786PF Service Manual PROVIEW ELECTRONICS CO.,LTD 6F,No.
TABLE OF CONTENTS SERVICE WARNING·····································1 A. I M P O R T A N T S A F E T Y I N S T R U C T I O N · · · · · · · · · · · · · · · · · · · · · 1 B. S P E C I F I C A T I O N S · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 C. T I M I N G C H A R T · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 5 D. C O N T R O L L O C A T I O N · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 6 E.
To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified monitor engineer. Contact the local dealer or the nearest MAG branch office if you need help. A. IMPORTANT SAFETY INSTRUCTION Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in the user's manual for this product. 1.
See service manual for proper replacement.Maximum 2nd anode voltage must not exceed 30KV at any operating conditions. To measure 2nd voltage use high impedance meter connect (-) chassis, use a high voltage lead from (+) to 2nd anode. VR501,VR601 has been sealed against improper replacement or defeating the control. Instructions for proper replacement of such sealed controls should also be provided in the service information. B.
17“ 0.25mm dot pitch,Pure Flat Square Tube,90°deflection, Anti-glare,Anti-static,Anti-reflection. 16.0 inch 310mm (H) × 230mm (V) 1. Screen 2. Visible Image Area 3. Active Display Area 4. Synchronization Range Horizontal 30 – 86 KHz Vertical 50 – 160 Hz 100 – 240 Vac , 60/50 Hz 5. Power Source 120W (max.) 6. Power Consumption 7. Input Signal Video Analog R.G.B. , 0.7Vp-p / 75 Ohm Sync. TTL level,positive or negative polarity 15 Pin D Type 8. Connection Type 1600 × 1200 pixels 9.
D B D : Back Porch E : Front porch E Sync. C A Preset Modes Dot Rate (MHz) F.H (KHz) A- Period (uS) B- Active (uS) C- Sync (uS) D-Back Porch (uS) E-Front Porch (uS) F.V (Hz) A- Period (Ms) B- Active (mS) C- Sync (mS) D-Back Porch (mS) E-Front Porch (mS) H/V SYNC Interlaced VGA 640 × 480 VGA 720 × 400 VESA 800 × 600 VESA 640 × 480 XGA 1024 × 768 SIEMENS VESA 800 × 600 VESA 1024 × 768 SIEMENS 640 × 480 800 × 600 VESA 1024 × 768 VESA 1280 × 1024 25.175 28.322 40.000 36.000 65.000 40.
a. Power Switch b. Power Indicator c.Encoder d. Enhance Key E.
IC601 VR501 Q504 VR601 IC901 L705 T501 C504 Q703 FBT F501 F. ADJUSTMENT PROCEDURE ITEM Program Menu.
B+ Adjust A ﹟Digital Voltmeter ﹡D510 Negative ﹫Crosshatch Pattern (31.5KHz,640x480) 1. Make the adjustment to the value shown at right by turning the VR501 on the main PCB. High Voltage ﹟Digital Voltmeter 1. Turn the power switch of the monitor OFF. Adjust 2. Connect high voltage probe to Anode Cap and ﹟High Voltage GND. Probe 3. Turn the power switch of the monitor ON. ﹡Anode Cap-GND B (15 minutes) ﹫Crosshatch Pattern 4. Make the adjustment to the value shown at right (31.
Background ﹟Color Analyzer White ﹫R.G.B off Balance (68KHz,1024x768) D Adjust White Balance Adjust E F ﹟Color Analyzer ﹟Oscilloscope ﹡Cathode G ﹫3” block (68KHz,1024x768) 1. Set the contrast to MAX.,Brightness to Y=0.7 set color is 9300°K using the OSD. 2. Set the OSD to COLOR of sub menu and press knob. 3. Make the adjustment R.G.B BIAS low light to the value shown at right by using encorder. 1. Move the OSD to the R.G.B. DRIVE. 2.
﹫Magenta color Static Convergence (31.5KHz,640x480) Adjust J 1. Open the two pawels of the 4 pole magnets to allow the red and blue vertical lines to unite. 2. Open and rotate the two pawels at a contrast angle so that the red and blue horizontal lines can unite. 3. If the vertical lines deviates,open the two powals at the deviation position and make a monitor adjustment by changing its angle. 4. Display white crosshatch pattern. 5.
G.
H. TROUBLE SHOOTING HINTS BRIGHT HOR. LINE APPEAR ON THE SCREEN NO POWER T501(7) VOLTAGE No T501 (7) No 160 V ? AC120V IN AC220V IN AC230V IN CHECK F501,D514 , D515,D516, D517 Yes IC501 (7) No > 14 V ? CHECK IC501,R539, D505,ZD551 Yes No IC501(6) CHECK 14Vp-p ? IC501,Q504 Yes No D510 (-) CHECK 15.
