lcd panel edid eeprom error pricelist

Frequently Asked Questions About LED LCD 2 in 1 EDID Notebook LCD Screen Code Chip Data Read Cable For RT809F RT809H CH341A TL866CS and TL866A Programmer Motherboards in INDIA

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I"m faced with an interesting issue! One of our client Dell laptop does not show POST/Dell splash screen when powered on. Eventually, after a minute or two, the Windows login screen appears. I"ve replaced the LCD panel, updated BIOS, drained power, reseated everything possible, and even re-imaged the HD. Dell diagnostics gives me this error: LCD EDID - Unable to access EDI EEPROM, even after replacing the LCD panel. I"m beginning to suspect that the motherboard is the culprit here. Anyone seen this type of issue before?Just out of curiosity, what does Dell Support have to say about that error?

I"m faced with an interesting issue! One of our client Dell laptop does not show POST/Dell splash screen when powered on. Eventually, after a minute or two, the Windows login screen appears. I"ve replaced the LCD panel, updated BIOS, drained power, reseated everything possible, and even re-imaged the HD. Dell diagnostics gives me this error: LCD EDID - Unable to access EDI EEPROM, even after replacing the LCD panel. I"m beginning to suspect that the motherboard is the culprit here. Anyone seen this type of issue before?Just out of curiosity, what does Dell Support have to say about that error?

SOLVED! I replaced the LVDS cable, and I am now able to see the Dell splash screen and also access BIOS and PXE boot. Diagnostics no longer reports an error. It"s a beautiful day - birds are chirping, flowers are blooming, people are happy. Thank you all for the support!!!

G2420HD is defined 24’W LCD Monitor supports WXGA (1920x1080) resolution with DPMS (Display Power Management System) and Senseye function. There are three different input types, D-sub, DVI and HDMI, of models. G2420HD adopts AUO panel, M240HW01 V2.

The features summary is shown as below, *All panel spec. in service manual definition depends on the variance of panel source. *All spec. of monitor need to warm up at least 1hr. * To test the “Contrast Ratio” and “Luminance” functions, the color status must be “User preset” mode. 1. “Contrast Ratio”: Set “brightness” at 100, and “contrast” at 50. 2. “Luminance”: Set “brightness” at 100, and “contrast” at 100.

Feature items Specifications Remark Panel supplier & module name AUO M240HW01 V2 TN, Normally white Screen diagonal 24W” 609.7mm Display Format 531.36(H) x 298.89(V) Panel Display information Pixel Pitch 0.276 mm x 0.276 mm per one triad R/L:85/85 degrees (typ) Viewing Angle (@ Contrast Ratio >= 10) and U/D: 80/80 degrees (typ) With 15-pin D-sub Analog interface with Scaling supported Yes connector DVI interface with Scaling supported Yes HDMI interface with Scaling supported Yes Max resolution mode supported 1920 (H) x 1080(V)@60Hz Number of Display Colors supported 16.7 Millions RGB 6-bit + FRC Test Condition: Set Contrast at 50, Brightness Contrast Ratio 1000:1 (typ.),600:1(min) at 100, Color at User preset Test Condition: Set 300 cd/m2 (typ.),240 cd/m2 contrast at 100, brightness Luminance (min) at 100 , color at User preset. AC power input Yes 90-264 Volts, 47-63 Hz. DC power input (with AC power adapter) No Off mode<1W DPMS supported(G2420HD) Yes Sleep Mode <1W LED indicator for power status showed Yes Green/Amber/None OSD for control & information supported Yes Multi-language supported for OSD Yes 17 languages. Buttons control supported Yes Flywheel control supported No Scaling function supported Yes

-5- Auto adjustment function supported Yes “I-Key” function DDC function supported (EDID ver. 1.3) Yes DDC2B DDC-CI support version 1.1 or later Yes DDC-CI Audio speakers supported No Audio Jack (input connector) supported No Earphone Jack (input connector) supported Yes For HDMI Audio only Microphone function supported No Mechanical Tilt base design Yes From -5 to +23 degree VESA wall mounting design Yes Mechanical Rotate design No Mechanical Lift base design No Kensington compatible lock design Yes

