Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio FL-R888K FL-R88~3
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TROUBLESHOOTING
1 l
c IC401 Pina input +W(Dl)?
I-i
NO
PN402, CN702 +5V(Dl) check?
t-i
No PN402, CN702 Defective.
.
, *X401 defective.
I
NO + lIC401 defective.
YES
f
Power P.C.B PCTL pattern?
Pattern defective.
NO
w IC702, 703 defective.
IC401 Pin@ HRST output? -
NO
w IC401 defective.
PCTL r
.
HRST ,
YES
\
IC151, 110 RESET Surrounding NO RESET Surrounding circuitry
circuitry? . w defective.
YES
tC102 (H@Pin@, 0, @, @ NO l ICll6 defective.
check? .IC102 defective.
@ nlIfl-{; @ 111 1
mUA& @nllnll
MO1 Pin@, 0, 0, @check? NO lPN402 defective.
@ nllnq @Patterndefective.
O= *
YES
NO
IC401 Pin@ Reset check. m IC401 defective.
YES
OK
11
2, CD PART
DOOR OPENCLOSE CHECK?
2-1.
(LOADING)
2-2. Is rotate turret?
2-3. Is DISC play?
'
2-5. Is audio output?
12
2-l. DOOR OPEN/CLOSE PART (LOADING)
1
IC505 Pin@, @ input? *CLOSE leaf s/w defective.
. . ~ , .)Cl@ (M) pipe, @ &f-d@@_ I
1
0
OPEN L H I
H L
YES
~ 1
lZD501 (5.1V)? NO lZD501 defective.
lIC505 surrounding circuitry lR532, 534, 535 defective.
check? t- l 2V-CD defective.
+l --
YES
1
7
lIC505 defective.
IC505 Pin@, @I output? 00, @I pattern defective. I
YES
1 1
PN505 MOTOR input defective? No -
YES
h 1
I
IPick-up MOTOR?
I
Pick-up defective.
i
OK
13
2-2. TURRET PART
Is Rotation turret?
\ /
NO IC102 (H8) DATA, CLK, XLT .
NO
Limit S/W OV (LOW)check? I + IC102 defective.
* Check?
1 I
YES YES 4
Down leaf S/W (PN505) OV r NO lIC102 Pin@, @I, @I
IC506@, @, @ check?
(LOW) check? * pattern defective.
YES +
(H8) Pin@, 0, 0, @ NO lIC502 Pin @, @, @
p input defective.
lIC502 defective.
.
YES
IC503 Pin@, @ output check?
YES
NO lR51 6 defective.
lC504 Pi@), @ output
check'? lIC502 defective.
I
YES
PN503 input check?
lIC504 Pin@, @ input
YES + NO IC503 Pin@, @ output
b pattern defective.
I PN504 conector check.
I YES
NO
Pick-up check? F Pick-up defective.
YES
I
YES l
OK
14
2-3. DISC PLAY PART (@,a)
0
A When laser does not light.
*
lC102Pif@outputLowcheck? ,
NO ICI 02 Pin @ check? NO
w Limit S/W defective.
c
(m)
I . `limit1 k
IC501 [email protected] (LD) check?
yEsi
I
NO 4C501 defective.
4C501 Pin@ defective.
YES 1
NO lQ5Ol defective.
Q501 Collector 2.OV?
43529 defective.
I \ 4
YES +
NO
PN502 check? w PN502 defective.
1 Pick-up lens check? Pick-up defective.
I J I \
YES
OK
15
/ @ Wh; laser lights.
Does the lens move up and NO IC502 Pin@ output (FEO)?
_
down?
L
YES + YES &
IC501 Pin@ HF output? IC503Pin~,@utputchecK? 4503 Pin@ input
defective.
I 4C503 defective.
I
I I
YES
I NO
+ Q501 defective.
lPN502 defective.
*Pick-up defective.
16
The waveform of IC501 Pin@ *Turntable height error.
is below figure? lserdiodedegraded.
YES 4
4C502 defective.
4C502 Pin@, @ defective.
YES
+
ICI02 (H8) Pin@ FOK input NO
check?
\
I
YES +
IC501 "FEO" ouiput?
(Pino)
I A",,, ' No ~~1
2.5v
YES
4C502 defective.
YES
IC506 MDP signal output?
Pin@ check? l
Ill Ill
YES
IC503 disc MOTOR output NO 4C503 defective.
@J,@I check? 4C503 Surrcunding circuitry
defective.
YES
lPick-updefective.
lPN503 defective.
.
17
2-4. Is lead-in
IC 102 Pin@ input check? . NO
, , ,,, , ,,, + L No. IC506 PI;; w IC502 defective.
,
NO
IC102 Pir@ISQCK check? IC102 (H8) defective.
l-l
IC 506 Pin@ "GFS" input? 1 IC506 defective.
$1 11 11
t
NO lIC506 Pin@pattern defective.
4C506 defective. I
YES V
IC102 (H8) Pin @ SCOR check? NO
w ICI 02 defective.
,
l-m-r
-
18
2-5. Audio signal KARAOKE AND VCD ( @ ,@ )
0
A KARAOKE Audio. 0
B VCD AUDIO.
