Mitsubishi Electric 1786FD2 Service Manual page 83

MEA 1786FD2 CRT Monitor Service Guide
7. PINCUSHION NG
TRAPEZOID NG
UNBALANCE NG
PARALLEGRAM NG
H-PHASE NG
V-CENTER NG
8. NO VERTICAL OUTPUT &
RETRACE LINE NO BLANKING
NO VERTICAL OUTPUT
CHECK B+ CORRECT ?
PIN 3(+14V) &
PIN 7(+45V)
YES
CHECK IC201 (TDA4856)
PIN12 PIN13 OUTPUT
CORRECT ?
NO
REPLACE CHECK
IC201 R275,R274
(TDA4856)
GEOMETRIC FUNCTION NG
CHECK MCU,IF OK REPLACE IC201
NO IF PIN3 FAILS CHECK FR223
IF PIN7 FAILS CHECK +45V &
FR234
OK
REPLACE
IC202
(TDA4866)
YES
OK
NG
NO VERTICAL BLANKING
CHECK IC202(TDA4866)
PIN8 OUTPUT CORRECT?
NG
REPLACE
CHECK
IC201(TDA4856)
PIN16 OUTPUT
CORRECT ?
CHECK
NG
R254,C223,Q202,R239,
R232
Trouble Shooting
NG
REPLACE
IC202
OK
(TDA4866)
NG
YES REPLACE
IC201
(TDA4856)
8