KDL-70X4500 (serv.man3) - Sony TV Service Manual (repair manual). Page 17

KDL-70X4500 (K)     2-4

2-2-2. SET REBOOTS

TV micro (on AU board) is monitoring if BE Micro & EMMA (on FBU board) are alive
or on abnormal status by watch dog timer. When BEM or EMMA has not boot up, TVM
try to re-start. We can see chassis reboot at this case. Check whether FBU board is
supplied with correct power or not.

- FBU board
   - CN4002 12V power and harness to G8 board.
   - F2800, F4100, F4101, F4102, F5400, F7800, F7801  conduction.

If power rail has no problem, replace FBU board.

2-2-3. SELF DIAGNOSIS

2-2-3-1. RED LED BLINKS TABLE

When self diagnosis happens, STBY (RED) LED blinks and
the history can be seen on display by self diagnosis mode.

Power Error (watching 12V rail)   

T-CON Error
[CCFL] Panel Inverter Error

[LED] GL board Error

Panel Temperature Abnormal Detection

Audio Abnormal Detection

FAN Error -> Not detect (reboot operation)

[CCFL] Panel Balancer Error
[LED-BL] SPI Error (Babylon Communication Error)

Contents

Display

(Self Diagnosis mode )

Red LED Blink 

POW_ERR1

T_CON

BACKLITE

PANELTEMP

AUD_PROT

FAN_ERR

BALANCER

2

5

6

7

8

9

13