Check Ic201 - Acer 7277e Service Manual

4.7 Check IC201

6. CHECK IC201(TDA4856)
CHECK PIN6,PIN8
OK
OUTPUT
(FREQ & DUTY)
CHECK
Q301,Q310,Q311
Q201
OK
CHECK OUTPUT
STAGE
7. PINCUSHION
Troubleshooting
DEFLECTION OUTPUT
ABNORMAL
YES CHECK PIN10(VCC)
=12V ?
NG
CHECK PIN30 NO
>4.4V ?
YES
NG
CHECK
R215,R214
C210
NG
YES
REPLACE
IC201
REPLACE
CHECK FBT(T301)
NG
TRAPEZOID NG
UNBALANCE NG
PARALLEGRAM NG
H-PHASE NG
V-CENTER NG
REPLACE
IC203
(LM7812)
YES
CHECK CHECK
R251,R253 SUSPEND SIGNAL
R249,C216 ="HIGH"
NG
REPLACE
OK
CHECK
Q702
NG
CHECK
POWER SUPPLY
GEOMETRIC FUNCTION NG
CHECK MCU,IF OK REPLACE IC
API Confidential
No Copy/Reproduction Allowed
NO
OK
CHECK +14.5V
YES
CHECK Q701
EMITTER
=14.5V
CHECK
POWER SUPPLY
YES
NG
NO CHECK
REPLACE
Q702
Q701
OK
CHECK +16V
TRACE SHORT?
OK
REPLACE
SHORT
COMPONENTS
NO
4-5