Nec Multisync fp1355 fp1355 fp1355 User manual

SERVICE MANUAL

HIGH RESOLUTION DISPLAY MONITOR

FP1355

(NSZ2102STTUW)

NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS CORPORATION

MAY 2001

CBB-S5737

X-RADIATION WARNING

The surface of pucture tube may generate X-Radiation.

Precaution during servicing, and if possible use of a lead apron or metal

for shielding is recommended. To avoid possible exposure to X-Radiation

and electrical shock hazard, the high voltage compartment and the picture

tube shield must be kept in place whenever the chassis is in operation.

When replacing picture tube use only designated replacement part since

it is a critical component with regard to X-Radiation as noted above.

CRITICAL COMPONENT WARNING

• In the schematic diagram/parts list, the components marked " " are

critical components for X-ray radiation.

When replacing these parts, use exactly the same one indication in

parts list.

• If one or some of the components listed below are replaced, the high

voltage and the operating voltage of high voltage hold-down circuit must

be re-adjusted according to Clause 2.4 ADJUSTMENT on page 2-6 :

T701, IC101, IC103, R708, R709

iii

Contents

1. Circuit description ...................................................................................................................... 1-1

1.1 Power block ......................................................................................................................... 1-1

1.1.1 Outline ...................................................................................................................... 1-1

1.1.2 Rectifying circuit ....................................................................................................... 1-1

1.1.3 Surge current suppression ...................................................................................... 1-1

1.1.4 Higher harmonic circuit............................................................................................ 1-2

1.1.5 Sub power circuit ...................................................................................................... 1-4

1.1.6 Main power circuit..................................................................................................... 1-4

1.1.7 Degaussing circuit .................................................................................................... 1-7

1.1.8 Power management circuit...................................................................................... 1-7

1.1.9 Protective circuit ....................................................................................................... 1-7

1.2 Horizontal deflection block ................................................................................................ 1-12

1.2.1 Distortion compensation waveform generating circuit........................................ 1-13

1.2.2 Deflection current compensation circuit................................................................ 1-22

1.3 Vertical output block........................................................................................................... 1-24

1.4 High voltage block .............................................................................................................. 1-25

1.4.1 High voltage control circuit...................................................................................... 1-25

1.4.2 Protective function circuit........................................................................................ 1-25

1.4.3 DBF (Dynamic Beam Focus) circuit....................................................................... 1-27

1.5 CRT compensation block................................................................................................... 1-29

1.5.1 Rotation circuit .......................................................................................................... 1-29

1.5.2 Corner purity circuit.................................................................................................. 1-29

1.5.3 Earth magnetism cancel circuit .............................................................................. 1-30

1.5.4 Digital dynamic convergence clear (DDCC) circuit ............................................. 1-31

1.6 Control block........................................................................................................................ 1-38

1.6.1 Sync. signal process ................................................................................................ 1-38

1.6.2 Front button ............................................................................................................... 1-38

1.6.3 I2C bus control.......................................................................................................... 1-38

1.6.4 Power control ............................................................................................................ 1-38

1.6.5 ABL, Beam protector................................................................................................ 1-39

1.6.6 CRT support .............................................................................................................. 1-39

1.6.7 High voltage control ................................................................................................. 1-39

1.6.8 Display Data Channel .............................................................................................. 1-40

1.6.9 LED ............................................................................................................................. 1-40

1.6.10 Clamp pulse............................................................................................................. 1-41

1.6.11 SPARK...................................................................................................................... 1-41

1.6.12 Avoidance operation during input SYNC switching ........................................... 1-41

1.6.13 CS switch and vertical linearity switch............................................................... 1-41

1.6.14 H/W RESET ............................................................................................................. 1-41

1.6.15 Oscillation circuit..................................................................................................... 1-42

1.7 Software................................................................................................................................ 1-42

1.7.1 Outline ...................................................................................................................... 1-42

1.7.2 Frequency variation detection function ................................................................. 1-42

1.7.3 Memory of user timing ............................................................................................. 1-42

1.7.4 Picture adjustment.................................................................................................... 1-43

1.7.5 Power management.................................................................................................. 1-43

1.7.6 LED display................................................................................................................ 1-44

1.7.7 Status memory to EEPROM.................................................................................... 1-44

1.8 Deflection processor block ................................................................................................ 1-45

1.8.1 Outline ...................................................................................................................... 1-45