NO RASTER No IC301 CRT G1 (2) -20V~ Yes -80V ? 12 V ? Q710 (E) CHECK 15V LINE -0.6V ? IC901(4) -1.5V~-1.8V No IC301 (4) Yes CHECK -12V -12 V ? LINE No IC301 (1) CHECK Yes 0.
DEFLECTIVE HOR. CKT No No Yes No Yes No Yes HEATER VOLT 6.3 V ? No No Yes CHECK CHECK B+ VOLT 7.2 V ? No CHECK Q711(B) < 0.7 V ? IC901(24) > 2.
OFF MODE Yes FAILURE No IC901(40) Q703 o (C) 1.0 (41)~ 1.2 H/V KSIGNAL VP-P? ? Yes CHECK No Yes NO RASTER PC No Yes Q703 (B) DRIVE PULSE No No Q703 T701 (3) FAILURE B+ ? Yes No CHECK FBT Yes No Yes Q702 (G) REPLACE CHECK CHECK DRIVE PULSE Q703 B+ 51V B+ 51V No Yes No No CHECK IC601 CHECK Q719,(G) CHECK DRIVE PULSE? Yes B+ = 15V? 986N:T701(3) Voltage for each mode Fh T701(3) B+ 31.
Yes NO ROTATION No P903 No OK ? Yes No IC901(20) CHECK PS 0 0V? Yes IC901 No Q505 (C) CHECK Q505 7.
NO CHARACTERS Yes MISSING ONE COLOR No CRT KG Yes 80V0-P? CHECK NO RASTER Rotation Coil No IC203 Q902 (c) (3) Yes P-P? ? 3915VV CHECK No R979Yes 15V IC203 LINE CHECK 7V? No 7V LINE Q902 (B) Yes Q903 (B) 1.5~13V ? CHECK Q902 Q903 Q904 (B) CHECK 0~2.
OSD DOES NOT WORK No Yes IC201 (19) OSD G 5V0-P? No IC201(24) CHECK 7V ? IC201 Yes IC202 (3) No 5 V0-P ? CHECK M703 BLK ? Yes IC203 (8) 12 V ? No CHECK 12V Yes IC201 (10) 5V ? No CHECK IC201 Yes IC201 (7) CHECK I/P SIGNAL 0.7VP-P ? IC201 (19) CHECK IC901 (32) : Missing Green 0.
No Yes No IC202(6) CHECK 4.2VP-P ? 80V ? CHECK D203 I. REPLACEMENT PARTS LIST 786PF Spare Parts List Location.
R205,235,265,281,284,285,516,664 R711A,918A,942,943,952,953,982 R984,985 R703 210-101-0856 100Ω 1/8W 17 210-101-0856 100Ω 1/8W 1 R736 210-102-0256 1KΩ 1/2W 1 R525,740,754,7A8 210-102-0456 1KΩ 1/4W 4 R210,240,270,533,546,626,755,793 R974,993 210-102-0856 1KΩ 1/8W 10 R991 210-102-0856 1KΩ 1/8W 1 R529,536,610,983 210-103-0456 10KΩ 1/4W 4 R288,291,510,590, 606,615, 630, 651 R730,931,947 210-103-0856 10KΩ 1/8W 11 R710 210-203-0856 20KΩ 1/8W 1 R724 210-103-0856 10KΩ
R706,708 210-222-0856 2.2KΩ 1/8W 2 R535,654,728 210-223-0856 22KΩ 1/8W 3 R667 210-223-0856 22KΩ 1/8W 1 R723 210-223-0856 22KΩ 1/8W 1 R717 210-223-0856 22KΩ 1/8W 1 R794A 210-245-0856 2.4MΩ 1/8W 1 R308 210-471-0256 470Ω 1/2W 1 R521,713 210-271-0456 270Ω 1/4W 2 R670,7A1 210-302-0856 3.0KΩ 1/8W 2 R514 210-303-0456 30KΩ 1/4W 1 R979 210-330-0456 33Ω 1/4W 1 R7A6 210-331-0856 330Ω 1/8W 1 R601,665 210-332-0856 3.3KΩ 1/8W 2 R604 210-332-0856 3.
