Samsung SYNCM.400B Service Manual page 55

6 Troubleshooting
6-8 User Controls Don't Work
Does the DC level change at
Pins 29, 30, 31 and 32 of IC201 when
you push the front panel button?
Yes
Does the DC level change at
the positive pole capacitors
when you push the
front panel button?
(See table 6-2)
Yes
Check IC202 and RESET circuit.
Table 6-2. Front Panel Button
Location
C207
C208
C209
6-6
No
No
Function
Horizontal Size
Contrast
Brightness
Check the button
(SW201~SW203,
SW205~SW208 and SW211)
Check IC202.
CKA42*7L/5227L