1.8.2 Vertical deflection waveform generating circuit................................................... 1-45

1.8.3 Horizontal deflection drive waveform generating circuit..................................... 1-46

1.8.4 Distortion compensation waveform generating circuit ........................................ 1-46

1.8.5 DBF compensation waveform generating circuit ................................................. 1-46

1.8.6 Convergence compensation waveform generating circuit.................................. 1-47

1.8.7 Blanking waveform generating circuit.................................................................... 1-47

1.8.8 Moire canceling circuit ............................................................................................. 1-47

1.8.9 Distortion compensating operation ........................................................................ 1-49

1.9 Video block .......................................................................................................................... 1-50

1.9.1 Picture signal amplifier circuit ................................................................................ 1-50

1.9.2 Cut-off circuit............................................................................................................. 1-50

1.9.3 2-input change over circuit and synchronizing signal circuit............................. 1-53

1.9.4 On Screen Display circuit........................................................................................ 1-55

1.9.5 AUTO-SIZE function................................................................................................. 1-56

1.10 USB circuit ......................................................................................................................... 1-58

1.10.1 Outline ...................................................................................................................... 1-58

1.10.2 USB downstream power supply............................................................................ 1-58

1.10.3 HUB controller power output................................................................................. 1-58

1.11 Wave form of main circuit voltage.................................................................................. 1-59

2. Adjustment procedure ............................................................................................................... 2-1

2.1 Measuring instruments....................................................................................................... 2-1

2.2 Preparatory inspections..................................................................................................... 2-1

2.3 Names of each monitor part.............................................................................................. 2-2

2.3.1 Configuration of front control panel ....................................................................... 2-2

2.3.2 Configuration of rear input connector.................................................................... 2-2

2.3.3 OSD display matrix................................................................................................... 2-3

2.3.3.1 User mode ................................................................................................... 2-3

2.3.3.2 Factory mode .............................................................................................. 2-4

2.4 Adjustment ........................................................................................................................... 2-6

2.4.1 How to select the factory adjustment (FACTORY) mode................................... 2-6

2.4.1.1 Selecting with front panel switches ......................................................... 2-6

2.4.2 Adjustments before aging........................................................................................ 2-6

2.4.2.1 Adjusting the high voltage and high voltage protector ......................... 2-6

2.4.2.2 SCREEN voltage / FOCUS adjustment................................................... 2-6

2.4.2.3 Shock test.................................................................................................... 2-6

2.4.2.4 Preadjustment before aging...................................................................... 2-7

2.4.2.5 Adjusting the landing ................................................................................. 2-7

2.4.3 Adjustments after aging........................................................................................... 2-7

2.4.3.1 +B adjustment............................................................................................. 2-7

2.4.4 Adjusting the picture size, position and distortion .......................................................... 2-7

2.4.4.1 Adjusting the picture inclination............................................................... 2-8

2.4.4.2 Adjusting the back raster position ........................................................... 2-8

2.4.4.3 Adjusting the left/right distortion, picture width, picture position

(H-PHASE) and vertical linearity (all preset) ......................................... 2-8

2.4.4.4 Adjusting the DBF amplitude and phase ................................................ 2-9

2.4.5 Adjusting the cut off ................................................................................................. 2-10

2.4.6 Adjusting the RGB drive signal and X-Pro............................................................ 2-13

2.4.6.1 Adjusting the R, G, B drive signal (Adjustment of COLOR 1) ............. 2-13

2.4.6.2 Adjusting ABL.............................................................................................. 2-13

2.4.6.3 Adjustment of X-Pro (Timing No.A 30k / 70Hz Full white)................... 2-14

2.4.6.4 Confirmation for operation of X-Pro .............................................................. 2-14

2.4.7 Adjusting the Purity .................................................................................................. 2-14

2.4.8 Adjusting the focus................................................................................................... 2-15

2.4.9 Adjusting the convergence...................................................................................... 2-16

2.4.9.1 Adjusting with ITC ...................................................................................... 2-16

2.4.9.2 Adjusting DDCP.......................................................................................... 2-18

2.4.10 Default settings (With factory mode) ................................................................... 2-23

2.5 Inspections (In normal mode) ........................................................................................... 2-24

2.5.1Electrical performance .............................................................................................. 2-24

2.5.1.1 Withstand voltage....................................................................................... 2-24

2.5.1.2 Grounding conductivity check .................................................................. 2-24

2.5.1.3 Degaussing coil operation......................................................................... 2-24

2.5.1.4 IPM (POWER SAVE) function operation................................................. 2-24

2.5.1.5 Confirming the GLOBAL SYNC function................................................. 2-25

2.5.1.6 Focus, picture performance...................................................................... 2-25

2.5.1.7 Misconvergence.......................................................................................... 2-25

2.5.1.8 Picture distortion ........................................................................................ 2-26

2.5.1.9 Linearity ..................................................................................................... 2-28

