HP f1723 Service Manual
17-inch lcd monitor
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Also See for f1723:
- User manual (48 pages) ,
- Quick user manual (2 pages) ,
- Specifications (2 pages)
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Summary of Contents for HP f1723
- Page 1 Service Manual 17-inch LCD Monitor f1723/FP7317/L1702/ vf17/FP17...
- Page 2 This manual may not, in whole or in part, be copied, respective owners. photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp. f1723 / FP7317 / L1702 / vf17 / FP17 Service Manual.
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Page 3: Table Of Contents
/ FP7317 / L1702 / vf17 / FP17 1) Circuit Description Audio circuit ------------------------------------------------------------------------------------------------------------------- 3 1.1 Audio input ----------------------------------------------------------------------------------------------------------------- 3 1.2 Audio output --------------------------------------------------------------------------------------------------------------- 3 Power supply ------------------------------------------------------------------------------------------------------------------- 3 Video input circuit ------------------------------------------------------------------------------------------------------------- 3 Definition converter LSI peripheral circuit --------------------------------------------------------------------------------- 3... - Page 4 / FP7317 / L1702 / vf17 / FP17 2) Trouble Shooting No display of screen (Screen is black, color of LED is amber) -------------------------------------------------------- 13 Nothing displays on screen (Screen is black, color of LED is green) ------------------------------------------------ 14...
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Page 5: Audio Circuit
/ FP7317 / L1702 / vf17 / FP17 1) Circuit Description 1. Audio circuit (Circuit diagrams Main PWB 5/5) (Optional) Audio input The audio signal input received from the audio input terminal (P305) is applied to the amplifier I309 of 1 and 9 through the low-pass filter consisting of R361, R360, C370, C371, C361 and C363. -
Page 6: E 2 Prom
/ FP7317 / L1702 / vf17 / FP17 6. E PROM (Circuit diagram MAIN PWB 4/5) Data transfer between I307 (24LC16) and Scaller IC I304 is effected through the IIC bus SCL (pin 37) and SDA (pin 36) of I304. The data to be transferred to each device are stored in I307. - Page 7 / FP7317 / L1702 / vf17 / FP17 Table 1 Mode Resolution H-freq Band Width Polarity (KHz) (MHz) VGA 640 x 480 60Hz 31.47 25.175 VESA 640 X 480 72Hz 37.86 31.5 VESA 640 X 480 75Hz 37.5 31.5 VGA 720 x 400 70Hz 31.47...
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Page 8: User Control
/ FP7317 / L1702 / vf17 / FP17 Table 2 the number of the lines, Vsync distinction Indication resolution The number of the Distinction Vsync distinction lines 640 x 480 487 < LINE < 607 fV < 63 Hz 63 Hz <... -
Page 9: Control Of Identification Converter Lsi
/ FP7317 / L1702 / vf17 / FP17 Control of definition converter LSI 7.4.1 Functions Major function of I304 are as follows: (1) Expansion of the display screen. (2) Timing control for various signal types. (3) Power-supply sequence (LCD panel). -
Page 10: Power On Sequence
/ FP7317 / L1702 / vf17 / FP17 Power ON sequence When the POWER switch is pressed, the POWER signal is turned “L”. When this “L” potential is detected, the CPU begins to establish the respective power supplies according to the sequence shown below. -
Page 11: Power Off Sequence
/ FP7317 / L1702 / vf17 / FP17 Power OFF sequence When the POWER switch is pressed while the power supply is ON, the POWER signal is turned “L”. When this “L” potential is detected, the CPU begins to turn off the respective power supplies according to the sequence shown below. -
Page 12: List Of Cpu Assignments
/ FP7317 / L1702 / vf17 / FP17 7.8 List of GPIO Pin Assignments of the I304 Port Pin No. Signal Name Initial Setting Function Remark GPIO1 MUTE Audio Mute Enable GPIO21 KEY_POWER ON/OFF Monitor Power GPIO4 UART_DI UART interface data IN... -
Page 13: Power Board Operation Therory
/ FP7317 / L1702 / vf17 / FP17 8. Power Board Operation Therory 8.1 Line filter consists of C801, T801, C802, C803, C804, C837, C838. It eliminates high frequency interference to meet EMI’s requirement. 8.2 Rec & Filter Bridge diode D801 converts AC source into pulsed DC. This pulsed DC is smoothed and filtered by C805. R802 is an NTC ( negative thermal coefficient ) resistor, used to reduce inrush current to be within safe range. -
Page 14: Inverter Circuit
/ FP7317 / L1702 / vf17 / FP17 9. Inverter Circuit This unit operates on an output voltage of 15V from power source. Regulator: Q101 get a +5VDC for I101 power supply. UVP: Q106 turns off when the Vin is under 10V. Then pin 3 of I101 is pulled low and inverter off immediately. -
Page 15: No Display Of Screen (Screen Is Black, Color Of Led Is Amber)
/ FP7317 / L1702 / vf17 / FP17 2) Trouble Shooting 1. No display of screen (Screen is black, color of LED is amber) Does OSM display when you push MENU button. When a signal isn't being inputted, it is indicated with "VIDEO... -
Page 16: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)
/ FP7317 / L1702 / vf17 / FP17 2. Nothing displays on screen (Screen is black, color of LED is green) Is backlight lit? Refer "Checking the backlight unit" section Does computer output RGB video signals? 1) Change pattern of video signal output on the host. - Page 17 / FP7317 / L1702 / vf17 / FP17 Continue Check the 3.3 V power are supplied on I301, pin 4. Check if the voltage on I301 pin 1 that is high level DC at 5V. Failure point 1) Printed wire broke between P301 pin 7, 8 and and I301.