3.1.2.1 Power supplyItem Condition Spec OK N.A Remark Universal input fullInput Voltage range 90~264VAC /47~63Hz  rangeInput Current range 90 ~ 264VAC < 2.0 Arms Power Consumption Normal “On” operation <49 W  LED: Green DPMS “Off” state <1W LED: OffDPMS(G2420HD)  DPMS “Sleep” state <1W LED: Amber 110 VAC < 30 A (peak)Inrush Current  Cold-start 220 VAC < 60A (peak)Earth Leakage Current 264 VAC/50Hz < 3.5 mA  1. 1500VAC, 1 sec Without damage (on-line test)Hi-Pot 2. Ground test: 30A,  < 0.1 ohm (in-lab test) 1secPower Line Transient IEC1000-4-4 1KV  Common: 2KV, IEC1000-4-5 (Surge)  Differential: 1KV Depends on panelCCFL operation range 90 ~ 264VAC 3~8mA  source Depends on panelCCFL Frequency 90 ~ 264VAC 40KHz ~ 80KHz  source Color: BlackPower cord Length: 1500 +/- 50  mm

3.1.2.5 Plug & Play DDC2B DDC-CI SupportItem Condition Spec OK N.A RemarkDDC channel type DDC2B  Refer to BenQ LSEDID Version 1.3  EDID definition. Refer to BenQDDC-CI Version 1.1 or Later  DDCCI requirement definition.

3.1.4.1 The Physical definition & Technology summary of LCD panelItem Condition Spec OK N.A RemarkLCD Panel Supplier AUO Panel type of Supplier M240HW01 V2 Display area Unit=mm 531.36(H) x 298.89(V) Physical Size Unit=mm 556(H) x323.2(V) x 16.65(D) Weight Unit=gram 2860(typ.) Technology TN type Pixel pitch Unit=mm 0.276(H) x 0.276(W) (Typ.)  Per one triadPixel arrangement R/G/B vertical stripe Display mode Normally White Support color 16.7Millions colors  6 bit + HiFRC

3.1.4.2 Optical characteristics of LCD panelItem Unit Conditions Min. Typ. Max. Remark [degree] Horizontal 75 85 - [degree] (Right) 75 85 - CR = 10 (Left)Viewing Angle [degree] Vertical (Up) 70 80 - [degree] CR = 10 70 80 - (Down)Contrast ratio Normal Direction 600 1000 [msec] Rising Time - 3.4 7.4Response Time [msec] Falling Time - 1.6 2.6 [msec] Rising + Falling - 5 10 Gray to Gray - 2 - Red x 0.619 0.649 0.679 Red y 0.308 0.338 0.368Color / Chromaticity Green x 0.259 0.289 0.319Coordinates (CIE) Green y 0.579 0.609 0.639 Blue x 0.116 0.146 0.176 - 14 - Blue y 0.04 0.07 0.10 Color Coordinates (CIE) White x 0.283 0.313 0.343 White White y 0.299 0.329 0.359 [%] 9 points Luminance Uniformity 75 80 measurement White Luminance @ CCFL [cd/m2] 240 300 - 6.0mA (center) Crosstalk (in 75Hz) [%] 1.5 * The test methods for the above items definition, please refer to the relative panel specification.

- 18 -3.2. Customer Acceptance 3.2.1. SCOPE This document establishes the general workmanship standards and functional Acceptance criteria for LCD color monitor model G2420HD Produced by BenQ Corporation.

3.2.2. PURPOSE The purpose of this publication is to define a procedure for inspection of the LCD monitor by means of a customer acceptance test, the method of evaluation of defects and rules for specifying acceptance levels.

3.2.3. APPLICATION The "Customer Acceptance Criteria" is applicable to the inspection of the LCD monitor, completely packed and ready for dispatch to customers. Unless otherwise specified, the customer acceptance inspection should be conducted at manufacturer"s site.

