No Vertical Output And Retrace Line No Blanking; Spot Killer Ng - Acer 7277e Service Manual

4.8 No Vertical Output and Retrace Line No Blanking

8. NO VERTICAL OUTPUT &
RETRACE LINE NO BLANKING
NO VERTICAL OUTPUT
CHECK B+ CORRECT ?
PIN 3(+14V) &
PIN 6(+45V)
CHECK IC201 (TDA4856)
PIN12 PIN13 OUTPUT
CORRECT ?
REPLACE
IC201
(TDA4858)

4.9 Spot Killer NG

9. SPOT KILLER NG
CHECK BLANK SIGNAL
UC CKT
4-6
NO IF PIN3 FAILS CHECK FR223
IF PIN6 FAILS CHECK +45V &
FR234
YES
REPLACE
IC202
(TDA8351)
YES
NO
OK
CHECK
R225,R224
NG
CHECK Q203 CIRCUIT
OK
CHECK CONNECTOR
P102 G1 VOLTAGE
G1=0
CHECK
Q202
OK
CHECK
R216,R217,R218
HOLDDOWN CKT
No Copy/Reproduction Allowed
NO VERTICAL BLANKING
CHECK IC202(TDA8351)
PIN8 OUTPUT CORRECT?
OK
NG
REPLACE
CHECK
NG
R254,C223,Q202,R239,
R232
SPOT KILLER NG
CHECK -190V
NO
YES
CHECK -190V TRACE
G1< -50VDC
NG
REPLACE
OK
API Confidential
REPLACE
IC202
OK
(TDA8351)
CHECK
IC201(TDA4856)
PIN16 OUTPUT
CORRECT ?
YES REPLACE
IC201
(TDA4856)
CHECK G1 VOLTAGE
IF IT BECOMES
VERY LOW (LESS THAN
-120VDC) WHEN POWER
SWITCH OFF.
YES
CHECK Q202
NG
7277e Monitor Service Guide
NG
NG