Samsung MZ467 Service Manual page 16

VERTICAL TROUBLE
No vertical sweep display
YES
Check pin8 of IC202
YES
Failure of C210,V-DY
YES
Check vert, synchronization
YES
Check signal input of
vertical sync
YES
Failure of IC202,C204,C205
I
HORIZONTAL TROUBLE
I
I
r
Check signal input
I
YES
[- Does waveform appear at the
collector of 0301
?
I
YES
I
Check pin15 of IC202
I
I
I
I
J
NO
NO
NO
NO
NO
Failure IC202
Signal cable loose or bad
Signal cable loose
Failure R301
Failure 0301, R303,
C301,R304
I
YES
NO
L -_ _
C_h_ec_k_p_i_n9 __
m~I_C_20_2
________
~J-------------------------[L--
___
F_a_ilu_r_e_IC_2_0_2_,IC_1_0_1 ____ __
YES
I
Does drive pulse appear at
L
base of 0303
?
YES
Does 20V appear between the
pin4 of T302 and ground ?
I
YES
CCheck DY,T302,L401 ,L402,0303]
NO
Failure R313,T301,Q302
NO
Failure D301 ,C404
19
MDA MODE ERROR
[ .
~---.---~
I
Check the PC's video card
I
mode switch setting
~
I YES
Does DC 3V appear at the
pin3 of IC201
?
I YES
collector of 0101 ?
l
I
I
Does OV appear at the
- - _ - - , - - - - - - - - - - - - - - - - - - - - l
I
YES
i
Does DC 12V appear at the
collector of 0103?
I
YES
Replace IC201,IC202,REY102
CGA MODE ERROR
Check the PC's video card
mode switch setting
YES
Does DC 11.5V appear at the
collector of 0101 ?
YES
I-
I
Check IC101, IC202, REY102
L or replace it.
MODE CHANGE ERROR
NO
NO
NO
NO
NO
NO
* When an error occur in mode change, Check IC101 or IC201 carefully.
20
Change the MDA MODE
J
Failure C201 ,IC201
I
I
Failure 0101
r
Failure 0102,0103
I
I
Change the CGA MODE
Failure 0101