1.Acer 4738 Quanta ZQ9 Totally death .
Current usage 0008 amp .Open Quanta ZQ9 schematic on Page 37 to measure adp+ circuit need .This acer using 19V adp+ Voltage.Checking PQ13 N channel source pin 5,6,7,819V present.PQ 14 N channel source same way to check PQ 13 .This both upper n channelare power source for 3V and 5V_ALW need. RT 8206 (dc pwr sply) controlling trigger gate driver trough pin 4 gate PQ13 and PQ14 andsupply 3V_and 5V motherboard powerneed requirement to live..There is no trigger for both of 3V_5V system it mean there are no power for VSB(voltage switch button) ,Bios ic,EC ,SB .this motherboard even can't switch . Analyses goes to RT 8206B as a gate trigger .checking main power input for RT8206B trough VIN pin 5 (19V present) checking ONLDOinput pin 4 (9V present) it mean all power input available for this IC. checking LDO output Zero .in normal condition if VINand ONLDOpresented LDO should get output for 5V.this voltage become VL signal enable to activated 5V_EN and 3V_EN .without this gate triger for 3V_5V system will not present .suspected this IC damage take off from circuit board before replace with a new one checking LDO output for feedback...tes continuity 0000 ohm to the ground..using PSU set 5V started pushing current 1amp and found caps PC70 become warm andchecking continuity positive this PC70 cause a feedback and hold LDO output .replace caps and put back RT8206B .Testing bothgate Nchannel 3V dan 5V trigger available .checking PL13 5V_ALW present ,checking PL 14 3V_ALW present .Problem Solved.
2.Acer AOD 756 LA 8041P No Back light on Led ,I have Check LVDS panel Led Vout present for 19V ,inv_PWM 3.3V present i have checkLed cable also fine .open the led board and found F2 damage ,change with good one .Problem solved with out changingLed Monitor.Thiscan be happento other 30 pin Led also.3.Apple 820-2610-A totalydeath ,no green light ,no PPVIN on TPS 51120,no PP18V5 on 1 wire section .Q6915 leak and short to ground.replace Q6915 problem solved.
3.Apple 820-2610-A totalydeath ,no green light ,no PPVIN on TPS 51120,no PP18V5 on 1 wire section .Q6915 leak and short to ground.replace Q6915 problem solved.
4.Apple Macbook air A 1237 (820-2179) totally death ,14.5 V already have in TPS 51120 pin 22(Vin) but no Vreg3 andVreg5 output present.before claim TPS 51120 damage i check Vreg3 and Vreg5 LDO output by diodetestbuzzer 0001 ohm,testcontinuity to the ground also0001 ohmpositively there is a feed back on Vreg 5 line .pull tps 51120 out than inject 5V using PSU tofinding shorted componenton thatline to save time and found Caps C 7604 become hot and replace with good one than put TPS 51120 again on place and Vreg3 present for 3.3V and Vreg5 present 5V.current monitoring on PSU goes up to 0.8a .it's mean board isswitch on it self .I put adapter of concerning hitsink fan not install yet to avoid chip and processor damage.after that ,test it again well fan running without switching.
5.Apple 820-2330-Adetect-read-backup-erase-reprogram ,error on verifying-replace bios ic-reprogramwith original backup.
6.Asus K42jr Rev 4.0 No display ,current usage 1.2amp checkingPLT_RST# present present for 3.3V .i dont touch any main bios firmwareVccore 1.1VS present,Vccramfor ddr3 1,5V present ,VTT 0.75 present.Checking bypass checking SB_VCC cause PLTR_RST# PCHpower good already present at the begining..Checking +AVDD_ATI 1.8V present,+A2VDD_ATI 3.3Vs Present ,+DPLL_VDDC_ATI 1,1VSalso present ,no more suspect faultyon Graphic chip .checking Quad Mux/DeMux Bus Switch IC PI5C3257QE ,VCC present for +5VS noEDID_DAT_VGA and EDID_CLK_VGA for ATI M92 VGA CHIP ,no L_VDDEN output signal for 3.3V ,checking L_VDDEN_PCH enablesignal from HM55 Southbridge not present .ReballingHM 55 L_VDDEN_PCH present and all missing signal for ATI M92 VGA CHIP present,L_VDDEN output signal for 3.3V for LVDS present .current usage 2.1amp . Problem solved.
