Sharp XV-Z21000 (serv.man3) Service Manual ▷ View online
XV-Z20000/XV-Z21000/DT-5000
5 – 1
XV-Z20000
Service Manual
CHAPTER 5.
TROUBLE SHOOTING TABLE
[1] TROUBLE SHOOTING TABLE
Checking the basic performance
Is the POWER LED on or flickering in red or
blue?
blue?
NO
Go to "Checking the power unit"
YES
Is the set turned on by the set's or remote
controller's power key?
controller's power key?
NO
Go to "Checking the microcomputer
peripherals"
peripherals"
YES
Is the cooling fan running? Is the lamp on?
NO
Go to "Checking the lamp light-up".
YES
Is the user menu displayed?
NO
Check the formatter circuit's peripheral circuits
and go to “checking the PC PWB”
and go to “checking the PC PWB”
YES
Is the video input (VIDEO, S-VIDEO) as
specified?
specified?
NO
Are there output signals at TL3053, TL3504,
TL3517?
TL3517?
NO
Check the Q2501,
Q2502, Q2504 and their
peripheral circuits.
Q2502, Q2504 and their
peripheral circuits.
YES
YES
Go to “checking the PC PWB”
Is the component input (C1, C2) as speci-
fied?
fied?
NO
Are there output signals at TL3506, TL3508,
TL3512?
TL3512?
NO
Check the IC2501,
IC2502 and their periph-
eral circuits.
IC2502 and their periph-
eral circuits.
YES
YES
Check the PC board circuit's peripheral circuits.
Is the RGB input (DVI) as specified?
NO
Check the PC board circuit's peripheral circuits.
YES
Does the RS-232C interface function?
NO
Are there output signals at every other pin from
pins (10) to (40) of P3580?
pins (10) to (40) of P3580?
NO
Check the IC2001 circuit
and its peripheral cir-
cuits.
and its peripheral cir-
cuits.
YES
YES
Check the IC5003 on the PC PWB
Recommended
communication software: "TERA TERM"
Make the following settings: baud rate at
9600 bps, bit length at 8 bits, stop bit at 1 bit
and no parity. Press the RETURN key on the
keyboard. Does "ERR" show up again?
communication software: "TERA TERM"
Make the following settings: baud rate at
9600 bps, bit length at 8 bits, stop bit at 1 bit
and no parity. Press the RETURN key on the
keyboard. Does "ERR" show up again?
NO
Check the IC5003 on the PC PWB
YES
END
XV-Z20000/XV-Z21000/DT-5000
5 – 2
Checking the power unit
Are all the connectors inside the
power unit tightly connected?
power unit tightly connected?
NO
Insert the connectors P702, P704, CN90
and P703 tightly.
and P703 tightly.
YES
Is the lamp cover closed completely?
NO
Tighten up the lamp door closed with the
screws.
screws.
YES
Is the bimetal switch off?
NO
Replace the bimetal switch or press the
red button to reset.
red button to reset.
YES
Is AC voltage applied across the
RY701 relay?
RY701 relay?
NO
Replace F701.
YES
Is AC voltage applied across L706?
NO
Replace F702.
YES
Is there DC voltage of about 6 V
across C723?
across C723?
NO
Check the T701, L705, R706, R718.
Replace any of them as required.
Replace any of them as required.
YES
Is a voltage of DC370V applied to
C737 and C740?
C737 and C740?
NO
Check the circuits leading to the primary
side of T704 for damage.
Replace any of them as required.
side of T704 for damage.
Replace any of them as required.
YES
Is there the specified voltage at the
output terminal of P704?
output terminal of P704?
NO
Check the circuits leading to the second-
ary side of T704 for damage.
Replace any of them as required.
ary side of T704 for damage.
Replace any of them as required.
YES
Check the output PWB.
XV-Z20000/XV-Z21000/DT-5000
5 – 3
Check of the microprocessor's
peripheral circuits
peripheral circuits
The power indicator does not light
up?
up?
YES
Check the power supply BU6V system
and output voltage of IC2810 and IC2002.
Check peripheral circuits of IC2005.
and output voltage of IC2810 and IC2002.
Check peripheral circuits of IC2005.
NO
When connecting to an AC outlet, the
power indicator lights red for a
moment and flashes red at 1-second
intervals?
power indicator lights red for a
moment and flashes red at 1-second
intervals?
