Samsung PN19LT/LO Service Manual Download Page 31

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5 Troubleshooting

5-14

PN19LT/LO/JT/JO

5-2-3 Missing Color

Proper Video levels are

on CN101 (D-Sub) Pin 1, 3 and 5?

Proper Video signal is on all

cathodes?

Refer to 5-1-16 No Video.

Yes

Check signal generator.

Proper DC voltage is

on all cathodes?

Check IC101 Pin 18, 21 and 24.

Check QR01, QR02, QG01, QG02,

QB01, and QB02.

Yes

G2 voltage is right?

Check D502, D518, Q501, D520,

D521, and CN501.

Heater voltage is right?

Check D608, Q604 and T601.

Yes

Check D504, Q502 and T501.

Yes

G1 voltage is right?

Replace CRT.

Done

WAVEFORMS

10.0 V (R,G,B, Video)

CH1 P-P = 10.0V

CH1 RMS = 17.02V

Summary of Contents for PN19LT/LO

Page 1: ...OR MONITOR CONTENTS 1 Precautions 2 Product Specifications 3 Disassembly Reassembly 4 Alignment Adjustments 5 Troubleshooting 6 Exploded View Parts List 7 Electrical Parts List 8 Block Diagram 9 Wirin...

Page 2: ...l protective devices such as nonmetallic control knobs insulating materials cabinet backs adjustment and compartment covers or shields isolation resistor capacitor networks mechanical insulators etc 3...

Page 3: ...ance between each blade of the AC plug and accessible conductive parts see above should be greater than 1 megohm 7 Never defeat any of the B voltage interlocks Do not apply AC power to the unit or any...

Page 4: ...c TTL level positive negative Maximum Pixel Clock rate 135 MHz Active Display Horizontal 352mm 3 mm Vertical 264 mm 3 mm Input Voltage AC 90 264 Volts 60 Hz 50 Hz 3 Hz Power Consumption 120 Watt max D...

Page 5: ...ure 2 2 Male Type Sync Type Pin No Macintosh Separate 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Red Green Blue N C GND DDC GND R GND G GND B N C GND Sync Self raster N C DDC Data H Sync V Sync DDC Clock GND...

Page 6: ...14 268 0 064 1 080 12 711 0 413 28 322 Negative Positive Separate 31 469 31 778 3 813 1 907 25 422 0 636 59 940 16 683 0 064 1 048 15 253 0 318 25 175 Negative Negative Separate 43 269 23 111 1 556 2...

Page 7: ...2 Product Specifications 2 4 PN19LT LO JT JO Memo...

Page 8: ...makes a ttak sound 2 grooves Left and Right Make sure each snap is disengaged 5 Pull the Rear Cover up off the monitor 6 Remove the Back Shield TCO95 PN19LT LO JT JO 3 1 3 Disassembly and Reassembly T...

Page 9: ...release the snaps 2 connecting the Front Cover and the PCB then lift up the Bottom to separate the two Shield 6 Disconnect the Tilt connector at the CN304 connector on the Main PCB 7 Disconnect the Su...

Page 10: ...fied adjust at the 1024 x 768 mode 68 kHz 85 Hz signal 4 1 2 Required Equipment The following equipment may be necessary for adjustment procedures 4 1 2 a DISPLAY CONTROL ADJUSTMENT 1 Non metallic scr...

Page 11: ...the signal timing available on that computer system To make corrections to all factory timings requires the use of an additional signal generator 4 Alignment and Adjustments 4 2 PN19LT LO JT JO MONIT...

Page 12: ...hat the back raster comes to the center when you apply each basic mode 4 2 4 Centering Centering means to position the center point of the display in the middle of the display area Horizontal size and...

Page 13: ...rity 2x x100 Vertical Linearity 2x x100 Table 4 2 Preset Mode 68KHz 85Hz Pre load Mode Refer to Timing Chart 4 2 5 a HORIZONTAL LINEARITY ADJUSTMENT CONDITIONS Scanning frequency 68 kHz 85 Hz Display...

Page 14: ...n Adjustment CONDITIONS Scanning frequency 68 kHz 85 Hz Display image Crosshatch pattern Use control bar after selecting PINCUSHION in left menu to straighten the sides of the image area 4 2 10 Tilt A...

