Solder paste column M705, flux, board washing drinking water with complete Liquor; board washing h2o is utilised to wash up the solder residue right after repair; thermal gel (specification: Fujipoly SPG-30B) is used to smear the floor with the chip after repair ；ball-planting steel mesh, solder absorption wire, solder ball (the ball diameter is suggested being 0.
If the test chip is not absolutely detected, the board must be repaired. Whether it is normal once the examination, take out the hash board independently, use the check fixture to hold it in to the Debug master program to mine, and modify the enthusiast pace to ninety five%.
1. Use the 19 series hashboard tester SD card swiping software for the first time to update the hashboard tester control board FPGA, unzip it and copy it to the SD card, and afterwards insert the card to the hashboard tester card slot; ability on for about one moment and await the Manage board indicator to double flash 3 times, then the update is concluded; (if It's not at all updated, it might cause a certain chip to be terrible during the take a look at)
three. Make the SD card In keeping with the necessities. When the hash board is simply put in with just one-sided warmth sink and detect the chip, straight decompress the compressed bundle to produce the SD card;
PatternNG is caused by the large distinction between the features of the chip as well as other chips. At the moment, it is observed the chip die is damaged, so just replace the chip. In accordance with the log information and facts, the substitute guidelines are as follows: If the looks with the chip will not be damaged, just switch the chip with the bottom reaction fee in Just about every domain. The following determine shows one of the test logs, it may be viewed within the log that the reaction fee of 4 chips asic[36][37][43][75] is low.
Or The 2 ASIC chips On this area will not be soldered appropriately. Many of them are attributable to quick circuit of 0.8V and 1.2V patch filter capacitors (measure the resistance in the patch filter capacitors linked to the back and front sides on the PCBA).
three. Just after repairing, the hashboard should be tested for greater than two situations to be Alright right before it could pass!
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If you do not abide by this purchase, it is rather straightforward to result in harm to U1 and U2 (not all chips are available); Prior to screening the sample, the repaired hash board should be cooled down just before screening, or else it will cause tests PNG.
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Through tests, it can be assumed which the area voltages of all domains before the irregular place are Just about all fewer than 0.3V, whilst the area voltages of the subsequent domains are Pretty much all higher than 0.
three. The examination SD card will likely be made In keeping with the requirements, and the double-sided heat sink 8-periods Patter check really should make an SD card, as shown from the determine under;
d-2) The next circumstance; the take a look at time is almost twice as long as the good board (at times the worth of X will modify when you test, and at times X=0); at the moment, the log typically has the subsequent info (the crimson quantity is just not 13, based upon which seat the hashboard tester is linked to); throughout the check, presume that the area voltage of all the fields in front of the irregular situation is almost lower than 0.
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