BenQ DV M21 User manual

BENQ
DVM21
servicemanual

Preliminaryversion
2009/12/11
Content
1.Aboutthismanual.....................................................................................2
2.Safetyprecaution......................................................................................2
3.Thefirmwareupdateprocedure...............................................................2
4.DisassemblyProcedure.............................................................................6
5.TheTroubleshootingguide.....................................................................17
6.TheBillofMaterial..................................................................................22
7.Schematicsdiagram................................................................................40
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2
1. Aboutthismanual
Thisservicemanualcontainsinformationformaintenanceand
serviceofDVM21;highdefinitioncamcorder.Themanualmight
guide&helpyoutodothesystemdiagnostics,Firm/Wareupdate
andtheproducttroubleshooting.

2. Safetyprecaution
2.1 ThisproductcontainsHighVoltagecircuitmighthurtsservice
peoplewhomwithoutelectronicknowledgeorinadequate
training.
2.2 WarningtoaCardiac,foryourhealthy&avoiddangeroushigh
voltageelectricshock,westronglysuggestyoudonottryto
opening&servicingthisproduct.
2.3 BesuretodischargetheHighVoltagestorageenergypriorto
disassemblytheenclosure.
i.e.removeentirelypowersources(Li‐ionbattery,AAbattery&
USBport)&wait30minutesforcircuitryselfdischarge.

3. Thefirmwareupdateprocedure
3.1 Installtheupdatetool,(“DU,DirectUSB”)inyourcomputer.
3.2. Launch“DU”utility,thenthedialogueboxwillappearas
below.

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3
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3.3. ConnecttheUSBcablebetweenPC&Camcorder.
3.4. Configuretheproduct;selectyourmainboardconfiguration&
DRAMspeedthatmeetsyourcamcorderspecification.
3.5. Therearetwosourcepaths;oneisforentirelyerasingtheflash
memory,andanotheroneisforquickupdatepurpose
respectively.
3.6. The“BootLoader”pathisforentirelyerasingtheflashmemory
whenfataldesignchanges.
3.7. Usingthe“BootLoader”pulldownmenutobrowsethelocation
ofspecialerasing/replacementfirmwareprovidedbytheDSP
supplier;named“amboot_kernel_fomfs_dsp_release.elf.bin”.

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3.8. Usingthe“Firmwareprogramming”pulldownmenutobrowse
thelocationofnewfirmwaretobeupdated,e.g.C:\Documents
andsetting\Myfile\Programmingcodes\
amboot_xx_xxx_dsp_releasexx.elf
3.9. Forquickupdate;select“Firmwareprogramming”optioncheck
&press“Connectbutton”toconnectcamcorderandthenpress
“Download”buttontoupdatenewfirmware.
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3.10. Forfataldesignchangewillerasetheoldfirmwareresidentin
thecamcorderfirst,otherwisethecamcordermightwork
improperly.

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3.11. Select“BootLoader”optioncheck&press“Connectbutton”
toconnectcamcorderandthenpress“Download”buttonto
entirelyerasingtheflashmemory.
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3.12. Andthenexecutionstep3.9quickupdateFirmware,thenyour
camcorderhasbeencompleteupdated.
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4. DisassemblyProcedure
4.1. Toolused:
Atweezers,ascrewwrench,amagnetic,anantiESDsponge,an
ESDdischargingwriststripandasolderiron.
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4.2. BesuretofullydischargetheHighvoltageenergypriorto
disassembletheunit,refertoSafetyprecautionsection2.2
~2.4.
4.3. Stickingasmallmagnetonthewrenchtipasphotoshown
belowforeasyhandlingthesetinyscrews.

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4.4. Releasebothscrewsasphotoshownbelow:

Note:(0.7kgf‐cm)torquescontrolisessentiallyforre‐assembly
otherwiseovertorquemightpermanentdamagetoyour
camcorder.

4.5. Then,releasebottomsidescrews:



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4.6. Then,releasebothIOboard’sscrewsundertherubbercover
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4.7. Pull&partiallyopenthefrontendoftheLCDmodulecarefully.

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4.8. PartiallyopentherearendoftheLCDmoduleverycarefully,
otherwisetheflatcables,FPCB,connectbetweenLCM&main
boardwillbedestroyed.

Note:That’salittletoughtodisassembletheLCDmodule;
coursedof4ribs/hooksclampinner.Pleasebepatientandtake
yourtime.
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4.9. Releasetheedgescrewverycarefully,don’tdamegetheFPCB,
FlatCable.

ImportantNote:That’saspecialdesign;narrowheadscrew
dedecateforhere,limitspace;wrongtypeofscrewusedmight
causedFPCBcabledemage.
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4.10. Peelofftheyellowtapesusingthetweezers.
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4.11. UnlocktheFPCBconnector’slatch&releasetheFPCBcables.

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4.12. TheLCMisdisassembled.
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4.13. ReleasetheGNDscrew,that’sanISOmachinescrew,M1.4x
2.5mm,it’sshorterthanothers.

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4.14. Releasethelongtappingscrew,TP1.4x6mm.
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4.15. Releasethetappingscrews,TP1.4x3.5mm.
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4.16. Removebuttoncontrolmodule.

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4.17. Peelofftheyellowtape&de‐solderingthespeakerwires.

