Sony KF-WE50A1 Service Manual page 7

• The failure record is not automatically cleared.
So after repair, be sure to check the record and set it to "0" manually.
< To clear the failure record >
If the screen display is already on, the following step 1 and 2 can be skipped.
1. Power off (Set to the standby mode)
2. DISPLAY
3. Channel 8
< To clear the Self-diagnosis screen display >
• The self-diagnosis screen display is cleared by turning off the set with a remote commander or the power switch.
5. Self-Diagnosis function operation
• 3 : Lamp cover
• 4 : Fan
• 4 : Temp
• 5 : Lamp driver
• 6 : Low B error
• 8 : D-OVP
• 9 : Audio
• LAMP : Lamp
t Channel 5 t
t ENTER
The rib at the back of the lamp cover closes the SW on T board to ground pin 3 of
CN8001.It's monitored by the DE-micro (Pin 94 of IC6902) and turns off the lamp when
it's open.
Fan rotation is detected by "FAN-PROT"and the DE-micro (Pin 92 of IC6902) turns off the
lamp when it's "high".
When the temperature sensor on the H3 board (WE) or H4 board (WF/XS) detects high
temperature or IIC-E line connector (CN6022:G2 board, CN44: H3/H4 board)is not sested
securely, DE-micro turns off the lamp.
When the "LAMP-PROT" (pin 95) is low, lamp is not turned on.
If the "LAMP-HV-DET" (pin 96) is low at the same time, it is classified as no high voltage
of the lamp driver.
When no "DD 6V" is detected, pin 129 of TV-micro is low and it turns off the main power.
When overvoltage of "+3.3V" or "+2.5V" is detected, pin 126 of TV-micro is low and it
turns off the main power.
When DC voltage is detected at the speaker or woofer outputs, pin 128 of TV-micro is low
and it turns off the main power.
When the "LAMP-PROT" (pin 95) is low, lamp is not turned on.
If the "LAMP-HV-DET" (pin 96) is high at the same time, it is classified as no lamp or dead
lamp.
KF-WE42A1/WE50A1/WS60A1
Vol - t POWER
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RM-1022 RM-1022 RM-1022