Instruction/ maintenance manual of the product T730BH LG Electronics
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COLOR MONIT OR SER VICE MANUAL Website:http://biz.LGservice.com E-mail:http://www .LGEservice.com/techsup.html CAUTION BEFORE SERVICING THE UNIT , READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL: T730BH(K) (T730BHKL-K***E*) CHASSIS NO. : CA-136 (T730SHKL-K***E*) ( ) **Same model for Service *Same looking with new chassis.
1. PICTURE TUBE Size : 17 inch DefIection Angle : 90¡ Neck Diameter : 29.1 mm Stripe Pitch : 0.25 mm Face Treatment : W-ARASC (Anti-Reflection and Anti-Static Coating) Internal : Anti-Glare 2. SIGNAL 2-1. Horizontal & Vertical Sync 1) Input Voltage Level : Low=0~1.
SAFETY PRECAUTIONS - 3 - SAFETY-RELATED COMPONENT WARNING! There are special components used in this color monitor which are important for safety. These parts are marked on the schematic diagram and the replacement parts list.
- 4 - SER VICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication.
- 5 - General Soldering Guidelines 1 . Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500 F to 600 F. 2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.
- 6 - Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered.
- 7 - TIMING CHART * No Composite Mode. H 37.50 26.67 20.32 6.35 0.51 2.03 3.81 V 74.99 13.335 12.802 0.533 0.026 0.08 0.427 H + 46.88 21.33 16.16 5.17 0.32 3.223 V + 75.01 13.331 12.798 0.533 0.021 0.064 0.448 H + 53.68 18.63 14.22 4.41 0.57 1.14 2.70 V + 85.
- 8 - D I S A S S E M B L Y 1 . T IL T / S W I V E L & B A C K C O V E R R E M O V A L 1 ) S e t t he m onit or fa c e downwa r d. 2 ) C a re fully re mov e t he T i lt / S wive l by pulli ng it upwa rd. 3 ) Remove t he screw ( b ) , B a c k c o v e r b y p u s h i ng i t u p w a r d .
WIRING DIAGRAM - 9 - P501 P201 P405 P301 P302 G2 P702 P701 T1 P402 P902 S + S Signal Cable AC Socket FBT P203 P202 P220 P904.
BLOCK DIAGRAM - 1 0 - Po wer I n p u t 100~240 V A C (50/ 60H z ) L i n e F i l ter D eg au ssi n g C i r c u i t [ OS D Con t rol ] SM PS C o n trol (I C 901) T I L T C o n trol C i r cuit 6.
DESCRIPTION OF BLOCK DIAGRAM - 11 - 1. SMPS(Switching Mode Power Supply) When you turn on the power switch, the operating fprocedure is as follows: . 6. X-RAY Protection Circuit When the high Voltage reaches to 29kV in an abnormal case, the high voltage detector circuit, R818,D721,C739-1 R416, C409 start operation to shut down high voltage circuit.
- 1 2 - 15. Video Pre-Amp Circuit. This circuit amplifies the analog video signal from 0~0.7 V to 0~4 V. It is operated by taking the clamp, R,G,B drive and contrast signal from the MICOM (IC401) 16.
1. Preparation for Service Adjustment GENERAL INFORMATION All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several adjustments may be required. Adjustment should be following procedure and after warming up for a minimum of 30 minutes.
- 14 - 4. Distortion Scanning frequency : All Mode (Mode 1~4) Display image : Crosshatch pattern Horizontal : 10 Row Vertical : 8 Row A-B 2.0mm, C-D 2.0mm E-F 2.0mm, G-H 2.0mm 5. Displa Size drift 4mm : 25 Standard, 10 35 0.5mm : 180V ~ 264V 6. Linearity Formula : (Max - Min) / Max x 100(%) Criteria : H - 10% Max.
11-2. Adjustment of White Balance After finishing adjustment of cut off (back raster), approve "Color(15.0) Full white pattern". Adjust BDRV Data = 85 SCON=127. Adjust RDRV and GDRV to set chromaticity diagram at : x: 0.283 0.005 y: 0.298 0.
