LITE-ON B17AA Service Manual

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Service Manual

17-inch LCD Monitor B17AAU/B17ANU/B17AAY

Service Manual Versions and Revision

No. Version Release Date Revision

1. 1.0 Feb. 5, 2002 Original release

This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp.

B17AAU / B17ANU / B17AAY Service Manual.

Printed in Taiwan.

Trademarks

LiteOn is a registered trademark of LiteOn Technology Corp.

All other trademarks are the property of their respective owners.

B17AAU / B17ANU / B17AAY

Table of Contents

1. Audio circuit --------------------------------------------------------------------------------------------------------------- 1

1.1 Audio input ------------------------------------------------------------------------------------------------------------ 1

1.2 Audio output ---------------------------------------------------------------------------------------------------------- 1

2. Power supply -------------------------------------------------------------------------------------------------------------- 1

3. Video input circuit -------------------------------------------------------------------------------------------------------- 1

4. Definition converter LSI peripheral circuit ---------------------------------------------------------------------------- 1

5. System reset, LED control circuit --------------------------------------------------------------------------------------- 1

6. E2PROM for PNP --------------------------------------------------------------------------------------------------------- 1

7. E2PROM -------------------------------------------------------------------------------------------------------------------- 2

8. CPU circuit ----------------------------------------------------------------------------------------------------------------- 2

8.1 Dection of POWER switch status ---------------------------------------------------------------------------------- 2

8.2 Display mode identification ----------------------------------------------------------------------------------------- 2

8.3 User control ----------------------------------------------------------------------------------------------------------- 4

8.4 Control of identification converter LSI (IC 14) ------------------------------------------------------------------ 5

8.5 I2C bus control -------------------------------------------------------------------------------------------------------- 5

8.6 Power ON sequence -------------------------------------------------------------------------------------------------- 6

8.7 Power OFF sequence ------------------------------------------------------------------------------------------------- 7

8.8 List of CPU assignments --------------------------------------------------------------------------------------------- 8

9 Power Board Operation Therory ------------------------------------------------------------------------------------------- 8

Circuit Description Index

B17AAU / B17ANU / B17AAY

1. Audio circuit (Circuit diagrams Main PWB) KT

1.1 Audio input

The audio signal input received from the audio input terminal (P311) is applied to the amplifier I332 of 4 (L-CH)

and 9 (R-CH) through the low-pass filter consisting of R408, R410, R409, R407, C598 and C599.

In this amplifier, controls of Volume, and mute are conducted. The audio signal controlled at the pin 6 deter-

mines the attenuation of output of the amplifiers. Since then, the signal is output to the jack P312.

1.2 Audio output

The audio signal is output from the jack output terminal (P312) of the jack board to the internal speaker system.

2. Power supply (Circuit daigrams MAIN PWB 6/8, 7/8)

2.1 P310 connector

A 5V power supply for LCD module, CPU, and logic is generated from the P310 connector.

2.2 I323:3-terminal regulator

A 3.3V power supply for Scaler IC I315, LVDS IC I319, I320 is generated from the 5V source.

2.3 I324:3-terminal regulator

A 2.5V power supply for Scaler IC I315 is generated from the 5V source.

Q307, I321 ON/OFF control for LCD Module

ON/OFF control is performed for power ON/OFF and also for the power saving sequence.

3. Video input circuit (Circuit diagram MAIN PWB 3/8)

The analog video signal input entered from P304, the AC-coupled video signal is used to clamp the black level at

0V).

4. Definition converter LSI peripheral circuit (Circuit diagram MAIN PWB)

I315 gm5020 is the definition converter LSI.

The analog R, G, B signal input entered from the video input circuit is converted into the digital data of video

signal through the incorporated A/D converter. Based on this conversion, this device performs interpolation

during pixel extension. The source voltage for this device is 3.3V, 2.5V and the system clock frequency is

24MHz. The withstand voltage level for the input signal voltage if I315 is 3.3V and 5V.

5. System reset, LED control circuit (Circuit diagram MAIN PWB 2/8)

5.1 System reset

System reset is performed by detecting the rising and falling of the 5V source voltage at I301.

5.2 LED control circuit

Green / amber is lit with the control signal of the LED GREEN and LED AMBER signal pin 25, 26 from I302

(Circuit diagram MAIN PWB 2/8).