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Page 18: Checking The Back Light Unit
/ FP7317 / L1702 / vf17 / FP17 3. Checking the back light unit Is +22.5V supplied to inverter PWB? Failure point 1) Inverter cable disconnection. 2) Power board failure. Check the BKLT_EN signal of the rectangle input P301 pin 2 at TTL high level Is a "H"... -
Page 19: Abnormal Screen
/ FP7317 / L1702 / vf17 / FP17 4. Abnormal screen Check the R, G, B video signal from computer input on D-Sub R, G, B connector. Failure point 1) No R, G and B video signal output from host computer. Check computer 2) Video signal cable disconnection. -
Page 20: No Osm Display
/ FP7317 / L1702 / vf17 / FP17 5. No OSM display Check the input TTL level whether was changed when pressed function keys. Failure point 1) Printed wire broke between P308 pin 5 and I304 pin 29. 2) Printed wire broke between P308 pin 6 and I304 pin 32. -
Page 21: Abnormal Plug And Play Operation
/ FP7317 / L1702 / vf17 / FP17 6. Abnormal plug and play operation Confirm the output of serial data on I303 pin 6 synchronize SCLK at TTL level. Failure point I304 failure. Failure point 1) The host machine isn't communicating in DDC2 mode. -
Page 22: Checking The Interface Circuit Of Sync Signal
/ FP7317 / L1702 / vf17 / FP17 7. Checking the interface circuit of sync signal 7.1 Checking the control circuit of horizontal sync pulse Check the horizontal sync signal on I304 pin 101 TTL level. Failure point 1) Video cable may have failed. -
Page 23: Checking The Resolution Change Ic Movement
/ FP7317 / L1702 / vf17 / FP17 8. Checking the resolution change IC movement Is there +3.3V supply on I304 pin 124,136,132,128, 113, 108, 104, 106, 110, 115, 14, 30, 90, 143, 157. Proceed "Checking the DC/DC converter circuit" section. -
Page 24: Checking The Dc/Dc Converter Circuit
/ FP7317 / L1702 / vf17 / FP17 9. Checking the DC/DC converter circuit Check if the 5V is output from P301 pin 7, 8. Printed wire broke between P301 pin 7, 8 and I301 pin 1. Check the output of 3.3V line voltage from I301 pin 4. -
Page 25: Power Board
/ FP7317 / L1702 / vf17 / FP17 10. Power Board Check output voltage +22.5V, +12V is right or not. It is not power board problem. Check power switch is turn on or not. Turn switch on. Check power cord (P801), signal cable (P302), P802, P803, CN102, CN103 is connected right or not. -
Page 26: Recommended Parts List
/ FP7317 / L1702 / vf17 / FP17 1. Recommended Parts List Note: 1. The components identified by “ “ mark are critical for X-ray safety. Replace these with only the same parts specified. The components identified by “ * “ mark are critical parts. - Page 27 LITE-ON TECHNOLOGY CORP. 5 F, No. 16, Sec. 4, Nanking E. Road, Taipei, Taiwan Tel: 886-2-25706999 Fax: 886-2-25706888 URL:// www.liteontc.com.tw Printed in Taiwan...