④ Detect if the pins of the initial chip are not soldered correctly (you will find tins within the pins within the facet in the repair procedure, but immediately after eradicating the chip, it truly is observed that the pins usually are not stained with tin);
Repair strategy: Check out the looks, measure the chip capacitor or resistance in front, usually It can be because of weak chip soldering or possibly a chip capacitor, resistor harmful or abnormal resistance;
Specifically evaluate the area voltage to locate the problematic area, or use the 1V8 and RO short-circuit strategy to Track down the irregular situation.
Measure whether the domain voltage is ordinary. Commonly, the area voltage is going to be irregular during the problematic area. Then measure the RI signal to find out if the RI signal is damaged. In the event the RI signal is missing, basically, the chip is short-circuited or destroyed just after being tinned.
In case the chip’s look is just not ruined, the chip with the bottom response charge in Each and every area must get replaced.
B) Test if the 4 temperature sensors of U5，R216、R219、R220，U7，R221~R223，U8，R224~R226，U9，R229~R231 as well as matching resistance welding are abnormal, The placement from the temperature sense is as demonstrated in Determine 4-4 and five-13, the temperature sensor is all Positioned within the again on the PCB, the resistance is situated on the back and front on the PCB, and whether or not the temperature sensor 3.3V electrical power offer is typical;
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② Detect whether or not the circuits of U1 and U2 are irregular, including resistor in weak soldering, and so forth.;
If you do not adhere to this order, it is very very easy to lead to damage to U1 and U2 (not all chips can be found); Ahead of tests the sample, the repaired hash board has to be cooled down prior to screening, usually it'll end in tests PNG.
In line with this technique, find the chip that still has Buy Here the long-time period running failure following a particular chip is brief-circuited. Typically, it can be due to a specific chip damaging, so just change it;
During screening, it is actually assumed that the domain voltages of all domains in front of the irregular place are Nearly all below 0.3V, though the area voltages of the subsequent domains are Pretty much all greater than 0.
The tactic for repairing The problem is as follows: through the PT2 test, intently watch the serial port print log. Once the serial port has been working for an prolonged timeframe, use a short-circuit probe to shorter-circuit RO and 1.
(one) Utilize the APW12 electrical power offer (APW1212V-15V and electric power adapter cable) to make a examination System: Use thick copper wires for that positive and unfavorable poles of the ability supply, and then connect the PSU and also the hash board.
PS: In the event the hash board just isn't driven or driven off in accordance with the exam sequence, creating U2 and U10 to melt away out, it will eventually report 0 when tests the chip;