6. E2PROM for PnP (Circuit diagram MAIN PWB 3/8)

Page 1Circuit Description

B17AAU / B17ANU / B17AAY

7. E2PROM (Circuit diagram MAIN PWB 2/8)

Data transfer between I305 (24LC16) and CPU (Circuit diagram MAIN PWB 2/8 (I302) is effected through the

IIC bus SCL (pin 17) and SDA (pin 16) of I302. The data to be transferred to each device are stored in I305.

l I315 control data.

l OSD related setting data.

l Other control data for service menu.

8. CPU circuit (Circuit diagram MAIN PWB 2/8)

I302 (87C51RD2) functions as the CPU.

The source voltage for the device is 5.0V and the system clock frequency is 24MHz.

8.1 Detection of POWER switch status

The CPU identifies the ON status of the two power supplies. The identification is made when the power supply

is turned off. For example, if the power supply is turned off with the POWER switch, the POWER switch must be

turned on when activating the power supply again. If the power supply is turned off by pulling out the power

cord, then this power supply can be turned on by connecting the power cord, without pressing the POWER

switch.

8.2 Display mode identification

8.2.1 Functions

(1) Display mode identification

l The display mode of input signal is identified based on Table 1.

l When the mode has been identified through the measurement of horizontal and vertical frequencies, the total

number of lines is determined with a formula of  Horizontal frequency / Vertical frequency = Total number

of lines. Final identification can be made by examining the coincidence of the obtained figure with the

number of lines for the mode identified from the frequency. The boundary number of lines in each mode is

shown in Table 2.

l When the detected frequency if the sync signal has changed, the total number of lines should be counted even

through it is rge identified frequency in the same mode.

(2) Power save mode.

This power save mode is assumed when the frequency of the horizontal / vertical signal is as specified below.

l Vertical frequency : 50 ~ 86 Hz

l Horizontal frequency : 24 ~ 92 KHz

l VTOTAL : 1200 or more.

(3) Power save mode.

The power save mode is assumed when the horizontal / vertical signals are as specified below.

l If there is no horizontal sync signal input.

l If there is no vertical sync signal input.

l If the horizontal sync signal is outside the measuring range of gm5020.

l If the vertical sync signal is outside the measuring range of gm5020.

Page 2 Circuit Description

Table 1

(

)

B17AAU / B17ANU / B17AAY

Band Width

KHz

1. VGA 720 x 400 70Hz 31.47 28.322 - +

2. VGA 640 x 480 60Hz 31.47 25.175 - -

3. MAC 640 x 480 66Hz 35 32.24 - -

4. VESA 640 X 480 72Hz 37.86 31.5 - -

5. VESA 640 X 480 75Hz 37.5 31.5 - -

6. VESA 800 x 600 56Hz 35.16 36 + +

7. VESA 800 x 600 60Hz 37.88 40 + +

8. VESA 800 x 600 75Hz 46.88 49.5 + +

9. VESA 800 x 600 72Hz 48.08 50 + +

10. MAC 832 x 624 75Hz 49.72 57.283 - -

11. VESA 1024 x 768 60Hz 48.36 65 - -

12. VESA 1024 x 768 70Hz 56.48 75 - -

13. VESA 1024 x 768 75Hz 60.02 78.75 + +

(MHz)

PolarityMode Resolution H-fre

14. VESA 1280 x 1024 60Hz 64 108 + +

15. VESA 1280 x 1024 75Hz 80 135 + +

16. VESA 1152 x 864 75Hz 67.5 108 + +

17. VESA 1280 x 960 60Hz 60 108 + +

Page 3Circuit Description

Table 2 the number of the lines, Vsync distinction

B17AAU / B17ANU / B17AAY

Indication resolution The number of the

distinction lines

640 x 480 487 < LINE < 607 fV < 63 Hz 2

800 x 600 607 < LINE < 777 fV < 58 Hz 6

832 x 624 640 < LINE -10

1024 x 768 768 < LINE < 870 fV < 63 Hz 11

1152 x 864 870 < LINE < 1031 16 1280 x 960 960 < LINE < 1027 17

1280 x 1024 1027 < LINE 14,15

8.3 User Control

8.3.1 Related ports of I315 and pin of I302

Distinction Vsync The fixed mode

63 Hz < fV < 68 Hz 3 68 Hz < fV < 74 Hz 4 74 Hz < fV < 78 Hz 5

58 Hz < fV < 63 Hz 7 63 Hz < fV < 73 Hz 9 73 Hz < fV < 78 Hz 8

68 Hz < fV < 73 Hz 12 73 Hz < fV < 78 Hz 13

Port Pin No. I/O Signal name Function Remarks

GPI04 I315, M1 1 MENU EXIT/ENTER switch input ENTER/Withdraw

from OSD

GPI05 I315, L1 1 DOWN switch input ( ) key

GPI06 I315, G18 1 - switch input ( ) key

GPI07 I315, G19 1 + switch input ( ) key

GPI0 I302, 15 1 POWER soft power switch input ( power ) key

8.3.2 Functions

Control is effected for the push-switches to be used when the user changes the parameters, in order to modify the

