Verify The situation on the temperature sensor. The temperature sensor is all Positioned within the back of the PCB, whilst the resistance is situated on the front from the PCB.
Repair strategy: Check out the looks, measure the chip capacitor or resistance in entrance, commonly It is brought on by lousy chip soldering or even a chip capacitor, resistor damaging or abnormal resistance;
Verify the welding high quality of the warmth-delicate chip and also the tiny heat sink. The deformation of the big heat sink substance will cause poor warmth dissipation of your chip and affect the temperature big difference. Figure 5-14 4. Phenomenon: Solitary board detection chip isn't comprehensive (PT1/PT2 stations) a) Liquid crystal display display ASICNG: if (0), first measure the overall voltage of your measuring area and the Strengthen circuit 19V is usual, and then utilize the short-circuit probe to shorter-circuit the RO examination level as well as 1V8 take a look at level among the initial and the next chip, and then function This system to find the chip. Checking out the serial port log, if 0 chip is still observed at this time, It's going to be among the next predicaments: a-1) Utilize a multimeter to evaluate whether the voltages at the 1V8 and 0V8 take a look at details are one.8V or 0.8V. If not, it suggests which the one.8V or 0.8V LDO circuit of this domain is abnormal, or the two ASIC chips of this area is not soldered effectively; most of this are due to small circuits of 0.8V, one.8V patch filter capacitors (measure the resistance on the patch filter capacitors associated with the front and back with the PCBA). a-2) Verify if the circuits of U1 and U2 are abnormal, like resistance welding, and so on.
6. The repaired hash board must be examined which has a check fixture, and it have to go over two periods to get judged as a very good products. For The 1st time, immediately after changing the components, look forward to the hash board to chill down, make use of the take a look at fixture to test, and when is passed, put it on one particular side in advance of cooling down. The 2nd time, watch for the hash board to cool down completely in advance of screening.
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● Once the regime check is handed (the limited-circuit test of the final schedule check is critical to avoid the chip or other products becoming burnt as a result of shorter circuit when the facility is turned on), the chip examination could be carried out Using the hashboard tester, as well as positioning might be determined according to the exam result of the hashboard tester.
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2. Following the plan inspection is Alright (short circuit detection of basic program inspection is important, so as to not burn up the chip or other resources as a result of limited circuit when the power is turned on), the chip could be tested With all the examination fixture, as well as the judgment and positioning might be carried out in accordance with the test result of the check fixture;
c-1) Predicament 1: The take a look at time is largely similar to that of an OK board (typically the value of X does not transform every time it can be examined). (The exam time refers back to the time from urgent the start examination button to your Liquid crystal display displaying The end result ASIC NG: X).
two. The upkeep operators have to have selected Digital expertise, multiple yr of servicing working experience, and become proficient in BGA/QFN/LGA deal soldering technologies. three. Just after repairing, the hash board has to be examined for over two instances to get Okay ahead of it may pass! 4. Check whether or not the equipment and hash board testers can perform Usually, determine the upkeep station to check application parameters, check fixture variations, and so on. 5. Within the exam of repairing and replacing the chip, the chip should be tested to start with, then the operate examination shall be executed following passing. The functionality examination need to ensure that the small warmth sink is welded certified. When installing the large warmth sink, the surface on the chip needs to be evenly coated with thermal gel and the cooling enthusiast shall be at total speed. When utilizing the chassis to dissipate warmth, two hash boards should be put simultaneously to kind an air duct. The single-sided check of the production also needs to ensure that the air duct is shaped (vital). 6. When measuring the sign, use 4 fans as help for warmth dissipation, plus the admirers shall manage comprehensive pace. 7. When powering within the hash board, person have to first hook up the adverse copper wire of the facility provide, then the optimistic copper wire of the facility provide, And eventually plug in the signal cable. When eradicating, the get of set up have to be reversed. Initial clear away the sign cable, then remove the optimistic copper wire of the ability provide, And eventually get rid of the destructive copper wire of the ability supply. If the user tend not to follow this order, it is rather straightforward to result in damage to R233, R232 (not all chips can be found). Right before testing the pattern, the repaired hash board should be cooled down in advance of tests, or else it may trigger PNG. 8. To exchange a whole new chip, printing pins and soldering paste are essential to make certain that the chip is pre-soldered and afterwards soldered into the PCBA for repair III. hash board Tester Building and Issues Needing Awareness The supporting fixture with the hash board tester need to satisfy the heat dissipation of the hash board and aid the measurement of signals. one. When utilizing the 19 Pro take a look at fixture for The 1st time, you might want to use FPGA (produce conversion file) to update the examination fixture to decompress the fpga file, copy all the data files on the SD card, then insert it into the test fixture card slot, power on for around one minute, and wait for the instruction gentle flashes more than 3 periods to complete the update, then take out the SD Go Here card. Be aware: In case the update is not really accomplished, it may well cause the examination fixture to prompt the identical chip mistake every time. 2: Be sure to immediately decompress the conversion file and duplicate it towards the SD card. (You should structure the SD card right before copying)
● The repaired hashboard could be judged as a very good solution with much more than two passes when screening Using the hashboard tester. For The very first time, immediately after changing the elements, look forward to the computing board to chill down, utilize the hashboard tester to test, and once the test is passed, established it apart and then great it down. For the second time, right after a few minutes when the hashboard cools down, test again.
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Measure regardless of whether There's output on the 2nd pin of U6 as well as voltage is about 3.3V; if Certainly, you should carry on to troubleshoot the condition; if there is absolutely no three.3V, please Look at the connection standing of your hashboard tester cable along with the hashboard is Alright, and reprogram the PIC.
Based on this process, find the chip that still has the long-time period operating failure soon after a particular chip is short-circuited. Generally, it is caused by a specific chip harmful, so just switch it; Determine 5-twenty 7. Phenomenon: PT1 chip exam is Okay, PT2 function check usually experiences a particular chip NG;