- 21 - No Description Class3.4 Poor print of logo or name plate Major3.5 Label on product Wrong or missing Major3.6 Scratched or dirty but legible spec. label Minor3.7 GAP between LCD and front bezel is over 2.0 mm Major3.8 Dot/area discolor over 1mm dia. in front or over 2mm dia. in other areas Major3.9 Cabinet warped, sagged or bulging ＞0.5% of surface length Major3.10 Cabinet warped, sagged or bulging noticeable but ＜0.5% of surface length Minor3.11 Sharp stud or edge, which can cause damage not safe Major3.12 Finishing of piece parts will not arrived in good condition at the customer Major3.13 Cabinet step ( between housing and bezel ) ＞1.0mm , < 1.5mm Minor3.14 Cabinet step ( between housing and bezel ) ＞1.5mm Major3.15 Wiring or fixing cord comes out of cabinet or jammed Major3.16 Auxiliary material used during production not removed Major3.17 Cabinet parts come loose during normal handling, not safe Critical3.18 Cabinet parts come loose during normal handling, but safe Major3.19 Tilt/swivel too flexible/not working Major3.20 Tilt/swivel stiff Minor3.21 Dirty front bezel and housing can’t remove Major3.22 Dirty front bezel and housing removable easily Minor3.20 Sticker or loose user control switch which will not function correctly Major3.21 Missing knob or switch, not safe Critical3.23 Missing knob or switch, but safe Major3.24 Poor functional user controls in mechanical Major3.25 Unreadable printing of user controls label Major3.26 Rubber foot missing Major3.27 LED wrong material or missing Major3.28 LED sagged >1.0mm or bulging>0.5mm Minor3.29 Wrong S/N between spec. label and monitor display Major 4 AC power and signal cable4.1 AC power or connector not correct or damaged, not safe Critical4.2 AC power or connector not correct or damaged, but safe Major4.3 Signal cable contact pin dirty Minor4.4 Signal cable plug dirty or surface damaged, but safe Minor4.5 Cable crack Major4.6 Cable scratch ( wire not exposed ), or dirty Major4.7 AC-DC adapter no function Minor4.8 Signal cable contact pin dirty Major 5 Interior of the product5.1 Use Non-QVL ( Qualify vendor list )component Major5.2 Wrong parts, broken component, but safe Major5.3 Foreign material Conductive (Has potential to short circuit) Major Non-conductive (Moveable) Minor5.4 Missing hardware, component or screw, stripped screw Major5.5 Loose hardware/screw or insufficient torque Major5.6 Poor wire routing, which is no concerned on EMI Minor5.7 Cold soldering/loose connections (Electrical) Major5.8 Wires and mechanical structure do not meet UL/CSA or TUV Critical5.9 Wrong parts, broken component, not safe Critical5.10 Component burn Critical - 22 -3.2.13. OPERATIONAL INSPECTION CRITERIA

3.2.14. PANEL INSPECTION CRITERIA Inspection Item Specification Line defect Can’t be seen Bright Dot <=2 dots Green bright <=2 dots dots Dark dots <=4 dots Total dots defect <=5 dots Continuous Two continuous bright dots(vertical ,horizontal, oblique):<=1 Defect pair Exclude continuous green-green bright dots Three or more continuous bright dots (vertical, horizontal ,oblique):Not allowed Two continuous dark dots(vertical ,horizontal, oblique):<=2 pairs Three or more continuous dark dots(vertical, horizontal, oblique):Not allowed Distance between 2B dots:>=15mm Distance between 2Ddots:>=15mm Distance between B and D dot :>=10mm

E. Writing EDID file: 1. Setup a PC with DDC card. 2. Connect PC to monitor with a D-sub(DVI) signal cable. 3. Please refer to the C212 for the correct EDID file. 4. Runs the writing program to write the EDID file into EEPROM . 5. Read EEPROM data and confirm it to match with the C212 document definition.

