JVC LT-52X579 - 52" LCD TV Service Manual Download Page 16 | Manualshive

Page: 16 / 16

JVC LT-52X579 - 52

(No.YA654<Rev.001>)

VPT

Printed in Japan

SECTION 5

TROUBLESHOOTING

5.1

SELF CHECK FUNCTIONS

5.1.1 OUTLINE

This model has a self check function given below. When an abnormality has been detected, the power is turned off and the POWER LED
flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.

5.1.2 SELF CHECK ITEMS

5.1.3 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT

In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.

<Explanation of operation>

If an error is detected, the power is turned off.
Shortly after the power is turned off, the POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after the power is turned off.

Detection item

Detection content

Diagnosis

signal (line)

Detection timing

Low bias line
short protection

Confirm the operation of the low bias (3.3V/5V/
12V/24V) protection circuit.
3.3V:

Q7004

[SIGNAL PWB]

5V:

Q7003

[SIGNAL PWB]

12V:

Q7001

[SIGNAL PWB]

24V:

IC7019

[SIGNAL PWB]

LB_PRO

At 10 seconds after the power is turned on, the
self-check function starts. If NG is detected during
3000ms, the power is turned off automatically.

Type of error

POWER LED flash cycle

Low bias line short protection

LED turning on and off at 2 seconds intervals.

Victor Company of Japan, Limited

Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan

«
...
14
15
16

Summary of Contents for LT-52X579 - 52" LCD TV

Page 1: ...TROUBLESHOOTING 1 16 MODEL NO RATING LABEL REAR MODEL NO LABEL SIDE KAA VERSION LT 52X579 MODEL NAME There may be multiple versions of this TV model The TV version is identified by the letters next to the model number on the TV s Rating and Model No labels See illustration Use the service manual that matches the version of the TV BASIC CHASSIS FN3 No YA590 LT 32P679 No YA589 LT 42P789 No YA591 LT ...

Page 2: ...ower Output 10 W 10 W Speaker 4 0 cm 16 0 cm oval type Oblique corn 2 Antenna Terminal VHF UHF ATSC DIGITAL CABLE IN F type connector 75Ω unbalanced coaxial 1 Digital Input INPUT 1 2 3 Digital Video Audio HDMI 2 row 19pin connector 3 Digital input terminal is not compatible with picture signals of personal computer Video Supported format 1080p 1080i 720p 480p 480i Audio 2ch L PCM 32 44 1 48 KHz 16...

Page 3: ...onents that indicate evidence of overheating should be replaced Always use the manufacturer s replacement components 6 Isolation Check Safety for Electrical Shock Hazard After re assembling the product always perform an isolation check on the exposed metal parts of the cabinet antenna terminals video audio input and output terminals Control knobs metal cabinet screw heads earphone jack control sha...

Page 4: ...acked To prevent accidents from occurring during transportation pay careful attention before delivery such as through explaining the handling instructions to transporters Ensure that the following requirements are met during transportation as the LCD panel of this unit is made of glass and therefore fragile 1 USE A SPECIAL PACKING CASE FOR THE LCD PANEL When transporting the LCD panel of the unit ...

Page 5: ...TIONS FOR REPLACEMENT OF EXTERIOR PARTS Take note of the following when replacing exterior parts REAR COVER FRONT PANEL etc 1 Do not exert pressure on the front of the LCD panel filter surface It may cause irregular color 2 Pay careful attention not to scratch or stain the front of the LCD panel filter surface with hands 3 When replacing exterior parts the front LCD panel should be placed facing d...

Page 6: ...with the brightness twice as brighter as originally lighting For checking this pixel fault input 100 of each R G B color and find out the cell that is not lighting FLICKER FAULT In the pixel fault a cell that should light originally or not light originally is flashing on and off For checking this pixel fault input ALL BLACK SCREEN signal or 100 of each RGB color and find out the cell that is flash...

Page 7: ...46 P4_6 Not used 47 NF_CNTL2 I Not used 48 NF_CNTL1 I Not used 49 P4_3 Not used 50 P4_2 Not used 51 EDID_WP O Programming control for EDID ROM Protection H 52 NF_PPON O Not used 53 NF_OC O Not used 54 DET_NF I Not used 55 PFC_POW O Power on off control for PFC On L 56 CTL_SW O Not used 57 HP_DET I Not used 58 HP_WDOG I Watch dog reset for main CPU 59 P3_1 Not used 60 VCC2 3 3V power supply 61 P3_0...

