| Electronics > Repair |
| Fairy Lights & Battery Acid on the Electronics |
| (1/1) |
| jonovid:
battery operated fairy lights for a childs bedroom. hanging from the ceiling once forgotten about. the 4 AA cell 6 volt battery pack leaked acid over the pcb see-image. I made a repair using a 5 volt AC plug pack power supply from an old modem. replacing everything except the fairy lights and adding a longer cable. what I would like to know is the original intended purpose of the microcontroller in a simple 2 wire circuit. other than just a timer. as any flickering of a single circuit cluster light would not be that pleasant. as most Christmas lights use 2 or 3 strings in parallel circuits to get a pleasant twinkling effect. |
| Swake:
As you mentioned, this thing is just a timer to save some battery capacity. Eventually it can be a dimmer that reduces intensity over time to make it a 'kids sleep lamp'. After a good clean this might still work. It is a very simple schematic. Rinse it with water and a eventually a mild detergent. You might want to use a mild brush like a toothbrush. Dry it well before powering up. Make sure there is no moisture under the chip. Measure all the traces to check them. J3Y is probably a S8050 transistor. See pic borrowed from the internet |
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