Xoceco LC-19HU5610UAE Schematic

LCD TELEVISION

LC-19HU56S

CONTENTS

Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………………… Method of software upgrading…………………………………………………………….. Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………………………. Troubleshooting guide ………………………………………………………………..…… Schematic diagram………………………………………………………………………… APPENDIX-A: Assembly list APPENDIX-B: Exploded View

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Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points carefully.

Safety precautions

1. Instructions

Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire. Anti static measures must be taken (throughout the entire manufacturing process!): a) Do not touch here and there by hand at will; b) Be sure to use anti static electric iron; c) It’s a must for the welder to wear anti static gloves. Please refer to the detailed list before replacing components that have special safety requirements. Do not change the specs and type at will.

2. Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to use the screen of the original model for replacement.

2.2 Be sure to take proper measures in protecting yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not touch the circuit or the metal part of the module that is in operation mode. Relevant operation is possible only one minute after the power is switched off.

2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or damage to the set.

2.4 Never operate the set or do any installation work in bad environment such as wet bathroom, laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into the module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at once. Likewise, if the screen is not working after the power is on or in the course of operation, the power must be cut off immediately and no more operation is allowed under the same condition.

2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.

2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for all the parts that have to be grounded.

2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen would be unable to work and no way to get it repaired. If the connection wires, connections or components fixed by the thermotropic glue need to disengage when service, please soak the thermotropic glue into the alcohol and then pull them out

in case of damage.

2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual. For prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one place. The ambient conditions are tabulated as follows:

Temperature Scope for operation 0 ~ +50 oC

Scope for storage -20 ~ +60 oC

Humidity Scope for operation 20% ~ 85%

Scope for storage 10% ~ 90%

2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenomenon doesn’t represent failure. This “ghost shadow” may remain in the picture for a period of time (several minutes). But when operating it please avoid displaying still picture in high brightness for a long time.

3. Points for attention during installation

3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.

3.2 For service or installation it’s necessary to use specified screw lest it should damage the screen.

3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between the screen and the glass will affect the receiving and viewing effect

3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and insulation please take care to keep it in intactness so as to avoid hidden trouble.

3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

Alignment instructions

1. Test equipment

PM5518 (video signal generator) VG-848 (VGA, HDMI signal generator) VG-849 (digital video signal generator) CA210 (color analyzer)

2. Power test

Connect main board, power board and IR board according to the wiring diagram, connect the power and press “standby” to turn on the TV. Measure the pin voltage of XB1, the data is shown in table1:

Table1 voltage data of XB1

XB1 Pin1 Pin2/4/7/8/13 Pin3 Pin5/6 Pin12 LC-19HUXX LC-22HUXX

4.75 V～5.25 V

3. Alignment flow-chart

The alignment flow-chart is shown as fig-1

Check DDC, FLASH, HDCP and power control IC

Combined test for general assembly

IF channel AFT voltage of TV and AGC voltage adjustment

4. Alignment instruction

4.1 Unit adjustments Connect all the boards according to wiring diagram, then power on and observe the display. Method for entering factory menu: press “INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust value items, press “MENU” repeatedly to exit. Method for software upgrading: When software upgrading please enter factory menu first, select ISP from OPTION, set ISP to 1 and you can begin to upgrade. Af ter upgrade finished, it needs to set

GND

4.75 V～5.25 V 11.4 V～12.6 V 28.8 V～35.2 V

Factory initialization setup

White balance adjustment

Performance check

Preset ex-factory

Fig-1 Alignment flow-chart

ISP back to 0. If the picture can’t display when upgrading, it needs to solder JB1 on main board. Please unsolder JB1 again after upgrading.

4.2 Initialization Enter factory menu, select “OPTION”, “EEPROM” and “HOTEL OPTION” sub-menu, for adjusting items see table 4.

Table 4 sub-menu adjustment

Items Preset Remarks

HOTEL 0 1: HOTEL OPTION of factory menu is optional

0: HOTEL OPTION of factory menu is not optional

LOGO 1 1: display LOGO in no signal or turn on

0: no LOGO display ADC PRESCALE 046 Software will preset the data according to different status. SIF PRESCALE 02E Software will preset the data according to different status. BACK LIGHT FF Software will preset the data according the type of panel ALL COLOR 1 1: white balan ce of each channel auto offset based on the HDMI white

balance

0: white balance of each channel adjust the offset base separately

Note: don’t set ALL COLOR to 1after the offset adjustment, if you do so, the

adjusted parameter of each channel will recover to the parameter of HDMI. EEPROM-MEMORAY RECALL

> EEPROM Initialization (operate when EEPROM data chaos)

4.3 Adjustment for AFT voltage and AGC voltage of IF channel in TV

4.3.1 IF AFC adjustment Disconnect J1(B face), input 38.9MHz PAL signal of 80dB to the pole of J1 near L1 1, Adjust L5

to value 1.25V of TP2. Enter factory menu, adjust TDA4470 from BG to LL, input 33.9MHz SECAM signal of 80dB, adjust R71 to value 1.25V of TP2 then solder J1.

4.3.2 IF AGC adjustment

Input 184.25MHz(PAL/BG) RF signal of 60dBuv to RF terminal, adjust R64 to value 3.75 V±

0.25 V of TP4 and there should be no obvious snowy picture. Increase the signal to 90dBuv and it

should be display normally and no obvious noise.

