two. When the EEPROM NG is exhibited about the Liquid crystal display display on the hashboard tester, Test whether or not the welding of U5 is typical;
Repair process: Examine the appearance, evaluate the chip capacitor or resistance in front, generally It really is attributable to very poor chip soldering or a chip capacitor, resistor detrimental or irregular resistance;
In advance of screening the pattern, the repaired hashboard ought to interesting down prior to tests; normally, it is going to bring on testing NG.
Maintenance system: Check the appearance and measure the capacitance or resistance in the entrance chip. Normally, it is brought on by poor chip welding or damage and irregular resistance of a particular chip capacitor or resistor, or problems with the chip by itself;
8V and 1.2V patch filter capacitors are brief-circuited, or even the IC from the LDO circuit During this area has weak soldering/Bogus soldering/materials hurt;
● Once the regime check is handed (the short-circuit examination of the general routine test is critical to avoid the chip or other supplies currently being burnt due to short circuit when the facility is turned on), the chip test may be executed With all the hashboard tester, as well as the positioning can be determined based on the take a look at result of the hashboard tester.
three. Should the PICsensorNG is displayed within the LCD screen from the hashboard tester along with the exam read temperature is irregular, then Keep to the techniques under to troubleshoot:
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(2) Utilize the check fixture with the V2.1010 Regulate board (its model is ZJ0001000001), the beneficial and negative poles of the power offer of your exam fixture must be put in which has a discharge resistor, and it Get It Here is recommended to make use of a cement resistor of 25 ohms and above 100W.
Based on this technique, find the chip that still has the long-time period operating failure after a certain chip is brief-circuited. Usually, it's brought on by a particular chip harming, so just substitute it;
In case the shorter-circuit continues to be present, you may unplug the CPU and evaluate all over again. Other voltage abnormalities generally swap the corresponding voltage converter IC.
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In summary, this repair technique entails examining Each individual chip in sequence by limited-circuiting them and monitoring the serial port Procedure until finally the defective chip is recognized and replaced.
PS: In case the hash board is not really run or driven off in accordance with the exam sequence, resulting in U2 and U10 to melt away out, it can report 0 when tests the chip;