7.Hp DV 2 Quanta QL 6 Power Drop after switch on ,Identified Boot DeviceInductors there are no feedback at all ,measuring any boot updevice power rail by holding up avometer on each inductors while switching on got all power need for 1 second before losing the power.checking VTT on PU 4(no inductor) also get 0.9VTT memory terminator before power drop.Checking +VGA1.1V(no inductor)on PU 5=0V.checking PU5 Source +1.8V available,mainon VENable also present 3V.but VO(Voltage Out) for +VGA1.1V =0V.check for feedback gotbuzzer 0001ohm and pull up L37 to cut the line .short gone.checking on other L37 side pin feedback still presented .Inject voltage for 1V~2.0a Nvidia NB9M getting hot.concluding feedback coming from this chip pull up the chip with BGA Machine and check feedback againto make sure there is no other shorted on circuit evidently still have a feedback.inject again 1V~2.0a found C638 burned .pull it up shortedgone.Reball the chip with already removed and put it back .checking feedback again are gone.testing switch again power after switchrunning stable but nopost.checking all boot device again all voltage rail presented.drain for induction by pressing power button for 40second and change memory sodim just in case but still no post on external display .current usage showed 1.4A.this should be anormalconsumption on whole circuit for boot strap .Start thinking failed on rebaling process before reiterate BGA procedure try to checkwith internalLed .evidently already display .hopefully be an inspiration.
8.Hp G 42 (AX2/7) AMD with SB 820 south bridge no post ,Current usage 0.7amp . missing PCI_RST and NB_PLTRST,with no check for SUS_C signal .than reball SB820 with no results.before decided to replace with new one,i check bat Cmos .got some case on AMD's wontresponse if bat cmosremoved or on low power . .i found cmos on good condition and trace +AVBAT not reach into SB820 pin B1 and B2through R469 ..wondering if this power missing motherboard should can't be switch on cause +AVBT should charging by +3VPCU withsupply EC to activate micro controller .trace +AVBT found D23 diode no issue but +3VPCU present .it mean EC got +3VPCU .change D23and got VDDBT_RTC_G to powered crystal input power to run clock system on SB.Check SUS_C again signal available for 3V.than currentusage 1.2amp .check on external display problem solve.
9.Intel® ME: Management Engine Driver for Intel 5 Series Chipset have to be flash on HM 55 after replace the Chip,i found on Apple,Toshiba,Asus ,HP and compaq after replace intel HM 55 Southbridge they where work fine and restart after 30 second .We should edit themain bios (only for separated Ec and Main bios) and instal ME Region on main bios using Fit C software to solving the problem.
10.Toshiba L745 MotherboardTE5 can't switch on problem .19V_5V and 3V are present ,NBSWON# signal on Power switch buttonconnector (CN2) Missing ,check EC Bios power 3.3V on pin8,7 and 3 Present.reprogram EC bios (U13) 512KB NBSWON# on SW comingfor 3.3V but still same problem.tracing NBSWON# directly to Nuvoton (EC)pin 96 ,3.3V present ,short NBSWON# to the ground 3.3Vbecome 0V and back to 3.3V (switch signal response)...Toensure EC firmware,bios ic and EC good i got 3.3 V on RSMRST# pin 75 NPCE791LAODX .and than check DNBSWON# 3.3V also present but no SusC# return signal from SB to EC .trace SUSC# continuity from SBtoEC they where connected .no PLT_RST# signal .to ensure this cause Main bios Firmware reprogram Main Bios U6 (4mb) with testedfirmware stillgot no PLT_RST# signal .Checking Caps on HM55 (SB) chip all pin shorted to ground ,Take off HM 55 and shorted gone.Reball HM55 and put them back carefully using CF 260(BGA melted on 245'C) .let them cool for half an hour than check SUSC# signalpresent .Switch on problem Solved.
11.Lenovo G400 La 9632P totally death check 20V is coming to supply SMPS PU 401 and Enable pin present for 3V but LDO 0V.lift PU 401check there is a feed back on pin 5 LDO out .inject 3V KB 9012 become hot ,there is no possibility other component short on that line,lift KB9012 feedback gone .Replace KB 9012 switch on 3V coming but no display .current usage only0.2 amp on my PSU current monitor . I needto reprogram this KB 9012 for Lenovo G400 LA 9632P using RT 809F programmer to flash EC Firmware to KB 9012 SLP_S3 and SLP_5coming ,current usage 1.4Amp but still no display on external monitor ,put the laptop original Led current usage become 1.7Amp and boot upprocess working fine.
