Here is a link to the Bose 3-2-1 [https://elektrotanya.com/bose_av321_troubleshooting.pdf/download.html|service manual] which should be of some help as it has the all the tests and circuit diagrams of the unit.
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Here is a link to the Bose 3-2-1 [https://elektrotanya.com/bose_av321_troubleshooting.pdf/download.html|service manual] which should be of some help as it has the all the circuit diagrams of the unit.
To download the file when the sentence below the Document preview box changes from ''This file is downloadable free of charge: ...processing...'' to ''This file is downloadable free of charge: Get Manual'' click on the ''Get Manual'' as this is the download link. Be patient it takes a little while to find the file.
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On p.42 and p.46 it describes how to test the display panel
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On p.42 and p.46 and also p.64 it describes how to test the display panel
If you find this too daunting, I suggest that you contact a reputable, professional electronics repair service (preferably skilled in audio receiver repairs) and ask for a quote to repair the unit.
Try shining a torch at an angle close to the LCD display screen and see if you can detect any display on the screen when the unit is on. It will be very faint so trying it in a darkened room may help. If you can detect an image then you have a backlight problem with the LCD display.
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You need to check whether the backlight power supply is actually appearing at the LCD display terminal or not. If it is then unless it is a faulty connection to the display panel itself, (it may be by flex cable or hard wired I don't know), you have a faulty display module backlight and the LCD display module will need to be replaced.
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There is a microprocessor on the display pcb that controls the backlight function as well as numerous other functions which you say appear to be working OK.
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''Be very careful when trying to test for the voltage'' as you don't want to slip when using the DMM (Digital MultiMeter) and causing more problems than what you had before you started, especially as the power will be connected.
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Here is a link to the Bose 3-2-1 [https://elektrotanya.com/bose_av321_troubleshooting.pdf/download.html|service manual] which should be of some help as it has the all the circuit diagrams of the unit. (On p.46 it also describes how to test the display module)
-
+
Here is a link to the Bose 3-2-1 [https://elektrotanya.com/bose_av321_troubleshooting.pdf/download.html|service manual] which should be of some help as it has the all the circuit diagrams of the unit.
To download the file when the sentence below the Document preview box changes from ''This file is downloadable free of charge: ...processing...'' to ''This file is downloadable free of charge: Get Manual'' click on the ''Get Manual'' as this is the download link. Be patient it takes a little while to find the file.
+
On p.42 and p.46 it describes how to test the display panel
If you find this too daunting, I suggest that you contact a reputable, professional electronics repair service (preferably skilled in audio receiver repairs) and ask for a quote to repair the unit.
Hi @jk5563 ,
Try shining a torch at an angle close to the LCD display screen and see if you can detect any display on the screen when the unit is on. It will be very faint so trying it in a darkened room may help. If you can detect an image then you have a backlight problem with the LCD display.
You need to check whether the backlight power supply is actually appearing at the LCD display terminal or not. If it is then unless it is a faulty connection to the display panel itself, (it may be by flex cable or hard wired I don't know), you have a faulty display module backlight and the LCD display module will need to be replaced.
There is a microprocessor on the display pcb that controls the backlight function as well as numerous other functions which you say appear to be working OK.
''Be very careful when trying to test for the voltage'' as you don't want to slip when using the DMM (Digital MultiMeter) and causing more problems than what you had before you started, especially as the power will be connected.
Here is a link to the Bose 3-2-1 [https://elektrotanya.com/bose_av321_troubleshooting.pdf/download.html|service manual] which should be of some help as it has the all the circuit diagrams of the unit. (On p.46 it also describes how to test the display module)
To download the file when the sentence below the Document preview box changes from ''This file is downloadable free of charge: ...processing...'' to ''This file is downloadable free of charge: Get Manual'' click on the ''Get Manual'' as this is the download link. Be patient it takes a little while to find the file.
If you find this too daunting, I suggest that you contact a reputable, professional electronics repair service (preferably skilled in audio receiver repairs) and ask for a quote to repair the unit.