Solder paste column M705, flux, board washing drinking water with complete Alcoholic beverages; board washing drinking water is employed to scrub up the solder residue just after repair; thermal gel (specification: Fujipoly SPG-30B) is used to smear the floor with the chip after repair ；ball-planting metal mesh, solder absorption wire, solder ball (the ball diameter is suggested to be 0.
d-1) The first case: the check time is basically the same as The nice board (usually the value of X will never transform every time you test) (examination time refers to the time from when the beginning examination button is pressed to the result of ASICNG: (X) shown within the LCD). This situation is likely for being attributable to the abnormal resistance welding on the entrance and rear CLK, CI, and BO of the Xth chip, so people shall focus on these 6 resistors. The smaller chance is because of X-1, X, X+one, that is definitely, Among the many three chips, the next pins abnormal welding conditions with the chip manifest: Determine 5-16 d-2) The second case: the examination time is nearly two times as long as The nice board (occasionally the value of X will change each and every time you examination, and occasionally X=0); at the moment, the log ordinarily has the subsequent information (the crimson variety is not thirteen, depending on which seat the hash board tester is connected to); in the check, believe which the domain voltage of many of the fields before the irregular posture is nearly a lot less than 0.
(two) If the chip however stories an integer range soon after confirming the modest board, 1st Examine whether the RX sign is usual, and in addition measure whether or not the chip factors one.
three. The take a look at SD card is going to be created In keeping with the necessities, as well as the PT1 chip detection chip and PT2 functionality examination will probably be right decompressed to generate the SD card.
8V and one.2V patch filter capacitors are quick-circuited, or maybe the IC in the LDO circuit With this area has weak soldering/Untrue soldering/content problems;
B) Verify whether the 4 temperature sensors of U5，R216、R219、R220，U7，R221~R223，U8，R224~R226，U9，R229~R231 along with the matching resistance welding are abnormal, The placement with the temperature sense is as shown in Determine 4-four and 5-thirteen, the temperature sensor is all Situated to the back of the PCB, the resistance is situated on the back and front in the PCB, and if the temperature sensor three.3V electricity offer is typical;
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(two) Next, if there is absolutely no challenge after visual inspection, it is possible to initially exam the impedance of each and every voltage area to detect whether or not There exists a limited circuit or open up circuit. If observed, it need to be handled 1st.
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In summary, to repair The problem, 1 should really 1st inspect the chip’s overall look after which evaluate the capacitor or resistance before it. The issue is typically due to weak chip soldering or harm to the chip capacitor or resistor, which ends up in irregular resistance.
Check out whether or Get It Here not the conductive copper bar is in weak Get in touch with, check whether or not the energy Management wire is free or harmed, and switch the ability provide.
● After the schedule check is passed (the brief-circuit check of the final routine test is essential to steer clear of the chip or other products remaining burnt due to the limited circuit when the ability is turned on), the chip check may be performed While using the hash board tester, as well as positioning can be determined in accordance with the take a look at result of the hash board tester. ● In accordance with the displayed results of your hash board tester detection, ranging from in close proximity to faulty chip, Look at the chip examination details (CO/NRST/RO/XIN/BI) and voltages for example VDD0V8 and VDD1V8. ● According to the sign circulation, aside from the RX signal, reversely transmit the signal (from No. seventy six to No. one chip), numerous of the alerts which includes CLK CO BO RST are ahead transmission (one-76), as well as irregular fault point can be found from the energy offer sequence.