R619,669 210-473-0456 47KΩ 1/4W 2 R290,507,522,622,932,940,941, 210-473-0856 47KΩ 1/8W 7 R501 210-474-0256 470K 1/2W 1 R206,236,266,2A2 210-510-0256 51Ω 1/2W 4 R739,760 210-512-0856 5.1KΩ 1/8W 2 R2A6 210-513-0856 51KΩ 1/8W 1 R905 210-561-0456 560Ω 1/4W 1 R920 210-561-0856 560Ω 1/8W 1 R334 210-562-0456 5.6KΩ 1/4W 1 R290.292.294.295 210-562-0856 5.6KΩ 1/8W 4 R604 210-562-0856 5.6KΩ 1/8W 1 R668 210-563-0456 56KΩ 1/4W 1 R292 210-622-0856 6.
R513 220-2R7-3059 2.7Ω R-MNF 3W 1 R714 220-R47-3059 0.47Ω R-MNF 3W 1 R623 220-4R7-2059 4.7Ω R-MNF 2W 1 R528 220-561-1059 560Ω R-MNF 1W 1 R503 220-753-3059 75KΩ R-MNF 3W 1 R705 220-8R2-2059 8.2Ω 2W 1 R609 221-081-1152 11.5KΩ 1% 1/8W 1 R749 221-081-2400 240Ω 1% 1/8W 1 R747 221-081-2702 27KΩ 1% 1/8W 1 R752 221-081-3003 300KΩ 1% 1/8W 1 R751 221-081-3003 300KΩ 1% 1/8W 1 R302 221-081-3572 35.7KΩ 1% 1/8W 1 R753 221-081-3242 32.
C521 300-331-0123 330u 100V E.C 105C 1 C510,612,613,715,774, 901 300-4R7-5020 4.7u 50V E.C 6 C773 300-4R7-5020 4.7u 50V E.C 1 C772 300-4R7-5020 4.7u 50V E.C 1 C272,2A4,607,615 300-470-1620 47u 16V E.C 4 C745 300-470-1620 47u 16V E.C 1 C744 300-470-0120 47u 100V E.C 1 C501,519,305 300-471-2520 470u 25V E.C 3 C701 300-6R8-5020 6.8u 50V E.C 1 R545 300-680-3520 68u 35V E.C 1 C609 305-103-0550 0.
C712 309-432-1552 4300p 1.5KV PHM 1 C620,790 310-104-0252 0.1u 250V MEM 2 C710 310-823-0252 0.082u 250V MPP 1 C716 310-225-0252-H 2.2u 250V MPP 1 C717 310-224-0452 0.22u 400V MPP 1 C709 310-274-0252 0.27u 250V MPP 1 C731 310-824-0452 0.82u 250V MPP 1 C508,524 315-224-2572 0.22u 250V X-CAP 2 C502,503,555 317-222-4072 2200p 400V Y-CAP 3 C619 318-102-0550 1000p 50V. MEM 1 C611 318-103-0550 0.01u 50V. MEM 1 C310,608,721 318-104-0550 0.
SG281 430-301-0001 300V 1 IC902 501-000-2408 AT24C08 1 IC901 503-100-62P2-P CPU 1 IC201 504-550-1237 LM1237 1 IC202 504-000-2480 LM2480 1 IC203 504-000-2469 TDA2469 1 IC203 Heat Sink 123-003-P6SE-E IC203 H.S 1 IC301 504-900-8172 TDA8172 1 IC301 Heat Sink 120-002-P6SE-B IC301,H.
D201,231,261,202,232,262,203,233 D263,503,507,518,532,601,602,603 D604,606,610,611,711A,713,714,716 D720,725,752,753, 901,902,904 D605 520-001-4148 1N4148 31 520-001-4148 1N4148 1 D703,704 520-001-4148 1N4148 2 D505,712,715,708 520-010-4936 1N4936 4 D707 520-010-4936 1N4936 1 D711 520-010-4937 1N4937 1 ZD702 521-005-03R6 HZ4A2 (3.6V) 1 ZD281,701,901,902,903,904.
POWER CORD 600-151-2804D 150mm 1 SIGNAL CABLE 610-171-15801 Signal Cable 1 Rear Support Bracket 121-001-P6SE-B 1 Rear Bracket 121-002-P6SE-A 1 CRT Cover 123-004-P6SE 1 CRT DY Cover T703 123-002-768I-A 700-119-246P 700-117-25PF-2 700-117-26SS 700-117-2806 700-115-2823 730-400-770VC For TCO 986NS 787NS 786NS 772NS 562NS Focus choke 1 T501 730-102-P6SE-A Power Converter 1 T702 730-200-770VC H-Driver 1 T701 730-302-P6SE FBT 1 Degaussing Coil 735-017-X771-C L200.
MAIN BOARD (Soild Side) 37
K.
MEMO 42