respective setting values. Whether the switch has been pressed is identified with the switch input level that is

turned L.

Each switch input port is pulled up at outside of ASIC

Each parameter is stored in the EEPROM, the contents of which are updated as required.

Page 4 Circuit Description

8.4 Control of definition converter LSI I315

8.4.1 Ports related to control

Pin No. I/O Signal name Function

R3 I IRQ gmZan1 interrupt signal

P1 O HCLK gmZan1 serial clock

P3, P4,

P2 O HFS gmZan1 serial select

8.4.2 Functions

Major function of I315 are as follows:

(1) Expansion of the display screen.

(2) Timing control for various signal types.

(3) Power-supply sequence (LCD panel).

8.5 I2C bus control

8.5.1 Related ports of I302

Port Pin No. I/O Signal name Function

P3.5 17 I IICCLK IIC bus clock P3.4 16 I/O IICDATA IIC bus data

I/O HDATA gmZan1 serial data

B17AAU / B17ANU / B17AAY

8.5.2 I2C-controlled functions

The following functional controls are effected by I2C.

(1) Control of EEPROM I305f for parameter setting.

(2) Control of audio preamplifier.

Page 5Circuit Description

B17AAU / B17ANU / B17AAY

8.6 Power ON sequence

When the POWER switch is pressed, the POWER OFF signal is turned H. When this H potential is detected,

the CPU begins to establish the respective power supplies according to the sequence shown below.

POWER

LED

LVCC (Audio_EN)

Panel_VCC

PCLK/DATA

Backlight_EN

Page 6 Circuit Description

B17AAU / B17ANU / B17AAY

8.7 Power OFF sequence

When the POWER switch is pressed while the power supply is ON, the POWER ON signal is turned H. When

this H potential is detected, the CPU begins to turn off the respective power supplies according to the sequence

shown below.

POWER

LVCC (Audio_EN)

LED

Panel_VCC

Backlight_EN

PCLK/DATA

Page 7Circuit Description

B17AAU / B17ANU / B17AAY

8.8 List of CPU Pin Assignments

Port Pin No. Signal Name Initial Setting Function Remark

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.9

P3.0

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

P2.0

P2.1

P2.2

P2.3

P2.4

P2.5

P2.6

P2.7

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0







!

"

#

$

%

&

'





!

!

"

"



NC ~ ~

HDATA0 ~ gm5020 4bit interface data

HDATA1 ~ gm5020 4bit interface data

HDATA2 ~ gm5020 4bit interface data

HDATA3 ~ gm5020 4bit interface data

HCLK ~ gm5020 4bit interface Clock

HFS ~ gm5020 data Enable

Pand-EN H Panel VCC Enable

IIC-EN H IIC Enable

RST L Reset CPU Active H

RXD H Receive data

NC ~ ~

TXD H Transmit data

IRQ ~ gm5020 interrupt signal

PWR_SW ~ ON/OFF monitor power

SDA H IIC Bus Data

SCL ~ IIC Bus Data Active L

NC ~ ~

DDC_GND L Detect Dsub cable plug-in

XTAL2 ~ Crystal signal out

XTAL ~ Crystal signal in

GND ~ ~

NC ~ ~

LED GRN H LED Green ON / OFF

LED AMB H LED Amber ON / OFF

MUTE H Audio MUTE

CUSP H Audio SUSP

BACK_EN H Backlight Enable

LVDS_ON H LVDS IC ON / OFF

NC ~ ~

PSEN# H Program store enable

NC ~ ~

EA# H External Access Enable

NC ~ ~

VCC ~ VCC

Page 8 Circuit Description

B17AAU / B17ANU / B17AAY

9. Power Board Operation Therory

9.1 Line filter consists of C801, T801, C802, C803, C804. It eliminates high frequency interference to meet EMIs

requirement.