Page 15: ...ting GREEN CUTOFF in the menu 3 Use control bar after selecting BLUE CUTOFF in left menu to set the y coordinate to 0 298 0 02 4 Use control bar after selecting RED CUTOFF in left menu to 0 283 0 02 I...

Page 16: ...68 Display image H character pattern Brightness Cut off point Contrast Maximum PROCEDURE 1 Adjust the Focus VR on the FBT to display the sharpest image possible 2 Use Locktite to seal the Focus VR in...

Page 17: ...Memo 4 Alignment and Adjustments 4 8 PN19LT LO JT JO...

Page 18: ...cuits High voltage does not develop Horizontal output circuits 5 1 1 No Power Supply Check and replace IC601 IC701 Q702 and Q703 Check and replace FH1 D601 D701 and Q701 Done Yes Repeating start Check...

Page 19: ...e H V sync video level LED blinks Check IC201 Pin 40 Yes No 12 V line off Check IC201 Pin 5 Yes No IC602 Pin 4 voltage exists Check IC201 Pin 6 Check and replace IC602 No Yes IC601 Pin 1 output voltag...

Page 20: ...CH1 RMS 5 868V 4 1 00V IC401 8 CH1 P P 1 00V CH1 RMS 1 298V 5 20 0 V Q403 Drain CH1 P P 20 0 V CH1 RMS 46 80V Does PWM output signal appear at Pin 6 H_out of IC401 Check IC401 Check 12 V line Yes No D...

Page 21: ...C401 Pin 6 voltage varies with different B_Out DAC values Q402 Gate output duty varies with different B_Out DAC values Check some parts around Q402 and IC401 Pin 3 6 Yes No Check and replace IC401 No...

Page 22: ...ferent DAC values No Check Some parts around IC401 Q405 Q407 and Q408 No WAVEFORMS 7 7 1 00 V IC401 11 CH1 P P 1 00V CH1 RMS 3 008 V 5 1 10 Tilt Failure IC201 Pin 20 output duty varies with different...

Page 23: ...ply No IC301 Pin 6 output exists Check and replace some parts around IC301 Yes No Check DY connector connection WAVEFORMS 8 9 8 500 V IC401 12 CH1 P P 500 V CH1 RMS 1 425 V 9 10 0 V IC301 6 CH1 P P 10...

Page 24: ...10 3 10 2 00 V Q402 Gate CH1 P P 2 00 V CH1 RMS 7 692V 3 2 00 V IC401 6 CH1 P P 2 00 V CH1 RMS 5 868 V 11 50 0 V Q402 Drain CH1 P P 50 0 V CH1 RMS 73 7V IC101 Pin 8 input exists and varies with diffe...

Page 25: ...ght Some parts around Q802 Q803 Q804 Q805 Q806 and Q807 are right Replace failed part Yes Yes No Replace the IC401 No UZ801 Voltage is 6 2V Check and replace UZ801 Yes No Check the connection between...

Page 26: ...Check and replace IC103 Yes No Cathode DC levels are right Check 70 V line Check and replace QR01 QR02 QG01 QG02 QB01 and QB02 Check and replace IC101 Pin 25 26 27 Yes No G2 voltage is right Check G2...

Page 27: ...voltage is 5V IC201 Pin 13 and 14 inputs are right Check C202 C203 and X201 Yes Yes No Check IC604 No IC201 Pin 18 input is right Check IC605 and 5V Yes No All in output values are right Replace IC20...

Page 28: ...Yes No Check and replace Q102 Check CN102 Pin 14 No IC101 Pin 29 and 30 inputs are right Check IC201 Pin 41 and 42 Yes No IC101 Pin 18 21 and 24 outputs are right Check and replace IC101 Check and re...

Page 29: ...sh the button S W Yes Check the button SW201 SW204 No Check IC201 CN2 and CN206 RL601 operation is right Q601 base input is right Check 13V Line Check and replace Q601 No No Yes Check D coil and TH601...

Page 30: ...Check G2 voltage high voltage and R G B cathode voltage No No Yes Refer to 5 2 2 Shut down Yes 5 2 2 Shut Down Blinking LED s Scan failure Check horizontal vertical deflection system and check power s...

Page 31: ...al generator No Proper DC voltage is on all cathodes Check IC101 Pin 18 21 and 24 Check QR01 QR02 QG01 QG02 QB01 and QB02 Yes Yes No G2 voltage is right Check D502 D518 Q501 D520 D521 and CN501 No Hea...

