Sharp PN-K321 (serv.man3) Service Manual ▷ View online
PN-K321/K322B TROUBLESHOOTING 7 - 4
6. THE RED LED BLINKS
7. THE LED LIGHTS UP IN ORDER OF RED -> GREEN -> RED -> GREEN
(TEMPERATURE ERROR)
:’13/Dec
Display check result with particular operation or by the
execution of particular RS232C command to specify the
error position.
execution of particular RS232C command to specify the
error position.
Error position
confirmed.
Is there any abnormality in the error position?
Such as:
- Power failure
- Blown fuses F101 / F102
Such as:
- Power failure
- Blown fuses F101 / F102
䚷
No error position confirmed.
- Connection cable failure
Abnormality found.
Check the DC-DC PWB unit for any abnormality.
Replace DC-DC PWB unit.
䚷
No abnormality found.
Abnormality found.
Check the LED driver PWB unit for any abnormality
Replace LED driver PWB unit.
䚷
No abnormality found.
Check the Switch PWB and the related parts listed below
for any abnormality
for any abnormality
Abnormality found.
- Connection cable
Replace the abnormal part.
- Switch PWB
Replace the Switch PWB.
䚷
No abnormality found.
- Check the Main I/F PWB and the related parts listed
below for any abnormality:
below for any abnormality:
Abnormality found.
- Connection cable
Replace the abnormal part.
- Main I/F PWB
Replace the Main I/F PWB.
No
Is the unit properly installed under proper environment?
Check the installation requirements.
䚷
Yes
Yes
Is the vent blocked?
Remove the obstacles.
䚷
No
Display check result with particular operation or by the
execution of particular RS232C command to specify the
error position.
execution of particular RS232C command to specify the
error position.
Error position
confirmed.
Is there any abnormality in the error position?
䚷
Yes
䚷
No error position confirmed.
Replace the abnormal part.
Replace the Main I/F PWB.
Replace the Main I/F PWB.
Check the Key PWB and the related parts listed below for
any abnormality
any abnormality
Abnormality found.
- Connection cable
Replace the abnormal part.
- Key PWB
Replace the Switch I/F PWB.
䚷
No abnormality found.
Check the Main I/F PWB and the related parts listed below
for any abnormality:
for any abnormality:
Abnormality found.
- Connection cable
Replace the abnormal part.
- PWB
Replace the Main I/F PWB.
*1䚷Implementing countermeasure to defective parts
1: Input of 12V-voltage to the panel
2: Input of 24V-DC
3: Input of 12V-voltage to the speaker
4: Input of 5V-voltage to the Main power supply unit
2: Input of 24V-DC
3: Input of 12V-voltage to the speaker
4: Input of 5V-voltage to the Main power supply unit
Backlight:LED error
PN-K321/K322B TROUBLESHOOTING 7 - 5
8. Implementing countermeasure to defective parts
■Input of 12V-voltage to the panel
■Input of 24V-DC
■Input of 12V-voltage to the speaker
■Input of 5V-voltage to the Main power supply unit
■Backlight (LED error)
:’13/Dec
Yes
Is approx. 12 V-voltage input to the 14th pin on IC2500 14th
pin?
pin?
R3224 or R3225 or IC2500 may have defect.
Replace the abnormal part.
Replace the abnormal part.
䚷
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
NOT LIGHT UP)".
Is approx. 19.5 V-voltage input to the IC2500 15th pin ?
R3200 or R3201 or IC2500 may have defect.
Replace the abnormal part.
Replace the abnormal part.
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
NOT LIGHT UP)".
Yes
No
Yes
Is approx. 12 V-voltage input from the connector to the 9th
pin on IC2500?
pin on IC2500?
R3200 or R3201 or IC2500 may have defect.
Replace the abnormal part.
Replace the abnormal part.
䚷
No
Yes
Is the F3200 blown out?
Replace F3200.
䚷
No
Yes
Disconnect the harness and see if approx. 12 V-voltage is
input to the connector (CN3200) 11th pin on Main power
supply unit.
input to the connector (CN3200) 11th pin on Main power
supply unit.
Replace the Main I/F PWB.
䚷
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
NOT LIGHT UP)".
Yes
Is approx. 5 V-voltage input from the connector to 9th pin on
IC2500?
IC2500?
R3204 or R3205 or IC2500 may have defect.
Replace the abnormal part.
Replace the abnormal part.
䚷
No
Yes
Is the F3200 blown out?
Replace F3201.
No
Yes
Disconnect the harness and see if approx. 5 V-voltage is
input to the connector (CN3200) 8th and 9th pin on Main
power supply unit.
input to the connector (CN3200) 8th and 9th pin on Main
power supply unit.
Replace the Main I/F PWB.
䚷
No
See "1 THE POWER IS NOT SUPPLIED (THE LED DOES
NOT LIGHT UP)".
NOT LIGHT UP)".
Yes
Yes
Does the backlight light up?
Is there any ununiformity in brightness toward
vertical direction?
vertical direction?
Replace LED power unit.
䚷
No
Defect found.
䚷
No
Any defect with cable?
Replace the abnormal part.
䚷
No defect found.
Replace the LCD module.
Yes
Check the log data and specify the type of error.
Replace LED driver PWB unit.
䚷
Is it Open error?
䚷
No
Yes
Yes
Check the log data and specify the type of error.