- 16 - 3. Adjustment Using Service software Program (Adjustment Program) 1. Adjustment for Factory Mode (Preset Mode). 1) Display cross hatch pattern at Mode All. 2 ) Run alignment program for T730BHKL/T730SHKL on the IBM compatible PC. 3) EEPROM → ALL CLEAR → Y(Yes) command.
4 . E D ID D a t a E d i t Us i n g S e r v ice s o ft w are P r ogram 4 . 1 R ead a n d M o d i f y E D I D D a ta 1) Connec tor the moni tor and adj ust device as Figure1 2) Display color 15,0 cross ha tch pattern at Mode 4. 3) Use EDIT – M ODEL SEL.
- 1 8 - - 18 - 22 0 IBM Compatible PC PARALLEL PORT Power inlet (required) Power LED ST Switch Power Select Switch (110V/220V) Control Line Not u se d RS 2 3 2 C PA RALLEL V- SY NC POWER ST VG S MO N I T O R E V-Sync On/Off Switch (Switch must be ON.) F A B C E F A B C 15 10 5 5 6 9 1 1 1 14 13 25 6 5V 5V 5V 4.
1 2 CHECK D900 BRIDGE DIODE? CHECK C908(+) VOLTAGE 145VDC at 110V input 310VDC at 220V input IC901, Q901 CHECK D971, D961, D951, D904 D941, D942, D906 ? CHECK FUSE OK?(F901) - 19 - TROUBLESHOOTING GUIDE 1.
26 2. NO CHARACTER NO CHARACTER NO NO NO NO TROUBLE IN CDT SOCKET TROUBLE IN P301, SIGNAL CABLE, PC SIGNAL TROUBLE IN IC302, P301 TROUBLE IN IC303 TROUBLE IN IC304 YES YES YES YES - 2 0 - CHECK IC302 .
CHECK SCREEN CONTROL KNOB OF FBT CHECK VOLTAGE AT D961 CATHODE (50V) D971 CATHODE (80V) D951 CATHODE (13V) D941 CATHODE (6.3V)? CHECK IC401 (MICOM) PIN 16 5V (HIGH), IC401 PIN 18 PIN20, PIN21 CHECK POWER INDICATOR GREEN or FLASH ? - 21 - 3.
CHECK IC601 PIN 7 (45V)? CHECK IC401 PIN 33, 34 (SAWTOOTH WAVE)? CHECK IC601 Pin 3 (13V) ? - 22 - 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) NO NO NO TROUBLE IN IC601, V-CIRCUIT T.
3 CHECK IC401 PIN 45, 46 WAVEFORM? CHECK IC401 PIN , 50 ? CHECK Q941,Q951 CHECK IC401 (MICOM) PIN 52, 53 (H/V INPUT) SIGNAL? - 23 - 5. TROUBLE IN DPM 4 Stand-by/SUSPEND/ DPMS OFF MODE FAILURE INPUT H/.
CHECK Q953 COLLECTOR VOLTAGE (0.5V)? CHECK P902? CHECK RL901? CHECK IC401 PIN 4 (5V)? 6. NO DEGAUSSING NO DEGAUSSING NO NO NO NO TROUBLE IN TH901, DEGAUSSING COIL TROUBLE IN IC401 (MICOM) TROUBLE IN D.
5 18 20 21 19 Q705 drain waveform is right? Q706 base, collector waveforms are right? Q719 drain waveform is right? IC401 Pin 18 waveform is right? - 25 - 7. H_Deflection Failure NO NO NO NO 1. Check IC401 Pins 39,40,41 2. Replace IC401. Check Q720,50V LINE D710 Check Q704 Check 1 3V line .
