Hi, have a weird issue in a DM4 motherboard.

It is an INVENTEC ZIDANE2.0 MV Dis 6050A2402401 motherboard that has a short-circuit in +VCCSA pwm circuit.

At first U501 ( TPS51461) gets very hot, so I replaced whit a new one, but the short-circuit was still present.

Before removing U501, I could check that the damaged component was a little capacitor (C531) connected to pin 18 of U501. (+V5A short to gnd)

Replaced C531 and U501 and laptop powers on, but there is no backlight an no image.

Power consumption is a bit low, (1.1 amps) and debug card shows code 7C.

All voltages seems to be good, and ddr3 tested with good module. Also the bios programmed with good data.

Can someone what 7C code means?

Thanks for your help.

Edit: forget to mention that caps lock is blinking all the time.