IC201 Pin11 input check? ICl 01 Pin@ @ @J output?
9 9
,
NO .IC102 defective. NOm IClOl defective.
* l IC102 Pin@)defective.
I
YES + YES +
IC201 Pin@ RESET check?
lC223 Pin@, @ output?
OFF F
.
I NO RESET surrounding circuitry
* defective.
\
YES + YES
OK
lYES 1 Now defective ,
lIC202 IC207 defective.
lC2W DATAADRSLINEcheck?
I14 OX202berective.
IC202 Pin @), @, @J
114 IC202 defective.
output check?
IC217 Pina input check? NO
m IClll defective.
VCD 1 KARAOKE b ,
16226 Pin@,@, @Jinput check? 114 IC217 defective.
19
3. VIDEO PART
3-1. ERROR 0000
I
3-2. PICTURE DEFECTIVE
3-3. COLOR DEFECTIVE
\
3-k S/I (super impose) DEFECTIVE
w 3-4-1.S/I DEFECTIVE
\
m 3-4-2.FONT DEFECTIVE
r
3-4-3.FONT VIBRATION
w 3-4-4.FONT COLOR DEFECTIVE
20
3-l I ERROR 0000
I
\ . .
IClOl (CL484) Pin @ input? NO IC5 Pin@ Check? NO lIC5 defective.
(HS:15.625KHz) * (14.1875MHzk30ppm) ' 0x1 defective.
/ *
I I
1
NO l IC 11 defective.
I& defective. l 1 Pin(ij defective.
ICl
l R94 defective.
YES YES
ICll Pin@ output pattern
IC3 PinQ) output?
defective.
YES+ m t
NO l 1 defective.
ICl
ICll Pin@ output? lR88 defective.
\
YES
YES
IClOl (CLW) Pin@ input?
(2M) I
YES
NO
R93 pattern defective. w IC9 Pin@ output check?
I I
YES +
+ NO
21
.I
3-2 PICTURE DEFECTIVE
I
, ? 4
ICI 01 (CL484) Pin @m input? NO Xl 11 Pin@)defective.
(me L:O.K, H:NG) lIClll Pin@ defective.
w I . ,
YES
ICl Pin@, @, @ output check? NO ++I
(1 v P-P)
, I
YES
1
ICl Pin @, @I,`@ (R.G.B CLK) check?
(13.5MHz)
I
YES
1
IC2 Pin@ input (VS+HS) check? r
YES
\
IC2 Pin@ cvout check? (2 V p-p) No ,IIC2defective
\
YES
IC5 Pina output check?
, I
YES
I
IC12 Pin@, @ check?
0 1 v P-P
0 2v P-P
YES
c
AV Jack defective.
22
3-3 . COLOR DEFECTIVE
IC2 Pin@ SCIN check? NO .
NO lIC5 defective.
w IC3 Pin@ check?
(4.433619MHz t200Hz) lIC3 defective.
l S.C surrounding
IC5
YES
I circuitry defective.
R5 defective.
YES Ir
IcllPin@(Hs)Pi@(vs)chw?
1234567 lIC11 delay RC surrounding
circuitry defective.
IIC2 defective. I
23
3-4-1.
S/I Defective
I-- IC13 Pin@= output?
NO
I I
NO IC8 PinQ output?
IC7 Pin@ VS check?
w (2 VP-P)
I I
-
YES $
ICI02 (H8) Pin@ check? NO
m IC102 (H8) Pin@ patternopen.
5V f m (50Hz) '
r
I
ICI 11 Pin@)check? NO l IC102 (H8) defective.
b l IC111defective.
FMF r
7
YES
ICI5 Pin@ input check?
ICI5 Pin@ pattern open.
(Pin@ LOW- OK)
ICI5 Pir@ input? 4C15 defective.
(0.K) ki r (NG)
4C16 defective.
24
3-4-2. FONT DEFECTIVE
I
\ I
IC14 Pin@ output check?
/ NO
w IC14 Pin@ input Check?
I b
YES + YES +
. 4
NO l 5 defective.
IC1
IC15 Pin@ output? r
c
I
YES + YES +
. I
NO
IC16 Pin@ output? v m l 6 defective.
ICl '
YES +
\
IC5 Pina (BO) input? NO
w R85 defective.
U-LLL
IC16 Pin@ input? IC16 Pin@ pattern defective.
YES $
OK
-
25
3-4-3. FONT VIBRATION
IC7 Pin@ output check? NO 4C7 R.C surrounding circuitry
b defective.
.* v
ICI 3 Pin@ VS output? NO 4C13 defective.
(VS50Hz) w 4C13 delay R.C circuitry
I
defective.
26
3-4-4. FONT COLOR DEFECTIVE
I
IC6 Pin@ input? NO
w Q3 defective.
(l-2 v P-P)
IC6 Pina input? A+PIdefective.
-
YES 1
1
IC6 Pin@ check? NO 0x3 defective
D (4.433619MHz+200Hz)
l R42, C59 defective.
-+ 64~s"I
.
YES +
.
IC14 Pin@, 8, @ check? NO
w IC14 defective.
@, 8 M.rL~5" @ JmJI;o.w
,
R18 defective.
27
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