Page 32: ...FLB pulse is on Collector of Q303 Check Blank pulse is on Pin 17 of IC401 and Q303 Done Yes No Does approve the Vertical pulse on the CRT Socket G1 Check CN102 and CN201 Yes No Check white balance adj...

Page 33: ...t Signals at Pin 28 and 29 of IC201 are right Check IC201 Yes Yes No Check Video Cable No Signals at Pin 14 and 15 of IC401 are right Check IC401 Check circuits on Main board Yes Done No Check input s...

Page 34: ...LT LO JT JO 5 17 The convergence is now within spec Readjust convergence No Done Yes The convergence is now within spec Done Change CRT and readjust convergence No Done Yes Try readjusting convergence...

Page 35: ...check for focus change Yes Dynamic focus circuit is right Refer to 5 1 15 Dynamic Focus Failure Replace the CRT and verify focus Yes No Adjust focus VR of FBT 5 2 7 Poor Focus 5 2 8 Purity Failure Pu...

Page 36: ...PN19LT LO JT JO 6 1 6 Exploded View and Parts List 6 1 PN19LT...

Page 37: ...6 2 PN19LO 6 Exploded View Parts List 6 2 PN19LT LO JT JO...

Page 38: ...6 Exploded View Parts List PN19LT LO JT JO 6 3 6 3 PN19JT...

Page 39: ...6 Exploded View Parts List 6 4 PN19LT LO JT JO 6 4 PN19JO...

Page 40: ...6 Exploded View and Parts List 6 1 1 Front Cover CRT Ass y PN19LT PN19LT LO JT JO 6 5...

Page 41: ...6 1 2 Chassis Stand Ass y PN19LT 6 Exploded View Parts List 6 6 PN19LT LO JT JO...

Page 42: ...6 1 3 Rear Ass y PN19LT 6 Exploded View Parts List PN19LT LO JT JO 6 7...

Page 43: ...6 2 1 Front Cover CRT Ass y PN19LO 6 Exploded View Parts List 6 8 PN19LT LO JT JO...

Page 44: ...6 2 2 Chassis Stand Ass y PN19LO 6 Exploded View Parts List PN19LT LO JT JO 6 9...

Page 45: ...6 2 3 Rear Ass y PN19LO 6 Exploded View Parts List 6 10 PN19LT LO JT JO...

Page 46: ...6 3 1 Front Cover CRT Ass y PN19JT 6 Exploded View Parts List PN19LT LO JT JO 6 11...

Page 47: ...6 3 2 Chassis Stand Ass y PN19JT 6 Exploded View Parts List 6 12 PN19LT LO JT JO...

Page 48: ...6 2 3 Rear Ass y PN19JT 6 Exploded View Parts List PN19LT LO JT JO 6 13...

Page 49: ...6 4 1 Front Cover CRT Ass y PN19JO 6 Exploded View Parts List 6 14 PN19LT LO JT JO...

Page 50: ...6 4 2 Chassis Stand Ass y PN19JO 6 Exploded View Parts List PN19LT LO JT JO 6 15...

Page 51: ...6 4 3 Rear Ass y PN19JO 6 Exploded View Parts List 6 16 PN19LT LO JT JO...

Page 52: ...D15 L35 NTR NYLON66 SNA HS410 6502 000001 CABLE CLAMP DAWH 5NB D15 L35 NTR NYLON66 SNA IC201 0903 001194 IC MICROCONTROLLER 3P863 8Bit SDIP 42P 600MIL 12MHz ST CMOS PLASTIC 5V 40to 85C 1040BYTE 48KBYT...

Page 53: ...D AA 45ohm 35x0 6x57mm 50m A SN 20 ui 2000 SNA C201 2401 000025 C AL 100uF 20 16V GP TP 6 3x11 5 C202 2201 000389 C CERAMIC DISC 0 022nF 5 50V NP0 TP 5x3 5 C203 2201 000389 C CERAMIC DISC 0 022nF 5 50...

Page 54: ...x3 5mm 5 C447 2201 000476 C CERAMIC DISC 0 033nF 10 500V SL TP 5 5x3 5 C448 2305 000428 C FILM MPEF 47nF 5 250V TP 11x9x4 5 5mm C450 2305 000237 C FILM MPEF 1uF 5 63V TP 7 5x15 5mm 5mm C501 2301 00001...

