HP Pavilion F1723 User manual

ServiceManual
17-inch LCD Monitor
f1723/FP7317/L1702/vf17/FP17

Service Manual Versions and Revision
Copyright
Copyright 2003LiteOn Technology Corp.
All Rights Reserved
This manualmay not, inwholeorin part,becopied,
photocopied, reproduced, translated,orconvertedto any
electronicormachinereadable form without prior written
permissionof LiteOnTechnologyCorp.
f1723/ FP7317 / L1702 / vf17 / FP17 ServiceManual.
Trademarks
LiteOn is a registered trademarkof LiteOn
TechnologyCorp.
All other trademarks are the property of their
respective owners.
No.VersionReleaseDateRevision
1.1.0Feb.20,2003Originalrelease
2.2.0April 8,2003 Update

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f1723/FP7317/L1702 /vf17/FP17
1)CircuitDescription
1.Audio circuit-------------------------------------------------------------------------------------------------------------------3
1.1 Audio input-----------------------------------------------------------------------------------------------------------------3
1.2 Audio output---------------------------------------------------------------------------------------------------------------3
2.Power supply-------------------------------------------------------------------------------------------------------------------3
3.Video inputcircuit-------------------------------------------------------------------------------------------------------------3
4.Definition converter LSIperipheral circuit---------------------------------------------------------------------------------3
5.Systemreset,LED control circuit--------------------------------------------------------------------------------------------3
6.E
2
PROM-------------------------------------------------------------------------------------------------------------------------4
7.Controllercircuit---------------------------------------------------------------------------------------------------------------4
7.1 Dection ofPOWER switch status---------------------------------------------------------------------------------------4
7.2 Display mode identification----------------------------------------------------------------------------------------------4
7.3 User control----------------------------------------------------------------------------------------------------------------6
7.4 Controlof identificationconverterLSI---------------------------------------------------------------------------------7
7.5 I2C bus control-------------------------------------------------------------------------------------------------------------7
7.6 Power ONsequence------------------------------------------------------------------------------------------------------8
7.7 Power OFF sequence-----------------------------------------------------------------------------------------------------9
7.8 List of CPU assignments-----------------------------------------------------------------------------------------------10
8Power Board Operation Therory----------------------------------------------------------------------------------------------11
9Inverter Circuit-------------------------------------------------------------------------------------------------------------------12

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f1723/FP7317/L1702 /vf17/FP17
2)Trouble Shooting
1.Nodisplay of screen(Screenisblack,color of LED isamber)--------------------------------------------------------13
2.Nothing displayson screen(Screen is black, color ofLED is green)------------------------------------------------14
3.Checking the back lightunit-----------------------------------------------------------------------------------------------16
4.Abnormalscreen-------------------------------------------------------------------------------------------------------------17
5.No OSM display-------------------------------------------------------------------------------------------------------------18
6.Abnormal plug and playoperation---------------------------------------------------------------------------------------19
7.Checking the interface circuit ofsync signal----------------------------------------------------------------------------20
7.1 Checkingthe control circuit ofhorizontal sync pulse-------------------------------------------------------------20
7.2 Checking the control circuitof vertical sync pulse----------------------------------------------------------------20
8.Checking the resolution change IC movement--------------------------------------------------------------------------21
9.Checking theDC/DC converter circuit-----------------------------------------------------------------------------------22
10.Power board------------------------------------------------------------------------------------------------------------------23
3)RecommendedParts List
Recommended PartsList---------------------------------------------------------------------------------------------------24

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f1723/FP7317/L1702 /vf17/FP17
1)CircuitDescription
1.Audio circuit (Circuit diagrams Main PWB5/5) (Optional)
1.1Audioinput
The audio signal input received from the audio input terminal (P305) is applied tothe amplifier I309 of 1 and 9
through the low-pass filterconsisting ofR361, R360, C370, C371, C361 andC363.
Inthisaudio circuit, controlsof Volume,and muteareconducted. Theaudio signalcontrolledbya VR determines
the attenuation of output of the amplifiers.
1.2Audio output
Theaudio signal is outputfromthe jackoutput terminal (P306) to the internal speaker system.
2. Interfaceboard and panelpowersupply(CircuitdaigramsMAIN PWB 2/5)
2.1P301 connector
A5V powersupply for LCDmodule, CPU,and logicis generated from theP301 connector.
2.2I301-pin 1:4-terminal regulator
A 3.3Vpowersupply for Scaler IC I304, is generatedfrom the5V source.
2.3I301-pin 1:5-terminalregulator
A 2.5V power supply for ScalerICI304 isgeneratedfromthe5V source.
Q302,Q303ON/OFFcontrol forLCD Module
ON/OFF control is performed for power ON/OFFand also for thepower saving sequence.
3.Video inputcircuit(Circuit diagramMAINPWB3/5)
Theanalog video signal inputentered from P302, theAC-coupled video signal is used to clamp the black levelat
0V).
4.DefinitionconverterLSIperipheral circuit (CircuitdiagramMAINPWB 4/5)
I304 gm2121 is thedefinitionconverter LSI.
The analog R, G,Bsignal input enteredfromthe video input circuitis convertedinto the digital dataof video
signal through theincorporated A/D converter. Based onthisconversion,thisdevice performs interpolation
duringpixel extension. The source voltage for thisdevice is 3.3V, 2.5V and the systemclockfrequencyis14.318
MHz. The withstandvoltage level for theinput signalvoltageofI304 is 3.3V and 5V.
5.Systemreset, LEDcontrolcircuit(CircuitdiagramMAIN PWB 4/5,2/5)
5.1System reset
System reset is performed bydetecting therising and falling ofthe 5Vsource voltageat I305.
5.2LED control circuit
Green /amberis lit with the controlsignal ofthe LEDGREEN andLEDAMBERsignal pin 34, 33 fromI304