4.18. SlideitouttheCoreEnginemodule.
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4.19. TheCoreEnginedisassembled.
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4.20. Releasethesescrews,TP1.4x3.5mm.
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4.21. Disassemblethezoomingmodule,
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4.22. ReleaseStrobemodule’sscrews,M1.4x2.5mm.
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4.23. Releasethescrew,TP1.4x3.5mm.

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4.24. Removethespeaker&thestrobemodule.

Caution:
TheECcapacitormightstoragearound400VoltsDC,highvoltage
energy,Pleasehandlewithverycarefully.
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5. TheTroubleshootingguide
5.1 Powerfailure
5.1.1PowercoldstartfailurewithUSBPowersource
zCheckboardtoboardinterconnectors,PCONI&MCON2,isit
improperlyjoins?
zChecksolderjoinoftheUSBconnector,isitpoor
workmanship,crackingopenorsomehow?
zCheckPF1&PD4withamulti‐meter,isitwork?
zTestPU2;PIN5isit3.3Voutput?
zTestPL2,PL3,PL4,PL5,PR40arethey1.8V,1.2V,5V,3.3V,
2.5Voutputrespectively?
zIsitF/Wdatalosefailure?Ifyes;doF/Wupdateonce.

5.1.2 PowercoldstartfailurewithAAbatterypowersource
zCheckthebattery’scontactspring,isitdeform?
zCheckboardtoboardinterconnectors,PCONI&MCON2,isit
improperlyjoins?
zTestPU6;PIN5isit4.5Voutput?
zCheckPF1withamulti‐meter,isitwork?
zTestPU2;isit5Voutput?
zIsitF/Wdatalosefailure?Ifyes;doF/Wupdateonce.
zChecksolderjoinoftheDSP,isitpoorworkmanship,
crackingopen,intermittent?OrDSPfail.


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5.1.3 PowercoldstartfailurewithLi‐ionbatterypowersource
zCheckboardtoboardinterconnectors,PCONI&MCON2,isit
improperlyjoins?
zCheckthebattery’scontactspring,isitdeform?
zCheckPT26,PT27&PC17,isitpoorworkmanshipcaused
circuitshort?
zTestPU6;PIN5isit4.5Voutput?
zCheckPF1&PFB1withamulti‐meter,arethosegood?
zTestPU1pin6&pin7withanoscilloscope,isVBATTsignal
normal?
zTestPL2,PL3,PL4,PL5,PR40arethey1.8V,1.2V,5V,3.3V,
2.5Voutputrespectively?
zIsitF/Wdatalosefailure?Ifyes;doF/Wupdateonce.
ChecksolderjoinoftheDSP,isitpoorworkmanship,
crackingopen,intermittent?OrDSPfail.
5.2 LEDfailure
zChecksLED2,LJ1,MJ3&BJ1arethosepartsshort,openor
intermittent?
zTestPQ8pin5withanoscilloscope,isVBATTsignalnormal?
zCheckboardtoboardinterconnectors,isitimproperlyjoins
orintermittent?
zCheckPR34‐512M,PR38‐100Karetheynormal?
zCheckPL6,switch,isitnormal?

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5.3 Soundfailure
zCheckSpeakerwires,coldsolder,brokenornot?
zCheckSpeakerimpedance,iscorrect?
zTestMU1&MR7,isitaround3.3V?
zTestSpeaker,isitaround1.9Vrms?
zCheckboardtoboardinterconnectors,PCONI&MCON2,isit
improperlyjoins?
zCheckMJ4&HR1;isitpoorworkmanshipcausedcircuit
openorshort?
zTestMCON2pin16&pin17withanoscilloscope,areclock&
datawaveformsignalnormal?
zChecksolderjoinoftheDSP,isitpoorworkmanship,
crackingopen,intermittent?OrDSPfail.
5.4 FirmwareProgrammingfailure
zTestMX1,Mx2&Mx3withanoscilloscope,arethoseclock
waveformsignalnormal?
zTestMQ7,MQ8,MQ5,MD2,MD3&MD5withan
oscilloscope,arethosekwaveformsignalnormal?
zTestPR10&PR14;arethey5V&3.3Vrespectively?
zReplacetheFlashmemory,iffailatprogrammingprogress.
zCheckPL9;isitcoldsolderoropen?
zTrytoreplaceDDRmemory,ifnofixedbyaboveFlash
replacement.
zReplaceDSPeventuallyifnomemoriesproblems.

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5.5 PCconnectionfailure
zCheckFlashIC,isitcoldsolderjoin?
zReplaceFlashIC

5.6 SDCardfailure
zDatawriteprotected/disabled.
¾IsSDcarddeforming?
¾IsSDcard/goldenfingercorrosion?
¾ReplaceanewSDcard.
¾CheckSDconnector,isitcoldsolder?
¾CheckSDconnector,innercontactpins,istheydeform?
¾CheckSDconnector,innercontactpins,istheycorrosion
causedhighcontactresistance?
zSDnotdetected,orsystemhangsbyplugSDcard.
¾IsSDcarddeforming?
¾IsSDcard/goldenfingercorrosion?
¾CheckMR16,MR116,MR18,MR9&MR14,istheycold
soldering,wrongparts,orresistancewereabnormally
changing?
¾ReplaceDSPeventually.
5.7 AVoutputfailure
zDarkscreenorasynchronous
¾CheckAVcableisproperconnectedbetweenTV&
Camcorder?
¾CheckPJ4,isdeforming,coldsolderingopenorshortor
poorcontact?