Sony KDF-E55A20 Service Manual page 10

Clearing the Result Display
To clear the result display to "0", press the buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
1. If the screen is already displayed, proceed to step 3. If not, Power off (Set to Standby mode).
2. Press DISPLAY
Channel 5
ENT
3. Press Channel 8
Clearing the Self-Diagnostic Screen
The self diagnosis screen display is cleared by turning off the set using the Remote Commander or the power switch.
Self-Diagnostic Circuit
Self-Diagnosis Function Operation
3 : Lamp cover
4 : Fan
4 : Temp
5 : Lamp driver
6 : Low B error
7 : Audio
8 : D-OVP
10 : DTL-OVP
LAMP : Lamp
KDF-E55A20/E60A20
Sound Volume - POWER
The rib at the back of the lamp cover closes the SW on the T board to ground pin 3 of CN8001.
It is monitored by the DE-micro (pin 94 of IC6902) and turns off the lamp when it is opened.
Fan rotation is detected by "FAN-PROT" and the DE-micro (pin 92 of IC6902) turns off the lamp
when it is "high".
When the temperature sensor on the H4 board detects high temperature, or IIC-E line connector
(CN6022:GI board, CN44:H3board/H4board) is not seated securely, the DE-micro turns off the
lamp.
When the "LAMP-PROT" (pin 95 IC6902) is low, the lamp is not turned on. If the "LAMP-HV-
DET" (pin 96 IC6902) is low at the same time, it is classified as no high voltage of the lamp
driver.
When no "SETIIV " is detected, pin 129 of IC3002 is low and it turns off the main power.
When DC voltage is detected at the speaker or woofer outputs, pin 128 of IC3002 is low and it
turns off the main power.
When overvoltage of "+3.3V" or "+2.5V" is detected, pin 126 of IC3002 is low and it turns off the
main power.
When no "Q 5V" is detected, pin 127 of IC3002 is low and it turns off the main power.
When the "LAMP-PROT" (pin 95 IC6902) is low, the lamp is not turned on. If the
"LAMP-HV-DET" (pin96 IC6902) is high at the same time, it is classified as no lamp or a dead
lamp.
KDF-E55A20/E60A20
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