Read Sharp LC-28HM2E (serv.man2) Service Manual online
45
LC-28HM2
AN-28SP2
TROUBLE SHOOTING TABLE
(Continued)
No sound
No sound
No
Are there normal audio outputs
from pins (38) and (40) of
IC401?
No line output
Check the peripherals of IC401.
No
Ye
s
Check the peripherals of IC302.
Check the peripherals of IC704.
No
No color production regardless of
color system change
No
Color production with NTSC, but
no color with PAL and SECAM
No
No color production only with
PAL
No color production only with
SECAM
Check the peripheral circuits of IC801 (iX3323CE).
Check the peripheral circuits of
IC2802 (TA1229N).
Ye
s
No
Are there normal audio outputs
from pins (10) and (16) of
IC302?
Are pins (5) and (7) of IC302
at low level?
Ye
s
No
Are there normal audio outputs
from pins (1) and (7) of IC304?
Check the peripherals of
IC304.
Ye
s
No
Is pin (5) of IC505 at low level?
Check IC505.
Ye
s
Check the peripherals of IC505,
IC303, Q306, Q301, Q302, Q309
and IC307.
No component and PC signals output
Check the peripherals of
IC410, Q407, Q408 and
IC401.
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