truclacicr
Badcaps Veteran
Last Activity: Today, 08:13 PM
Joined: 04-21-2019
Location: brisbane
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Find out which pin corresponds to the faulty segment and compare the voltage against good segments. -
Check that the missing segments are being properly driven:
https://szvinka.com/uploadfile/Datas...8B_V1.3-EN.pdf
Also clean up the solder splash from the traces.Leave a comment:
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JW7115SA-2SOTA#TRPBF, JoulWatt, Single Power Switch with Flag
https://comsystem-tlt.ru/files/DS/JW7115S-JoulWatt.pdf...Leave a comment:
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This vendor is selling it, but has no idea what they are selling:
https://www.aliexpress.com/item/1005009473291418.html...Leave a comment:
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I'm betting that it's a Silergy part, in which case the part ID would be EHExyz.Leave a comment:
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https://www.anpec.com.tw/product-download/0/APL3552-1/
https://datasheet.lcsc.com/lcsc/2202...R_C2931342.pdfLast edited by truclacicr; 10-14-2025, 01:05 PM.Leave a comment:
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Assume that the resistance of the NTC is 0. Then 24V appears at A. Now the total current is (24V - 0.6V)/ 220 ohms + 24V / 150 ohms = 266mA.
Look at it another way. Let's split 1.2A between the two resistors. Then the power dissipation in the 150 resistor is 0.6A x 0.6A x 150 ohms = 54 watts....Last edited by truclacicr; 10-10-2025, 08:08 PM.Leave a comment:
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Point A connects to ground via 150 ohm and 220 ohm resistors. At 3V, and allowing for a Vbe drop of 0.6V, the total current exiting that node is only about 30mA. Where do you get 1.2A? At 0.5V you should get about 3mA.Leave a comment:
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Maybe the supply doesn't handle big load changes very well. Can you see what happens if you switch on an additional 1A or 2A load while the system is idling? For example, a bank of dummy load resistors of sufficient wattage might provoke the fault. Alternatively, the element in a 2200W 240V electric jug has a resistance of 26 ohms. That would draw about 0.8A from 20V.Last edited by truclacicr; 10-02-2025, 01:32 AM.Leave a comment:
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