Page 55: ...1 0402 000274 DIODE RECTIFIER UF4004 400V 1A DO 41 TP D402 0402 000006 DIODE RECTIFIER 1N4007GP 1000V 1A DO 41 TP D403 0402 000006 DIODE RECTIFIER 1N4007GP 1000V 1A DO 41 TP D404 0402 000006 DIODE REC...

Page 56: ...EYELET ID2 2 OD2 7 L3 1 SN BSS3 E EH SNA EY407 6042 000001 EYELET ID2 2 OD2 7 L3 1 SN BSS3 E EH SNA EY408 6042 000001 EYELET ID2 2 OD2 7 L3 1 SN BSS3 E EH SNA EY409 6042 000001 EYELET ID2 2 OD2 7 L3 1...

Page 57: ...BF HARNESS 52MM AWG22 0 6PI AWG22 0 SNA JP136 BH39 40305U CBF HARNESS 52MM AWG22 0 6PI AWG22 0 SNA JP17 BH39 40305U CBF HARNESS 52MM AWG22 0 6PI AWG22 0 SNA JP179 BH39 40305U CBF HARNESS 52MM AWG22 0...

Page 58: ...0 SNA JP58 BH39 40305U CBF HARNESS 52MM AWG22 0 6PI AWG22 0 SNA JP59 BH39 40305U CBF HARNESS 52MM AWG22 0 6PI AWG22 0 SNA JP62 BH39 40305U CBF HARNESS 52MM AWG22 0 6PI AWG22 0 SNA JP63 BH39 40305U CB...

Page 59: ...OHM 5 1 8W AA TP 1 8X3 2MM R202 2001 000290 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM R203 2001 000008 R CARBON 15KOHM 5 1 8W AA TP 1 8X3 2MM R204 2001 000008 R CARBON 15KOHM 5 1 8W AA TP 1 8X3 2MM R205...

Page 60: ...1 8W AA TP 1 8X3 2MM R413 2005 001018 R WIRE WOUND NON 0 56ohm 5 1W AA TP 4x12mm R414 2005 001018 R WIRE WOUND NON 0 56ohm 5 1W AA TP 4x12mm R416 2001 000107 R CARBON S 150KOHM 5 1 2W AA TP 2 4X6 4MM...

Page 61: ...W AA TP 1 8X3 2MM R522 2001 000812 R CARBON 5 6KOHM 5 1 8W AA TP 1 8X3 2MM R524 2001 000539 R CARBON 24KOHM 5 1 8W AA TP 1 8X3 2MM R525 2001 000273 R CARBON 100KOHM 5 1 8W AA TP 1 8X3 2MM R526 2001 00...

Page 62: ...810 2003 000804 R METAL OXIDE S 82Kohm 5 3W AA TP 6x16mm R811 2003 000804 R METAL OXIDE S 82Kohm 5 3W AA TP 6x16mm R812 2003 000804 R METAL OXIDE S 82Kohm 5 3W AA TP 6x16mm R813 2001 001093 R CARBON S...

Page 63: ...WER 2SC5552 NPN 65W TO 3PF ST 6 12 CIS BH61 70003A SPRING CVT4857 STS304 W1 2H T0 5 W3 8 SNA CIS BH62 00032A HEAT SINK HOR PHOENIX A1050S T1 0 SNA HS603 BH99 10019K ASSY HEAT SINK H S 31DF4 SOLDER SNA...

Page 64: ...0 6x57mm 50m A SN 20 ui 2000 SNA BD109 3301 001450 CORE FERRITE BEAD AA 45ohm 35x0 6x57mm 50m A SN 20 ui 2000 SNA C101 2202 002009 C CERAMIC MLC AXIAL 100nF 80 20 50V Y5V TP 2 3X3 C102 2401 000603 C A...

Page 65: ...DR05 0401 000005 DIODE SWITCHING 1N4148 100V 200mA DO 35 TP EY1 6042 000002 EYELET ID1 5 OD2 L3 1 SN BSS3 E EH SNA EY2 6042 000001 EYELET ID2 2 OD2 7 L3 1 SN BSS3 E EH SNA EY3 6042 000001 EYELET ID2...

