Mp-man Pdv-78 User manual

Service Manual

(7 Inch) LCD Color Monitor &

DVD Player

MODEL :PDV-78

1、Specification.....................................................…...............................................………………… 2

2、Block Diagram.................................…................................................................………………….4

3、General Alignment Instruction.....................................................................…………….....…..5

4、Troubleshooting.........................................................................................……………………….. 7

5、Printed Circuit Board......................................................................................…………………...12

6、Explode View......................................................................................................………………….13

7、IC Block Diagram and Lead Identification.....................................................………………..29

8、Schematic Diagram.......................................................................................……………………..39

SPECIFICATION

Description Condition Unit Limit Nominal Result

Video Signal Level Vp-p 0.7±0.1 0.7

SYNC Lever Vp-p 0.3±0.1 0.3

Video out level Vp-p 1.0±0.2 1.0

Video out level(No Loader)

75% color bar, 75

0hm

Vp-p 2.0±0.2 2.0

Y(100% color bar) mV 700±140 700

S-VIDEO out level

C(100% color bar) mV 880±176 880

CD 1KHz/0dB V 0.6±0.2 0.7

Audio out level

DVD 1KHz/0dB V 1.4±0.2 1.25-1.4

20Hz dB ≤±3 0

125Hz dB ≤±3 0

10KHz dB ≤±3 0

Frequency Response

(20 Hz – 20 kHz)

20KHz dB ≤±3 0

Signal-to-noise ratio

(add A)

Infinity

zero/-&dB/L&R

dB ≥75 ≥75

Audio distortion & noise 1KHz/0dB/L&R dB ≤-65 -65

Dynamic range 1KHz/-60dB dB ≥85 ≥85

R/L Cross sound 1KHz/0dB/L&R dB ≥45 ≥45

1 kHz Channel Unbalance 1KHz/0dB/L&R dB ≤3 0

Standby W 0 0

Power Consumption

DC 9V Rating

(DVD+Monitor) W ≤12 ≤12

Eccentricity A-BEX TDV-552 um ≥100 100

Scratch A-BEX TDV-541 mm ≥1.6 1.6

Black dot A-BEX TDV-PW525CW mm ≥￠0.8 0.8

Finger Print A-BEX TDV-PW525CW um ≥￠65 65

Vertical Deviation A-BEX TDV-MW533CW mm ≥0.6 0.6

HEADPHONE OUTPUT 1KHz,400mV mW 3±2 3

HEADPHONE Noise No Signal mV ﹤1mV ﹤1mV

L 1KHz/0dB mW 500±100 500 SPK MAX Output

(DVD) R 1KHz/0dB mW 500±100 500

L 1KHz/0dB mW 500±100 500 SPK MAX Output

(AV IN) R 1KHz/0dB mW 500±100 500

HEADPHONE S/N

(add A)

Infinity

zero/-&dB/L&R

dB ≥75 75

SPK S/N

(add A)

Infinity

zero/-&dB/L&R

dB ≥50 50

20Hz dB ≤±3 0

125Hz dB ≤±3 0

10KHz dB ≤±3 0

HEADPHONE RESP

(20Hz~20KHz)

20KHz dB ≤±3 0

20Hz dB ≤±3 0

125Hz dB ≤±3 0

10KHz dB ≤±3 0

Amplifier Frep Resp

(20Hz~20KHz)

20KHz dB ≤±3 0

BLOCK DIAGRAM

LCD

DVD PART

GENERAL ALIGNMENT INSTRUCTION

The Main PCB of Monitor Modification:

1. Input voltage is 6.8V-16V, input signal is test circuit BY 5418.

2. Adjust VR1 to get good performance.

TROUBLESHOOTING

SYMPTOM CAUSE REMEDY

LCD MONITOR PART

1) No Picture  Defective IC U2  Replace U2 ( VX1827 )

2) No Picture, Picture no

Good

 Defective IC AT8430.

 Replace. C AT8430

3) Luminesce no good  Defective IC U3  Replace U3 ( 4558/3414 )

4) Color is no good  Defective C214.C216.C218  Replace C214.C216.C218

( 1UF )

5) SYNC no good  Defective IC U2  Replace U3 ( VX1827 )

6) TINT no good  Defective IC U2  Replace U3 ( VX1827 )

7) NO Picture  Defective IC U3 OR HV U1

 Replace U3( VX1827 ) OR HV

U1(MP1026)

8) Picture no good  Defective Y1  Replace Y1 ( 20MHZ )

9) Brightness no good  Defective IC U3  Replace U3 ( 4558/3414 )

TROUBLESHOOTING

SYMPTOM CAUSE REMEDY

DVD PART

1) No Power

 Power source is not correct.

The positive and negative does

not match the unit.

 Power button defective.

 Defective triode IC U1 OR Q1

 Replace power source.

 Charge the position of positive

and negative.

 Replace power button.

 Replace U1 ( 8521 ) OR Q1

( SI2307 )

2) No Picture

 Defective IC T3

 Defective IC U10 OR T4

 Defective IC U2

 Replace T3 ( 24C02 ).

 Replace U10（64M SDRAM）

OR T4（FLASH:29LV800）.

 Replace U2 ( MT1389E/E )

3) No Sound  Defective IC U6

 Defective IC U5

 Replace U6 ( C4558 ).

 Replace U5 ( TDA2822 )

4) Sound no good  Defective IC U6

 Defective IC U5

 Defective V2

 Replace U6 ( C4558 ).

 Replace U5 ( TDA2822 )

 Replace V2 ( 10KΩ)

5) Can not read DISC  Defective IC U3

 PICK-up Laser is defective.

 Defective IC U2

 Replace U3 ( CD5654 )

 Replace pick up.

 Replace U2 ( MT1389E/E )

6) No key function  Defective IC U2  Replace U2 ( MT1389E/E ).

7) No remote control function  Defective T1

 Key is Defective.

 Replace T1

( NTL6OH380AF3 )

 Replace keys.

8) LCD NO Picture  Defective U2  Replace U2 ( MT1389E/E )

PRINTED CIRCUIT BOARD

Monitor Main PCB

Top View

Monitor Main PCB

Bottom View

Monitor HV PCB

Top View Bottom View

DVD Main PCB

TOP View

DVD Main PCB

Bottom View