- 26 - 9. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK IC401 PIN 11, 12,13 CHECK Q711~Q716? CHECK L703? TROUBLE IN IC401 (MICOM) TROUBLE IN Q711 ~ Q716 TROUBLE IN L703 TROUBLE IN C722, C723, C726, C729 NO NO NO YES YES YES Cs SIGNAL TABLE HORIZONTAL FREQUENCY(fH) 30K ~ 33.
Check if AC Voltage of IC401 Pin 35 waveform is Variable T701 pin 2 voltage is change with H frequency? The Voltage waveform Q706 Collector is right? - 2 7 - 10 . Abnormal H_Size NO NO Repeat the troubleshooting Guide of H_deflection failure. Check D/D converter circuit Check IC401 B+ control circuit.
8 9 9 8 Q501 Emitter output varies with different DAC values? IC401 Pin 33, 34 output varies with different DAC values? IC401 Pin 26 output duty varies with different DAC values? 13. T ilt Failure Check tilt connector connection Check and replace CRT.
Q706 collecter waveform is right? 15. High V oltage Failure NO NO Replace T701 Check Q719,Q720 Check 50V line Repeat the troubleshooting Guide of H_deflection failure. YES YES 16. ABL Failure YES NO Check and replace CRT Input full white pattern to monitor.
22 23 Some parts around T701 are right? IC401 Pin 24 output are right? Q710 and parts around are right? 17. Focus Failure NO NO NO Check the connection between FBT Pin 12, CRT Socket PCB. Check and replace IC401. Waveforms Replace failed part. Replace failed part.
3 4 4 3 IC401 Pin 23 input is High Active? All in/output values are right? IC401 Pin 45 and 46 inputs are right? IC401 Pin 16 input is over 4.2V? 18. Micom Failure 19. OSD Failure NO NO NO NO Done. Change IC302 Check Q903,D908,ZD902 Check X401 Check and replace R451,C408 Replace IC401.
Proper Video levels are on P301 Pin 1, 3 and 5. IC401 Pins 27 and 28 inputs are right at each function? 20. User Control Failure Check connector Ass ’ y. NO Done. Check and replace IC401. Check and replace function key. YES 21. Missing Color NO Change the CRT.
Blank pedestal is on Pin 19, 20 and 21 of IC302 Is V_FLB and DC_bias on G1 Pin at CRT socket? G2 voltage is right? 22. V isible Retrace Check white balance adjustment. NO NO NO Done. Check G2 control volume and FBT. Check IC302 and related components.
Improved focus? Adjust Pole4,Pole6 to improve the misconvergence 24. Misconvergence Degauss the CDT Done. Change CRT and readjust convergence. Yes Done No 25. Poor Focus Adjust focus VR. Check focus leads from FBT to CRT Socket. Check the CRT Socket. YES Aging monitor and check for focus change.
EXPLODED VIEW - 3 5 - 10 12 12 13 11-2 11-1 7 B A 2 6 5 a b b 1 d 15 14 15 3 9 c 8.
EXPLODED VIEW PARTS LIST - 36 - Description CDT(CIRC), M41QEE903X 21 NDDP LG-PHILIPS 85KHZ 29.1MM FCDT TCO PLUS (T730BHKL) TILT SWIVEL ASSEMBLY, T710BJ T069/B058 60HR 8C358 BRAND SCREW ASSEMBLY, TAPTITE P TYPE D5.
- 37 - REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE : S SAFETY Mark AL ALTERNATIVE PARTS *S *AL LOC NO . PART NO. DESCRIPTION/SPECIFICATON C A P A C I T O R s C 3 0 1 0 C Q 1 0 2 1 N 4 0 9 0.
*S *AL LOC NO . PART NO. DESCRIPTION/SPECIFICATON MODEL :T730BHKL DATE:2004.12.20 MODEL :T730BHKL DATE:2004.12.20 C 9 1 3 0 C E 4 7 6 C K 6 3 8 "47UF SHL,SD 50V M FM5 TP 5" C 9 1 4 0 C Z Z T F T 0 0 1 P ECQB1H153JM3 153J 50V TP5.