PC Host will send 0x7C IIC slave address and then following 4 bytes command Byte Byte I2C Send Command Byte1 2 3 Byte4 OK N.A. Remark cksu Write Contrast to MCU RAM CA 55 Data m  cksu Write Brightness to MCU RAM CA 56 Data m  cksu Write data to MCU RAM Write Red Gain to MCU RAM CA 57 Data m  and update the related cksu register to refresh the Write Green Gain to MCU RAM CA 58 Data m  screen immediately. cksu Don’t store data to Write Blue Gain to MCU RAM CA 59 Data m  EEPROM. cksu Read Contrast from MCU RAM C3 55 XX m  cksu Read Brightness from MCU RAM C3 56 XX m  Read Red Gain from MCU RAM by cksu color index C3 57 XX m  Read Green Gain from MCU RAM by cksu color index C3 58 XX m  Base on current color Read Blue Gain from MCU RAM by cksu index to read back the color index C3 59 XX m  right gain value. Write C1 (Bluish) R-Gain Data to cksu EEPROM AA 3C Data m  Write C1 (Bluish) G-Gain Data to cksu EEPROM AA 3D Data m  Write C1 (Bluish) B-Gain Data to cksu EEPROM AA 3E Data m  Write C2 (sRGB) R-Gain Data to cksu EEPROM AA 4C Data m  Write C2 (sRGB) G-Gain Data to cksu EEPROM AA 4D Data m  Write C2 (sRGB) B-Gain Data to cksu EEPROM AA 4E Data m  Write C3 (Reddish) R-Gain Data to cksu EEPROM AA 5C Data m  Write C3 (Reddish) G-Gain Data to cksu EEPROM AA 5D Data m  Write C3 (Reddish) B-Gain Data to cksu EEPROM AA 5E Data m  cksu Write User R-Gain Data to EEPROM AA 6C Data m  cksu Write User G-Gain Data to EEPROM AA 6D Data m  cksu Write User B-Gain Data to EEPROM AA 6E Data m 

- 33 - cksuWrite Cx R-Gain Data to EEPROM AA 7C Data m  cksuWrite Cx G-Gain Data to EEPROM AA 7D Data m  Reserved for some cksu model have extra colorWrite Cx B-Gain Data to EEPROM AA 7E Data m  temperature cksuWrite Contrast to EEPROM AA 92 Data m  cksuWrite Brightness to EEPROM AA 93 Data m  1=C1/9300/Bluish, 2=C2/6500/sRGB/, cksu 3=C3/5800/Reddish,Write C/T index to EEPROM AA 94 1~4 m  4=User, 5=Cx cksuWrite OSD-Hpos to EEPROM AA 95 Data m  cksuWrite OSD-Vpos to EEPROM AA 96 Data m 

