Electro help: LG 42PJ250-UA, LG42PJ250-UB Plasma TV Service mode, alignments, troubleshooting and Digital audio section schematic

Applicable to all of the PU01A Chassis.

(1) Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of 25 degree C ± 5 degree C of temperature and 65 % ± 10 % of relative humidity if there is no specific designation.
(4) The input voltage of the receiver must keep 100 V ~ 240 V, 50 / 60 Hz.
(5) The receiver must be operated for about 5 minutes prior to the adjustment when module is in the circumstance of over 15 degree C.
- In case of keeping module is in the circumstance of 0 degree C, it should be placed in the circumstance of above 15 degree C for 2 hours.
- In case of keeping module is in the circumstance of below -20 degree C, it should be placed in the circumstance of above 15 degree C for 3 hours.
1) Press the POWER ON KEY on Remote control for adjustment.
2) Press the ADJ KEY on Remote control and enter EZ ADJUST. Select “4.

WHITE PATTERN” by using (CH +/-) and select “White” by using (VOL +/-)

- Set is activated HEAT run without signal generator in this mode.
- Single colour pattern (RED / BLUE / GREEN) of HEAT RUN MODE uses to check panel. [If you turn on a still screen more than 20 minutes (Especially digital pattern, cross hatch pattern), an after-image may be occur in the black level part of the screen.]

PCB assembly adjustment method.
* Caution: Set up “RF mode(noise)” after PCB assembly adjustment.
*Download
(1) Execute ISP program “Mstar ISP Utility” and then click “Config” tab.
(2) Set as below, and then click “Auto Detect” and check “OK” message. If display “Error”, Check connect computer, jig, and set.
(3) Click “Connect” tab. If display “Can’t ”, Check connect computer, jig, and set.

(4) Click “Read” tab, and then load download file(XXXX.bin) by clicking “Read”.

(5) Click “Auto” tab and set as below.
(6) Click “Run”.
(7) After downloading, check “OK” message.

Auto ADC Process (using DFT).

PC (for communication through RS 232C)

UART Baud rate: 115200bps.

Command: aa 00 00 (Start factory mode).Command : ad 00 10 (working Auto ADC).Command : aa 00 90 (End of Auto ADC Process).

Manual ADC Process using Service Remocon.
After enter Service Mode by pushing “ADJ” key, execute “ADC Adjust” by pushing “>” key at “0. ADC CALIBRATION”.

Confirmation.

(1) We confirm whether “0xBF(480i)/0xC8(1080i)” address of EEPROM “0xA2” is “0xAA” or not.

(2) If “0xBF(480i)/0xC8(1080i)” address of EEPROM “0xA2” isn’t “0xAA”, we adjust once more.
(3) We can confirm the ADC values from “0xB9 ~ 0xBE(480i) or 0xC2 ~ (1080i)” addresses in a page “0xA2”.
* Manual ADC Confirmation using Service Remocon.

After enter Service Mode by pushing “INSTART” key,

Total Assembly line process.
* Caution : Each PCB assembly must be checked by check JIG set.(Because power PCB Assembly damages to PDP Module, especially be careful)
* Caution: Set up “RF mode(noise)” before voltage adjustment.
POWER PCB Ass’y Voltage adjustment (Va, Vs voltage adjustment)
(1) Test equipment : D.M.M 1EA
(2) Connection Diagram for Measuring : refer to fig.

Adjustment method
(1) Vs adjustment (refer fig.)
1) Connect + terminal of D.M.M. to Vs pin of P812(42”:P811), connect -terminal to GND pin of P812(42”:P811).
2) After turning VR901, voltage of D.M.M adjustment as same as Vs voltage which on label of panel left/top. ( deviation ; ±0.5V)
(2) Va adjustment (refer fig.)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M. to Va pin of P812(42”:P811), connect -terminal to GND pin of P811(42”:P812).
3) After turning VR502,voltage of D.M.M adjustment as same as Va voltage which on label of panel left/top. (deviation; ±0.5V)

DDC EDID Write MODEL NAME: LG TV (Not necessary)
Caution: Please only check write status in Instart-menu
Manual Download(using DFT)
PC(for communication through RS-232C), UART baud rate: 115200 bps. Command : aa 00 00 (Start Factory mode). Command : ae 00 10 (Download All EDID). Command : aa 00 90 (End of Factory mode)

Manual EDID D/L using Service Remocon.
(1) After enter Service Mode by pushing “ADJ” key, select “4.EDID D/L”.
(2) Finally execute “START” by pushing “>” or “9”key.

Data

Adjustment of White Balance.
Caution: Press the POWER ON KEY on R/C before W/B adjustment.
Test Equipment
- Color Analyzer(CS-1000, CA-100+(CH.10), CA-210(CH.10) ) [ Please adjust CA-100+ / CA-210 by CS-1000 before measuring --> You should use Channel 10 which is Matrix compensated (White, Red, Green, Blue revised) by CS-1000 and adjust in accordance with White balance adjustment coordinate.

Connecting Picture of the Measuring Instrument (On Automatic control ).
Inside PATTERN is used when W/B is controlled. Connect to auto controller or push control R/C ADJ Key Enter the mode of White-Balance, the pattern will come out.

Auto-control interface and directions.
(1) Adjust in the place where the influx of light like floodlight around is blocked. (illumination is less than 10ux).
(2) In case of PDP: Measure and adjust after sticking the Color Analyzer (CA-100+, CA210 ) to the side of the module.
In case of LCD: Adhere closely the Color Analyzer (CA210) to the module less than 10cm distance, keep it with the surface of the Module and Color Analyzer’s Prove vertically.(80~100°).
(3) Aging time.
1) After aging start, keep the power on (no suspension of power supply) and heat-run over 5 minutes.
2) In case of PDP, keep white pattern using inside pattern.
3) In case of LCD, using ’no signal’ or ‘full white pattern’ or the others, check the back light on.

Manual white Balance.
(1) Press the POWER ON KEY on R/C for adjustment and heat run over 5 minutes.
(2) Zero Calibrate CA-100+ / CA-210, and when controlling, stick the sensor to the center of PDP module surface.
(3) Press the ADJ KEY on R/C and enter EZ ASJUST Select “3.W/B ADJUST” and press ENTER(V)
Set test-pattern on and display inside pattern.
(4) Control is carried out on three color temperatures, COOL, MEDIUM, WARM.(Control is carried out three times)
< Temperature: COOL >
- R-offset / G-offset / B-offset is set to 128
- Control R-Gain and G-Gain.
- Each gain is limited to 192.
< Temperature: MEDIUM >
- R-offset / G-offset / B-offset is set to 128
- Control R-Gain and G-Gain.
- Each gain is limited to 192.
< Temperature: WARM >
- R-offset / G-offset / B-offset is set to 128
- Control G-Gain and B-Gain.
- Each gain is limited to 192.

HDCP SETTING (Not necessary)
Caution: Key is saved in external EEPROM.

RS-232C
Press In-start key and select 4.Baud Rate menu. Check RS- 232C after changing Baud Rate 115200.

TOOL OPTION.
Using DFT(Auto).
PC (for communication through RS-232C) UART Baud rate : 115200 bps.

Setting Manual.
Press ADJ R/C In-start key and select 0.TOOL OPTION, Select Model Number by using R/C number(0~9) key or select Model Number by using (VOL +/-) in accordance with destination.
Finally press (enter) key.