I purchased an Orion HP-4800 4 channel amp a few months ago. I've been running it just fine until the other day.
I have it in a '98 Audi A4 with an Orion HCCA D-2400 mono pushing an Orion NT2 15" DVC.
For the 4 channel amp, I had been running 2 Orion HCCA 6.5 components in the front and 2 Orion coaxial speakers in the rear baffle. Each speaker is 4 ohms and ran off each of the 4 channels. Everything was working just fantastic. I was very pleased with the setup.
The HP-4800 manual says that the amp can power 65 W RMS x 4 @ 4 ohms or 100 W RMS x 4 @ 2 ohms. Since there 2 more rear door speakers, I decided to run some more coaxial speakers in the rear doors. I put the same ones as I did in the rear baffle. I put the rear door 4 ohm coaxials in parallel to one channel, the 2 rear baffle 4 ohm coaxials in parallel to another channel, and the 2 front door 4 ohm component speakers to the other two channels.
Within 5 minutes of doing so, the protect light turned on and the ESP indicator and orion emblem light started blinking rapidly and there was NO SOUND coming from any of the speakers. I looked in the manual and it state that the ESP blinking means that the amplifier protect was turned on because of overcurrent. I tried unplug the speakers and the amp completely. That did nothing. The amp protect is still on and no sound is coming out.
It sounds to me like I fried the amp. However, the amp is suppose to be 2 ohms stable, isn't it? So technically wouldn't I be able to run the 2 rear baffles in parallel and the 2 rear doors in parallel?
Here is the link to the manual... https://www.orioncaraudio.com/Support/Manuals/Amplifiers/HP%20Series%20(2006)/Orion%20HP-4800%20Owners%20Manual%2047545.pdf
Chances are you have shorted output transistors in the amplifier. I am not familiar with that amp, if you could take some pictures of the circuit board, I can possibly help you in getting it repaired.
So I opened the amp up and knew immediately that I had fried it!
Notice the two large black carbon burned marks...
Here are the other pictures... I lt looks like i burned four or five transistors.
I'm going to talk to the local Orion dealer about fixing it and the cost.
Can I get some help on how to fix it without having to send it out to Orion?
The transistors that explded are the power supply transistors. There are 4 on each side of the board. The 2 on each side that did not explode are probably shorted too. Even if they are OK, you really need to change them too. They all went through the same event, if they happened to survive, there is a good chance they have been weakened. There is a very good chance that shorted outputs caused the catastrophe. You need to check them, the transistors at the other end of the amp, with the large green resistors very near. If you check them and determine they are shorted, i need to know the number on the face of them. Also on one of the power supply transistors that did not explode, are they IRF-Z44 or 46 or 48. I can not make out the last digit on the one you posted. I can see at least one of the gate resistors on the power supply FETs needs to be replaced. There is a good chance they all need replacing. Also get some acetone and a tooth brush and get the soot off of the board. Take another pic of the 4 surface mount transistors, 4 northeast of the east transformer. And 4 nnorthwest of the west transformer. They may look OK but still need to be replaced. If you do not know how to check the transistors with a meter, let me know and I can help you with that too.
If you decide to remove any transistors from the board, DO NOT REMOVE THE SOLDER WITH A SOLDER SUCKER OR DESOLDERING BRAID. It is easier to put more solder on each leg of the transistor and lay your soldering irom across all 3 connections and heat it up till all solder is melted, now using a pair of pliers (not for extra leverage to pull parts from board, but just to keep from burning your fingers) gently rock the part out of the board, and then use the braid or solder sucker.