Any problem with installation environment?
Replace LED driver PWB unit.
䚷
Is it thermal shutdown?
䚷
No
䚷
No
Ensure a good installation environment.
Replace LED driver PWB unit.
PN-K321/K322B HARDWARE DESCRIPTIONS
8 - 1
CHAPTER 8. HARDWARE DESCRIPTIONS
1. CIRCUIT DESCRIPTIONS
1. CIRCUIT DESCRIPTIONS
1-1. SYSTEM COMPONENT
・
This machine realizes the super high-definition monitor (resolution 3840x2160(QFHD)).
・
This machine adopts IGZO/IPS panel whose screen size is
32" Class (31-35/64 inch (80.1cm) diagonal).
・
It is possible to adjust the color by OSD and the adjustment values are saved in the embedded EEPROM.
・
The input interface is composed of Displayport, HDMI, the audio stereo jack and RS-232C stereo jack. And, the output interface has one
audio stereo jack.
・
This machine adopts the LED backlights and realize the thinner monitor.
1-2. UNIT COMPOSITION
The display is composed of the LCD unit (including the LCD-TCON, LED PWB x4), the LED Driver PWB, the LED PWB x4, the main PWB,
the key PWB, the LED indicator PWB, the thermistor PWB, the DC-DC PWBN and the AC adaptor.
1-3. LCD UNIT
No Item
PN-K321/321H
PN-K322B
1 Screen
size
(Diagonal)
32" Class [31-35/64 inch (80.1cm) diagonal] TFT LCD
2
Max. resolution
3,840
x
2,160
3
Max. colors
Approx. 1.06 billion colors
4
Pixel pitch
140ppi
5 Max.
brightness 350cd/㎡ 300cd/㎡
6
Video color system
NTSC 72%
7 Contrast
ratio
3,000：1
8
Viewing angle
176°up/down, 176°right/left
≧
(CR 10)
9
Backlight
LED backlight (Top/Bottom edge)
10
Backlight life
50,000(landscape, horizontal installation)
11 Screen
uniformity 80%
12
USB
---
Touch panel only (miniB terminal)
(Firmware rewrite only pin × 1)
13
Touch panel
---
Capacitive touch panel (10 point touch)
:’13/Dec
PN-K321/K322B HARDWARE DESCRIPTIONS
8 - 2
1-4．I/F PWB Unit
■ OPERATIONAL DESWCRIPTION
・
Regarding the video signal, it is possible to receive DisplayPort signal and HDMI signal.
・
DisplayPort signal is input from CN201.
・
HDMI signal is input from CN302 or CN1401. Or, HDMI signal is input from both CN302 and CN1401.
・
The input video signal is handled by STDP9320 x 2（IC200,IC1400, is transferred into LVDS signal and is output to from CN901 to
CN2202.
・
The audio signal is input from the line input of CN801 or the audio signal mixed with DisplayPort signal or HDMI signal. These signals
are handled by STDP9320 (IC200) and activated by the audio amplifier (CN702).
・
The audio signal is output from the audio amplifier (IC702) to Headphone terminal (CN701) or the embedded speakerterminal (CN702).
・
The control and OSD of USB, RS-232C, keys, LED, photo sensors and thermistor are handled by ARM microcomputer (IC2500) and
CPLD(IC2400).
・
The power is input from the power connector (CN3200) of DC-DC PWB. Then, the voltage is generated on DC/DC block of PWB and
supplied to ICs of each block of PWB.
・
The sequence control of the power for each block is controlled by CPLD (IC2400).
■ MAJOR COMPONENT PARTS AND THEIR FUNCTIONS
No Description
IC701
Audio amplifier This activates the headphone or the speaker by receiving I2C audio signal from IC200.
IC802
DSP for sampling the audio : This samples the analog signal by the line input and transfers the analog signal to the
digital signal. The transferred signal is sent to IC200 by I2C.
IC501
Port processor of HDM This receives the signals from two HDMI connectors and handles and sends them to
IC200 and IC1400. Or, this sends signals of two HDMI connectors to IC200 and IC1400.
IC200
Scaler IC chip : This receives DP signal or HDMI signal, scales or handles by double speed and output the left half
part of QFDH (Quad Full High Definition). The video output format is 960 x 2160. When these ICs input DP
signals, these ICs receive QFDH signal and send it to IC1400. At this moment, this reads the data of left half part
of the monitor and displays the data. When these ICs input 30Hz HDMI signals, these reads the data of all part
of the monitor. When these ICs input 60Hz HDMI signals, these reads the data of half part of the monitor. Then,
displays the data.
IC401,IC402
Frame memory of IC200 operation
IC1400
Scaler IC chip : This receives DP signal or HDMI signal, scales or handles by double speed and output the left half
part of QFDH (Quad Full High Definition). The video output format is 960 x 2160. When these ICs input DP
signals, these ICs receive QFDH signal and display only right half part of the monitor. When these ICs input 30Hz
HDMI signals, these reads the data of all part of the monitor. When these ICs input 60Hz HDMI signals, these
reads the data of half part of the monitor. Then, displays the data.
IC2101,IC2102
Frame memory of IC1400 operation
IC2400
CPLD This controls the sequence of starting up the power, the power of each part of the machine or each IC.
IC2500
Controls the arm microcomputer and the whole system.
:’13/Dec
:’14/Jan
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