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Dell L400 - page 1
www .dell.com Dell™ Latitu de™ L400 SERVICE MANUAL ...
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Dell L400 - page 2
Notes , Notice s, an d Cautio ns Thro ughout t his guide, bloc ks of te xt ma y be ac companied b y an i con and prin ted in bold type or in it al ic t y pe. Thes e blo c ks a re no tes , noti ces , and caut io ns, and they ar e us ed as follows: NO TE : A NO TE indic ates imp ortant info rmation tha t helps y ou make bet ter use of y our computer ...
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Dell L400 - page 3
v Contents Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Prep arin g to Wor k Insid e Yo ur Com pu ter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Screw Identif ication and Ti ghtening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ZIF Connect ors . . . . ...
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Dell L400 - page 4
vi Figu re 6 . Hard- Disk Dr ive A sse mbly R emo val . . . . . . . . . . . . . . . . . . . . . . . 7 Figu re 7 . Keyb oar d Be zel Rem oval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 8 . Displa y As semb ly R emov al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 9. Dis play Assemb ly Be zel Re m ...
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Dell L400 - page 5
suppor t.del l.co m Dell L atitude L40 0 Ser vice Manu al 1 Dell™ Latitude™ L400 Service Manual Th is manual pro vides instr uctions f or removi ng and replacing field-r eplaceable components, assemblies, and subassemblie s in your Dell Latitu de com puter . Unless other wise noted, eac h procedure in this manual ass umes the foll owing conditi ...
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Dell L400 - page 6
2 Dell Lati tude L40 0 Se r vi ce Manu al R e commended T ools Most of the procedures in this manual require the use of one or more of th e f ollo wing tools: • #0 and #1 magnetiz ed Phillips- head screw drivers • Small fl at-blad e screw driv er • 5-mm soc ket wrenc h • Small plast ic scribe • Needle-nose plier s P reparing to W ork Insi ...
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Dell L400 - page 7
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 3 Fi gure 2. M ain Battery Assembly R emoval 9. Ground y ourself b y touc hing the unpainted metal surface of an I/ O connector on the bac k of the computer . NOT ICE: While you wo rk, per iodical ly touch the I/ O pane l to dissipa te any s tatic ele ctricit y that mi ght harm compone nts. ...
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Dell L400 - page 8
4 Dell Lati tude L40 0 Se r vi ce Manu al When you are remo ving and replacing components, photocop y the T able 1 placement mat as a tool to lay out and k eep trac k of the component scre ws. T able 1. Scr ew Placement Mat Wit h Component Scr ew Counts and Sizes Hard-Disk Dr ive Assembly: M3 x 3 mm (2 eac h, blac k) Displa y Assembly Hinge to Base ...
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Dell L400 - page 9
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 5 ZIF Connectors Some of the computer ’ s interf ace connectors are z ero inserti on fo rce (ZIF) connectors. The se connectors are not remov able, but the y must be released to disc onnect a cab le from them (see Figure 4). Fi gure 4. Disconnecting an Interface Cable NOTICE: The ZIF con n ...
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Dell L400 - page 10
6 Dell Lati tude L40 0 Se r vi ce Manu al R e moving Fi eld-R eplaceable P arts and Assemblies Fi gure 5. Exploded View—Computer display assemb ly keyb oa r d palm rest assemb ly sy stem bo ard asse mbly hard-d isk drive main batter y bot tom case asse mbl y righ t hing e cover left hinge co ver audio EM I shield audio I/O po rt cover keybo ard b ...
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Dell L400 - page 11
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 7 T he foll owing subsec tions pro vide instr uctions f or remov ing and replacin g field-repl aceable part s and assembl ies. Hard-Disk Drive Assembly Figure 6. H ard -Disk Dr ive A ssem bly Removal NOTICE: T o avoid dam aging the syste m board, you mus t remove the main batte ry before you ...
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Dell L400 - page 12
8 Dell Lati tude L40 0 Se r vi ce Manu al Ke y b o a r d B e z e l Figure 7. K eyboard Bezel Removal NOTICE: T o avoid damagi ng t he syst em b oard, you mu st rem ove the main batte ry before you service the computer . NOTICE: T o avoid dama ging the m icrophon e, d o not put a ny objects into the microp hone hole (s ee Fig ure 7). 1 . Place th e ...
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Dell L400 - page 13
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 9 Display Assembly Fi gure 8. D isplay Assembly Removal NOTICE: T o avoid dam aging the syste m board, you mus t remove the battery before you servic e the computer . 1 . Re mov e the ke yboard bez el. 2. Close the displa y . 3. Remo ve the tw o silv er M2 x 4- mm screws at the ba c k of the ...
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Dell L400 - page 14
1 0 Dell Latit ude L4 00 Ser vice M anual 6. T urn the c omputer right -side up. 7 . Open the displ ay . 8. R emov e the lef t and ri ght hinge c ov ers. NO TE: When replacing the displ ay assembly , the lef t hinge cov er must go o ver the lef t hinge and the right hin ge cov er m ust go ov er the right hinge. Th ey are not int erc hangeable. An L ...
