DOWNLOAD Sony KDS-50A2020 / KDS-55A2020 / KDS-60A2020 Service Manual ↓ Size: 7.73 MB | Pages: 127 in PDF or view online for FREE

– 12 –

- One blink is not used for self-diagnosis.

- Example
Diagnosis item

LED blinks

Lamp cover

3 times

Fan

4 times

LED ON : 0.3sec
LED OFF : 0.3sec

The POWER/STANDBY indicator blinking display is released by removing the plug from
the power or leaving for 2 minutes.

- In cases of malfunctions where it is not possible to determine the symptom such as when

the power goes off occasionally or when the screen disappears occasionally, there is a
screen display on whether the malfunction occurred or not in the past (and whether the
detection circuit operated or not) in order to allow confirmation.

- Quickly press the remote command button in the following order from the standby state.

Channel

Vol

Be aware that this differs from the method of entering the

service mode (Vol +).

LED OFF

3.0sec

DISPLAY

5

-

POWER

002 : TEMP

001

003 : L_COVER

000

004 : FAN

003

005 : L_DRIVER

000

006 : POWER

000

007 : AUDIO

000

008 : P_OVP

000

009 : DEVICE

000

101 : DTT_WDT

000

102 : TVM_WDT

002

103 : WEM_WDT

000

 104 : DEM_WDT

000

 12345-67890

SELF CHECK

* The boot count is increased at all power on timing.
    (AC Off ->Power On, Main SW Off -> Power On, Standby -> Power On)
* The total power on time is written to NVM at 1 time per a hour.

002

: LED blink times

TEMP : Panel Temp Error
001

: Error count (Max 255)

102

: Error number

TVM_WDT : Reboot micro
002

: WDT count (Max 255)

Display rule
12345-67890 : alternately display
(ex.)

Boot Count

13579 times

Total power on time 

24680 hours

Each max is 99999

POWER indicator

LAMP indicator

– 13 –

- The results display is not automatically cleared. In case of repairs and after repairs, check

the self-diagnosis screen and be sure to return the results display to "0".

- If the results display is not returned to "0" it will not be possible to judge a new malfunction

after completing repairs.

1. Power off (Set to the standby mode)

2.

Channel

Vol

3. Channel

- When ending the self-diagnosis screen completely, turn the power switch OFF on the

remote commander or the main unit.

8

ENTER

DISPLAY

5

-

POWER

2

:

Temp over

When the inside temperature sensed with IC3150, IC3200 and IC2000  
mounted on S1 board, S2 board and C board respectively exceed  
the threshold, DEM (Display Engine u-com) detects it and makes 
turn off the lamp. 

3

:

Lamp cover

When the lamp cover is opened or harness from T board is off, DEM detects it 

and makes turn off the lamp

4

:

FAN error 

When any FAN is stopping or harness is not connected correctly, 
DEM detects it and makes turn off the lamp

5

:

Lamp Driver

When the ballast is not working with high voltage, DEM detects it and makes 
turn  off the lamp

6

:

Power error

When the voltage converted on 5V regulated from 11V is low, TVM
(TV u-com) detects it and makes turn off the lamp.

7

:

Audio

When DC is appeared by audio amp failure at speaker line, DEM detects it 
and makes turn off the lamp.

8

:

Power-OVP

When the output voltage from 7V is abnormally high, TVM detects 
it and makes turn off the lamp.

9

:

Device error

When the temperature sensor and bus decoder ICs do not return ACK on IIC 

 

bus to DEM, DEM detects it and makes turn off the lamp.

LAMP

:

Lamp

When the lamp is broken, DEM detects it.

– 14 –

3

2

1

Pull the claw

Lamp door

7 screws (+BVTP2 4x16)

Rear cover

Note: Photographs in this section are KDS-50A2000/55A2000/60A2000. KDS-50A2020/55A2020/60A2020 are metallic black

models, the structure is quite same as KDS-50A2000/55A2000/60A2000 though the color is different.

– 15 –

2

Screw (+BVTP2 4x16)

1

Connectors

3

3