MODEL :T730BHKL DATE:2004.12.20 MODEL :T730BHKL DATE:2004.12.20 5.6BV 5MA PF Z D 4 0 6 0 D Z P T 5 6 0 0 9 A UZ-5.6BSB PCTRONIX TP52 DO34 500MW 5.6BV 5MA PF Z D 9 0 2 0 D Z P T 5 1 0 0 9 A UZ-5.
MODEL :T730BHKL DATE:2004.12.20 MODEL :T730BHKL DATE:2004.12.20 R 4 1 9 0 R N 4 7 0 2 F 4 0 9 47K 1/6W 1% TA52 R 4 2 0 0 R D 2 0 0 1 Q 6 0 9 2K 1/4W(3 5% TA52 R 4 2 1 0 R D 1 5 0 1 Q 6 0 9 1.
*S *AL LOC NO . PART NO. DESCRIPTION/SPECIFICATON MODEL :T730BHKL DATE:2004.12.20 MODEL :T730BHKL DATE:2004.12.20 10.0MM NI PLATED P 9 0 2 3 6 6 - 1 6 4 A YW396-03AV YEONHO 3P 3.96MM S/T R L 9 0 1 6 9 2 0 T B B 0 0 7 A JZC-42012-2HS HONGMEI 250VAC 5A 12V 2A NO VENTING S C 3 0 1 6 6 2 0 T B D 0 0 3 A PCS701E PARK ELEC.
- 42 - REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE : S SAFETY Mark AL ALTERNATIVE PARTS *S *AL LOC NO .
*S *AL LOC NO . PART NO. DESCRIPTION/SPECIFICATON MODEL :T730SHKL DATE:2004.12.20 MODEL :T730SHKL DATE:2004.12.20 C 9 1 0 0 C K Z T T A 0 0 2 A 220PF K 1KV R TP5.
MODEL :T730SHKL DATE:2004.12.20 MODEL :T730SHKL DATE:2004.12.20 C O I L s & C O R E s F B 3 0 2 6 2 1 0 T C E 0 0 3 L BAS3580T BO SUNG 3580MM AXIAL52MM F B 3 0 5 6 2 1 0 T C E 0 0 3 P BRS2550B BO .
MODEL :T730SHKL DATE:2004.12.20 MODEL :T730SHKL DATE:2004.12.20 R 4 2 4 0 R D 1 0 0 0 Q 6 0 9 100 1/4W(3 5% TA52 R 4 2 5 0 R D 1 0 0 0 Q 6 0 9 100 1/4W(3 5% TA52 R 4 2 6 0 R D 1 0 0 0 Q 6 0 9 100 1/4W.
*S *AL LOC NO . PART NO. DESCRIPTION/SPECIFICATON MODEL :T730SHKL DATE:2004.12.20 MODEL :T730SHKL DATE:2004.12.20 S C 9 0 1 6 6 2 0 T K B 0 0 2 B SA-4S HUA JIE AC UNIVERSAL 3PIN B L A C K S G 3 0 5 6 .
- 47 - - 48 - SCHEMATIC DIAGRAM NOTICE Since this is a basic schematic diagram. The value of components and some partial connection are sucject to be changed for improvement without notice.
- 50 - D R A O B T I U C R I C D E T N I R P ) e d i S t n e n o p m o C ( D R A O B N I A M . 3 ) e d i S r e d l o S ( D R A O B N I A M . 4 ) e d i S t n e n o p m o C ( D R A O B L O R T N O C .
Dec 2004 P/NO : 3828TSL109G Printed in China.
An important point after buying a device LG Electronics T730BH (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought LG Electronics T730BH yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data LG Electronics T730BH - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, LG Electronics T730BH you will learn all the available features of the product, as well as information on its operation. The information that you get LG Electronics T730BH will certainly help you make a decision on the purchase.
If you already are a holder of LG Electronics T730BH, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime LG Electronics T730BH.
However, one of the most important roles played by the user manual is to help in solving problems with LG Electronics T730BH. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device LG Electronics T730BH along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