12.Acer ZE 7 Missing LCDVCC3V no video for Led power change U 19output pin 1 zero,beep pin 1 to ground there is beep vallue 0000ohmpositive cause a feed back,inject 3V 1.5Amp found C310 very hot lift the caps short gone . test plug in power amd switch on U19 pin 1output coming for 3.1V .plug in led problem solved.
13.Dell N 5010 Berry DG15 no display current usage 1.2amp ,usually this current consumption have been post except some thingwrong withrandom aces memory or Graphic chip.Starting checking +3.3V_RUN_VGA presented~+1.8V_RUN_VGA presented~+3.3V_RUN_VGApresented~+1.0V_RUN_VGA but Missing +1.5V_RUN, check switching N channel U4203 Source(input) pin available on pin 5,6,7,8 for 1,5VSUS and gate signal (switching trigger) pin 4 available for+1.5V_RUN_ENABLE .checking N channel Drain (output) got 0V beforeexecuted N channel damage checking if there is a feedback there,testing by buzzer (continuity)to the ground than ifound a feedback .it'smean there is one or more shortage component on this line..Using PSU set 1,5V than inject maximal allowed value on this linefound warmcapacitor on C4208 ,pull them out and testing out side by buzzer 2 of pin with 0000ohm .replacewith new one and testing again +1.5V_RUNpresent without changing Switching n channel U4203.Problem solve .Note : Check any Voltage and signal missing before doing BGA reballing process .
14.Toshiba L645 TE 2 Missing LCDVCC,PQ 40 source 15V missing cause resistance EMI on R328 ,reset resistor by inject 3V to pin 2R328resistance reset 15V present .Case close
14.Red display on Toshiba C 640 ,check all LCD cable continuity all good.Checking all power for LVDS power all ok ,resoldering LVDS socket case close.
15.Acer AOD 270 Quanta ZE 7 switch on Led ligh on ,current usage 0.25amp ,no post ,no fan spining Check +3VPCU and +VPCU on PL3and PL 4 both are present ,ceck S5_ON 3.3V present,+5V present on PQ12 ,+5V on PQ22 pin 1 zero ,check PQ22 source pin 3 presen for +3VPCU but no gate (MAIND) pin 2 not present ,this gate triger sould have 3V to pass source voltage into drain for +3V .so many usage onthis missing voltage including +3.3V_PRIME_ON and stop +3VSUS coming.
16.Toshiba C640 Manus 10Totally death motherboard .ADP +19V couldn't reach ADP fetand SMPS VIN Sources to generate 3V and5VALW.Opening schema by identified Jack power location code CN 600 page 6 and check adp+ voltage on jack 19V present ,trace D600519V ok check Q6002 sources pin 5,6,7,8 present for 19V no gate trigger present ,of course drain will not comes out .tray to inject 19V promPSU 19V onQ6002 but no drain output .lift this N channel mosfet and replace with nwe one but drain wont comes out event having 19V gatedriver injected.direct inject to Q6002 drain noshorted indication. Some fitureof this charger IC blocking ADP+ through Curren sensor inputpositive (CSSP) by pussing analog ground to stop ADP+ entering the circuit doe over voltage protection .Checking Adapter current input(ACIN) on pin 19 Max 17435available for 1.7V this is normal according Max 17435 datasheet .Checking Charger IC power good (ACOK3.3V) not present ,LDO also zero volt and get 0ohm on that line,injeck 5V there Max 17435 become hot.lift max 17435 short gone ,replaceMax 17435 .plug inadapter to check Q6002 drain saw led ligh already on ,it mean ALL VALW and 3V_5VALW already present .switch onToshiba logo appear.
17.Toshiba L745 Quanta TE 5 no Source pin 19Vto the system and stop at R1.ISL 88731 detected adapter current in (ACIN) higher thanvoltage allowed than stop the current by pushing analogground trough current sensor input positive (CSIP) due over voltage protection.Drain the power and replace 2 pieces open resistor on ACIN line problem solved.
