AOC VP17 Service Manual

17" LCD Color Monitor

HP VP17

Service

Service

Service

		Horizontal Frequency
		2483 kHz
	TABLE OF CONTENTS
Description	Page Description	Page

Table Of Contents.......……..............................…........1

Revision List.…........................................……......2

1.Monitor Specification..............................………........4

2.LCD Monitor Description…………………………….......5

3.Operation Instruction…………...............……...........6

3.1.General Instructions...........................…...........6

3.2.Control Button…………….…..............……...............6 3.3 Adjusting the Picture...........................…............7

4.Input/Output Specification............……………............10

4.1.Input Signal Connector............………….................10

4.2.Factory Preset Display Modes......…..................11

4.3.Power Supply Requirements...............................11

5.Panel Specification.....………………..................12

5.1.General Feature…….....………………..................12

5.2.Optical Characteristics………………………………13

6.Block Diagram……...................…………................14 6.1 Software Flow Chart………………………………...14 6.2.Electrical Block Diagram……………..….......16

7. Schematic……………......................................18

7.1Main Board....……………......................................18

7.2Power Board.….…………......................................22

7.3Key Board.….…………..…....................................25 8.PCB Layout..…….......................................26

8.1.Main Board………................................................26

8.2.Power Board….....................................................28

8.3.Key Board……….......................….......................30 9. Maintainability……….......................................31

9.1.Equipments and Tools Requirement…….............31

9.2.Trouble Shooting…….........................................32 9.2.1 Main Board…………...........................................32 9.2.2 Power Board……………...…..............................34 9.2.3 Key Board…………............................................36 10 White-Balance, Luminance adjustment..................37 11.Mechanical Instructions……………..…...….......39 12. Monitor Exploded View………………..…....….......46 13. BOM List………………………………..……………47

SAFETY NOTICE

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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17" LCD Color Monitor				HP VP17
			Revision List
	Version	Date	Revision History	TPV Model Name
	A00	Dec.-04-07	Initial release	T77CMLMMH6HADN

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17" LCD Color Monitor

HP VP17

Important Safety Notice

Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.

It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

Hereafter throughout this manual, AOC Company will be referred to as AOC.

WARNING

Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock, fire, or other hazards.

Under no circumstances should the original design be modified or altered without written permission from AOC. AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.

Servicer assumes all liability.

FOR PRODUCTS CONTAINING LASER:

DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.

CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION -The use of optical instruments with this product will increase eye hazard.

TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE MANUAL.

Take care during handling the LCD module with backlight unit

-Must mount the module using mounting holes arranged in four corners.

-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen. -Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the panel.

-Protect the module from the ESD as it may damage the electronic circuit (C-MOS). -Make certain that treatment person’s body is grounded through wristband.

-Do not leave the module in high temperature and in areas of high humidity for a long time.

-Avoid contact with water as it may a short circuit within the module. -If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may damage the panel.)

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17" LCD Color Monitor

HP VP17

1. Monitor Specification

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17" LCD Color Monitor

HP VP17

2. LCD Monitor Description

The LCD Monitor will contain main board, power board and a key board which house the flat panel control logic, brightness control logic and DDC.

The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

Monitor Block Diagram

	CCFT Drive.	Flat Panel and
		CCFL backlight

Power Board			Main Board
							RS232 Connector
(Include adapter board)
							For white balance
							adjustment in
							factory mode
			Keyboard
AC-IN							Video signal, DDC
				HOST Computer
110V-240V

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17" LCD Color Monitor

HP VP17

3. Operation Instructions

3.1 General Instructions

Press the power button to turn the monitor on or off. The other control buttons are located at front of the panel. By changing these settings, the picture can be adjusted to your personal performance.

-The power cord should be connected and insert to adaptor.

-Connect the video cable from the monitor to the computer VGA card.

-Press the power button to turn on the monitor, the power indicator will light up to Green.