9.2 Rec & Filter

Bridge diode D801 converts AC source into pulsed DC. This pulsed DC is smoothed and filtered by C805. R802

is an NTC ( negative thermal coefficient ) resistor, used to reduce inrush current to be within safe range.

9.3 Power transformer :

T802 converts energy for square wave from power source C805 to secondary side to generate +12V and +5V.

9.4 Output :

The square wave from T802 is rectified by D809, D810, then filtered by C817, C822 to generate +12V and +5V

respectively.

9.5 Driver :

Q803 drive T802 from PWM control of I801 for power converted.

9.6 FB :

Negative feedback CKT consists of photo coupler I802 and adjustable regulator I803. It can maintain output

voltages +5V and +12V at a stable level.

9.79.7

PWM :PWM :

9.7

PWM :

9.79.7

PWM :PWM :

9.7.19.7.1

9.7.1

9.7.19.7.1

9.7.29.7.2

9.7.2

9.7.29.7.2

9.7.39.7.3

9.7.3

9.7.39.7.3

Start : When power is turned on, Q801 conducts due to bias from C805 and R805,R803. C807 is charStart : When power is turned on, Q801 conducts due to bias from C805 and R805,R803. C807 is char

Start : When power is turned on, Q801 conducts due to bias from C805 and R805,R803. C807 is char

Start : When power is turned on, Q801 conducts due to bias from C805 and R805,R803. C807 is charStart : When power is turned on, Q801 conducts due to bias from C805 and R805,R803. C807 is char

16 volt and a starting current about 0.3mA to pin 7 of I801. I801 starts to oscillate and outputs a pulse train16 volt and a starting current about 0.3mA to pin 7 of I801. I801 starts to oscillate and outputs a pulse train

16 volt and a starting current about 0.3mA to pin 7 of I801. I801 starts to oscillate and outputs a pulse train

through pin 6 to drive Q803.through pin 6 to drive Q803.

through pin 6 to drive Q803.

through pin 6 to drive Q803.through pin 6 to drive Q803.

OPP : When Q803 turns on, C805 supplies a linearly increasing triangle current through the primary induc-OPP : When Q803 turns on, C805 supplies a linearly increasing triangle current through the primary induc-

OPP : When Q803 turns on, C805 supplies a linearly increasing triangle current through the primary induc-

tance of T802 to the driver Q803, once the peak value of this current multiplied by R81tance of T802 to the driver Q803, once the peak value of this current multiplied by R81

tance of T802 to the driver Q803, once the peak value of this current multiplied by R81

tance of T802 to the driver Q803, once the peak value of this current multiplied by R81tance of T802 to the driver Q803, once the peak value of this current multiplied by R81

pulse train will be turn ofpulse train will be turn of

pulse train will be turn of

pulse train will be turn ofpulse train will be turn of

Regulation : If output voltage +5V goes up, the R terminal of I803 gets more bias, accordingly photoRegulation : If output voltage +5V goes up, the R terminal of I803 gets more bias, accordingly photo

Regulation : If output voltage +5V goes up, the R terminal of I803 gets more bias, accordingly photo

transistor and photo diode flows more current. The voltage of pin 2 goes up too, making the pulse width oftransistor and photo diode flows more current. The voltage of pin 2 goes up too, making the pulse width of

transistor and photo diode flows more current. The voltage of pin 2 goes up too, making the pulse width of

pin 6 to become narrower. So the output voltage +5V will be pulled down to a stable value.pin 6 to become narrower. So the output voltage +5V will be pulled down to a stable value.

pin 6 to become narrower. So the output voltage +5V will be pulled down to a stable value.

pin 6 to become narrower. So the output voltage +5V will be pulled down to a stable value.pin 6 to become narrower. So the output voltage +5V will be pulled down to a stable value.

f immediately to protect Q803, T802 from being burned out.f immediately to protect Q803, T802 from being burned out.

f immediately to protect Q803, T802 from being burned out.

f immediately to protect Q803, T802 from being burned out.f immediately to protect Q803, T802 from being burned out.

