Question on BB2125 2 Channel Amp

it appears that the left channel is defective, repair or replace

Try a reset. Start by unplugging for 1 minute, then plug back in & if still won't restart try the following. If none of the following work, you will need a technician.

Initializing the TV in many cases can remedy a problem.
In the 2006 product line Initialization is now a user function.
Pressing the front panel "INPUT' and "FORMAT"
buttons at the same time activates Initialization. When
complete all user settings will have to be set again. The
table in Figure 4-3 list the User Initialization procedures.
Note: Pressing INPUT and FORMAT is the same as
the Initialization in the Option Menu (MENU-2-4-7-0)
Order Name Procedure Results Notes
1 System Reset Press <System Reset>
on Front Panel
Hardware & TV operating
software reset.
POWER/Timer LED flashes for 60
seconds. No customer settings
are changed.
2 User Initialization
Press <INPUT> &
<FORMAT> on Front
Panel at the same time.
All customer Audio &
Video settings are reset to
factory default.
All customer settings will need to
re-configured.
3 Reset System
Defaults
From the remote, press
<MENU> <1-2-3>
<ENTER>
All customer settings
except V-Chip are reset to
factory default.
Netcommand, Channel Memory,
etc., will need to be re-configured.
SERVICER
PROCEDURE 4 Initialization
From the remote, press
<MENU> <2-4-7-0>*
select "INITIAL" press
<ENTER>
All customer settings are
reset to factory default.
All customer settings will need to
re-configured.
MITSUBISHI RESET / INITIALIZATION CHART
CUSTOMER
PROCEDURES
Figure 4-3
Figure 4-4
LED Indications
The front panel LEDs, refer to Figure 4-4, also assist in
determining the cause of a symptom. Figure 4-5 illustrates
normal LED operation. Figure 4-6 shows the
LEDs response when a problem is detected and indicates
the possible cause.
Power/Timer
Indicator
Status
Indicator
Lamp
Indicator Condition
Off Off Off Off (standby)
Blinking green
fast Off Off Initialization (10 - 65 seconds)
Off Off Blinking
green fast Lamp runs for 1 min after PTV off
Green Off Off Power On
Blinking green Off Off Power On Timer is set
NORMAL LED INDICATIONS
Power LED Status LED Lamp LED Condition
High Temperature - check ventilation air flow.
(Temperature sensor is disconnected.)
Off Off Blinking yellow Lamp cover is open.
Lamp failure (Lamp fails to turn on)
Off Off Red (Lamp turns off after lighting)
Lamp is broken
Off Blinking Red Off Fan Stop
Off Red. Off Circuit failure. (Run Error Code Check)

Your friend has damaged his amp. The power light coming on means that the amp's power indicator LED is at least working. That light is only there to tell you that the amp is receiving power on it's 12 volt rails, not that it's necessarily using the power in any way other than warming up the amp's internal circuitry. When you say the amp gets power, I'm not clear on whether you mean the amp works in that fashion, or there's just a red LED glowing but nothing else happens. The amp needs to be repaired, and I would suggest to him to not apply power to it again until it is checked by a professional. The power supply has probably been damaged, and it's possible, depending on how the amp was mounted, that it was searching for ground through the amp's chassis if it was screwed into metal at its mounting location. All that seems certain as of now is that the LED works, but nothing else, unfortunately.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/reginald_bec291de192ca44f

Error indicates Formatter,Hard disc & main PCA any one of them faulty.. Through light pattern we can estimate which part is faulty...Read carefully, understand the indications..
Led pattern: Power supply LED as 1
Formatter leds 3nos from left to right as 2,3 & 4..

* indicates "on"
# indicates "off"
& indicates "flashing"

* # # # ....Main PCA
* * # # ....Formatter
* $ # # ....Hard disc
* * * $ .....Main PCA or Formatter
Note down which LED are on.off & flashing,compare with above said indications find out the faulty part..

Error indicates Formatter,Hard disc & main PCA any one of them faulty.. Through light pattern we can estimate which part is faulty...Read carefully, understand the indications..
Led pattern: Power supply LED as 1
Formatter leds 3nos from left to right as 2,3 & 4..

* indicates "on"
# indicates "off"
& indicates "flashing"

* # # # ....Main PCA
* * # # ....Formatter
* $ # # ....Hard disc
* * * $ .....Main PCA or Formatter
Note down which LED are on.off & flashing,compare with above said indications find out the faulty part..

http://www.retrevo.com/support/QSC-RMX-4050HD-Amps-manual/id/23107ci658/t/2/

Page 7...

CLIP: red, to the left of each Gain control.

Normal indication: illuminates whenever the amplifier is driven beyond full power. The LED's brightness indicates the amount of distortion. Distortion that causes only brief flashing may not be audible.

During muting, the indicator fully illuminates. This occurs during normal "On-Off" muting.

Abnormal indication:

•Bright red illumination while the amp is being used indicates either thermal muting or a shorted output.

•If the amplifier overheats, the fan will run at full speed, and operation should resume within one minute. Allow the fan to run, and make sure the amplifier ventilation is adequate.

•A shorted or overloaded output circuit will cause excessive Clip flashing and possible overheating.

•If distortion is audible without a Clip indication, the problem is either before or after the amplifier. Check for damaged speakers or overloaded signal source. The amplifier Gain control should be in the upper half of its range to prevent input overload.

Error indicates Formatter,Hard disc & main PCA any one of them faulty.. Through light pattern we can estimate which part is faulty...Read carefully, understand the indications..
Led pattern: Power supply LED as 1
Formatter leds 3nos from left to right as 2,3 & 4..

* indicates "on"
# indicates "off"
& indicates "flashing"

* # # # ....Main PCA
* * # # ....Formatter
* $ # # ....Hard disc
* * * $ .....Main PCA or Formatter
Note down which LED are on.off & flashing,compare with above said indications find out the faulty part..

in *********** board where the reset & power botton is connected same place you can find HDD LED for Harddisk and Power LED for power, please be carefull with the sign designation about (+) and (-) it is indicated in the board and pin.

The red led is the protect indicator.

When this stays red you have either a bad speaker or the amp has a blown channel. Those are the 2 most common problems with the protect light staying red.

Disconnect the speakers and if the amp turns on without speakers, you most likely have a bad speaker. Take them in to a service center and have them checked.

if you disconnect the speakers and it still stays red, you most likely have a bad channel in the amp.

There is nothing you can do with that except to take it in to be serviced.

Both of the possibilities are common problems with all car amplifiers.

Since you checked the wiring, there is really no other end user actions that can help you on this.

Sorry for the bad news, but if this information was of value to you a good rating would be appreciated and appropriate.

Let me know if you require any further help, I have been repairing car and home amplifiers for over 17 years and can help you on most questions

i have a pyle pro 1000 watt max 2 channel mono and 2 channel stereo and when i get that thing loud the little red light cums on basically what i mean is that the amp on channel one is cooked i myself i wouldn't even use it y cause more damage