Sony GN3UN - H Board Troubleshooting Flow

3g.1.1 H Board Troubleshooting Flow
3g.1.1 H Board Troubleshooting Flow (For KM/KL all models) - General Checking
TV cannot be controlled
by remote commander
No
Yes
Check White LED
at Power LED indicator.
Is it lighted up?
Check voltage at
Pin1 of Hboard connector
(refer next page)
Is it 5V?
No
Place remote commander (RC)
near to window and press RC key.
Is the LED blinking?
Yes
No
Main IC SIRCS line broken.
Change B-board
Check SIRCS voltage
using multimeter
at R5047 on B board.
Then press and hold RC key and
observe voltage drop.
Does it drop
from 3.1V to (<2.9V)?
Change Mechanical part
(ex. Ornamental panel,
or guidelight)
Yes
Yes
Condition: TV is plugged to AC power supply,
and AC power supply is turned ON.
Check voltage at resistor of
5V source of B board.
Is it 5V?
Yes
No
STBY5V NG. Refer to DDCON
troubleshooting section
No
IR sensor broken.
Change Hboard.
Check Hboard to B board
harness condition.
Is it connected properly?
Yes
No
Connect harness properly
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