YES
Check the lamp door and lamp switch. Try
to press the red button of bimetal SW.
Check each output of power supply.
to press the red button of bimetal SW.
Check each output of power supply.
NO
The power indicator flashes red at 4-
second intervals?
second intervals?
NO
Go to “Check of lamp lighting”.
YES
Check the voltage of TL6503 on the
PC board unit.
Is it 3V or more?
PC board unit.
Is it 3V or more?
NO
Check the output voltage of DCDC regula-
tor IC on the main unit and PC board unit.
tor IC on the main unit and PC board unit.
YES
Is clock output to TL5015 on the PC
board unit?
board unit?
NO
Are X5001 (16.59 MHz) and X5002
(32.768 MHz) oscillated?
Or check peripheral circuits of IC5003.
(32.768 MHz) oscillated?
Or check peripheral circuits of IC5003.
YES
Is pulse output to TL5009 when con-
necting to an AC outlet?
necting to an AC outlet?
NO
Check peripheral circuits of IC2005.
YES
Check peripheral circuits of IC5003,
IC5101 and IC5104.
IC5101 and IC5104.
Check of lamp lighting
The lamp indicator lights blue and goes out in
about 15 seconds. The power indicator flashes
red at 1-second intervals.
about 15 seconds. The power indicator flashes
red at 1-second intervals.
YES
Check the 13 V power supply and the
cooling fan drive circuit.
cooling fan drive circuit.
NO
The lamp flashes blue, but it lights solid red after
about one minute.
about one minute.
YES
The lamp or the ballast unit is defective.
NO
The lamp lights up. After about 100 seconds, the
TEMP warning indicator appears on the screen,
and the unit enters the stand-by. (The power indi-
cator and temperature monitor indicator flash red.)
TEMP warning indicator appears on the screen,
and the unit enters the stand-by. (The power indi-
cator and temperature monitor indicator flash red.)
YES
If TEMP error occurs even at low ambient
temperatures, check the TEMP1 and
TEMP3 signal lines. Check the fan.
temperatures, check the TEMP1 and
TEMP3 signal lines. Check the fan.
NO
Go to "The lamp is flashing blue continuously".
XV-Z20000/XV-Z21000/DT-5000
5 – 4
The lamp is flashing blue continu-
ously.
ously.
Is a voltage of 2.5 V or more present
at pins TL6610 in the PC PWB unit?
at pins TL6610 in the PC PWB unit?
NO
Check IC2005 (sub-microcomputer) and
peripheral parts.
peripheral parts.
YES
Is a voltage of 3 V or more present at
TL6611 in the PC PWB unit?
TL6611 in the PC PWB unit?
YES
Check IC2005 (sub-microcomputer) and
peripheral parts.
peripheral parts.
NO
Are a 1 Vp-p clock signals present at
R8731, R8732 in the formatter unit?
R8731, R8732 in the formatter unit?
NO
Check X8701, Check the peripheral cir-
cuits of IC8711 and IC8712.
cuits of IC8711 and IC8712.
YES
Is power output of IC9701 and
IC9702 normal? (1.8V/1.2V/2.5V/
3.3V)
IC9702 normal? (1.8V/1.2V/2.5V/
3.3V)
NO
Check peripheral circuits of IC9701 and
IC9702.
IC9702.
YES
Is a pulse present at each address
pin of IC8602 and IC9602 in the for-
matter unit, immediately after turning
the power on?
pin of IC8602 and IC9602 in the for-
matter unit, immediately after turning
the power on?
NO
IC9101 is defective.
YES
Is a pulse being output to each data
pin of IC8602 and IC9602 in the for-
matter unit, immediately after turning
the power on?
pin of IC8602 and IC9602 in the for-
matter unit, immediately after turning
the power on?
NO
IC8602 or IC9602 is defective.
YES
Are IC8602 and IC9702 warm when
touching them?
touching them?
NO
Check IC8301 and IC9301 and peripheral
circuits of IC8601 and IC9601.
circuits of IC8601 and IC9601.
YES
Is a motor drive pulse present at pins
(2), (3), and (4) of P9701 in the for-
matter unit?
(2), (3), and (4) of P9701 in the for-
matter unit?
NO
Check IC9701 and its peripheral circuits.
YES
Is a pulse present at pin (4) of P8901
in the formatter unit?
in the formatter unit?
NO
The color wheel unit is defective.
YES
IC8301 or IC9301 is defective.