Sharp CX-51G3 - Troubleshooting Table: No Raster; Troubleshooting Table: No Picture, No Sound; Troubleshooting Table: No Sound

TROUBLE SHOOTING TABLE
TROUBLE SHOOTING TABLE (Continued)
NO RASTER
I
Check F701.
t I
Blown out.
I
Replace the fuse.
I
1 Abnormal 1
I
Check pin (1) of T701 voltage
(Approx. 31 OV at 220V AC)
I I
The fuse is again blown out.
I
I
Check R701, R702 and
I
;
I
D709.
---------------I
Check Secondary Main+B
(Approx. 115V)
I
Normal
i-i
___--------_
‘-i
Abnormal
ir’
Normal
1 Check C707, D701,0702, ;
1 D703 and 0704.
--------------_I
1 Check D7Or3 and 0732. 1 ( E!trF k!L connecto,r lzl ~~~~~~Power LED Green) 1
L
NO
y [T 1 Abnbrmal)
~---___, r-------
I
I
Check R609 and R611.
{
I _-------------
-I
oscillate ?
NO
YES
r
I
Does horizontal circuit
I+
Bus error
mode.
See Fig. 1
or Check
IC602.
Checking the
protector circuit
(The protector
circuit still works
even if there is no
vertical waveform
at pin (2) of IClOOl
r- ------ ‘--------
I
I
Check Q1005, Q1006,
!
I
IC603 and IC801.
---------,----J
If a bus error happens, the LED RED (pin 3) indicator starts flashing and the power
is turned off. The power key is still effective.
IC1003
Fig. 1 EEPROM (ST24C02) 1
IC801
V/C/J
(TB1226CN) -
TU201
PLL
(CXA3134) 6
uu
2s 0.5s
17-1
CIRCUITS TO BE CHECKED:
l Tuner.
NO PICTURE, NO SOUN
l PIF.
l Automatic Gain Control.
l (W), (9V) Power Source.
Does the noise level increase at max.
received.
No snow noise.
I
Jr
Check the tuner supply voltage MB
must be approx, 9V. BP must approx.
5V. BT must be approx 31V, and
channel preset data check.
1
I
Normal 1
+
1
Check the tuner AGC.
1
I
I
Normal
1
+
1 Abnormal [
+
Dose noise or signal appear at pin (21)
of IC201 ?
YES
Do noise or signal
appear at pin (1)
I and its related
I
of IC801 ?
1 parts.
I
r----------l
I
I
Check IC801.
I ( CheckANsw 1
I
I 1 circuits (IC401). I
I
__--------
I l----------l
------l--------L-----,
I Check the tuner i I
I
I circuit.
I l
Check IC201. i
I
------m-e-
t l------,---l
CIRCUITS TO BE CHECKED:
l SIF Amplifier Circuit.
l Sound Detector Circuit.
:
I ---------------1
(
r--------------_
Does signal appear at pins
NO
(1) and (8) of IC302 ?
+
r_--____--------
Does signal appear at pin
NO
I Check IC302 and peripheral r
(3) of IC351 ?
h circuit.
I
I ---------------I
YES
r--------------_
; Check (5) connector IC351 ;
, and peripheral circuit.
---------------I
17-2