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Hi everyone, I'm a beginner trying to learn electronics repair. I have an issue with the amplifier board of my Philips 2.1 Home Theater (1 subwoofer + 2 mini speakers) and could really use some guidance.

Background:

A while ago, this system had an issue, and a local technician altered it by replacing the original panel with a car stereo panel. I am not sure what exact modifications or resistor additions were made to the board back then, as I don't have much technical knowledge about it.

The Current Problem:

When I power on the home theater, the front display immediately shows an "HI" (or H1) error, and the system completely locks up. There is no sound output at all.

What I've done so far:

I opened the board initially because the FM wasn't working (later realized I accidentally shorted the FM antenna wire to the ground).

While inspecting the board, I found a completely rusted and burnt-out resistor in the power supply section.

Using a multimeter in continuity/beep mode, I traced the line from the main filter capacitor (C114) to the burnt resistor pad (it showed 001). I soldered a new 1K resistor there (you can see it in the attached photos).

However, upon powering it on, it still shows the exact same "HI" error.

My Question:

I suspect there is a short circuit somewhere else on the board (maybe the main amplifier ICs or diodes?) which is causing this error and causing the resistor to burn. Since I am a beginner in component-level diagnostics:

Could someone guide me on how to easily check for a short circuit (especially if an Amplifier IC is dead) using just a basic multimeter?

I have attached the photos of the board and the display error. Any help would be greatly appreciated. Thank you in advance!

Need help diagnosing a short circuit on my Philips 2.1 Amp Board (Front display shows "HI" and locks up).