Sharp 19SV111 - Page 13

19SV111
TROUBLE SHOOTING TABLE <continued)
Symptom
Display Black
Sound normal.
No sound.
Repair Procedure
1. Make sure that picture signal is being output from
ICS PPU pin (21).
2. Make sure that soldering for Q 1, FC2, Q4, l1,
R23 and R2 is secure.
3. Check for other faulty soldering or breaks in the
conductor pattern.
1. Is there faulty soldering or a fa u I ty part in the
asci llation circuit (near X 1, 02 or 03) ?
2_ Are oscillation frequencies and input voltage
levels of ICG CPU pin (29) and ICS PPU pin ( 18)
normal?
Faulty soldering or a break in the conductor
pattern.
Location of Fault
(in order of probability)
(1) ICSPPU
(2) Faulty soldering or a
break in
the
conductor pattern.
(1) Xl
(2) Faulty soldering or a
break in the
conductor pattern.
(3) IC10
~----------------~------------------~------------------~------------------·--
Display Flashes
1. Is the Game Pack normal' Is it installed correctly?
(1) 1(10
2. Is there any fau I ty soldering or a break in the
(2)
Card connector
conductor
pattern I
"DE" 72P
Display repeatedly
3. Is 1(1 0 faulty., (3)
Faulty soldering or a
appears
and dies.
IC9 faulty.
break in the
conductor pattern_
(4)
1(9
Normal Display Doesn't Appear
Abnormality occurs 1. Heat up ICS PPU using a hair dryer or the I ike_
( 1)
ICS PPU
after playing the
If faulty symptoms appear, then the PPU is faulty.
(2)
iC6 CPU
game for a long
2_
Heat up ICG CPU using a hair dryer or the like_
time.
If faulty symptoms appear, then the CPU is faulty.
1. Is there faulty soldering or a break in the
( 1)
IC45-RAM
conductor pattern in or near IC4 S·RAM, IC2, IC9
(2)
IC2
HC 139 orca rd connector "DE" 72P ?
(3)
Faulty
soldering or a
Moving characters
2. Is IC4 5-RAM, IC2, 1(9 HCU04P or lC5 PPU faulty?
break in the
OK, But non-
Card connector "DE" 72P faulty.
conductor pattern.
moving characters
(4)
IC9
and background
(5)
Card connector
abnormal.
"DE" 72P
(6)
IC5 PPU
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