Haier 21F3A-T Service Manual page 21

5
Make C703 open. Multimeter is at band RΧ1K. Red probe
connect to ground. Touch No.7 of N701 with black probe
No noise
Power amplifier is abnormal.
Inspect N701 and peripheral
components of N701
Yes
Inspect N204 and peripheral
component of N204
6.
Yes
Change V611 or
weld V611 again
Picture exists but no sound
Make V701 collector open. Touch
No.7of V701 with black probe to
Yes
Inspect V701、V103
Lack of red
Check to see if V611 is
open or not well welded
No
Inspect R616,R617,R236 Inspect
Maintenance Service and Trouble shooting
Have noise
see if noise exists
Check to see if
+20V exists
Inspect +20V
power supply
No
Check to see if voltages of
XZ601 are normal
Inspect the circuit
from No.50of N204 to
20
No
No
Yes
No.3 of XZ603