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Symptoms 2: – X-ray protection
– One vertical line and then high voltage shut down.
Are D505, C502, R506, R503 and
C445 ok?
Yes
Check and replace Q402, Q508,
D409, D408, D403, IC401.
Check and replace Q203, IC202.
2
7-2-13 I
C Failure
– Almost data (Horizontal drive duty, FBT B+ duty, display image data, color data) is transferred
from IC203 to IC101 and IC401 through I2C data line during power on.
– After user adjusts display image data, contrast and brightness data, these are saved to IC203.
Key check (7-2-18)
Is 5 V on IC401's Pin 32 and
IC203's Pin 8?
Yes
Is there data communication on
14
IC401's Pins 30 and 31?
Yes
Is there data communication
on IC401's Pins 30 and 31 during
14
I
2
C function? (H/V Posi, V_Size,
S_Pin, Trap, Cont, Brit)
Yes
Done
CHA42*7L/5**7L
No
Check and replace it.
No
Check and replace it.
No
No
2
Check I
C data and clock line.
Check and replace I
(IC101, IC401, IC203)
2
C devices.
7 Troubleshooting
WAVEFORMS
14
5.92 V (IC203, #5, 6)
CH1 P-P = 5.92 V
CH1 RMS = 3.812 V
CH1 : IC401's Pin 31
CH2 : IC401's Pin 30
7-15
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