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Dell L400 - page 15
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 1 1 7 . R einstall the two M2 x 4-mm scre ws in t he bac k of t he computer that secure th e display asse mbly to the bac k of the bot tom case. 8. Tighten the two scre ws that you ins t alled in step 6. 9. Open the displa y and reinst all the lef t and right hinge co ver s. An L is stamped ...
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Dell L400 - page 16
1 2 Dell Latit ude L4 00 Ser vice M anual NOTICE: T o avoid damagi ng t he syst em b oard, you mu st rem ove the main batte ry before you service the computer . 1 . Use a scribe to caref ully pr y the six ru bber scre w cov ers out of the six scre w holes located alo ng the top and bot tom of the bez el on the front of the displa y assembly (see Fi ...
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Dell L400 - page 17
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 1 3 T o replace the displa y-assembl y latc h, perfor m the foll owing steps: 1 . Carefu lly place the latc h spring o ver t he post on the displa y-assembly t op co ver . Y ou may need to use a small flat- blade scre wdriv er to place the spring o ver the post. Hold the spring on th e post ...
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Dell L400 - page 18
1 4 Dell Latit ude L4 00 Ser vice M anual 2. R emov e the ke yboard bez el. 3. R emov e the displa y assembly . 4. R emov e the displa y assembly bez el. 5. R emov e the four M2 x 3.5-mm sc rews on the lef t and right sides of the displa y assembly that secure the LCD panel t o the top cov er (see Figu re 1 1). 6. R emov e the M2 x 3.5- mm screw th ...
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Dell L400 - page 19
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 1 5 b. Lo wer the bot tom end of the LCD panel into the top co ver , making sure the LCD fle x cable lines up with the openi ng that is to the right of the lef t hinge. c. Mak e sure the narro w part of the flex cab le that goes to the in verter is visible at the bot tom edge of the LCD pane ...
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Dell L400 - page 20
1 6 Dell Latit ude L4 00 Ser vice M anual Ke y b o a r d A s s e m b l y Figure 12. K eyboard Assembly Removal T o remo ve t he k eyboar d assembly , perf orm the f ollo wing steps . NOTICE: T o avoid da magin g the syste m board, y ou must rem ove the main batt ery before you servic e the computer . NOT ICE: Mak e sure tha t the work surface is cl ...
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Dell L400 - page 21
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 1 7 NOT ICE: The key caps on the k eyboard are fragile, easily dislodged, and time - consu ming to replace. Be carefu l when rem oving and handli ng the k eyboard. 6. R emov e the ke yboard a ssembly . T o replace the k eybo ard assembl y , perf orm the f ollo wing steps. NOTICE : Position t ...
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Dell L400 - page 22
1 8 Dell Latit ude L4 00 Ser vice M anual Memory Module Figure 13. Memory Module Removal NOTICE: T o avoid damagi ng t he syst em b oard, you mu st rem ove the main batte ry before you service the computer . 1 . R emov e the ke yboard bez el. 2. R emov e the ke yboard assembly . 3. Ground y ourself b y touc hing the unpainted metal surface of an I/ ...
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Dell L400 - page 23
support .dell .com Dell Latitude L 40 0 Ser v ice Ma nual 1 9 3. Piv ot the memor y module down unt il it clic ks into place. If y ou do not hear a clic k as eac h end of the memor y module snaps into the tabs, remov e the memor y m odule and reinstall it (see Figure 1 3). P almrest Assembly Fi gure 14. Removing the Palmrest Asse mbly Bottom Screws ...
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Dell L400 - page 24
20 Dell Lati tude L40 0 Ser vice Ma nual 7 . R emove th e four blac k M2 x 4-mm screws across the top of the computer (see Figu re 1 5). Figure 15. R emovi ng the Palmrest Assembl y T op Screws 8. R emov e the three silv er M2 x 6-mm scre ws in the k eyboar d-assembly area that secur e the middle of the palmrest assembl y to the bot tom case (see F ...
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Dell L400 - page 25
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 21 T o replace the palmres t assembly , perf orm the foll owing st eps: 1 . Place the palmres t assembly on the bot tom assembly . 2. R einstall the three silv er M2 x 6-mm scre ws in the ke yboard-as sembly area that secure the middle of the palmrest asse mbly to the bot tom-case assembly ( ...
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Dell L400 - page 26
22 Dell Lati tude L40 0 Ser vice Ma nual 2. R emov e the displa y assembly . 3. R emov e the ke yboard assembly . 4. R emov e the palmrest assembly . 5. R emov e the three M2 x 3.5-mm screws tha t secure the touc h pad assembly t o the palmr est assembly (see Figure 16 ). 6. Slide the touc h pad assembly out from under the t wo hol d-down tabs. 7 . ...
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Dell L400 - page 27
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 23 R eserve Battery Figure 18. R eserve Battery Removal NOT ICE: The reserve battery provid es power to the computer's RTC and nonvolat ile random -access me mory (NVR AM) when th e com- puter is turned off. Removing the ba ttery cau ses the compute r to lose the dat e and time informa ...
