Re: TCL 55S405TBBA - backlights on, no video; T-con and main board replaced.
Re "power down statement" -- From the "ON" state - i press the power button on the remote, the TV status does the fast "on-off-on-off-on-off-on-off" blink when receiving the IR command. The unit doesn't really turn "OFF" - all it does is turn off the backlights. I think this what i recall seeing on other working TCL sets. Turning it back on -- it's purely just a backlights needing to come on again, without the "initialization slow blink" sequence.
Yeah, it does appear that the main board thinks things are okay.
VGL is (-5.51V) on the T-CON.
VGL has a test point on the "left" tab board and measures (-5.51V)
VGL has a test point on the far "right" tab board and also measures (-5.5V ~)
Please refer to the voltage spreadsheet in post #19 for locations.
If this is supposed to sit around (-12V) - who is the consumer of VGL in a LCD??
With everything connected - VGL to GND is ~33kOhm. With the right cable disconnected, the right side measures ~41Kohm to GND on the right VGL test point.
Originally posted by budwich
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Yeah, it does appear that the main board thinks things are okay.
VGL is (-5.51V) on the T-CON.
VGL has a test point on the "left" tab board and measures (-5.51V)
VGL has a test point on the far "right" tab board and also measures (-5.5V ~)
Please refer to the voltage spreadsheet in post #19 for locations.
If this is supposed to sit around (-12V) - who is the consumer of VGL in a LCD??
With everything connected - VGL to GND is ~33kOhm. With the right cable disconnected, the right side measures ~41Kohm to GND on the right VGL test point.
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