1 exceeds1 volt,1 exceeds1 volt,

1 exceeds1 volt,

1 exceeds1 volt,1 exceeds1 volt,

ged aged a

ged a

ged aged a

9.7.49.7.4

9.7.4

9.7.49.7.4

9.7.59.7.5

9.7.5

9.7.59.7.5

OVP : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes larOVP : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar

OVP : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar

OVP : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes larOVP : If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar

over 18 volts, ZD801 conducts, pin 3 of I801 is pulled up over 1 volt. The pulse train at pin 6 goes down toover 18 volts, ZD801 conducts, pin 3 of I801 is pulled up over 1 volt. The pulse train at pin 6 goes down to

over 18 volts, ZD801 conducts, pin 3 of I801 is pulled up over 1 volt. The pulse train at pin 6 goes down to

zero, shutting Q803 ofzero, shutting Q803 of

zero, shutting Q803 of

zero, shutting Q803 ofzero, shutting Q803 of

SCP : If output terminal is short to ground, photo transistor does not conduct, hence Q806 does not conductSCP : If output terminal is short to ground, photo transistor does not conduct, hence Q806 does not conduct

SCP : If output terminal is short to ground, photo transistor does not conduct, hence Q806 does not conduct

eithereither

. Then oscillation of I801 is stop, shutting Q803 of. Then oscillation of I801 is stop, shutting Q803 of

either

. Then oscillation of I801 is stop, shutting Q803 of

eithereither

. Then oscillation of I801 is stop, shutting Q803 of. Then oscillation of I801 is stop, shutting Q803 of

f immediatelyf immediately

f immediately

f immediatelyf immediately

f immediately

f immediatelyf immediately

ge also. Suppose that it isge also. Suppose that it is

ge also. Suppose that it is

ge also. Suppose that it isge also. Suppose that it is

B17AAU Power Board Block Diagram

Line

Filter

Rec. &

Filter

PWM Driver

Power

Transformer

Outpur Rec. & Filter

Circuit Description Index

B17AAU / B17ANU / B17AAY

Table of Contents

1. No display of screen (Screen is black, color of LED is amber) ----------------------------------------------------- 1

2. Nothing displays on screen (Screen is black, color of LED is green) ---------------------------------------------- 2

3. Checking the back light unit --------------------------------------------------------------------------------------------- 5

4. Abnormal screen ---------------------------------------------------------------------------------------------------------- 6

5. Abnormal Auto adjustment ---------------------------------------------------------------------------------------------- 8

5.1 NO OSM display ----------------------------------------------------------------------------------------------------- 8

5.2 OSD Adjust problem ------------------------------------------------------------------------------------------------- 8

6. Abnormal plug and play operation ------------------------------------------------------------------------------------- 9

6.1 Abnormal DDC2 ------------------------------------------------------------------------------------------------------ 9

7. Checking the interface circuit of sync signal -------------------------------------------------------------------------10

7.1 Checking the control circuit of horizontal sync pulse ---------------------------------------------------------- 10

7.2 Checking the control circuit of vertical sync pulse-------------------------------------------------------------- 10

8. Checking the resolution change IC movement -----------------------------------------------------------------------11

9. No power on -------------------------------------------------------------------------------------------------------------- 12

10. Checking the DC/DC converter circuit -------------------------------------------------------------------------------- 13

11. Checking the operation of CPU ---------------------------------------------------------------------------------------- 14

12. Power board --------------------------------------------------------------------------------------------------------------- 15

Index Trouble Shooting

B17AAU / B17ANU / B17AAY

1. No display of screen (Screen is black, color of LED is amber)

Does OSM display when you push

PROCEED button.

When a signal isn't

being inputted, it is indicated with "VIDEO INPUT". It is indicated

with "OUT OF RANGE"

at the time of the

frequency that it can't be

distinguished.

Check if the sync signal from Computer

is output and if the video cable is

Yes

connected normally.

Preceed "No OSM display"section.

Proceed "Checking the resolution change

IC movement" section.

Input the sync signal of computer, or

change the cable.

Trouble Shooting Page 1

B17AAU / B17ANU / B17AAY

2. Nothing displays on screen (Screen is black, color of LED is green)

Is backlight lit?

NG Refer "Checking the backlight unit" section

Does computer output RGB video signals?

Check OSM menu is displayed on screen

when you push the "PROCEED" key.

Proceed "Abnormal screen" section.

Check the video cable for failure. Check the host for

output signal with all black only.

1) Change pattern of video signal output on the host.

2) Reconnect the video cable.

3) Change the video cable.

Check if the LCD video signal cable is connected between the MAIN PWB and LCD module.

Failure Point

The Cable is disconnected.

Page 2 Trouble Shooting

Continue

Check the 3.3 V power are supplied on I323, pin 2.

