Samsung Q844 Service Manual

COLOR MONITORSERVICE MANUALWebsite:http://biz.LGservice.comE-mail:http://www.LGEservice.com/techsup.htmlCAUTIONBEFORE SERVICING THE UNIT, READ THE SA

BLOCK DIAGRAM- 10 - SIGNALINPUT

DESCRIPTION OF BLOCK DIAGRAM- 11 -1. Line Filter & Associated Circuit.This is used for suppressing noise of power input lineflowing into the moni

- 12 -12. High Voltage Output & FBT (Flyback Transformer).The high voltage output circuit is used for generatingpulse wave to the primary coil of

ADJUSTMENT- 13 -GENERAL INFORMATIONAll adjustment are thoroughly checked and correctedwhen the monitor leaves the factory, but sometimesseveral adjust

- 14 -11) Display color 15,0 Full White(70x70mm) at mode 4.12) DRIVE ADJ command.13)Set B-DRIVE to 94(5E(h)) at DRIVE of thealignment program.14) Adju

- 15 -TROUBLESHOOTING GUIDE1. NO POWERNO POWER(POWER INDICATOR OFF)TROUBLE INBRIDGE DIODE(D901)TROUBLE IN FUSE (F901)TROUBLE IN IC901CHECKFUSE OK?(F90

- 16 -2. NO CHARACTERCHECK IC302 PIN 5, 6, 7 ?CHECK IC302 PIN 19, 20, 21PIN 10 (5V) ?CHECK IC303 PIN 1, 3, 5PIN10 (12V), PIN 6 (80V) ?TROUBLE INP301,

- 17 -3. NO RASTERNO VIDEO(POWER INDICATOR GREEN or AMBER)CHECK POWER INDICATORGREEN or AMBER ?CHECKSCREEN CONTROLKNOB OF FBTCHECKVOLTAGE AT D924/D926

- 18 -4. NO VERTICAL DEFLECTIONNO V-DEFLECTION(ONE HORIZONTAL LINE)CHECKIC601 Pin 3(15V) ?CHECK IC601 PIN 7 (47V)?TROUBLE IN T901 15V LINETROUBLE INT7

- 19 -5. TROUBLE IN DPMCHECK IC401 (MICOM)PIN 40, 41 (H/V INPUT)SIGNAL?CHECK IC401 PIN 9, 8WAVEFORM?CHECK IC401 PIN 6(5V, HIGH)?CHECK IC401 PIN 17, 18

1. PICTURE TUBESize : 19 inch (Flat Slot Mask)DefIection Angle : 90°Neck Diameter : 29.1 mmStrip Pitch : 0.24 mmDiagonal Size : 457.5 mm View Size

- 20 -6. NO DEGAUSSINGCHECK IC401 PIN 6(5V)?CHECK Q920 COLLECTOR VOLTAGE(0.5V)?CHECK P901?CHECK RL901?TROUBLE IN IC401 (MICOM) TROUBLE IND925TROUBLE I

- 21 -EXPLODED VIEW981314147BA1011151511712abbcd34162566-1bdcabbbcd

- 22 -EXPLODED VIEW PARTS LISTPart No.3091TKC095A6318L19008A3809TKC045D3809TKC045A3043TKK101A339-002J4951TKS041H6140TC2017A6871TST378A6174T13010K6200T

- 23 -DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIONC301 0CK1020K515 1000PF 50V K B TRC303 0CK3320K515 3300P 50V K B

DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIONC833 181-482D 184J 18.0*15.0*8.5*7.5 250VC834 0CN1040K949 0.1M 50V Z F TA52C83

DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIOND902 0DRGF00109A GUF10M GULF TP DO41 1000V 1AD903 0DR100009CA RGP10G TP GULF S

DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIONQ802 0TR471009AA KSD471AC-Y TP SAMSUNG TO92Q803 0TR564009AB KSB564AC-YTA TP S

DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIONR705 0RB0150K609 0.15 OHM 2 W 5% TA52R706 0RD1003Q609 100K 1/4W(3 5% TA52R707

DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIONR921 0RD0332Q609 33 1/4W(3 5% TA52R922 0RD5601Q609 5.60K 1/4W(3 5% TA52R923 0R

DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATIONR813 0RH1004D622 1.0M 1/10W 5 D.R/TPR814 0RH1004D622 1.0M 1/10W 5 D.R/TPR817

SAFETY PRECAUTIONS- 3 -SAFETY-RELATED COMPONENT WARNING!There are special components used in this color monitorwhich are important for safety. These p

PIN CONFIGURATION- 30 -M24C08 Serial I2C BUS EEPROMSYMBOLE0-E2SDASCLWCVccVssDESCRIPTIONChip Enable InputSerial Data Address Input/OutputSeria

- 31 -AMPLIFIER AFLYBACKGENERATORGUARDCIRCUITINPUT STAGEfrom e.g TDA485Xor SAA4856INPINNIPROTECTIONAMPLIFIER B496812357OUTAGUARO output/power save mo

- 32 -TDA4841PS PHLIPS 32P1234567891011121314151632313029282726252423222120191817FOCUSHSMODHPLL2HCAPHREFHBUFHPLL1SGNDVCAPVREFVAGCVSMODASCORSD

- 33 -- 34 -SCHEMATIC DIAGRAMNOTICESince this is a basic schematic diagram.The value of components and some partial connection are sucject to be chang

- 35 -- 36 -PRINTED CIRCUIT BOARD3. MAIN BOARD (Component Side)1. CONTROL BOARD (Component Side)4. MAIN BOARD (Solder Side)2. CONTROL BOARD (Solder Si

Apr. 2003P/NO : 3828TSL087D Printed in Korea

TIMING CHART- 4 -VIDEOSYNCDAEFBCkHz µs µs µs µs µs µsHzmsmsmsmsmsmsMODE 1 –43.26923.11217.7785.3341.5561.5562.222–85.00811.76311.0930.6700.0230.0690.5

OPERATING INSTRUCTIONS- 5 -REAR VIEW FRONT VIEW Front Control PanelSee Front Control PanelPower ButtonUSB portD-Sub Signal ConnectorAC Power Socket1.

Universal Serial Bus- 6 -USB connection (Option)(1) Connect the upstream port of the monitor to the downstream port of the USBcompliant PC or another

CONTROL LOCATIONS- 7 -VR901: B Adjustment (190V Line)+VR801: High Voltage Adjustment (27kV)

WIRING DIAGRAM- 8 -P301P302P303Signal CableAC SocketFBTP801S+S-P901P910P702P453P451P902P401P201P250P402P502

DISASSEMBLY- 9 -1. TILT/SWIVEL & BACK COVER REMOVAL1) Set the monitor face downward.2) Carefully remove the Tilt/Swivel by pulling it upward.3) Re