Hello all,
I've been trying to solve this issue and maybe someone can make me check in the right direction.
Sony KDL-46R450A no status red LED, no Green LED, no power. TV wouldn't turn on 6 hours after beeing turned off last week
PSU 1-888-122-12 (GL5 APS-350)
Some kind of relay click is present on PSU. repeats every 4-5 seconds.Power button pressed makes no difference.
Cable to mainboard voltages measured at different pins
Ground taken from Ground Screw on secondary in all tests (except for Primary cap)
(PSU AS IS still hooked up from inside TV.)
1 GND
2 VCC_3.3_STBY = jumps from 0.6V to 1.14V after each "relay" click
3 GND
4 POWER_ON/OFF = 0V
5 VCC_12V = 0V
6 ACC_OFF_DET = 0V
7 VCC_12V = 0V
8 BLKT_EN = 0V
9 AUDIO_12V = 0V
10 BL_CNTL = 0V
11 AUDIO_12V = 0V
12 BKL_ERR = 0V
13 VCC_12V = 0V
14 GND
15 VCC_12V = 0V
16 GND
Main CAP from Primary (450V 82uF) measured straight at pins voltage jumps from 240V to 260V at each relay click
If I disconnect cable from PSU to Mainboard (Differences from previous results)
no relay clicks
2 VCC_3.3_STBY = 3.3V
6 ACC_OFF_DET= 3.3V
Main CAP from Primary = 164V
Took PSU out of TV Checked Main Fuse (not open) and different components.
no relay clicks
Put a 1k Ohm between VCC_3.3_STBY and POWER_ON/OFF:
2 = 3.3V
4 = 3.3V
5 = 12V
6 = 3.3V
7, 9, 11, 13, 15 = 12V
8, 10, 12 = 0.02V
Main CAP from Primary = 399V
I ve checked many fuse resistors none are open, no indication of burned components
Checked mosfets none seem shorted
Any help on anything I should look for next ? Could it be a mainboard issue ? I just find it weird with the no power at all.
Thank you so much
I've been trying to solve this issue and maybe someone can make me check in the right direction.
Sony KDL-46R450A no status red LED, no Green LED, no power. TV wouldn't turn on 6 hours after beeing turned off last week
PSU 1-888-122-12 (GL5 APS-350)
Some kind of relay click is present on PSU. repeats every 4-5 seconds.Power button pressed makes no difference.
Cable to mainboard voltages measured at different pins
Ground taken from Ground Screw on secondary in all tests (except for Primary cap)
(PSU AS IS still hooked up from inside TV.)
1 GND
2 VCC_3.3_STBY = jumps from 0.6V to 1.14V after each "relay" click
3 GND
4 POWER_ON/OFF = 0V
5 VCC_12V = 0V
6 ACC_OFF_DET = 0V
7 VCC_12V = 0V
8 BLKT_EN = 0V
9 AUDIO_12V = 0V
10 BL_CNTL = 0V
11 AUDIO_12V = 0V
12 BKL_ERR = 0V
13 VCC_12V = 0V
14 GND
15 VCC_12V = 0V
16 GND
Main CAP from Primary (450V 82uF) measured straight at pins voltage jumps from 240V to 260V at each relay click
If I disconnect cable from PSU to Mainboard (Differences from previous results)
no relay clicks
2 VCC_3.3_STBY = 3.3V
6 ACC_OFF_DET= 3.3V
Main CAP from Primary = 164V
Took PSU out of TV Checked Main Fuse (not open) and different components.
no relay clicks
Put a 1k Ohm between VCC_3.3_STBY and POWER_ON/OFF:
2 = 3.3V
4 = 3.3V
5 = 12V
6 = 3.3V
7, 9, 11, 13, 15 = 12V
8, 10, 12 = 0.02V
Main CAP from Primary = 399V
I ve checked many fuse resistors none are open, no indication of burned components
Checked mosfets none seem shorted
Any help on anything I should look for next ? Could it be a mainboard issue ? I just find it weird with the no power at all.
Thank you so much
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