2.5.1.10 Adjustment value list................................................................................ 2-29

2.5.1.11 Confirming EDGE LOCK, SYNC ON GREEN....................................... 2-29

2.5.1.12 Checking the functions during Composite Sync input........................ 2-29

2.5.1.13 Confirming the full white luminance ...................................................... 2-30

2.5.1.14 Confirming CONVERGENCE compensation function......................... 2-30

2.5.1.15 Confirming ROTATION compensation function ................................... 2-30

2.5.1.16 Luminance/color coordination uniformity.............................................. 2-30

2.5.1.17 Confirming the full white color coordination......................................... 2-30

2.5.1.18 Confirming the color tracking ................................................................. 2-31

2.5.1.19 CRT installation position ......................................................................... 2-31

2.5.1.20 Confirming FPM operation ...................................................................... 2-31

2.5.1.21 Confirming AUTO ADJUST operation ................................................... 2-31

2.5.1.22 Others......................................................................................................... 2-31

2.5.1.23 Confirming USB ........................................................................................ 2-31

2.6 DDC write data contents.................................................................................................... 2-32

2.7 Self-diagnosis shipment setting........................................................................................ 2-33

2.8 Default inspection ............................................................................................................... 2-33

2.8.1 Default setting of switches ...................................................................................... 2-33

2.8.2 Default setting of OSD ............................................................................................. 2-33

2.8.3 Checking the labels.................................................................................................. 2-33

2.8.4 Packaging .................................................................................................................. 2-33

2.9 Degaussing with handy-demagnetizer............................................................................. 2-34

2.9.1 General precautions................................................................................................. 2-34

2.9.2 How to hold and use the handy-demagnetizer ................................................... 2-34

2.10 Timing chart....................................................................................................................... 2-35

2.11 Adjustment timing ............................................................................................................. 2-36

3. Schematic diagram

4. Exploded view

Serial Number Information

Specification

User's guide for North America

User's guide for Europe

All parts list

1 - 1

1. Circuit description

1.1 Power block

1.1.1 Outline

(1) The power block is compatible with 100 to 120VAC/220 to 240VAC(50/60Hz).

(2) The active filter circuit is adopted to suppress the higher harmonic current and improve

the power factor.

(3) The circuit that supplies the electric power to the secondary side is divided into two

circuits that are respectively called the main power and sub power.

Though both main and sub circuits supply the power to the secondary side in the normal

operation mode, the power is supplied from the sub power only in the power save mode

since the main power is stopped.

The main power is the configuration used the flyback converter type switching control IC of

the simulative resonant operation. Moreover, the sub power is the configuration used PRC

(OFF width fix) control IC.

(4) The output on the secondary side is shown in Table 1.

(Refer to the power system diagram1-3 in Pages 1-3, 1-4 and 1-5.)

Table 1

1.1.2 Rectifying circuit

(1) The AC input voltage is rectified in the full wave mode with the diode bridge in D901.

(2) In the higher harmonic circuit of the section 1.1.4, the AC input current becomes the sine

wave form in the same phase with the AC input voltage waveform, but the interference is

given to other peripheral devices since the noise of the switching current appears on the

input side owing to the switching waveform. Therefore, L902 and C906 are inserted to

suppress the noise that is caused by the switching current.

1.1.3 Surge current suppression

(1) TH901 (thermistor) suppresses the rush current that flows when the power switch is turned

ON. Moreover, D933 is added to protect D902 from the rush current.

Power block

Main power

side +215V

+80V

+15V

-15V

+12V

+7.5V

+5V

P-OFF+5V

H. deflection circuit, Video cut off circuit

Video circuit, DBF circuit, High voltage circuit

H/V deflection circuit, etc.

Video circuit, H. deflection circuit, etc.

Heater

MPU, etc.

Video circuit, etc.

Sub power

side

Output voltage

OFF

When power save

Application

1 - 2

1.1.4 Higher harmonic circuit

(1) The pulsating waveform rectified in the full wave mode by D901 is switched throughout the full cycle

by the frequency of several tens kHz or more. Through this, the input current waveform becomes

an average of the switching currents of the partial cycles, thus becoming the sine waveform in the

macro. (See Fig.1)

(2) For the AC input voltage, the AC input current of the sine wave type in the same phase flows to

achieve the power circuit of improved power factor and reduced higher harmonic wave component.