Page 8: ...2 3 REMOVING THE POWER PWB Fig 3 1 Remove the POWER CORD Remove the REAR COVER Remove the BACK BRACKET 1 Remove the 13 screws F 2 Remove the POWER PWB 3 2 4 REMOVING THE SIGNAL PWB Fig 3 1 Remove the REAR COVER Remove the BACK BRACKET 1 Remove the 2 screws G 2 Remove the TERMINAL BRACKET 3 Remove the 8 screws H 4 Remove the SIGNAL PWB 3 2 5 REMOVING THE SW PWB Fig 3 1 Remove the REAR COVER 1 Remov...

Page 9: ...Y Y Y Y Z Z Z Z X X L L L L a a B B REAR COVER STAND BOTTOM FRAME SIGNAL PWB MAIN BASE SIDE BRACKET TERMINAL BASE POWER PWB SW PWB CONTROL KNOB LED PWB SPEAKER FRONT PANEL LCD PANEL UNIT SPEAKER POWER CORD POWER CORD COVER SIDE BRACKET PANEL BRACKET PANEL BRACKET TOP BRACKET TOP BRACKET BACK BRACKET BACK BRACKET ...

Page 10: ...RATING INSTRUCTIONS USER S GUIDE and set the items as described 6 SERVICE MODE setting Verify what to set in the SERVICE MODE and set whatever is necessary Fig 1 Refer to the SERVICE ADJUSTMENT for setting 3 3 3 SERVICE MODE SETTING ITEMS Fig 3 4 Simbol Number of pins Mounting PWB Main content of data IC2001 8 pin SIGNAL PWB Setting data of HDMI 1 is memorized IC2004 8 pin SIGNAL PWB Setting data ...

Page 11: ... 1080i p Full SLEEP OFF VIDEO STATUS Dynamic SOUND STATUS Speech Setting item STANDARD DYNAMIC GAME THEATER Tint 46 47 46 47 Color 80 90 80 74 Picture 50 52 48 48 Bright 36 36 36 40 Detail 35 50 35 0 Backlight 50 100 50 10 Color Temp Natural Cool Cool Warm Color Management On On On Off Dynamick Gamma On On Off Off Smart picture On Off On On Digital VNR Low Low Low Low MPEG NR On On On On Natural C...

Page 12: ...Opacity Default Edge Color Default Tuner Mode Cable Edit Channel Setting Ch Page V Chip Do Not Block Setting item Setting position MTS Stereo Digital Audio ML English Surround Off Sound Status Speech STEP 100Hz 330Hz 1kHz 3 3kHz 10kHz USER 0 0 0 0 0 SPEECH 0 2 5 6 2 JAZZ 6 0 2 2 3 CLASSIC 5 3 2 2 3 ROCK 8 3 0 2 3 Setting item Setting position Sleep Timer Off Power Indicator High Illumination High ...

Page 13: ...ith the tweezers and remove the chip part Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alternately melt the solder at each lead Shift and remove the chip part NOTE After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern ...

Page 14: ...4 3 MEASURING INSTRUMENT AND FIXTURES Signal generator Pattern generator NTSC Remote control unit 4 4 SERVICE MODE 4 4 1 HOW TO ENTER THE SERVICE MODE 1 Set to OFF using the SLEEP key 2 While OFF is displayed press the V STATUS key and DISPLAY key simultaneously 3 Enter the SERVICE MODE Fig 4 1 4 Select the 2 White balance base from the SERVICE MODE Fig 4 1 4 4 2 HOW TO EXIT THE SERVICE MODE Press...

Page 15: ...00 0 G Offset 100 100 0 B Offset 100 100 0 3 M16 EEPROM EDIT Do not adjust 4 I2C Stop 5 Version Item Measuring instrument Adjustment part Description WHITE BALANCE HIGHLIGHT Remote control unit Signal generator 2 White balance Base R Gain Red Gain G Gain Green Gain B Gain Blue Gain R Offset Red Offset G Offset Green Offset B Offset Blue Offset 1 Receive a NTSC 75 all white signal 2 Set VIDEO STATU...

Page 16: ... off Shortly after the power is turned off the POWER LED will be blinked Power cannot be turned on until the power cord takes out and inserts after the power is turned off Detection item Detection content Diagnosis signal line Detection timing Low bias line short protection Confirm the operation of the low bias 3 3V 5V 12V 24V protection circuit 3 3V Q7004 SIGNAL PWB 5V Q7003 SIGNAL PWB 12V Q7001 ...

Reviews:

No comments