Check if the voltage on I323 pin 3 that

is high level DC at 5V.

B17AAU / B17ANU / B17AAY

Failure point

I323 Failure

Is a dot clock being outputted under the

condition that a LCD module is

connected to L322 pin 2?

Check the H-sync pulse of negative polarity

is output on RN314 pin 8 at TTL level.

1) Printed wire broke between P310 pin 7, 8 and and I323.

2) Check power board.

Failure point

1) I315 failure

2) Printed wire broke between I315 and L322 pin 2.

Failure point

1) I315 failure

2) Printed wire broke between I315 and RN314 pin 8.

Check the V-sync of negative polarity

are output on RN314 pin 7.

Failure point

1) I315 failure

2) Printed wire broke between I315 and RN314 pin 7.

Trouble Shooting Page 3

Continue

Check the data enable of positive polarity are output on RN314 pin 6.

1) I315 failure.

2) Printed wire broke between I315 and RN314 pin 6.

B17AAU / B17ANU / B17AAY

Failure point

Check the data signal output on I315 R, G, B

Check I319, I320 all LVDS signal pins.

1) The cable broke between P304 and LCD module.

2) LCD module failure.

data pin.

Failure point

1) I315 failure.

Failure point

1) I319, I320 failure.

2) Printed wire broke between I319, I320 and P307.

Page 4 Trouble Shooting

3. Checking the back light unit

Is +12V supplied to inverter PWB?

B17AAU / B17ANU / B17AAY

Check the BKLT_EN signal of the rectangle input P310 pin 2 at TTL high level

Check the PWM signal of the input from I315 pin M4 (R374 pin 2) is a PWM signal.

Failure point

1) Inverter cable disconnection.

2) Power board failure.

Is a "H" level being output in the TTL level from I302 pin 29

Or, is BKLT_EN signal of the rectangle being output?

Failure point

Printed wire broke between

I302 pin 29 and R326.

Failure point

1) Printed wire broke between I315 pin M4 and R374 pin 2.

2) I315 failure.

Failure point

1) Inverter cable disconnection.

2) Inverter of LCD module failure.

Trouble Shooting Page 5

4. Abnormal screen

B17AAU / B17ANU / B17AAY

Check the R, G, B video signal from computer input on

Check the R, G, B input signals on I315 pin E1, D2, C1

Is the pulse of the TTL level being output to I319, I320

Check the negative horizontal sync pulse output to

D-Sub R, G, B connector.

respectively that their level is 0.7Vp-p maximum.

from the data line of I315?

RN314 pin 8 from I315 pin F20 at TTL level.

1) No R, G and B video signal output from host computer. Check computer

2) Video signal cable disconnection.

In the case of the Red signal. (A Green and Blue signal is the same path, too.)

1) Printed wire broke between D-Sub(R) and I315 pin E1.

2) R339 short.

3) C359 open.

4) R337 open.

1) Printed wire broke between I315 data line and I319, I320.

2) I315 failure.

Failure point

Check the negative vertical sync pulse output to RN314

pin 7 from I315 pin F19 at TTL level.

Check the positive DE pulse output to RN314 pin 6 from

I315 pin F18 at TTL level.

Check the SHFCLK OUTPUT to L322 pin 2 from I315 pin

G20 at TTL level.

1) Printed wire broke between I315 pin F20 and RN314 pin 8.

2) I315 failure

1) Printed wire broke between I315 pin 73 and RN314 pin 7.

2) I315 failure

1) Printed wire broke between I315 pin F18 and RN314 pin 6.

2) I315 failure

1) Printed wire broke between I315 pin G20 and L322 pin 2.

2) L321 open

3) C583 short

4) C590 short

5) L322 short

6) I315 failure

Failure point

Page 6 Trouble Shooting

Continue

Check I319, I320 all LVDS signal pins.

B17AAU / B17ANU / B17AAY

Failure point

1) I319, I320 faulure.

2) Printed wire broken between I319, I320 and P307.

Process "Checking the resolution change IC movement"

section.

Trouble Shooting Page 7

5. Abnormal OSM display

5.1 NO OSM display

Check the input of 3.3Vp-p pulse from I315 pin P3, P4, R1, R2, P2, P1.

1) Printed wire broke between I315 pin P3 and I302 pin 5.

2) Printed wire broke between I315 pin P4 and I302 pin 4.

3) Printed wire broke between I315 pin R1 and I302 pin 3.

