Upon inspecting the components even closer again after Conor Bailey above suggested to check for burned caps or similar, I noticed a slight yellow taint to the text ontop of the backlight inverter (as seen on the images below). After desoldering the transformer spool and flipping it around, I could immediately see a part of the spool being covered with black material and that it was a bit burnt.
It appears as if the inverter spool somehow got overloaded and burnt its wires at one winding. As the transformer is directly connected to the backlight ports (by tracing the pcb from the transformer), this explains why they turn off as soon as more load is running through (exactly what happens when a signal cable is plugged in -> the backlights need more power and additional backlights get turned on)
If you have this or a similar issue, make sure to check the backlight inverter transformer, as they commonly get a burnout on their bottom side!
[image|1048206]
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Notice how the windings of the spool look clean on the lower part of the picture, while one winding segment (where my tweezers point to) at the top part of the picture is completely burnt. Checking the resistances confirms that indeed electricity can't get through that part of the spool. The extreme heat the transformer gives off while running also confirms the above, as there is much greater resistance.
[image|1048204]
The next step is to find a fitting replacement part, oh well!
Upon inspecting the components even closer again after Conor Bailey above suggested to check for burned caps or similar, I noticed a slight yellow taint to the text ontop of the backlight inverter (as seen on the images below). After desoldering the transformer spool and turning it around, I could immediately see a part of the spool being covered with black material and a bit burnt.
+
Upon inspecting the components even closer again after Conor Bailey above suggested to check for burned caps or similar, I noticed a slight yellow taint to the text ontop of the backlight inverter (as seen on the images below). After desoldering the transformer spool and flipping it around, I could immediately see a part of the spool being covered with black material and that it was a bit burnt.
It appears as if the inverter spool somehow got overloaded and burnt its wires at one winding. As the transformer is directly connected to the backlight ports (by tracing the pcb from the transformer), this explains why they turn off as soon as more load is running through (exactly what happens when a signal cable is plugged in -> the backlights need more power and additional backlights get turned on)
If you have this or a similar issue, make sure to check the backlight inverter transformer, as they commonly get a burnout on their bottom side!
[image|1048206]
[image|1048204]
The next step is to find a fitting replacement part, oh well!
Upon inspecting the components even closer again after Conor Bailey above suggested to check for burned caps or similar, I noticed a slight yellow taint to the text ontop of the Backlight inverter (as seen on the images below). After unsoldering the transformer spool and turning it around, I could immediately see a part of the spool being covered with black material and a bit burnt.
+
Upon inspecting the components even closer again after Conor Bailey above suggested to check for burned caps or similar, I noticed a slight yellow taint to the text ontop of the backlight inverter (as seen on the images below). After desoldering the transformer spool and turning it around, I could immediately see a part of the spool being covered with black material and a bit burnt.
It appears as if the inverter spool somehow got overloaded and burnt its wires at one winding. As the transformer is directly connected to the backlight ports (by tracing the pcb from the transformer), this explains why they turn off as soon as more load is running through (exactly what happens when a signal cable is plugged in -> the backlights need more power and additional backlights get turned on)
If you have this or a similar issue, make sure to check the backlight inverter transformer, as they commonly get a burnout on their bottom side!
[image|1048206]
[image|1048204]
The next step is to find a fitting replacement part, oh well!
I believe I have figured it out.
Upon inspecting the components even closer again after Conor Bailey above suggested to check for burned caps or similar, I noticed a slight yellow taint to the text ontop of the Backlight inverter (as seen on the images below). After unsoldering the transformer spool and turning it around, I could immediately see a part of the spool being covered with black material and a bit burnt.
It appears as if the inverter spool somehow got overloaded and burnt its wires at one winding. As the transformer is directly connected to the backlight ports (by tracing the pcb from the transformer), this explains why they turn off as soon as more load is running through (exactly what happens when a signal cable is plugged in -> the backlights need more power and additional backlights get turned on)
If you have this or a similar issue, make sure to check the backlight inverter transformer, as they commonly get a burnout on their bottom side!
[image|1048206]
[image|1048204]
The next step is to find a fitting replacement part, oh well!