(3) L903 is the choke coil, Q901 is MOS FET, D902 is the rectifying diode, C911 is the block capacitor,

and IC901 is the power factor improved controller. The power factor improved controller uses

MC33262P of Motorola. (See Fig. 2)

(4) After the sub power circuit operates, P-SUS signal becomes HI when +5V voltage is supplied to the

MPU. Then, Q902 is turned ON, the voltage of approx. +18V is supplied to pin8 (VCC terminal) of

IC901 through D929 from pin2 of T902, and the following operation is started.

(5) The pulsating voltage waveform rectified in the full wave mode by D901 is divided with R904, R905,

R906, R907 and R908 (100VAC : 1.1Vp-p and 240VAC: 2.9Vp-p), and is input to pin3 of IC901

(Multiplier input). Moreover, the output (+side of C911: 400VDC) of the higher harmonic circuit is

divided with R913, R914, R915, R916 and R917 (2.5VDC), and is input to pin1 of IC901 (error

amplifier input).

(6) The output of the error amplifier and the divided waveform of the pulsating voltage input to pin3 of

IC901 sets the threshold voltage of the current sense comparator to control the Q901 flowing

current from zero to the peak line of the AC input voltage in the sine wave pattern.

(7) When Q901 is turned ON, the drain current of Q901 flows to R910 and R937 to drop the voltage,

and the voltage generated by the voltage drop is input to pin4 (current sense input) of IC901. When

the voltage reaches the threshold voltage of the current sense comparator, Q901 is turned OFF.

(8) When Q901 is turned OFF, the accumulated energy of L903 starts to be supplied to the load

through D902.

(9) As the accumulated energy of L903 drops, the auxiliary coil voltage (pin8 of L903) also drops.

When it reaches the threshold voltage of *zero current detector, Q901 will be turned ON again.

* Pin 5 of IC901 is the zero current detection terminal to input the auxiliary coil voltage of pin10 of

L903. The zero current detector monitors that the auxiliary coil voltage drops beyond the thresh

old voltage. Thus, the accumulated energy of L903 is indirectly detected.

(10)The above operation is repeated to continue the oscillating operation. Thus, the DC voltage (L903,

Q901, D902 and C911 compose the voltage rise circuit.) is gained on the output, and the AC input

current of the sine wave in the same phase with the AC input voltage is gained on the input side.

Peak

IQ901

Averag

ID902

ON

MOSFET

Q901

OFF

Figure 1. L903 coil current

1 - 3

PG PG PG

Error amplifier

10 ˚A

Overvoltage

comparator

C908

R918

R904

C906

R905R906R907R908

C909

L905

R910

R937

C910

R911

R919R920

R913

C911

R914R915R916

R921

R917

D933

D902

IC901

L903

L902 Waveform 1

(Refer to P1-11.)

Quick

start

1.08Vref

Timer R

Vref

6 5 4 3 2 1

7 8 9 10 11 12

Delay

Multi plier

2.5V Reference

voltage source

13V/

8.0V

1.6V/

1.4V

RS latch

Drive

output

UVLO

16V 10

20k

R912

R909

Q901

10pF

36V

1.2V

6.7V

Current sense

comparator

Zero current detector

MC33262P

Waveform2, 3

(Refer to P1-11.)

Figure. 1

(Refer to P1-2.)

6 2

Vref

2.5V

Q902

400V

Figure 2. High harmonic waveform circuit

1 - 4

1.1.5 Sub power circuit

(1) The sub power uses PRC control regulator STR-G6352 (IC903) produced by Sanken Electric. (See Fig.3)

(2) When the power switch is turned ON, the rectified and smoothened DC voltage (AC voltage

x ) is supplied to pin4 of IC903, through R950, R951 and R952. When pin4 reaches

approx. 17V, the built-in output FET is put into operation. (Since Q902 is OFF, IC902 and

IC 903 do not operate.)

(3) This also induces the voltage at pin2 of T902 and on the secondary side. These outputs

are respectively rectified, and are used as the power for control on the primary side and

the power for the MPU.

(4) IC903 monitors +5V and -15V output on the secondary side by IC922 (Shunt regulator),

and suppresses the voltage regulation by feeding back to pin 5 of IC903 via IC912

(Photocoupler).

(5) When the voltage on the secondary side starts, the MPU will be put into operation and the

P-SUS signal line will become HIGH.

(6) This information is transmitted to the primary side via IC913 to turn ON Q902.

When Q902 is turned ON, the power for control on the primary side will be supplied to

IC901 and IC902 to operate the higher harmonic circuit. Thus, the main power circuit will

be put into operation.