1=English, 3=French, 0=Deutsch, 4=Italian, 2=Spanish, 5=JAPAN, 6=繁中, 7=簡中 8=Hungarian, 9=Serbian, 0A=Russian, 0B=Dutch, 0C=Polish, 0D=Czech, 0E=Swedish, cksu 0F=Portugese,Write Language to EEPROM AA 97 0~17 m  10=Romanian cksuWrite EEPROM OSD Timer AA 98 Data m  cksuWrite EEPROM Volume AA 99 Data m  cksu For model with GammaWrite EEPROM Gamma index AA 9A Data m  curve selection function cksuWrite OSD Transparency to EEPROM AA 9E Data m  cksuWrite OSD Rotation to EEPROM AA 9F Data m Read C1 (Bluish) R-Gain data from cksuEEPROM A3 3C XX m Read C1 (Bluish) G-Gain data from cksuEEPROM A3 3D XX m Read C1 (Bluish) B-Gain data from cksuEEPROM A3 3E XX m Read C2 (sRGB) R-Gain data from cksuEEPROM A3 4C XX m Read C2 (sRGB) G-Gain data from cksuEEPROM A3 4D XX m  - 34 -Read C2 (sRGB) B-Gain data from cksuEEPROM A3 4E XX m Read C3 (Reddish) R-Gain data from cksuEEPROM A3 5C XX m Read C3 (Reddish) G-Gain data from cksuEEPROM A3 5D XX m Read C3 (Reddish) B-Gain data from cksuEEPROM A3 5E XX m  cksuRead User R-Gain data from EEPROM A3 6C XX m  cksuRead User G-Gain data from EEPROM A3 6D XX m  cksuRead User B-Gain data from EEPROM A3 6E XX m  cksuRead Cx R-Gain data from EEPROM A3 7C XX m  cksuRead Cx G-Gain data from EEPROM A3 7D XX m  Reserved for some cksu model have extra colorRead Cx B-Gain data from EEPROM A3 7E XX m  temperature cksuRead Contrast from EEPROM A3 92 XX m  cksuRead Brightness from EEPROM A3 93 XX m  1=C1/9300/Bluish, 2=C2/6500/sRGB/, cksu 3=C3/5800/Reddish,Read C/T index from EEPROM A3 94 XX m  4=User, 5=Cx cksuRead OSD-Hpos EEPROM A3 95 XX m  cksuRead OSD-Vpos from EEPROM A3 96 XX m  1=English, 3=French, 0=Deutsch, 4=Italian, 2=Spanish, 5=JAPAN, 6=繁中, 7=簡中 8=Hungarian, 9=Serbian, 0A=Russian, 0B=Dutch, 0C=Polish, 0D=Czech, 0E=Swedish, cksu 0F=Portugese,Read Language from EEPROM A3 97 XX m  10=Romanian cksuRead OSD Timer from EEPROM A3 98 XX m  cksuRead Volume from EEPROM A3 99 XX m  cksu For model with GammaRead Gamma index from EEPROM A3 9A XX m  curve selection functionRead OSD Transparency from cksuEEPROM A3 9E XX m 

- 35 - cksuRead OSD Rotation from EEPROM A3 9F XX m Change Color Temp. to cksuC1/9300K/Bluish CC 01 XX m Change Color Temp. to cksuC2/6500K/sRGB CC 02 XX m Change Color Temp. to cksuC3/5800K/Reddish CC 03 XX m  Change C/T immediately. cksu And store C/T index toChange Color Temp. to User CC 04 XX m  EEPROM. cksuChange Color Temp. to Cx CC 05 XX m  Reserved cksuChange Input Source to D-Sub CD 01 XX m  cksuChange Input Source to DVI CD 02 XX m  cksuOn burn in mode CE 01 XX m  Store data to EEPROM cksu XX* = Non “1” valueOff burn in mode CE XX* XX m  Store data to EEPROM cksuMonitor is forced power saving CF 01 XX m  cksuMonitor wake up from power saving CF XX* XX m  XX* = Non “1” value cksuChange Sense-Eye mode to Standard C0 00 XX m  cksuChange Sense-Eye mode to Movie1 C0 01 XX m  cksu Change Sense-EyeChange Sense-Eye mode to Movie2 C0 02 XX m  mode immediately. And cksu store the index toChange Sense-Eye mode to Photo C0 03 XX m  EEPROM. cksuSet luminance sensor mode to Off C1 00 XX m  cksuSet luminance sensor mode to Bright C1 01 XX m Set luminance sensor mode to cksu Change luminanceModerate C1 02 XX m  sensor mode cksu immediately. And storeSet luminance sensor mode to Dim C1 03 XX m  the index to EEPROM. cksuIncrease ADC R-Offset2 AC 23 Data m  cksuIncrease ADC G-Offset2 AC 24 Data m  cksuIncrease ADC B-Offset2 AC 25 Data m  cksuIncrease ADC R-Gain AC 33 Data m  cksuIncrease ADC G-Gain AC 34 Data m 

