Hi everyone, amazing forum, smart people… this is my first post so be gentle:
The set is 4.5 yrs old, been kept in decent clean condition and used most days.
Any guidance as to my next step would be most appreciated.
Symptoms at moment of failure:
At moment of failure, screen flashed vertical coloured lines 1cm wide with 1cm gaps then sound “BINK!” then blank screen.
This only happened once and it was my wife who witnessed it. Can't reproduce it.
Symptoms now:
Blank screen (no backlight), no audio – the set feels dead.
No difference if I plug in different sources.
BUT
External power is applied – green power light comes first and stays on consistently.
Remote command is sensed (green flickers with remote buttons) and remote will turn off set (green to red led.)
Inside the set: (see pics)
No smell or evidence of burn.
When power on, can feel main board chip beneath heatsink warming up – but by no means excessive.
Main PS fuse good.
Measured voltages as follows in “on” state (green led showing) and “off” state (red led showing) – exactly the same voltages in both states.
PS board measurements
CN 6401 upper right side of PS board (connecting PS to main board) – from top to bottom
T-CON-ON = 0
T-CON VCC–12V = 0
NC = 0
DIMMER = 3.1
BL-ON = 0
BL-ERR = 3.3
REG 12V = 12.7
REG 12V = 12.7
REG 12V GND = 0
REG 12V GND = 0
AU 12V = 12.7
POWER ON = 3.3
ACOFFDET = 3.3
STBY3.3V = 3.3
CN6402 upper left side of PS board, top to bottom (connecting PS to inverter)
UNREG 24V = 25.7
UNREG 24V = 25.7
UNREG 24V = 25.7
UNREG 24V = 25.7
UNREG 24V = 25.7
GND = 0
GND = 0
GND = 0
GND = 0
GND = 0
BL-ERR = 3.3
BL-ON = 0
NC (ADIM) = 0
DIMMER = 3.1
CN6403 upper side of PS board towards the right (connecting PS to tcon board) (reading left to right)
(in [brackets] below are pins on the board that aren't used by the connector ribbon - as you'll see from the pic)
[0 REG 12V GND = 0]
0 TCON 12V GND = 0
0 TCON 12V GND = 0
0 TCON VCC 12V = 0
0 TCON VCC 12V = 0
[REG 12V = 12.69]
Thanks for reading.
The set is 4.5 yrs old, been kept in decent clean condition and used most days.
Any guidance as to my next step would be most appreciated.
Symptoms at moment of failure:
At moment of failure, screen flashed vertical coloured lines 1cm wide with 1cm gaps then sound “BINK!” then blank screen.
This only happened once and it was my wife who witnessed it. Can't reproduce it.
Symptoms now:
Blank screen (no backlight), no audio – the set feels dead.
No difference if I plug in different sources.
BUT
External power is applied – green power light comes first and stays on consistently.
Remote command is sensed (green flickers with remote buttons) and remote will turn off set (green to red led.)
Inside the set: (see pics)
No smell or evidence of burn.
When power on, can feel main board chip beneath heatsink warming up – but by no means excessive.
Main PS fuse good.
Measured voltages as follows in “on” state (green led showing) and “off” state (red led showing) – exactly the same voltages in both states.
PS board measurements
CN 6401 upper right side of PS board (connecting PS to main board) – from top to bottom
T-CON-ON = 0
T-CON VCC–12V = 0
NC = 0
DIMMER = 3.1
BL-ON = 0
BL-ERR = 3.3
REG 12V = 12.7
REG 12V = 12.7
REG 12V GND = 0
REG 12V GND = 0
AU 12V = 12.7
POWER ON = 3.3
ACOFFDET = 3.3
STBY3.3V = 3.3
CN6402 upper left side of PS board, top to bottom (connecting PS to inverter)
UNREG 24V = 25.7
UNREG 24V = 25.7
UNREG 24V = 25.7
UNREG 24V = 25.7
UNREG 24V = 25.7
GND = 0
GND = 0
GND = 0
GND = 0
GND = 0
BL-ERR = 3.3
BL-ON = 0
NC (ADIM) = 0
DIMMER = 3.1
CN6403 upper side of PS board towards the right (connecting PS to tcon board) (reading left to right)
(in [brackets] below are pins on the board that aren't used by the connector ribbon - as you'll see from the pic)
[0 REG 12V GND = 0]
0 TCON 12V GND = 0
0 TCON 12V GND = 0
0 TCON VCC 12V = 0
0 TCON VCC 12V = 0
[REG 12V = 12.69]
Thanks for reading.
Attached Files
Comment