LC-28HM2E (serv.man2). text - Sharp TV Service Manual (repair manual). Page 48

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48
LC-28HM2
AN-28SP2
TROUBLE SHOOTING TABLE
 (Continued)
No picture
No picture of component line and PC line signals
No synchronization
No
Is there normal signal input at pin 
(8) of IC403, IC404 and IC405?
Check IC403, IC404, IC405 and 
their peripherals.
Ye
s
Check IC415, IC416, 
IC417 and their 
peripherals.
No
PC line
Component line
Is there normal signal output at pin 
(2) of IC403, IC404 and IC405?
Ye
s
No
Is there normal signal output at pin 
(9) of IC403, IC404 and IC405?
Ye
s
No
Check the peripherals of 
IC406.
AV line
PC line
Ye
s
No monitor output
No
No
Is there normal video output 
at pin (41) of IC401?
Check the peripherals of 
IC401.
No
Is pin (5) of IC505 at low 
level?
Check IC505.
No
Check the peripherals of 
IC505 as well as those of 
IC303, Q306, Q401, Q402, 
Q403, Q404 and Q405.
Are there H/V sync signals 
outputs at pins (15) and (22) 
of IC1901?
No
Check the peripherals of 
IC1901, pin (18) of IC801, 
and the peripherals of IC406.
Ye
s
Is there proper 
synchronization between the 
H/V sync signals at pins (15) 
and (22) of IC1901 and the 
video output signals at pins 
(41), (42) and (43) of IC801?
No
Check pins (3), (4) and (21) 
of IC1901, and the 
peripherals of IC406.
Ye
s
Check IC418, IC419, IC420 
and their peripherals.
It is possible that PC I/F unit 
(CPCi-0040CE11) is in 
trouble.
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