- 36 - cksuIncrease ADC B-Gain AC 35 Data m  cksuDecrease ADC R-Offset2 AD 23 Data m  cksuDecrease ADC G-Offset2 AD 24 Data m  cksuDecrease ADC B-Offset2 AD 25 Data m  cksuDecrease ADC R-Gain AD 33 Data m  cksuDecrease ADC G-Gain AD 34 Data m  cksuDecrease ADC B-Gain AD 35 Data m  cksuRead ADC R-Offset2 AE 23 XX m  cksuRead ADC G-Offset2 AE 24 XX m  cksuRead ADC B-Offset2 AE 25 XX m  cksuRead ADC R-Gain AE 33 XX m  cksuRead ADC G-Gain AE 34 XX m  cksuRead ADC B-Gain AE 35 XX m  cksuUser mode to factory mode 1A 5A XX m  cksuAuto Color (Offset1, Offset2, Gain) 1B 5A XX m  cksu For specified “IndustryCopy EDID Serial number to EEPROM 1C 5A XX m  Customer” model. cksuFactory mode to User mode 1E 5A XX m  cksuClear user mode and factory recall 1F 5A XX m  Store data to EEPROMWrite EDID data to MCU DDC RAM 55 NA NA NA  For MTV312 MCU typeCopy DDC RAM data to EEPROM BB NA NA NA  For MTV312 MCU typeDrive WP pin to low to enable write DDCIC 55 NA NA NA  For stand alone DDC ICDrive WP pin to high to disenable writefunction BB NA NA NA  For stand alone DDC IC For input signal withSwitch DDC bus to DVI-A DDC IC 44 NA NA NA  multi-input source For input signal withSwitch DDC bus to DVI-D DDC IC 33 NA NA NA  multi-input source cksuChange Senseye Mode C0 0~3 XX m 

EEPROM Bank R/W (For Debug using only, not for Production Line Write EEPROM directly) Addr cksuRead EEPROM Bank 0 B0 ess XX m  Addr cksuRead EEPROM Bank 1 B1 ess XX m  Addr cksuRead EEPROM Bank 2 B2 ess XX m  (For 24C08 type) Addr cksuRead EEPROM Bank 3 B3 ess XX m  (For 24C08 type) Addr cksuWrite EEPROM Bank 0 B8 ess Data m  Addr cksuWrite EEPROM Bank 1 B9 ess Data m  Addr cksuWrite EEPROM Bank 2 BA ess Data m  (For 24C08 type) Addr cksuWrite EEPROM Bank 3 BB ess Data m  (For 24C08 type)

When PC Host sends 0x7D command to MCU, MCU must return as following (2 bytes)Return Code R-Byte1 R-Byte2Checksum error code FC AANormal return code the above Byte3 (/data) FCIf normal return code is exact FCh FC CF

ite picture Operation Tool Notesm Put panel on the1 cushion carefully,

9 Use location location tool: tool ,location the bkt on G24101 panel10 Stick tapes follow standard: One tape stick on angel side ,one on right side ,one on ground side . Stick acetic tapes on left

14 Put c/b in the button, and put button in bezel. Tear the tapes on the back of c/b wire , insert c/b connector in I/F ,stick c/b on panel .

The G2420HD is a 24” (1920x1080) Model, LCD type is TN+ Film and Normally White,16.7M colors(R, G, B 6-bit data+ FRC data) TFT LCD monitor. There are D-SUB, DVI andHDMI interface LCD monitor. It’s compliant with VESA specification to offer a smart powermanagement and power saving function. It also offers OSD menu for users to control theadjustable items and get some information about this monitor. The best function is to offerusers an easy method to do DDC/CI Enable and Auto Adjustment items well done just bypressing hot key, we called it “DDC/CI” and “Auto” which can manual controlled items. G2420HD also offer DDC2/CI function to meet VESA standard.