18.Asus K42 SV Board code K42JR no post ,Following no post prosedure VCCorepresent 1.1VS ,checking Memory Power 1.5VS presentbut no VTT present ,Checking PU 9103 UP7711U8 ddr voltage regulator Voltage control(VCNTL) present for 5VS ,Vin present for 1.5V butno VOUT on pin 4 .testing connecting to the ground 0ohm ,lift the IC short gone ,replace with new one measuring VOUT 0.75VTT coming .
19.Compaq CQ41 CompalLA 4107 No display current usage 0.7amp to 0.9amp not stable ,missing PLTRST output D5 HM 55 ,measuringpoint on U2 ,reprograme Main bios firmware PLTRST present .Case closed.
20.Toshiba L645D Quanta TE3 external monitor display ,internal no display look like a Dim display problem but flashlight no sign of life.check LVDS connector CN3 ,LCD_BK_PWR 19V present ,DISPON 3VS present ,other +3V present ,no LCDVCC and LCD_VADJ ,nooutput from E9 and F7 pin on ATi 216-0752001 ,it may cause BGA oxidized .lift the chip and testing ground continuity on both pad no shortedon that pad .Reball the chip still no result but current usage increasefrom 1.2amp to 1,4amp .check LCD_VADJ has 1.8V there but still no LCDVCC.Replace Ati 216-0752001 problem solved .
21.Dell inspiron N4050 model DV14 HR MB dual graphic having problem with AMD/ATI 216-0809024 ,after lifted the chip there are someactive pad missing .it is useless to reball or replace a chip .Thinking of keep removing AMD 216-0809024 chip trying to editing Main bios todeactivated AMD chip and using HM67 only using Hex editor .aswe know intel HM 67 hasa fiturefor dedicate intel graphic HD 3000 on thisSouth bridge andit work but intel driver wont detect on windows .While trying to have some more information about using HEX ,i found theother series of Dell 4050 using single chip intel HM 67 chip .backup original main bios of DV4HR version 01M and compare the file and foundsome difference on Address 004000 to 004D40 .just incase this happen again on the other series. Well it work fine after QC test for last4hours.
22.Toshiba C640 CT10 no power missing +V3LA and +V5A ,checking Tps 51125 page 8 inventec calcutta 10 mb,no ground feedback onL6200 and L6201 ,checking TPS 51125 SMPS IC regulator input Vin (pin 16) presented 19V,checking output LDO Vreg3 (pin8) presented3.3V,checking VREG5 (pin 17) presented +V5LA ...checking Enable input Entrip1 (pin 1) and Entrip2 (pin6) not present..tracking +V5LA toLogic Gate IC U6100 voltage source Pin 3(VCC) presented 5V,pin 5(MR) presented 5V but output reset pin 1 not present .checking groundfeedback on pin 1 no ground feedback,checking gate VSEN pin 4 not present .this Vsentshould be present 3.3V as a triger gate to makeoutput reset pin 1 present to powering +5AUXON source...check Vsen (pin 4) sources from +VBAT 19V adapter usage resistive byR6104and R6103 it should present 3,3V but 0V present ,checking R6104 it should 510k but found immeasurable,checking R6103 alsoimmeasurable,changing both Resistor got 3.3V on VSEN pin,checking pin 1 (reset) present for 5V ,checking +V5AUXON also present for 5Vback to SMPS IC D6201 input +V5AUXON present for 5V on pin 3,checking pin1 and 2 present for 1.2V..it mean Entrip1 and Entrip2already present.checking SMPS inductor L6200 and L6201 +V3LA and +V5A present .Problem Solved.
23.Acer V5-471 Husk Petra rev2 power switching problem ,current usage 0.013amp CheckingSMPS inductors PL 4101 and PL 4102 3D3Vand 5V presented ,checking RSMRST 3.3V presented,checking KBC_PWRBTN on PWRCN1 (Voltage switch button) present for 3.3V.shorted VSB direct to the ground no response,trace to NPCE 885P pin 93,shorted to ground current response from 0.013 to 0.9ampand power on and display .check R2757 KBC_PWRBTN# to KBC_PWRBTN#R resistance470K was ok ,no more tracking point on schema,it may some conductor broken ,jumper from R2757 pin2 direct to PWRCN1(pin3) problem solved.
Asus A450 no display problem
No comments:
Post a Comment
Note: only a member of this blog may post a comment.