6-19
6-19 E
3. Specific item failed in Diag All Check
A mounting failure of IC or faulty IC for that item is doubtful.
If “1901NG” is displayed, a loose connection of CN801, mount-
ing failure of AUDIO DSP (IC701), or faulty IC is doubtful.
4. Picture and sound are not outputted
Check the CN801 for connection, and the flat cable for damage or
loose connection.
5. Picture is outputted, but sound is not outputted
A mounting failure of AUDIO DSP (IC801) or AUDIO DAC
(IC802, IC803), power supply failure, or faulty IC is doubtful.
6. Sound is outputted, but picture is not outputted
Using an oscilloscope, measure the
yd
,
yh
,
yl
,
uf
,
uj
, and
i;
pins of AVD (IC503) to check if analog signals are outputted re-
spectively. If not outputted, a soldering failure of that line, a short
with other line, missing capacitor or resistor, or faulty AVD is
doubtful.
6-11-3. Drive Auto Adjustment stops by an error
Faulty analog circuits of ARP&SERVO (IC302) or faulty periph-
eral circuits of DIGITAL SERVO (IC202) on the MB-98 board,
faulty optical pickup, or loose connection of flat cable is doubtful.
6-11-4. Power is Supplied but Unstable
If Syscon Diagnosis completed successfully, basically the boards
other than MB-98 board, connection, optical pickup, or mechani-
cal deck will be faulty.
1. Red LED does not light when AC is supplied
Check if the specified voltage is outputted from the EVER
–
11 V
(
3
pin), EVER +3.3 V (
qa
pin), and EVER +11 V (
qd
pin) of
CN201 or CN920 in the power supply block. If not outputted, the
power supply block will be faulty.
2. At
[POWER]
button ON, LED does not light in green
even once, but kept in red (standby state)
Check if the specified voltage is outputted from the EVER
–
11 V
(
3
pin), EVER +3.3 V (
qa
pin), and EVER +11 V (
qd
pin) of
CN201 or CN920 in the power supply block. If not outputted, the
power supply block will be faulty.
Check the P-CONT (
2
pin) of CN401 on the IF-80 board if it
becomes “H”. If not “H”, a soldering failure of that line, a short
with other line, missing capacitor or resistor, faulty AVD (IC503),
loose connection between power supply block and IF-80 board,
loose connection of connectors, faulty power supply block, or faulty
IF-80 board is doubtful.
button ON, LED lights in green but
returns to red (standby state) after several seconds
(e.g. it returns to standby state after “SONY DVD”
was displayed)
There is no regularity between faulty parts and timing when the
set returns to the standby state).
Check if the specified voltage is outputted from the power supply
block. If not outputted, the power supply block will be faulty.
Check the XFRRST (
9
pin) of CN101 on the MB-98 board if it is
fixed to “L”, or the XIBUSY (
0
pin), XIFCS (
qa
pin), SI0 (
qs
pin), SO0 (
qd
pin) and SC0 (
qf
pin) of CN101 if they are fixed to
“L” or “H”.
If fixed to “L” or “H”, a soldering failure of that line, a short with
other line, missing capacitor or resistor, or faulty AVD (IC503) is
doubtful.
If not fixed to “L” or “H”, loose connection between power sup-
ply block and IF-80 board or between IF-80 board and MB-98
board, loose connection of connectors, or faulty IF-80 board is
doubtful.
4. At
[POWER]
button ON, LED lights in green but
fluorescent display tube does not light
Loose connection between power supply block and IF-80 board,
loose connection of connectors, or faulty IF-80board is doubtful.
5. Picture and sound are not outputted
Loose connection between power supply block and IF-80 board
or between IF-80 and AV-56 board or between AV-56 board and
MB-98 board, loose connection of connectors, or faulty AV-56
board is doubtful.
6. Picture is out outputted correctly
A mounting failure of BNR (IC601) on the MB-98 board, or faulty
AVD (IC503) or ARP&SERVO (IC302), or faulty 27 MHz output
(frequency, waveform) from 27-1OUT (
3
pin) of PLL (IC102) is
doubtful.
6-11-5. Power is not Supplied
1. Red LED does not light when AC is supplied
The power (EVER +3.3 V) is not supplied to the IF CON (IC404)
on the IF-80 board.
The X401 does not oscillate.
2. At
[POWER]
button ON, LED is kept in red
(standby state)
Any button has been pressed.
The voltage at PONCHK (
e;
pin) of the IF CON (IC404) on the
IF-80 board exceeds 0.5 V.
3. At
[POWER]
button ON, LED lights in green but
returns to red (standby state) after several seconds
The PONCHK (
e;
pin) of the IF CON (IC404) on the IF-80 board
is abnormal (slow rising from 0.5 V to more than 1.5 V, or voltage
not rising to more than 1.5 V).
The SYSTEM CONTROL (IC103) on the MB-98 board is faulty.
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