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7. When powering to the hash board, the detrimental copper wire of the power offer has to be connected to start with. Just before screening the sample, the repaired hash board needs to be cooled down ahead of tests, normally it'll bring about examination PNG.
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3. Make the SD card As outlined by the requirements. When the hash board is simply set up with just one-sided warmth sink and detect the chip, immediately decompress the compressed package deal to make the SD card;
; secondly, following the Visible inspection is passed, the impedance of every voltage domain can be tested initial to detect regardless of whether There exists a brief circuit or an open up circuit. If located, it must be handled very first. Moreover, Test whether or not the voltage of every domain is about 0.36V.
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; secondly, following the visual inspection is handed, the impedance of each voltage domain is usually tested first to detect no matter whether There's a limited circuit or an open circuit. If Certainly, it has to be dealt with 1st. On top of that, Test if the voltage of every domain is about 0.36V.
Most likely, the IP can not be located because of abnormal operation. Check with the primary place for troubleshooting.
If you don't abide by this order, it is rather straightforward to cause damage to U1 and U2 (not all chips can be found); Right before screening the sample, the repaired hash board should be cooled down ahead of testing, usually it'll cause screening PNG.
two. The maintenance operators needs to have sure electronic understanding, more than one 12 months of upkeep experience, and be proficient in BGA/QFN/LGA package soldering technological know-how. 3. Following repairing, the hash board must be examined for greater than two situations being OK in advance of it may go! 4. Test whether the instruments and hash board testers can operate Ordinarily, determine the maintenance station to check computer software parameters, exam fixture variations, etc. 5. During the test of repairing and replacing the chip, the chip needs to be tested very first, and afterwards the purpose exam shall be executed after passing. The perform take a look at will have to ensure that the small heat sink is welded experienced. When putting in the big heat sink, the surface from the chip should be evenly coated with thermal gel along with the cooling lover shall be at full speed. When utilizing the chassis to dissipate warmth, 2 hash boards really should be placed at the same time to variety an air duct. The only-sided examination from the creation also needs to be certain that the air duct is formed (critical). 6. When measuring the signal, use 4 fans as help for heat dissipation, along with the supporters shall manage comprehensive velocity. 7. When powering to the hash board, consumer need to initially link the unfavorable copper wire of the facility offer, then the positive copper wire of the ability offer, And at last plug within the signal cable. When eradicating, the buy of set up must be reversed. 1st get rid of the sign cable, then remove the optimistic copper wire of the ability source, And eventually remove the damaging copper wire of the facility source. In the event the user usually do not abide by this purchase, it's very very easy to lead to damage to R233, R232 (not all chips can be found). Before tests the sample, the repaired hash board needs to be cooled down just before screening, or else it may trigger PNG. eight. To replace a fresh chip, printing pins and soldering paste are essential making sure that the chip is pre-soldered then soldered on the PCBA for repair III. hash board Tester Producing and Matters Needing Notice The supporting fixture on the hash board tester must fulfill the warmth dissipation of your hash board and facilitate the measurement of alerts. 1. When using the 19 Professional check fixture for The 1st time, you should use FPGA (produce conversion file) to update the examination fixture to decompress the fpga file, duplicate every one of the data files for the SD card, then insert it into your take a look at fixture card slot, power on for approximately 1 minute, and look ahead to the instruction light-weight flashes over three instances to complete the update, then clear away the SD card. Note: Should the Purchase Here update is not accomplished, it could induce the check fixture to prompt the identical chip mistake every time. two: Make sure you specifically decompress the conversion file and replica it to your SD card. (Make sure you format the SD card just before copying)
In the course of screening, it can be assumed the domain voltages of all domains before the abnormal spot are Pretty much all less than 0.3V, even though the domain voltages of the next domains are Virtually all larger than 0.
The method for repairing The problem is as follows: in the course of the PT2 test, intently check the serial port print log. Once the serial port continues to be running for an prolonged stretch of time, use a brief-circuit probe to small-circuit RO and 1.
I had been let down Together with the efficiency of the hash board. It was slower than other available choices I'd experimented with, and failed to provide a similar amount of hashing ability.
● Following the routine check is passed (the short-circuit test of the general regimen exam is essential to steer clear of the chip or other products remaining burnt due to the short circuit when the power is turned on), the chip check can be executed While using the hash board tester, as well as positioning is usually determined according to the test results of the hash board tester. ● According to the shown final results from the hash board tester detection, ranging from in the vicinity of faulty chip, Verify the chip take a look at points (CO/NRST/RO/XIN/BI) and voltages for instance VDD0V8 and VDD1V8. ● According to the sign stream, apart from the RX signal, reversely transmit the sign (from No. seventy six to No. 1 chip), quite a few on the indicators such as CLK CO BO RST are ahead transmission (one-seventy six), along with the irregular fault stage can be found from the electrical power offer sequence.