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Dell L400 - page 28
24 Dell Lati tude L40 0 Ser vice Ma nual Mode m Fi gure 19. Modem Removal 1 . R emov e the ke yboard bez el. 2. R emov e the displa y assembly . 3. R emov e the ke yboard assembly . 4. R emov e the palmrest assembly . 5. Use a 5-mm soc k et wrenc h to remov e the four 5-mm soc ket scre ws for the V G A and parall el ports l ocated on t he bac k of ...
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Dell L400 - page 29
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 25 T o replace the modem, perf orm the follo w ing steps: 1 . Connect the modem cable to the connect or on the syst em board. 2. Align t he connector on the bot tom of the modem with the co nnector on the sy stem board, and careful ly press the modem onto the sys tem board. 3. P ut the modem ...
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Dell L400 - page 30
26 Dell Lati tude L40 0 Ser vice Ma nual 4. R emov e the palmrest assembly . 5. Carefull y disconnect the f an wire connector from the syst em board (see Figure 20) . T he male connector on the f an w ire is k ey ed to fit in to the f emale connector one w ay only . 6. Remo ve the t wo M2 x 8-mm scre w s with double r ubber w ashers t hat secure th ...
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Dell L400 - page 31
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 27 Speaker Figure 21. Speaker Remova l 1 . Re mov e the ke yboard bez el. 2. R emov e the displa y assembly . 3. R emov e the ke yboard a ssembly . 4. R emov e the palmrest assembly . NOT ICE: T o ensure maximum cooli ng for the microprocesso r , do not touch t he glue sid e of the t hermal ...
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Dell L400 - page 32
28 Dell Lati tude L40 0 Ser vice Ma nual NOT ICE: The audio EMI shield is att ached to the USB conn ector hous ing wi th two - side d ta pe. T o avoid bend ing the a udio E MI shie ld, care must be tak en when separating the audio EMI shield from t he USB connect or housing . 6. Using a small flat- blade scre wdriv er , carefully separ ate the audi ...
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Dell L400 - page 33
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 29 7 . R einstall the palmrest assembly . 8. R einstall the ke yboard assembly . 9. R einstall the displa y assembly . 1 0. Rei nstall the ke yboard bez el. System B oard Assemb ly 6 Figure 22. System Board Assembly Removal T o remov e the sy stem board assembly , perf orm the follo wing ste ...
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Dell L400 - page 34
30 Dell Lati tude L40 0 Ser vice Ma nual NOTICE: T o avoid damagi ng t he syst em b oard, you mu st rem ove the main batte ry before you service the computer . NOT ICE : The proce ssor is not r eplacea ble. Do not attempt to remove the th erma l cool ing soluti on. 1 . R emov e the ke yboard bez el. 2. R emov e the displa y assembly . 3. Remo ve th ...
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Dell L400 - page 35
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 31 1 3. Remo ve the modem retainer brac ket fr om the bot tom case assembly . 1 4. Disconnect the speak er wire from the connector on the sy stem board assembly . 1 5. Disconnect the fan wire fr om the connector on the sy stem board assembly . 1 6. Lif t the sy stem board assembly out of the ...
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Dell L400 - page 36
32 Dell Lati tude L40 0 Ser vice Ma nual One of the M2 x 3.5-mm scre ws passes t hrough the h ard-disk dri ve EMI clip (see Figure 23) . 9. R einstall the audio EMI shield. a. Carefull y position the audio EMI shiel d so the section with the two-sided tape is ov er the USB connector housing. b. Pr ess the audio EMI shield do wn so it at tac hes to ...
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Dell L400 - page 37
support .dell .com Dell Latitude L4 0 0 Ser v ice Ma nual 33 1 . Re mov e the ke yboard bez el. 2. R emov e the displa y assembly . 3. Remo ve the ke yboard. 4. R emov e the palmrest assembly . 5. Remo ve the sy stem board. NOTICE: The tabs on the release button are plast ic. Care sh ould be tak en when sq ueezing the tabs to avoid breaking them. 6 ...
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Dell L400 - page 38
34 Dell Lati tude L40 0 Ser vice Ma nual T o replace the APR doc king doors, pe rfo rm the f ollow ing steps. NO TE: On the under side of the doors, a small F is printed on the front door and a smal l B is printed on the bac k door . A s you hold the doors f or installation, the fro nt door i s near y ou, the bac k door is a wa y from y ou, and the ...
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Dell L400 - page 39
Index 1 Inde x A APR docking doors removal , 33 B bottom assembly components, 22 illus trated, 22 D display ass embly bezel remov al, 11 hinge removal, 15 latch re mova l, 12 rem oval, 9 F fan r emova l, 25 field-repl aceable pa rts and assemblies i llustrated, 6 G grounding to di ssipate static electrici ty, 3 H hard-dis k drive a ssembly removal, ...
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Dell L400 - page 40
2 Dell Lati tude L40 0 Se r vi ce Manu al R rese rve batte ry re mov al, 23 S screw ident ificatio n and tigh tening, 3 speaker r emoval, 27 system board assembly removal , 29 T tools, 2 touch pad removal, 21 Z ZIF connect ors, 5 ...
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