3.2Control Button

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17" LCD Color Monitor

HP VP17

3.3 Adjust the Picture

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17" LCD Color Monitor

HP VP17

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17" LCD Color Monitor

HP VP17

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17" LCD Color Monitor				HP VP17
4. Input/Output Specification
4.1 Input Signal Connector
	Pin	Signal	Pin	Signal
1		Red Video	9	3.3/+5 V (from PC)
2		Green Video	10	Sync Ground
3		Blue Video	11	None
4		None	12	DDC Data
5		Ground (DDC Return)	13	Horizontal Sync
6		Red GND	14	Vertical Sync
7		Green GND	15	DDC Clock
8		Blue GND

VGA connector layout

PIN 1	PIN 5
PIN 11

Pin	Signal	Pin	Signal	Pin	Signal
1	TMDS Data 2 -	9	TMDS Data 1 -	17	TMDS Data 0 -
2	TMDS Data 2 +	10	TMDS Data 1 +	18	TMDS Data 0 +
3	TMDS Data 2 / 4 Shield	11	TMDS Data 1 / 3 Shield	19	TMDS Data 0 / 5 Shield
4	TMDS Data 4 -	12	TMDS Data 3 -	20	TMDS Data 5 -
5	TMDS Data 4 +	13	TMDS Data 3 +	21	TMDS Data 5 +
6	DDC Clock	14	+3.3/+5V Power (from PC)	22	TMDS Clock Shield
7	DDC Data	15	Ground (Return for +5V)	23	TMDS Clock +
8	No Connect	16	Hot Plug Detect (connect internally to pin-14)	24	TMDS Clock -
			DVI-D digital connector layout

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17" LCD Color Monitor

HP VP17

4.2 Factory Preset Display Modes

4.3 Power Supply Requirements

Parameter	Range
AC Input Voltage	90 to 265V
AC Input Frequency	45 to 63 Hz
Inrush Current	50A MAX AT 220VAC and 30A AT 120VAC
Leakage Current	5 mA MAX at 120VAC
Power Consumption	≤37W

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17" LCD Color Monitor

HP VP17

5. Panel Specification

5.1 General Feature

CLAA170EA07P is 17.0” color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD panel, driver ICs, control circuit and backlight. By applying 8 bit digital data, 1280×1024, 16.2M-color images are displayed on the 17.0” diagonal screen. Input power voltage is 5.0V for LCD driving. Inverter for backlight is not included in this module. General specification are summarized in the following table:

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17" LCD Color Monitor

HP VP17

5.2 Optical Characteristics

Ta=25 VCC=5.0V

5.3 Electrical Characteristics

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17" LCD Color Monitor

HP VP17

6. Block Diagram

6. 1 Software Flow Chart

1

Y

2 3

N

4

5	N
Y
6

N

7 8

Y

9

	10	N	11
	Y
N	12		13	N
	Y		Y
	14		15	N
				16
			Y
			17

18 N 19

Y

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17" LCD Color Monitor

HP VP17

REMARK:

1)MCU initialize.

2)Is the EEprom blank?

3)Program the EEprom by default values.

4)Get the PWM value of brightness from EEprom.

5)Is the power key pressed?

6)Clear all global flags.

7)Are the AUTO and SELECT keys pressed?

8)Enter factory mode.

9)Save the power key status into EEprom. Turn on the LED and set it to green color. Scalar initialize.

10)In standby mode?

11)Update the lifetime of back light.

12)Check the analog port, are they’re any signals coming?

13)Does the scalar send out an interrupt request?

14)Wake up the scalar.

15)Are there any signals coming from analog port?

16)Display "No connection Check Signal Cable" message. And go into standby mode after the message disappear.

17)Program the scalar to be able to show the coming mode.

18)Process the OSD display.

19)Read the keyboard. Is the power key pressed?

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17" LCD Color Monitor

HP VP17

6.2 Electrical Block Diagram

6.2.1 Main Board

LCDInterface

		Scalar TSUM56AWHL
OSD Control
				Crystal
Interface (Keypad)		(Include: MCU, ADC, OSD etc)
				14.318MHZ

				D-SUB		EEPROM
				Connector		PM25LV010-25
DVI-SIGNAL
Connector

EEPROM

24C02

EEPROM 24C02

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17" LCD Color Monitor

HP VP17

6.2.2 Inverter / Power Board

AC input			Bridge				Rectifier
	EMI filter				Transformer
			Rectifier				diodes
			and Filter

Start Circuit
								CN902
								12V
					Over		Feedback
	PWM
							Circuit
					Voltage			5V
	Control IC
					Protect

ON/OFF

LC
		Transformer		MOSFET
Resonance

Lamp

			Over					ON/OFF
Feedback
						PWM
Circuit			Voltage					Control
					Control IC
								DIM

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17" LCD Color Monitor

HP VP17

7. Schematic

7.1 Main Board

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