Samsung TA12 mobile phone battery charger with switching power supply, has small volume, light weight, wide ac voltage (100 v ~ 240 v ac voltage all can work normally), fever is the most rarely etc. But its circuit design is too simple (no flow short circuit protection), often burn out due to load short circuit switching power supply, fault phenomenon for the charger light is not bright, without charging voltage output. CiKservice manual download site
 CiKservice manual download site
Measurement circuit, as shown in the appended drawings. Check found: 10 q, 3 q resistance burn out, D3, D4 (1 n4148) n4007 (1), D2 (DW9.1 V), D5 (FU107) diode breakdown, all MJE13001 triode burst (estimated load charging loop) caused by working current increase caused by short-circuits, replacing components, to replace MJE13001 with MJE13003 (power). 10 Ω resistance power also want to take a few bigger, after completion of the element change to match the battery and charger is good, don't insert the battery, connect the ac power, if the work is normal, the battery will shine the lights, then dark (measure the charge on the battery holder contact there should be a voltage output). In the battery, can think working properly when the indicator lamp light. CiKservice manual download site
 CiKservice manual download site
The author for the improvement of the circuit, the circuit output end namely FU107 rectifier output end concatenated Ω a 4 ~ 7 Ω / 1 w resistor. Both can play a protective role, and for the charging circuit. Also D4 diodes had better use FR series high frequency rectifier to substitution, D3, too.CiKservice manual download site