Haier 21FA18-T Service Manual page 25

A2. Main integrated circuits:
(1) Haier8873
(2) STV9302A
(3) AN7522N
A3. Error Detection Process
1.
Check VD604~VD607,
C607, N601, N604 etc.
collector voltage of V598
Normal
Check to see
if , 8v,
5v is normal
Normal
The failure of horizontal
The failure ofhorizontal unit
unit orN201
orN204
Microprocessor
Picture IF/sound IF/video processing/H and V
Scan/color decoding
Vertical output integrated circuits
Sound power amplifying integrated circuits
No light and sound
Check to see if
Fuse is normal
Normal
Normal
Check to see if the
is 27V
Abnormal
Check the control
voltage of V599 or
CPU power pin
Check N202 ,ect
Check to see 110V、180V
etc. voltage is normal
T est to see all terminal
Resistance of load
Normal
Check switch
power unit
Abnormal
Normal
23
Abnormal
Abnormal
Abnormal
Check to see if
rectifying tube
is normal
Check the
Loader
rectifying diode
Abnormal
Change