Most likely, the IP cannot be found due to abnormal operation. Confer with the initial place for troubleshooting.
If there is Untrue welding, it needs to be re-soldered. When there is problems, it really should be measured if the resistance value is normal. Switch the corresponding elements abnormally, and Verify the small board soldered over the PCB; the smaller board is revealed from the figure under.
Solder paste column M705, flux, board washing h2o with complete alcohol; board washing water is utilised to scrub up the solder residue soon after repair; thermal gel (specification: Fujipoly SPG-30B) is used to smear the area of your chip just after repair ; ball-planting metal mesh, solder absorption wire, solder ball (the ball diameter is recommended to be 0.
a) Liquid crystal display Screen ASICNG: if (0), initially measure the total voltage from the measuring domain as well as the Raise circuit 20V is typical, and after that make use of the limited circuit probe to short-circuit the RO examination level as well as 1V8 check issue in between the primary and the 2nd chip, and after that work This system to locate the chip. Test the serial port log, if 0 chip remains observed right now, it will be amongst the subsequent predicaments: a-1) Make use of a multimeter to measure if the voltages at the 1V8 and 0V8 test factors are 1.8V or 0.8V. Otherwise, it signifies that the 1.8V or 0.8V LDO circuit of the domain is abnormal, or the two ASIC chips of the area just isn't soldered effectively; most circumstances of the phenomenon are a result of small circuits of 0.8V, 1.8V patch filter capacitors (evaluate the resistance on the patch filter capacitors connected to the back and front of the PCBA). a-two) Test whether or not the circuits of U2, U3 and U4 are abnormal, such as resistance welding, and so forth. a-three) Measure the resistance of R232 or R233 using a multimeter to examine if it is within just one ohms and the looking at is not going to jump randomly. If not, make sure you replace both of these resistors. a-4) Verify When the pins of the very first chip are soldered properly (it was uncovered through repair which the pins are tinned observing within the facet, nevertheless the pins are certainly not stained with tin whatsoever in the event the chip is taken out). b) If a person chip can be found in stage a), it signifies that the initial chip plus the earlier circuit are great. Use an identical method to examine the following chips. Such as, short-circuit the 1V8 take a look at stage as well as the RO check issue involving the 38th and 39th chips. If the log can discover 38 chips, the initial 38 chips have no challenge; if you continue to obtain 0 chips, Examine the 1V8 very first; if It really is normal, it means that there's a dilemma Together with the chips just after 38. Go on to investigate with dichotomy till the problematic chip is located. Assuming that there is a difficulty While using the Nth chip, once the 1V8 and RO in between the N-1th and Nth chips are small-circuited, N-one chips can be found, but in the event the 1V8 and RO in between the Nth and N+1th chips are small circuited, your complete chip can't be found.
3V, as well as the domain voltage with the again fields are Virtually all larger than 0.38V. This situation is brought on by the chip not staying soldered perfectly, normally 1.8V, 0.8V, RXT, CLK aren't soldered properly. It is suggested to instantly evaluate the domain voltage to Find which area is the situation. The 1V8 and RO brief-circuit technique Utilized in portion a) might also Identify the irregular placement;
● After the schedule check is handed (the shorter-circuit exam of the general schedule test is critical to stay away from the chip or other resources staying burnt as a result of quick circuit when the power is turned on), the chip exam is often executed Using the hashboard tester, along with the positioning is usually determined in accordance with the exam results of the hashboard tester.
; Next, following the Visible inspection is handed, the impedance of each and every voltage domain can be examined initially to detect no matter if There's a limited circuit or an open up circuit. If Certainly, it needs to be dealt with initially. Also, check whether the voltage of each area is about 0.36V.
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2. Make the check SD card In keeping with the requirements, and immediately unzip the compressed package deal of The only-sided heat sink inspection chip for making the SD card;
b) If one particular chip are available in step a), it signifies that the initial chip as well as the former circuit are very good. Use an analogous strategy to check the subsequent chips. One example is, short-circuit the 1V8 exam stage along with the RO take a look at place concerning the 38th and 39th chips. If the log can discover 38 chips, the first 38 chips haven't any challenge; if you continue to discover 0 chips, Examine the 1V8 very first; if It really is typical, this means that there is a difficulty Together with the chips soon after 38.
In case the serial port stops long-length functioning once the brief-circuit, this means the main chip is Alright. In accordance with this process, discover the chip that still fails after a long-distance operating after a chip short circuit. Usually, it really is because of a damaged chip, and you Price Here will switch it;
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