Hi forum friends,
Greetings! This Lanyu airpad model 910 was bought in 2016 and working good till i put in storage around late 2019. Today i took it out and switched on but there is no power led on. I plugged it to the 5v ac adapter for charging but there is also no charging indicator. I checked the ac adapter with my dmm, it shows 5vdc. I thought it must be the internal battery. After opening the case, the 3.7v internal battery measured zero. So i charged it but after 10 minutes, the battery was too hot as i can feel it is melting. I cut off this internal battery and connect to my other 3.7v lithium ion battery pack and start charging. But in less than few minutes, the battery red positive terminal expelled some visible smoke and i immediately shut it off. The external red positive battery terminal almost melted.
Fyi, when i use the dmm to check voltage on the board portion of where the ac adapter connects, i can only detect dc voltage of 0.3vdc as input. (refer image 092422) Is there some kind of component shorted somewhere to cause this? Hope someone with this sort of experience willing to share their views and help.
Thank you in advance.
Greetings! This Lanyu airpad model 910 was bought in 2016 and working good till i put in storage around late 2019. Today i took it out and switched on but there is no power led on. I plugged it to the 5v ac adapter for charging but there is also no charging indicator. I checked the ac adapter with my dmm, it shows 5vdc. I thought it must be the internal battery. After opening the case, the 3.7v internal battery measured zero. So i charged it but after 10 minutes, the battery was too hot as i can feel it is melting. I cut off this internal battery and connect to my other 3.7v lithium ion battery pack and start charging. But in less than few minutes, the battery red positive terminal expelled some visible smoke and i immediately shut it off. The external red positive battery terminal almost melted.
Fyi, when i use the dmm to check voltage on the board portion of where the ac adapter connects, i can only detect dc voltage of 0.3vdc as input. (refer image 092422) Is there some kind of component shorted somewhere to cause this? Hope someone with this sort of experience willing to share their views and help.
Thank you in advance.