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| [title] Circuit board repair | |
| - | [* black] (This step is still being researched. Come back soon!) |
| + | [* black] The circuit board contains the charging and battery protection circuits. At the heart of these is IC1, a 6 pin IC type [https://cdn.sparkfun.com/assets/learn_tutorials/2/5/1/DW01-P_DataSheet_V10.pdf|DWP01-P]. This has 3 functions: halting the charge when the battery voltage reaches 4.25V, preventing over-discharge if the battery voltage falls below 2.4V, and over-current protection. |
| + | [* black] A failure to operate or to charge (assuming the battery is good) may be due to this IC or any of the components around it, becoming faulty. |
| + | [* black] NPN transistors Q1, Q2 and Q3 can be tested with a multimeter on the diode range. First, disconnect the battery. With the positive probe on B and the negative lead on either E or C, it should read around 0.7V. |
| + | [* black] Q4 is a PNP type which can be tested in exactly the same way except with the negative probe on B. Q5 is a N-channel MOSFET and cannot be tested so easily. |