1.1.6 Main power circuit

(1) The main power circuit adopts the flyback type switching power of pseudo-reosonance

operation. This is composed of a Sanken brand hybrid IC STR-F6676 (IC902) that inte-

grates the power MOS-FET and control IC.

The circuit operation is described as follows. (See Fig. 4.)

(2) The timing at that the power MOS-FET is turned ON is consistent with the bottom point of

the voltage resonant waveform after the transformer (T901) discharges the energy to the

secondary side, that is, a half cycle of the resonant frequency determined by LP value

(primary coil inductor value) of T901, and C914 (resonant capacitor). This is called

pseudo-reosonance operation. The advantage of such an effect is that the switching loss

is reduced by turning it ON when the voltage between the drain sources of the power MOS-

FET becomes the lowest.

(3) Like the higher harmonic circuit, voltage of approx. +18V is supplied to the Vcc terminal

(Pin 4) of IC902 (STR-F6676) via D929 from pin2 of T902 when Q902 is turned ON by the

P-SUS signal from the MPU.

When the voltage of Pin 4 of IC902 reaches 16V, the control circuit will be put into opera-

tion to turn ON the integrated MOS-FET.

(4) When MOS-FET is turned ON, the capacitor C1 in IC will be charged to approx. 6.5V. On

the other hand, the drain current flows to R928, and the voltage generated by the voltage

drop is applied to pin1 (OCP/FB terminal) of IC902.

When the voltage of Pin 1 reaches approx. 0.73V, the comparator (Comp. 1) in IC will be

activated to turn OFF MOS-FET.

(5) The voltage between both ends of C1 drops to approx. 3.7V. the oscillator output will be

reversed again to turn ON MOS-FET.

The above is repeated to continue the oscillation operation.

(6) Here, IC902 monitors +215V of the output on the secondary side with IC921 (error ampli-

fier) and feeds back it to pin1 of IC902 via IC911 (photocoupler), thus suppressing the

voltage fluctuation of the primary side.

Other manuals for MultiSync FP1355 FP1355 FP1355

Table of contents

Other NEC Monitor manuals

NEC

NEC AccuSync LCD72V User manual

NEC

NEC AccuSync LCD92VXM Instruction Manual

NEC

NEC LCD4000-BK User manual

NEC

NEC LC15m User manual

NEC

NEC P60XC10 User manual

NEC

NEC MultiSync E1100 User manual

NEC

NEC MultiSync EA223WM Parts list manual

NEC

NEC LCD4020-2 User manual

NEC

NEC LCD195VX-BK - MultiSync - 19" LCD Monitor User manual

NEC

NEC MultiSync LCD1980FXi User manual

NEC

NEC V221W User manual

NEC

NEC PlasmaSync P42XP10-BK User manual

NEC

NEC MultiSync SC40 User manual

NEC

NEC PlasmaSync 50XM4 User manual

NEC

NEC MultiSync XM37 Xtra User manual

NEC

NEC MultiSync V651-TM User manual

NEC

NEC AccuSync LCD3000 User manual

NEC

NEC AccuSync LCD93V User manual

NEC

NEC AccuSync LCD52V User manual

NEC

NEC MultiSync 20WMGX2 User manual

NEC

NEC MultiSync 77F User manual

NEC

NEC MultiSync V404 User manual

NEC

NEC MultiSync V462-TM Installation and operating instructions

NEC

NEC NCL-1510 User manual

Popular Monitor manuals by other brands

Samsung

Samsung ME32C user manual

ViewSonic

ViewSonic VA926-LED user guide

Furuno

Furuno Mu 120c Operator's manual

Asus

Asus VB171D - 17" LCD Monitor Service manual

AOC

AOC 9GLR Technical specifications

DMG

DMG RAFFAELLO manual

AOC

AOC LM720 - 17" Technical specifications

Sony

Sony Trinitron GDM-F500 Service manual

Memorex

Memorex MT1701 user guide

ViewSonic

ViewSonic VE510s-4 Service manual

Farenheit

Farenheit T-1503CM instruction manual

Ditel

Ditel DINOS DN129/AT Quick installation guide

Sony

Sony SDM-S51 Specifications

Kenwood

Kenwood DMX1025BT quick start guide

Dell

Dell S2409WFP user guide

EverFocus

EverFocus EN-7517E instruction manual

Dell

Dell P3222QE user guide

Panasonic

Panasonic TH152UX1 - 152" PLASMA TV Service manual

NEC MultiSync FP1355 FP1355 FP1355 User manual

Popular Monitor manuals by other brands