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f1723/FP7317/L1702 /vf17/FP17
6. E2PROM (Circuit diagramMAIN PWB 4/5)
Data transferbetween I307 (24LC16) andScallerIC I304 is effectedthrough theIICbus SCL(pin 37) andSDA(pin
36) of I304. The data to betransferred to eachdevice are stored in I307.
l I304 control data.
l OSD related setting data.
l Other control data forservice menu.
7.Controller circuit(Circuit diagramMAINPWB4/5)
ScallerIC I304 functions as theController.
Thesourcevoltagefor thedeviceare 3.3V and 2.5V and the system clockfrequencyis14.318MHz.
7.1Detection of POWER switch status
The CPU identifies the ON status of the twopower supplies. The identification is made when the power supply
isturned off. For example,ifthepower supply isturned off withthePOWER switch, thePOWER switchmustbe
turned onwhenactivating the powersupplyagain.Ifthe powersupplyisturnedoff bypulling outthepower
cord, thenthis power supplycanbe turned onbyconnectingthepower cord, withoutpressingthe POWER
switch.
7.2Display modeidentification
7.2.1Functions
(1)Displaymode identification
l The displaymode of input signal is identified basedon Table 1.
l When the mode has been identified through the measurement of horizontal and vertical frequencies, thetotal
number of lines is determined with a formula of Horizontalfrequency/ Vertical frequency= Totalnumber
of lines. Finalidentificationcanbe madebyexaminingthecoincidenceoftheobtained figure withthe
number oflines for the mode identifiedfromthe frequency. The boundary numberof linesin each modeis
shown in Table2.
l When the detected frequencyifthe sync signalhaschanged, the total number of lines should be counted even
though it is an identified frequencyin the same mode.
(2) Powersavemode.
The power save mode is assumed when the horizontal / vertical signals are as specified below.
l If there is no horizontalsync signal input.
l If there is no vertical sync signal input.
l If the horizontal syncsignal is outsidethe measuring range of gm2121.
l If the verticalsync signal is outside the measuring range of gm2121.

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f1723/FP7317/L1702 /vf17/FP17
PolarityMode
ResolutionH-freq
(KHz)
BandWidth
(MHz) HV
1.VGA640 x480 60Hz31.47
25.175--
2.VESA640 X48072Hz37.86
31.5--
3.VESA640 X48075Hz37.531.5--
4.VGA720 x400 70Hz31.47
28.322-+
5.VESA800 x600 60Hz37.88
40 ++
6.VESA800 x600 72Hz48.08
50 ++
7.VESA800 x600 75Hz46.88
49.5++
8.MAC 832 x624 75Hz49.72
57.283--
9.VESA1024 x768 60Hz48.36
65 --
10.VESA1024 x768 70Hz56.48
75 --
11.VESA1024 x768 75Hz60.02
78.75 ++
12.MAC 1152 x87075Hz68.68
100 --
13.SUN 1152x90 76Hz71.71
105.6--
14.SXGA1280 x102460Hz64 108 ++
15.SXGA1280 x102475Hz80 135 ++
Table 1

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f1723/FP7317/L1702 /vf17/FP17
7.3User Control
7.3.1Related ports andpinof I304
IndicationresolutionThe numberofthe
distinctionlines
DistinctionVsync
640 x480487 <LINE < 607fV< 63Hz
63 Hz<fV< 68Hz
68 Hz<fV< 74Hz
74 Hz<fV< 78Hz
800 x600607 <LINE < 777fV< 58Hz
58 Hz<fV< 63Hz
63 Hz<fV< 73Hz
73 Hz<fV< 78Hz
832 x624640< LINE -
1024 x768 768 <LINE < 870fV< 63Hz
68 Hz<fV< 73Hz
73 Hz<fV< 78Hz
1152x864 870 <LINE< 1031
1280 x960 960 <LINE< 1027
1280 x1024 1027 <LINE
7.3.2Functions
Controlis effected for the push-switches to be used when the user changes the parameters, in order to modify the
respective setting values.Whether the switchhasbeenpressedisidentifiedwith theswitch inputlevel that is
turned L”.
Each switch input port is pulled up atoutside of ASIC
Each parameter is stored in the EEPROM,the contents of which areupdatedas required.
.
Port Pin No. I/O
Signal name
Function Remarks
GPIO3 I304, 26
IMENU EXIT/ENTER switch input
GPIO7 I304, 32
IMINUS switch input Auto-Adj.
GPIO6 I304, 29
IPLUS switch input
GPIO21
I304, 16
IPOWER soft power switch input
Table 2 the number of the lines, Vsync distinction

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f1723/FP7317/L1702 /vf17/FP17
7.4Control of definition converter LSI
7.4.1Functions
Major function of I304 are as follows:
(1)Expansion of the displayscreen.
(2)Timing control for various signal types.
(3) Power-supply sequence(LCDpanel).
7.5I
2
C bus control
7.5.1I
2
C-controlled functions
Thefollowing functional controls are effected by I2C.
(1) ControlofEEPROMI307 for parametersetting.
(2) Control ofaudio preamplifier.

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f1723/FP7317/L1702 /vf17/FP17
7.6Power ONsequence
When the POWER switch is pressed, thePOWER signal is turned L”. When this L”potential is detected, the
CPUbegins toestablish the respective powersuppliesaccording to the sequence shownbelow.
AB
Panel-AU 0msmin250 msmin
Panel-HD 20~50 ms500 msmin
Panel-LG 0.01~50 ms200 msmin
Panel_VCC
Backlight
Panel_DATA