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Very poor chip soldering or harm to the chip capacitor or resistor, or abnormal resistance commonly brings about The problem.
Check out the welding quality of the warmth-sensitive chip plus the modest heat sink. The deformation of the massive warmth sink material will bring about poor warmth dissipation in the chip and have an impact on the temperature big difference. Figure 5-fourteen 4. Phenomenon: One board detection chip isn't complete (PT1/PT2 stations) a) LCD display ASICNG: if (0), very first measure the entire voltage from the measuring domain plus the boost circuit 19V is standard, then use the brief-circuit probe to small-circuit the RO examination position and the 1V8 exam position among the first and the second chip, and then function the program to discover the chip. Looking at the serial port log, if 0 chip remains to be identified presently, Will probably be one of the following situations: a-one) Use a multimeter to evaluate whether or not the voltages on the 1V8 and 0V8 take a look at points are 1.8V or 0.8V. If not, it suggests which the 1.8V or 0.8V LDO circuit of this domain is irregular, or The 2 ASIC chips of the domain is not really soldered well; most of the are caused by shorter circuits of 0.8V, one.8V patch filter capacitors (measure the resistance of your patch filter capacitors related to the back and front from the PCBA). a-two) Verify whether or not the circuits of U1 and U2 are irregular, like resistance welding, etc.
As outlined by this technique, locate the chip that still has the long-tem working failure after a certain chip is brief circuited. Commonly, it is attributable to a certain chip damaging, so just switch it; Determine 5-19 seven. Phenomenon: PT1 chip take a look at is Okay, PT2 function test normally reviews a particular chip NG.
With the Liquid crystal display Show ASIC75, brief-circuit the 1V8 exam stage as well as the RO exam position amongst the 38th and 39th chips. If brief-circuiting 47 chips, even so the log reviews forty six, it implies which the 47th chip can't be detected, and also the 47th chip has to be replaced.
Sample NG is because of the massive difference between the properties on the chip and other chips. At the moment, it is identified which the chip die is broken, so just substitute the chip. According to the log information, the substitution regulations Look Here are as follows:
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two. After there isn't any issues in regime testing (shorter circuit detection in program testing is normally important to keep away from burning the chip or other resources because of limited circuit when electricity is on), the check fixture can be used to detect the chip, as well as the positioning can be determined dependant on the exam fixture detection outcomes.
Continue on to analyze with dichotomy right until the problematic chip is located. Assuming that there's a trouble Along with the Nth chip, when the 1V8 and RO among the N-1th and Nth chips are brief-circuited, N-1 chips can be found, but when the 1V8 and RO involving the Nth and N+1th chips are short circuited, your entire chip can not be identified.
(2) Significantly less chains: it implies that one of the three hash boards is missing. In this instance, nearly all of the problems are caused by the relationship between the hash board and also the Command board. Verify no matter whether You can find an open circuit while in the cable.
① For starters, visually inspect the hash board to see when there is any deformation or burning from the PCB. When there is any phenomenon, it needs to be addressed first.
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When setting up the large warmth sink, the floor with the chip should be evenly coated with thermal gel as well as cooling fan shall be at entire pace. When utilizing the chassis to dissipate warmth, two hashboards needs to be positioned simultaneously to sort an air duct.
Sad to say, we didn't add aid for this ASIC nevertheless. Should you own this design and need us to add guidance for it, make sure you contact our crew on Discord.