A Simple Key For s19 hash board repair Unveiled
A Simple Key For s19 hash board repair Unveiled
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Oscilloscope. The encouraged model is UTD2102CEX+. A community cable is required for an Connection to the internet plus a stable community.
Open MPLABIPE and select gadget: PIC16F1704, simply click electricity to pick out the ability offer method, then click work. The initial step: pick out file to discover the .HEX file to become programmed; The next stage: click on connect to join Generally; The 3rd phase: click on the program button, and just after completion, simply click verifiy to prompt the verification to verify the programming is productive. Determine 5-seven Determine 5-8 Forth step: Check out the boost circuit output
c) LCD Exhibit ASIC113: (Reporting 113), it means that the hash board can detect 114 chips at 115200 baud level, but only 113 chips are located at 12M baud charge, and one chip could not be discovered at 12M baud price; Repair system: Using the dichotomy system, limited-circuit the 1V8 test position and the RO check stage concerning the 38th and 39th chips Along with the small circuit probe. When the log can find 38 chips, there's no dilemma with the 1st 38 chips; if small-circuiting the 47th chip, nevertheless the log experiences forty sixth, it suggests which the 47th chip can not be detected, and there's no trouble Using the Visible inspection. Normally, the 47th chip shall get replaced; Figure 5-15 d) Liquid crystal display Exhibit ASICNG: (X, a particular chip is fixedly described), There are 2 situations: d-1) The very first situation: the test time is basically the same as The nice board (ordinarily the value of X will not likely change each time you take a look at) (check time refers back to the time from when the beginning check button is pressed to time when the results of ASICNG: (X) is shown around the Liquid crystal display). This case is probably going for being caused by the irregular resistance welding from the front and rear CLK, CI, and BO from the Xth chip, so people shall focus on these six resistors. The tiny probability is because of X-one, X, X+1, that is certainly, Amongst the three chips, the next pins irregular welding conditions on the chip occur: Determine 5-sixteen d-two) The second situation: the test time is nearly two times as long as The nice board (occasionally the worth of X will alter every time you exam, and sometimes X=0); right now, the log usually has the following data (the crimson amount is not 13 sometime, determined by which seat the hash board tester is connected to); in the exam, think that the area voltage of every one of the fields in front of the irregular situation is almost lower than 0.3V, as well as domain voltage of the back fields are Practically all increased than 0.34V. This example is because of the chip not staying soldered well, commonly one.8V, 0.8V, RXT, CLK usually are not soldered very well. It is usually recommended to immediately measure the area voltage to Find which area is the situation. The 1V8 and RO brief-circuit technique Utilized in part a) may also locate the abnormal situation;
Evaluate regardless of whether There may be output on the next pin of U3 and also the voltage is about three.3V; if Indeed, make sure you continue to troubleshoot the trouble; if there isn't a 3.3V, remember to check the connection position in the hash board tester cable as well as the hash board is Alright, and reprogram the PIC.
③ Make use of a multimeter to measure the resistor of R8 or R9 to determine whether it is in just 10 ohms, and the studying will not likely bounce randomly. Otherwise, exchange the two resistors;
③ After the Visible inspection is Alright, the impedance of each voltage area might be detected to detect no matter whether You will find a shorter circuit or an open circuit. If identified, it needs to be addressed initially.
Verify the welding good quality from the chip which connects sensor as well as little warmth sink. The deformation of enormous warmth sink content will trigger very poor heat dissipation of the chip and impact the temperature difference.
② Detect if the circuits of U1 and U2 are abnormal, for instance resistor in bad soldering, and many others.;
Upkeep personnel needs to have Digital awareness, at least one particular 12 months of upkeep expertise, and proficiency in BGA/QFN/LGA packaging and welding technologies.
Repair technique one: Measure if the domain voltage with the reset reduced chip domain is lessen than the conventional domain, if it is decreased, measure if the pin resistance of your reset minimal chip is higher than that of the normal chip.
d-1) The 1st scenario: the check time is basically similar to The nice board (ordinarily the value of X won't modify each time you test) (exam time refers back to the time from when the beginning check button is pressed to the results of ASICNG: (X) displayed to the Liquid crystal display).
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Repair process: Verify the looks, measure the chip capacitor or resistor in Go Here front, it is frequently caused by poor soldering of your chip or a damaged chip capacitor or resistor or irregular resistance value;
Make reference to the voltage value range described from the sign development. If the measurement encounters a sizable deviation of the voltage benefit, it can be when compared Along with the measured price of the adjacent group to determine.