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| "Miguel Giménez" <me@privacy.net>: Aug 12 01:04PM +0200 >> Miguel Giménez > Your original fault is most like the AS15 IC. There are several variants and some of them are all plastic while some have a metal belly pan for ground and heatsink. If yours has the belly pan, you must use hot air to get it out. What I do is put chipquik on the IC, if it floats off the board, replace with a plastic version. If it won't budge, break out the hot air to flow the solder under the chip. Replace with a metal back version. > As to why the other IC failed, are you sure it shorted? If the AS chip shorts, it will put the power converter IC into shutdown. Try removing the AS15 and see if the power IC outputs properly with no load. Thank you both for your answers. I have a SMT air station for chip removal, and the IC has a bottom pad for heat sinking. I will desolder it when the replacement arrive. Soldering the bottom pad will be difficult, though. The BD8160 has the inner boost FET shorted (pins 4 and 5 are shorted to ground), so the 12 V input is shorted to ground through the boost coil. There is a 1206 fuse, but it is OK. The AS15 is after the boost diode and a series MOSFET switch, so I know the short is not in it (I have the T-CON schematic). If the board comes back to life I will check the AS15, it is easy to test because it is just an array of analog buffers. -- Saludos Miguel Giménez |
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