Open the Cabinet to observe internal connectivity finished Katin good line, noting that the main control chip ATJ2273B, Flash memory chips for Korea HY50U5616220T-J, digital audio power amplifier chip for XPT8871. First of all, block voltage measurement with multimeter b + and b-two solder joints on the circuit board voltages between 0VW67service manual download site
Then take off the battery and circuit board connector, measurement of battery two line voltage is 0V, description the battery may be damaged and temporarily aside. Set the meter to the ohmmeter, measure resistance between b + and b-only about 2 ω, determine there is leakage on line short circuit.W67service manual download site
W67service manual download site
According to the printed circuit board, the actual mapping circuit shown in Figure 1, picture shows a point of resistance value measured only 2 ω. Road ohmmeter measurement SMD diode D3 forward and reverse resistance to normal, SMD diode D2 measured values of both positive and negative resistance is small, suspected D2 may penetrate. Remove D2 a foot solder, and D2 is intact.W67service manual download site
To check measurements carefully identified SMD capacitor C52 breakdown short-circuiting. Taking ceramic capacitors of a nominal 104 substitution turned out, repeat a point resistance to ground thousands of ohms, indicating normal circuit.W67service manual download site
W67service manual download site
Then consider Repair battery problem. This machine uses a cylinder-shaped Keng batteries, carefully using a razor blade, lithium battery outer plastic wrapping paper, which reveal hidden Keng cells and strip-shaped charge protection circuit board. Battery with multimeter voltage blocking test file two leads to extreme voltage of 3.4V that illustrate the basic good batteries,W67service manual download site
W67service manual download site
Only charging Protection Board is damaged. Removed from waste mobile phone battery to take a charge protection circuit board, corresponding with the RASP of a cylinder battery out, connect wires to restore lines and charge the battery for half an hour, power on the test that everything works.W67service manual download site

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