Page 66: ...8W AA TP 1 8X3 2MM R117 2001 000734 R CARBON 4 7KOHM 5 1 8W AA TP 1 8X3 2MM R118 2001 000857 R CARBON 560OHM 5 1 8W AA TP 1 8X3 2MM R119 2001 000857 R CARBON 560OHM 5 1 8W AA TP 1 8X3 2MM R120 2002 0...

Page 67: ...TP 1 8X3 2MM SK101 1405 001064 SURGE ABSORBER 400V 20 AXIAL SK102 4715 001055 SURGE ABSORBER 1kV 50 10 RADIAL SKB01 4715 000102 SURGE ABSORBER 200V 20 1000A RADIAL SNA SKG01 4715 000102 SURGE ABSORBE...

Page 68: ...00099A COIL DEGAUSSING ASS Y 355 285 1250mm PN19L PN19LO 11 0mH 10 100Ts 9 0 19 90 265VAC 13 0 35 MAGNET 3302 000006 MAGNET RUBBER AF 14G 1620 1980G 0 58 0 9MGOe SNA 7 Electrical Parts List PN19LT LO...

Page 69: ...ONE 20 JP106 BH39 40305U CBFHARNESS 52MM NONE 21 JP204 BH39 40305U CBFHARNESS 52MM NONE 22 JP206 NONE BH39 40305U CBFHARNESS 52MM 23 JP207 NONE BH39 40305U CBFHARNESS 52MM 24 JP209 NONE BH39 40305U CB...

Page 70: ...8 Block Diagrams PN19LT LO JT JO 8 1...

Page 71: ...Memo 8 Block Diagrams 8 2 PN19LT LO JT JO...

Page 72: ...1 2 3 4 5 6 7 8 H H V V H H V V YELLOW BROWN RED BLUE YELLOW BROWN RED BLUE FOCUS1 WHT FOCUS2 RED CN304 1 2 1 2 GND KEY GND KEY WHITE WHITE BLUE BLUE CN206 CN501 CN201 GND HS IN DDC CLK DDC 5V S RASTE...

Page 73: ...Memo 9 Wiring Diagrams 9 2 PN19LT LO JT JO...

Page 74: ...PN19LT LO JT JO 10 1 T601 C620 1 2 10 Schematic Diagrams 10 1 SMPS Part Schematic Diagram 1 100 V IC601 1 CH1 P P 100 V CH1 RMS 350 2 V 2 100V IC601 1 CH1 P P 100V CH1 RMS 325 8 V...

Page 75: ...10 Schematic Diagrams 10 2 PN19LT LO JT JO R235 R211 18 10 2 Micom Part Schematic Diagram 18 1 00 V IC201 13 14 CH1 P P 1 00 V CH1 RMS 2 108V...

Page 76: ...Part Schematic Diagram 3 2 00 V IC401 6 CH1 P P 2 00V CH1 RMS 5 868V 4 1 00V IC401 8 CH1 P P 1 00V CH1 RMS 1 298V 7 1 00 V IC401 11 CH1 P P 1 00V CH1 RMS 3 008 V 8 500 V IC401 12 CH1 P P 500 V CH1 RMS...

Page 77: ...D430 R457 Q421 C442 C436 C419 R450 Q414 R451 R419 C431 R417 R420 D402 C423 R435 C420 D406 R434 Q410 Q409 R428 T401 C425 R443 Q404 6 5 10 4 Horizontal Part Schematic Diagram 5 20 0 V Q403 Drain CH1 P P...

Page 78: ...R527 R526 Q402 R516 T501 C407 23 13 10 11 10 5 High Voltage Part Schematic Diagram 10 2 00 V Q402 Gate CH1 P P 2 00 V CH1 RMS 7 692V 11 50 0 V Q402 Drain CH1 P P 50 0 V CH1 RMS 73 7V 13 100 V Q805 Col...

Page 79: ...15 1 00 V IC101 12 14 16 CH1 P P 1 00V CH1 RMS 2 452V 16 1 00 V IC101 18 21 24 CH1 P P 1 00V CH1 RMS 2 792V 17 20 0 V IC103 1 3 5 CH1 P P 20 0V CH1 RMS 40 52V 19 1 00 V IC101 32 CH1 P P 1 00V CH1 RMS...

Page 80: ...City Kyungki Do Korea Tel 82 31 200 7920 Fax 82 31 200 7802 Printed in Korea P N BH68 00393F 00 http www samsungmonitor com SyncMaster Worldwide http www samsung monitor com SyncMaster USA http www sa...

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