Question Sony XBR55X850C no picture has sound

Burton250

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Mar 26, 2015
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Hello, I have a Sony XBR-55X850C and I have no backlight, no display but I do have sound.

When I first turned the tv on it flashed 6 red LEDs. Looked up the code and it said it could be the backlights or the main or power supply board. I opened the tv up and seen that the main board was getting voltage for a few seconds then shutting off. I disconnected the T-Con board, the backlights came on. It was displaying a series of colours. I turned the tv off and plugged the T-Con board back in. When I turned it on the LED say there bottom was flashing between Orange and Green, indicating it needs a firmware update. Followed the instructions on the Sony website for updating with a memory stick. It does say to follow the instructions on the screen (can't do as there is no display) . If I press the power button I get a white LED to come on, still no display or backlights. The 6 red LEDs have not come on since. I tested the backlights and they still work. Unplugging the T-Con board doesn't display the colours either.

Below are the voltages I'm getting with the power on.

Backlight 1+2 68V

1- NC - No Pin
2 - DC_dimmer 0V
3- BL_ON 0V
4 - PWM_DIMMER 0V
5 - STBY_3.3 3.47V
6 - BLINKING 0V
7 - AC_OFF_DET 3.48V
8 - BL_ERR 2.5V
9- POWER_ON 3.4V
10- GND - n/a
11- GND - n/a
12- GND - n/a
13- REG12V 12.6V
14- REG12V 12.6V
15- REG12V 12.6V
16- REG12V 12.6V
17- REG12V NO PIN
18- REG12V 12.6V
19 - GND n/a
20 - GND n/a
21 - GND n/a
22 GND n/a
23 GND n/a
24- TCON_ON 0V
25- TCON_VCC_12 0V
26- TCON_VCC_12 0V
27- TCON_VCC_12 0V
28- TCON_VCC_12 NO PIN
 
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