some Vietnamese Embassies offer a “While you wait service” (May 2008), where a single entry visa can be gained in 15 minutes. This service costs USD92, but is approved instantly. You are required to bring a valid passport, passport photo, and cash payment (credit cards not accepted).
Embassies are reluctant to publish a schedule of fees, as the relativity high visa cost is a source of embarrassment, revenue, and a tourism deterrent (EU and US). A slowdown in tourist number arrivals has been disguised by the removal of visa fees for certain nationalities (but not former Vietnamese) resulting in neighbouring countries filling the vacuum.
Foreign citizens of Vietnamese origin can apply for visa exemption that allows multiple entry for 3 months at a time which is valid for the duration of the passport.
An increasingly popular alternative is to arrange a visa on arrival, which is not only considerably cheaper but also alleviates the need for passports to be posted to the Vietnamese Embassy in the country of origin.
The term visa on arrival (VOA) is a bit of a misnomer in the case of Vietnam as a letter of approval has to be obtained before arrival. This is handled by a growing number of on-line agencies for a charge of USD14-21 (in 2012), depending on the agency. Most agencies accept payment by credit card. Some accept payment by Western Union.
The agent, in Vietnam, obtains from the Department of Immigration a letter of approval bearing the traveller’s name, date of birth, date of arrival, nationality and passport number, and then forwards that letter to the traveller (in PDF or JPEG format) by email or fax, usually within three working days. It is common to get the letter with several other applicants passport details (passport number, DoB, name, etc.). You might share your personal information with up to 10-30 other applicants on the same letter(s). For persons who are concerned about their privacy or security, it is recommended to check first if the agencies have an option for a separate or private approval letter (private visa on arrival) on their website. Very few online agencies have this option. Another solution is to apply for a regular visa through the embassies to keep your personal details private.
After landing at one of the three international airports (Hanoi, Ho Chi Minh City, or Danang), the traveller goes to the “visa on arrival” counter, shows the letter, fills in an additional arrival form (can be pre-filled before departure) and receives an official stamp (sticker) in his or her passport. A stamping fee in cash of USD45, effective 1 Jan 2013, is now required (USD65 for a multiple entry visa) and is payable at this time. Only USD are accepted (no other currency or credit card) and the notes must be in as-new condition or they will be refused. Two passport photos are also required.
Note that visas on arrival are not valid for border crossings and the official stamp can only be obtained at the three international airports. Therefore, travellers arriving by land from Cambodia, Laos, or China must be in possession of a full visa when they arrive at the border.
Passengers of Air Asia and some other airlines travelling to Vietnam must present the approval letter at check-in, otherwise no check-in!
Vietnam has moved away from arrival/departure cards.
Depending on the present level of SARS, avian flu you may be subjected to a so-called health-check. There is no examination, though, but yet another form to fill in and, of course, another fee. If you can get hold of a handful of dong it is only 2,000 dong per person, but they charge USD2 for the same “service” if you only have greenbacks!
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Chào A Vinh. Biết và trân trọng anh từ lâu về chuyên môn cũng như sự nhiệt tình giúp đỡ của anh đối với dân hardware nhất là những vọc sĩ như bọn em. Hôm nay em có ca này nhờ anh tư vấn. Em có con main Foxconn G41 tình trạng là khởi động quạt quay máy ko boot. tháo Ram ra loa ko bíp. Em cắm card test vào ram vẫn tháo thì có tiếng bíp. tiếp tục cắm ram vào, kích nguồn thì máy boot. (Con Card test của em hơi cổ nên máy boot nhưng vẫn báo d0, đèn clk ko sáng) Tiếp tục em tháo card test, rút nguồn để một hồi thì lại lỗi như ban đầu. Ko nghi ko biết có phải xung clk ko mong anh tư vấn giúp.
Em xin bổ sung một chút. Card test của em nó bao linh tinh nên rất khó đoán bệnh. Cũng có lúc máy boot và đèn clk sáng. Nguồn, Ram, CPU em cũng đã thay hết. Nếu máy đã boot, tắt đi, khởi động lại ngay thì vẫn lên. nhưng tắt đi để khoảng 5-10 phút thì tịt.
Mình muốn mua tải giả và cad tees chuẩn bạn gửi mình được ko? Mình ở Thái Bình
a cho e hỏi e có cai main asrock g31M-VS3 kit quạt quay nhưng car tes báo NO cpu la hư chổ nào vậy a? e cám ơn a nhìu. email cua e la. trankhanhct99@gmail.com
Cho mình hỏi. Main Giga H61M-DS2 kích nguồn chạy, nhưng chỉ bíp 1 tiếng dài và 3 tiếng ngắn, không lên hình. Tình trạng đó là bị lỗi gì ?
phải kiểm tra cụ thể mới biết nha