4.4 White balance adjustment

4.4.1 white balance adjustment of HDMI

a. Input VG-849 signal from HDMI: TIMING854 (800* 600/60Hz) and eighth-level gray scale

signal of PAT920. Use color analyzer CA210 to adjust white balance.

b. Enter submenu of COLOR TEMP, Select 9300k of color temperature

c. Fix value of B OFF, adjust R OFF and G OFF, let the color coordinate of the second level be (285, 293) and the brightness be about 3nit-6nit. Fix value of B GAIN, adjust R GAIN and G GAIN, let the color coordinate of the seventh level be (285, 293). Adjust R OFF, G OFF, R GAIN and G GAIN repeatedly until the value of the two levels gray-scale are (285, 293).

4.4.2 VGA/YPBPR/AV white balance check and correct

a. Connect VG-848 signal of VGA to VGA terminal: TIMING854 ( 800 x 600 / 60Hz) (PATTERN:CROSS) and auto adjust to full screen, then input PAT948 black/white signal, enter factory menu ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, enter COLOR TEMP menu and set ALL COLOR to 0 and fine adjust according to the method of 4.4.1c)

b. Connect VG-848 signal of YPBPR to YPBPR terminal and input TIMING972(1080i/60HZ) 100% color bar of PAT976(include black/white bars), Enter ADC ADJ submenu, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according to the method of 4.4.1c)

c. Connect AV signal (PM5518, 8 gray levels, NTSC) to VIDEO1 terminal, check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according to the method of 4.4.1c)

Note: it can’t set back to 1 once ALL COLOR changes to 0.

5. Performance check

5.1 TV function Enter searching menu → auto search, connect RF-TV terminal with central signal source and check if the picture is normal, if there are channels be skipped. Check TXT and parental control.

5.2 A V, YPbPr terminals Input AV/S, YPbPr/YCbCr HD signal, check if the picture is normal.

5.3 VGA terminal Insert VGA terminal, input VGA format signal of 640x480@60 Hz and check if the display is normal.

5.4 Check sound channel Check the speaker of each channel.

5.5 Other function check Check the ON/OFF timer, sleep timer, picture/sound mode, OSD, freeze/mute, stereo, etc.

5.6 Presetting before ex-factory

Item Setting Item Setting Item Setting

PICTURE MODE STANDARD BALANCE 50 OSD LANGUAGE English COLOR MODE NORMAL VOLUME 50 OSD HPOSITION 50 NR WEAK SLEEP TIMER OFF OSD VPOSITION 50 ZOOM FULL TTX LANGUAGE WEST OSD HALFTONE 50 SOUND MODE STANDARD BLUE SCREEN OFF OSD DURATION 15 AVC OFF WSS OFF

6. Software instruction

No.

Code No.

Software instruction

Function

Type

Flash written before paste

Method

NS14 5270008001 ATMEGA8L Power management IC Yes

NS3 5272540003 EN25F40 NA3(NB3) 5272402002 24C02N-10SI27 HDMI EDID Yes

NB3(NB7)

NS5 5272404002 24C04N-10SI27 HDMI HDCP Yes

NS1 5272432001 AT24LC32A/SN

5272421001

(5272402002)

24LCS21A/SN

(24C02N-10SI27)

Main CPU program

VGA EDID Yes

Store some important information

Yes

Written with instrument like ALL11

Unnecessary to

write

6.2 Main CPU software burn-in need write-protection, below is the setting:

6.2.1 If use ALL - 100:

a) Enter into AUTO interface, select Config. Make sure Config must be selected when burn-in Flash. b) Click Config Setting, set Protect item to All Protect, set SRWD item to Enable, then click OK, write-protection setting is finished. Every time when exit from ALL-100 burn-in program, if want to enter again, the above two steps’ setting must be done again.

If SRWD item is not available, please upgrade ALL-100 burn-in program.

6.2.2 If use Mstar on-line burn-in tool

6.2.2.1 Open the tool, click Device.

a) Select WP Pin pull to high during ISP b) Select New Setting Below.

c) Select Status Register Bit2 Bit3 Bit4 Bit7. Now write-protection setting is

finished.

6.2.2.2 When do on-line upgrade, firstly make sure to confirm write-protection is set correctly.

Method of software upgrading

1. The tools and software demanded

1) Please confirm that PC has the software of ISP_TOOL and install the parallel interface drive program Port95nt.

2) ISP_TOOL icon is bellow:

3) One parallel cable (25 pins) and one VGA cable (15 pins), t he p arallel cable connect s the PC and the upgrade instrument, the VGA cable connects the TV and the upgrade instrument.

2. The steps for upgrading software

1) Please confirm that the connection wires and the upgrade instrument are connected well before the software written and then power on the TV.

2) Double click the icon ISP_TOOL to open it:

3) Press “Connect“ to connect TV, if the connection is done successfully as shown below, then press “enter”.

Note: if it appears error, check the connection wires and check if ISP item of the factory menu is set to 1, if not, please set it to 1.

4) After connection is done, it needs to read the Binary document. Press “Read” as shown below:

5) Search the document needed to write in the “Read” check box.

Select

6) Select the document then the window will appear as shown below:

7) Press “Auto” to select the writing function.

Select the items shown in the picture above: (a) Read File

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