The G2420HD consists of a LCD module with 4 lamps, a power board including an inverter,a control board, a Interface board. The block diagram is shown as below.Monitor internal structure

- 58 - (b) Circuit operation theory A basic operation theory for this interface board is to convert analog signals of Red, Green and Blue to digital signals of Red, Green and Blue. The scaling IC has internal A/D converter, internal OSD, built in RSDS transmitter and auto-detect input timing functions. A/D converter is convert analog signal to digital data. OSD is offering adjustable functions to end-user. Detect timing is for detect change mode. RSDS transmitter is used to compress the digital RGB data, the Hsync, Vsync and pixel clock generated by Scaling then output to LCD module. Flash-rom stores source code and MCU (embedded in Scalar) offers H/W DDC2Bi function & controls system processing. EEPROM is stored DDC data, OSD common data and user mode data.

(c) IC introduction: 1.) DDC (Display Data Channel) function: We use DDC IC to support DDC2Bi function. DDC data is store in 24C02 (EEPROM). Those data related to LCD monitor specification. PC can read them by “SDA” and “SCL” serial communication for I²C communication for DDC2Bi. 2.) Scalar IC: There are A/D, TMDS receiver, Scaling, OSD and LVDS transmitter functions built-in the RTD2482D IC. Scaling IC is revolutionary scaling and color engine, capable of expanding any source resolution to a highly uniform and sharp image or down scaling from 1920x1080, combined with the critically proven integrated 8 bit triple-ADC and patented Rapid-lock digital clock recovery system. It also support detect mode and DPMS control. 3.) MCU embedded in Scalar: Control unit, it controls all the functions of this interface board, just like the OSD display setting, the adjustable items, adjusted data storage, the external IIC communication, support DDC2Bi. . 4.) EEPROM: We use 24C16 to store all the adjustable data, user settings and uses two 24C02 to store D-SUB, DVI and HDMI data. 5.) Flash-rom stores source code.

A-2.) Control board introduction There are 6 keys for user"s control which includes “Power”, “Menu”, “Right/Plus”, “Left/Minus”, “Auto”, and “Enter”. The following descriptions are the introduction of these keys. (1) Power key: to turn/off power of monitor (2) “Menu” key: to enter sub-menus or select items. (3) “Right/Plus key: to select previous and to increase adjustment and Brightness /Contrast Popup submenu hotkey (4) “Left/Minus” key: to select next and to decrease adjustment and Senseye Mode Popup submenu hotkey - 59 - (5) “Auto” key: to perform auto adjustment (6) LED: It indicates the DPMS status of this LCD monitor; blue light means DPMS on (Normal operating condition). Amber light means DPMS off (Power Saving).

Q852 IC851 2SJ598 L852 C852 TL1451ACN Q855-C PANEL_5V C859 S D 0.1U K 1U K 1DTC

- 64 -IC851(TL1451) is a 2-way PWM control IC. C851/R851 determine the frequency of PWM. Pin 1IN+/1IN- and 2IN+/2IN- are the inputs of the error amplifiers. 1IN+/2IN+ are used as the feedback pins for DC-DC circuit. 1DTC/2DTC are used for determining the threshold states of dead time control. C854, C855, C857, C858, R855 and R873 are used for gain/phase compensation. P11

S D PANEL_+5V IC851 L852 TL1451ACN 47U

LCDM Inverter Controller --- OZ9933 OZ9933 is a high performance, cost-effective CCFL controller designed for driving large-size LCD applications requiring 2 to 6 CCFLs. The controller converts unregulated DC voltages into a nearly sinusoidal lamp voltage and current waveforms. The OZ9933 supports full-bridge power conversion topologies while maintaining high- efficiency operation, current and voltage regulation, over-voltage and over-current protection, high drive capability. The control logic provides s regulated ignition voltage and appropriate protection features for over-voltage or over-current conditions.Pin Assignment of OZ9933

I also tried holding the "D" key and powering up. The LCD flashed a series of solid color screens (Red, Green, Blue, White, Black). I assume that this means that the backlight is good. Does it also mean that the cable is good?

Not sure what else to check. I am guessing that it is eiter the LCD screen (controller board) itself or the cable. Any advice? I am comfortable replacing parts.