4) Printed wire broke between I315 pin R2 and I302 pin 2.

5) Printed wire broke between I315 pin P2 and I302 pin 7.

6) Printed wire broke between I315 pin P1 and I302 pin 6.

7) RN301, RN303 open/short.

B17AAU / B17ANU / B17AAY

Failure point

Proceed "Checking the resolution change IC movement" section.

5.2 OSD Adjust problem

Check the input TTL level whether was changed when pressed function keys.

Failure point

1) Printed wire broke between P302 pin 3 and I302 pin 15.

2) Printed wire broke between P302 pin 4 and I315 pin G19.

3) Printed wire broke between P302 pin 5 and I315 pin G18.

4) Printed wire broke between P302 pin 6 and I315 pin L1.

5) Printed wire broke between P302 pin 7 and I315 pin M1.

6) C322, C323, C324, C326, C327 short.

7) RN306, RN307, short/open.

8) I315 failure.

Proceed "Checking the resolution change IC movement" section.

Page 8 Trouble Shooting

6. Abnormal plug and play operation

6.1 Abnormal DDC2

Confirm the output of serial data on I312 pin 6 synchronize SCLK at TTL level.

B17AAU / B17ANU / B17AAY

Failure point

1) The host machine isn't communicating in DDC2 mode.

2) The video cable may have failed or may not to have connections for DDC.

3) Between I312 pin 6 and P304 pin 15 may have failed.

4) R335 open.

5) Cable failure.

Failure point

I312 failure.

Trouble Shooting Page 9

7. Checking the interface circuit of sync signal

7.1 Checking the control circuit of horizontal sync pulse

B17AAU / B17ANU / B17AAY

Check the horizontal sync signal on I315

Process "Checking the resolution change IC

pin L2 TTL level.

movement" section.

1) Video cable may have failed.

2) Printed wire broke between P304 pin 13 and I315 pin L2

3) FB305, R329 open

4) R330, C352 short

7.2 Checking the control circuit of vertical sync pulse

Check the vertical sync signal on I315 pin

K1 TTL level.

Failure point

1) Video cable may have failed.

Process "Checking the resolution change IC

movement" section.

2) Printed wire broke between P304 pin 14 and I315 pin K1

3) FB328, FB304 open

4) R331, C353 short

Failure point

Page 10 Trouble Shooting

8. Checking the resolution change IC movement

Is there +3.3V supply on I315 pin D13, D15, D16, E17, G17, J17, L17, N17, R17, U17, U15, U13,

U12, U10, U8, U6, U5, T4, L4, B2, B6, B7, B8, B9, B11, C3, D3, E3, F2, F4, G1, G3, H1, J1, J3.

Proceed "Checking the DC/DC converter circuit" section.

B17AAU / B17ANU / B17AAY

Is there +2.5V supply on I315 pin D12, D14, D17, F17, K17, M17, P17, T17, U16, U14,

Is 24MHz clock input to I315 pin J4

Is +5.0V supplied to I315 pin T1 at

High level (Reset signal)?

U11, U9, U7, U4, N4, K4, A6, A7, A8, A9, A10, A11.

Proceed "Checking the DC/DC converter circuit" section.

at TTL level?

Is 24MHz clock output from X303

pin 5 at TTL level?

OK NG

Print wire broke between X303 pin 5

and I315 pin J4.

Check the output of 5.0V "H" pulse

from I301 pin 6.

Is +3.3V supplied to X303 pin 8?

Failure point

Failure point X303 failure

Failure point

Print wire broke between and X303

pin 8 and power supply.

Failure point

I315 failure

Failure point

Print wire broke between I301 pin 6

and I315 pin T1.

NG Is 5.0V supplied to I301 pin 7?

Failure point

I301 failure

Failure point

1) I322 failure

2) L315 open

Trouble Shooting Page 11

9. No power on

B17AAU / B17ANU / B17AAY

Check the +5V power is supplied

from power board.

Proceed "Checking the operation of

CPU".

Failure point

Power board failure.

Page 12 Trouble Shooting

10. Checking the DC/DC converter circuit

B17AAU / B17ANU / B17AAY

Check if the 5V is output from P310

Check the output of 3.3V line voltage

Printed wire broke between I323 pin 2 and IC 315 power supply pin.

pin 7, 8.

from I323 pin 2.

Printed wire broke between P310 pin

7, 8 and I323 pin 3.

Is the output FB335 being inputted

to I315 pin 3?

Printed wire broke between I323

Failure point

I323 failure

Failure point

pin 3 and output of FB335.

Trouble Shooting Page 13

11. Checking the operation of CPU

Is there +5.0V supply on I302 pin 44

B17AAU / B17ANU / B17AAY

Is 24MHz clock input to I302 pin 20

and 21 at TTL level?

Check the input of 5V "H" pulse from

I302 pin 10 are same as I306 pin 1.

Printed wire broke between output of FB331 and I302 power supply pin.

1) Printed wire broke between I302 pin 10 and I306 pin 1.

2) I208 failure.

I302 failure.

Failure point

Failure point X301 failure.

Failure point

Page 14 Trouble Shooting

12. Power Board

B17AAU / B17ANU / B17AAY

Check output voltage +5V, +12V is

Check power switch is turn on or not.

P802, P803, CN102, CN103 is connected right or not.

Check C805 is about DC140V~330V

right or not.

Yes

Check power cord (P801), Signal cable (P302),

Yes

or not.

Yes

It is not power board problem

Turn switch on.

Connect it right

Check F801, D801, P801 and repair them.

Check C807 is over 10V or not.

Yes

Check pin 6 of I801 have same

pulse or not.

Yes

Check pin 1 of T802 have same

pulse or not.

Yes

Check peak voltage of R811 triangle

pulse is up to 1 volt or not.

Yes

Check D809, D810, C816, C821, T802 have same

short circuit, or the output +5V, +15V is over load.

Check R805, R803, I801 and repair them.

Check peripheral components of I801 and repair

them.

Check Q803, R813, R814, D806, R812 and

repair them.

Check D804, R807 and repair them.

Yes

Check feedback circuit around I802, I803 and the

other components and repair them.

Repair them

Trouble Shooting Page 15

B17AAU / B17ANU / B17AAY

1. Recommended Parts List

Note: 1. The components identified by   mark are critical for X-ray safety. Replace these with

only the same parts specified.

2. The components identified by  *  mark are critical parts.

3. There is only OTP IC at the model beginning (FPR stage or before). When it put in mass production and there must be Mask coming out. Please checkyou have spart parts need, please check BOM to get the last release part number and related information.

No. Location Part Number Description

1 V002 6711300030 HARNESS 30P 200mm 20276#28-3

2 * V170 6814002100 LCD L170E3 ACER (B17AAU)

3 * V170 6814002600 LCD HT17E11-100 REV=0 HYDIS (B17AAY)

4 D321 6412001778 DIODE MM4148 SMD GOODARK

5 I301 6444006108 IC MOS M51953AFP 8P SOP

6 * I302 6448015548 IC CPU PROM P87C51RD+IA 44P PL

7 I305 6448016508 IC 24LC16B/SN 8P SOP

8 I312 6448018208 IC 24LC02B 8PIN SOP MICROCHIP

9 * I315 6444007608 IC CMOS gm5020 292P BGA GENESI

10 I319 6444007708 IC CPU SN75LVDS83 56PIN DGG TI

11 I321 6442027308 IC Linear Si4431DY 8P SOP

12 I323 6442023326 IC Linear AIC1084 33CM 3P TO26

13 I324 6442028308 IC Linear Si3025LS 8P SOP SANK

14 L302 6855003500 EMI FILTER EF 1T2012 050T C&C

15 X301 6449002650 CRYSYAL 24MHz AT 49 50pp

16 0000 5114600001 CONTROL BD U170ATUAV(99)

17 D600 6418004401 LED LTL 36EDJP 1(Y)3(G) LITEON

18 * INVA 6716009600 INVERTER DC-AC 12V AMBIT (B17AAU)

19 * INVA 6716010000 INVERTER DC-AC 12V AMBIT T151005 (B17AAY)

20 I332 6442023100 IC-LINEAR TDA7496L 20P

21 L332 6111456131 COIL CHOKE 45uH DRWW10x10L

22 00000 5113800003 CONTROL BD for Mecury

23 00000 5113800013 CONTROL BD for Super Mecury

24 00000 5113800002 CONTROL BD for Eureka

Recommended Spare Parts List Page 1

LITE-ON TECHNOLOGY CORP.

5 F, No. 16, Sec. 4, Nanking E. Road, Taipei, Taiwan

Tel: 886-2-25706999 Fax: 886-2-25706888

URL:// www.liteontc.com.tw

Printed in Taiwan

LITE-ON B17AA Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual