I want to share a number of the mainboard restore experiences that I’ve encountered, perhaps every most important has a unique illness, however this can be a illness I’ve encountered and have efficiently fastened.
*Some fundamental ailments of the mainboard want to share with you, if there’s something, please train me.
Essential Asrock 333 D667 triggering the hexa code doesn’t leap, inflicting the CPU socket to open, re-steaming the CPU socket, the primary runs usually.
The primary Asus P5GC-MX is typically reset, proper on the dos, or win … and many others display screen, inflicting the CPU socket to open, re-steaming the socket, the primary runs usually.
Essential MSI 945PL couldn’t be powered on, shorted on 2 quartz pins to activate dc energy however the primary didn’t boot, reheated the male most important chip besides usually.
Essential Foxcon G31 energy on most important working however not boot ktra see FET provide 1.2 V for chip north and APG burned. The trigger is the error ic oscillation isl 6321 proceed to exchange the pair of FETs and the primary boot isl 6321 chip usually.
Essential Giga G31M cannot be powered on, cannot set off the primary circuit, take away the primary VRM energy provide to energy dc! measure ktra, then 1 FET 12V lifeless, proceed to exchange one other Fet with regular boot most important.
Essential Giga 8i865GME-775 energy on the check card says CO code C1 D3 41 50 FF the display screen does not flip up, plug in VGA card, the code stops 50 screens now scan imger bios ….. re-upload bios most important working boot usually.
Essential Asus P5AD2-E energy on the fan rotates 1 2 turns after which turns off, unplugs the 12V battery to activate the fan rotation ktra foot en = 1.2v pgood = 0.5v error ic oscillator ADP3180 – change one other ic to regular boot.
Essential Asrock P4i45GV check card says Advert, the northern chip filter capacitor is swollen, substitute the primary boot filter capacitor usually.
Essential Prescott 533 misplaced CPU energy, as a result of Pgood = 0V proceeded to exchange FET 3055 on the high of the ram slot, the primary boot usually.
Essential intel 915GLVG flashed energy, lifted the primary ADP3188 ic to energy it, tried one other ADP 3188 and plugged in a faux CPU with energy, plugged in an actual CPU and misplaced energy. — trigger ADP3188 error, substitute one other ADP 3188 with regular CPU most important boot supply.
Essential intel 478 standing is when the facility is on, generally it does not, when leaping the hexa code, the facility is misplaced. The trigger is open cpu socket as a result of the primary intel desires to activate the dc supply, then the CPU should be plugged in after steaming the primary boot socket usually.
Essential Giga 945GZM-S2 bios code 45 proceed to improve bios most important boot usually.
Essential Foxcom 45CMX misplaced CPU energy as a consequence of lack of energy Ram 1.8V substitute ic oscilloscope ram IC 7120 (equal to RT 8150) ram has 1.8v supply -. have regular boot CPU most important supply.
Essential intel 845gvrs powered fan wobbled 12v pin pin, fan rotates usually -. most important quick vcore -. quick the fet, take away the quick fet and substitute it with a brand new one, the situation remains to be the identical! attempt as an alternative of section invert ic and most important fet pair with regular boot vcore !
Essential giga 945gcm-s2 misplaced reset and clock pulses. Measure north chip supply = 0.6v. at pin D of fet Q287 = 0.6v powering fet Q287 is fet Q289 measured at pin D = 1.8 G = 10.3v foot S = 0.6v open situation fet sufficient -. fet doesn’t know. Substitute fet Q289 chip supply north = 1.2v most important boot usually
Essential asus P5GZ-MX cardtest reported code 85, usb shutdow error display screen after 15s. After 15s, the primary self shutdow, ktra noticed the lack of 5v energy provide to the usb port. The diode capacitor is damaged, proceed to exchange the capacitor. most important boot usually.
Essential intel energy on cardtest reported bios code E8 E9 EA EB, bios error. Updating bios most important boot bt
Essential giga 945gzm-s2 misplaced vcore, chip north, ram … proceed to exchange OSC 6520 ( ic to handle ram ) most important boot usually
Essential 865G7 cardtest stopped the AF25 code as an alternative of the north chip, nonetheless the identical! North south sufficient cpu ram supply ! supply ram measured = 2.56v . change the primary boot ram supply fet usually
Essential p4i65GV misplaced the reset pulse, test that the ram supply fet is scorching, lose the north chip supply, the D and G pins of the fet have a supply -. change to a different pair of ft. There’s a supply of chip north of most important boot bt, fet ram shouldn’t be scorching
Essential foxcom 45GMX energy on check card says FF not out vga on, out vga go away ! ktra discovered that the diode D20 (close to the 12V vcore battery) was touched, proceed to exchange the diode. Essential boot out vga on .
Essential Giga 945GCM-S2 full energy, misplaced reset pulse. Carried out steaming the male chip had a reset pulse however the primary didn’t boot. Substitute with one other male chip. Essential boot bt
Essential biostart 945GC-M7 TE misplaced reset pulse (with cpu supply) ic error Lan take away ic Lan to most important boot bt
Essential asus p5kpl-am misplaced reset pulse, measured impedance of chip north 12 ohms, chip on different most important 24 ohms, proceed to exchange chip north most important boot bt
Essential dell 865 synchronously plugs within the cardtest code to leap usually, the caplock keyboard doesn’t exit to the exterior display screen, ktra discovered that pin 13 of the vga port has no energy, measured impedance 47 ohms, discovered that this pin eats instantly into the north chip, proceed to exchange the chip with one other most important, the exterior monitor is out.
Essential Intel D845GVFN
Phenomenon: When the facility is turned on, there’s a Reset sign, however the code C0 reveals up after which stops, there’s a quick beep like a RAM error, when the RAM is put within the beep, however the hexadecimal quantity on the check card doesn’t leap, it’s nonetheless used at C0.
Trigger and Different: Evaluation:
There’s a beep sound indicating that the CPU is working and the BIOS has been loaded. however the Hecxa quantity doesn’t leap means the machine doesn’t execute BIOS to check the units, => BIOS error.
Obtain BIOS on-line however no, solely Replace.
Use one other Essential of the identical kind, Learn out to get the BIOS after which load the Essential with the above error => Essential labored OK.
Mainboard – Essential Preescos 533 Socket 478
Phenomenon: When the facility is turned on, the facility gentle on the check card flashes at a charge of about 1 second / time, when the facility indicator flashes, there’s a voltage drop, no reset
Trigger and alternative: Attributable to lifeless IC – SIO (Winbond W83627F), changing this IC Essential ran OK.
Mainboard – Essential Foxconn 865M01 Socket 478
Phenomenon: When the facility is activated, the facility gentle on the check card blinks, take away the 4-pin energy plug from the Essential, then the facility will be activated.
Trigger and alternative: The above phenomenon is attributable to a VRM quick circuit, a brief Mosfet lamp and a lifeless section invert IC, the restore course of is as follows:
Measure and test the Mosfet lights on the VRM circuit and see that the highest 3 Mosfet lights are quick (in actual fact, 1 lamp is brief, however as a result of parallel circuit, it ought to see 3 quick lights), take away the three Mosfet lights above to test and see the second gentle. 2, when the lamp is brief, the section invert IC often dies, however the section inverting IC can’t be measured by the impedance scale, so I’m as follows:
Go away the state of eradicating the three Mosfet lights above to go away the legs empty.
Energy and energy the supply to run, measure the voltage on the 3 G pins of the three Mosfet lights on (leaving the legs empty), if their voltages are equal and about 8V are 3 good section inversion ICs, if they’re totally different then sure 1 IC died, when measured, the primary and third lights on the G foot have 8V and the second gentle on the G foot loses voltage => lifeless conclusion IC 2nd section reversal
Substitute the section invert IC and measure the voltage out, then substitute the great Mosfet (taken from the equal place of the opposite Essential) => Essential ran OK.
Mainboard – Mainboard MSI N1996
Phenomenon: Essential sparkles when working, generally not, when not working, it loses Reset
Trigger and alternative: Trigger: damaged CPU Socket pins
Examine:
When the Essential shouldn’t be working and reset is misplaced, test the lack of VCORE energy provide to the CPU, as a result of the Essential is brief when working when it’s not as much as decide that this can be a flickering contact phenomenon, probably the oscillating IC pin or the Socket pin detaching.
Re-solder IC oscilloscope however not, solder Socket and Essential labored OK.
Mainboard – Essential Gigaby SK 478
Symptom: Check with Card Check Essential has Reset however doesn’t leap Hecxa
Causes and replacements: The above phenomenon is attributable to the next causes
Chipset north doesn’t work as a consequence of damaged legs, damaged..
CPU not working as a consequence of Socket pin or mistaken CPU BUS or CPU error
BIOS error or ROM error, ROM pin doesn’t contact
When testing, press firmly on the again of the North Chipset and activate the facility, the Essential runs => Conclusion Essential has a damaged CS leg within the north
Solder the North Chipset and Essential is working OK.
Mainboard – Gigaby SK775 – G31
Symptom: There may be Reset nevertheless it doesn’t run, doesn’t transcode Hecxa
Trigger and alternative: Re-soldering the CPU socket is OK
Restore course of:
The above phenomenon is as a result of following causes:
> North chipset not working
> CPU mistaken bus or damaged
> Socket Socket
> ROM error or BIOS error
Changed one other CPU, loaded BIOS not working, when soldering Socket CPU Essential was working.
Mainboard – ASUS P5GC-MX Essential
Phenomenon: The primary boot nonetheless has Reset, the Hecxa quantity jumps to the D4 code, then stops, receiving RAM.
Trigger and alternative: – Solder the North Chipset and it is OK.
Checking course of:
Initially, when checking, the Hecxa quantity jumped for some time and stopped at D4 with out displaying up, so the next causes had been decided:
* BIOS error
* RAM error
* The Chipset pin is lacking, so when beginning the BIOS, the Video Card can’t be examined.
* CPU error
Attempt changing the great RAM with the proper BUS nevertheless it does not work, changing the great CPU nonetheless does not work, reloaded the BIOS however nonetheless the identical. lastly soldered the North Chipset, the Essential was working OK.
Mainboard – Essential FOXCONN Socket 775
Phenomenon: When the facility is activated, there’s a Reset sign on the Check Card, however the Hecxa quantity doesn’t leap, so the Essential doesn’t begin, no error.
Trigger and alternative: – Essential has reset sign means the voltage stabilizer circuit on Essential has been energetic, Clock circuit has been energetic and Chipset male has additionally labored. The phenomenon of Hecxa numbers not leaping is as a result of the North Chipset has not labored, the CPU has not labored or the BIOS can’t be loaded. After checking the socket of the CPU, it was nonetheless regular, changed the CPU effectively and the proper BUS was nonetheless the identical, I soldered the North Chipset once more, after soldering the North Chipset, Essential ran OK. The temperature when soldering this Essential North Chipset is about 260 levels Celsius in keeping with the clock on a Chinese language Chipset welder.
Mainboard – Essential Pentium 3
Phenomenon: When you do not plug within the keyboard, the system will begin up, if it reveals up for about 30 seconds, then cease, in the event you plug the keyboard in, it will not begin, will not present up.
Trigger and Different: The above phenomenon has 2 ailments:
Sick when plugging the keyboard into the Essential doesn’t begin (good keyboard)
And Essential runs for about 30 seconds, then Cease.
* With the primary drawback, when plugging within the keyboard, the Essential cannot begin, the reason being as a result of the noise filter capacitors are detected proper behind the PS/2 port, I eliminated these capacitors and the Essential plugged within the desk. enter key run OK
* The illness retains working after being proven for about 30 seconds and stops, the reason being that the CPU is overheated, as a result of the thermal paste on the again of the CPU is dry, making a layer of insulation, I cleaned the CPU again and the aluminum piece radiate warmth then apply thermal paste and Essential is working OK.
System: Mainboard – Essential MSI socket 478
Phenomenon: When the facility is activated, there’s a Reset sign, however the Hecxa quantity doesn’t run, doesn’t show, doesn’t report RAM errors.
Trigger and alternative: The variety of Hecxa doesn’t leap is an indication of the CPU not working, however checked the CPU socket effectively, soldered the BIOS pin nevertheless it didn’t work, soldered the North Chipset pin additionally failed, however when taking it, soldering machine to re-solder the 8-pin oscilloscope IC of the 1.2V supply voltage stabilizer circuit (energy provide for Chipset), then see Essential working, however flip it off for some time and switch it again on, if soldering the IC on the Essential once more runs sure, however substitute the brand new IC in the identical phenomenon. ???
Lastly eliminated two ceramic capacitors with toothpicks standing close to the 8-pin IC that Essential was working usually:
KL: Essential is detected by the noise filter capacitor standing close to the 8-pin voltage regulator IC that has produced the above phenomenon.
Mainboard – Essential Intel Socket 478
Symptom: Essential did not energy on.
Causes and replacements: Essential cannot hit the supply as a result of following causes:
Damaged Quartz 32.768KHz
Flawed place Jumper Clear CMOS
Damaged or damaged IC – SIO . pin
Damaged or damaged male Chipset legs
After the above evaluation, I checked in flip and located that the bridge was misplaced within the Jumper Clear CMOS, took a bridge and plugged it into the Regular place => so I used to be capable of activate the supply immediately.
After the facility is activated, the CPU checks to see that Reset is sweet and there’s a Hecxa leap however there is no such thing as a RAM error (despite the fact that no RAM is hooked up) the Hecxa lamp says it’s used at D4, after putting in the RAM remains to be the identical, the D4 error shouldn’t be Not RAM however not Video Card error, this might be a BIOS error, then I eliminated the BIOS ROM and cleaned the legs for good contact, so the Essential was working OK
Conclusion: Essential didn’t contact ROM pins, prospects self-corrected however added a illness that brought about Jumper to be misplaced, resulting in energy failure.
PAN loses V-CORE “FOXCONN G31MV”
(different sources are sufficient from A–>Z) Solely misplaced Vcore supply. I additionally refer to just about 20 subjects PAN illness of this MAIN line… most of them discovered lifeless Q18-Q20 close to SK fan==> steps to test Examine: Changed Q18 and Q20 (checked Q18 with 1v2 ==>OK, Q20=0.8v)
IC oscilloscope 8841: Pin 19=5v, pin 26=12v, pin 32(Vtt)=1v2, Pin PWGOOD 31 lack of voltage 3v3
##PAN 1: Biostar 945GC-M7 TE has sufficient energy, clock, and reset.
Mainboard Biostar 945GC-M7 TE full energy, clock, reset reset.All sources OK. Clock is sweet (Clock gentle on Check Card and CLCK measurement on faux load CPU), Reset gentle doesn’t interrupt.
It took quite a lot of time, as a result of subjectively pondering that having a Clock, there should be a PGOOD in regards to the Nam chip. After beating every part, I simply occurred to note this Essential eliminated the CPU (there can be no Vcore) however the Clock gentle on the check Card remains to be on > this man Clockgen circuit doesn’t depend upon PGOOD.
Examine the circuit round IC L6703 Vcore supply oscillation, SS_END / PGOOD sign (pin 46) is reversed section 2 occasions by way of 2 tiny lights Q83, Q82 (close to the highest on the RAM slot) after which again to the South chip (pin 46 L6703) > Q83 > Q82 > male chip).
Set up the CPU, on the supply to measure the voltage once more, see that battery 46 L6703 has voltage (about 3V), this voltage is put by way of 1 again into the B pin Q83. The Q83 pin C voltage 0V > OK, the B pin Q82 voltage can also be 0V > OK, however its C leg has no voltage (ought to have a excessive stage), inferring the Q82 CE rust detector.
Take away Q82 after which click on once more >>> OK, the code jumps easily, listens to an expensive beep (this beep is certain to be cherished by everybody who fixes the primary)!!!
(Plainly many generations of Biostar Clock nonetheless run with out PGOOD, please test for me).
Mainboard – Essential BIOSTAR 945GZ
Phenomenon: Essential runs for about 1 minute, then Cease, for a second when the facility is activated, it runs for about 1 minute, then Cease.
Trigger and alternative: Trigger: Because of the error of the oscillator IC of the VRM circuit, substitute the oscillator IC of the VRM circuit with the image ISL6322, the Essential has run stably.
Clarify:
When analyzing the illness, with the Essential illness working, it implies that the parts on the Essential have been working, however after working for about 1 minute, then Cease, this can be a signal of a sure element on the Essential being overheated, from the above assertion. I’ve checked the temperature of the parts on the Essential comparable to: Chipset south, chipset north, IC-SIO, BIOS, Clock Gen, all are regular, after I test the Mosfet lights of the VRM circuit (there are 6 lights divided into 3). pair) noticed that two lights of 1 pair (briefly known as pair no 1) had been highly regarded (lengthy contact will burn arms) the opposite two pairs had been solely barely heat, I modified the place of pair no 1 (heated) to place no 1. The opposite pair place (simply barely heat) reveals that the place of the No. 1 pair remains to be scorching, ie not due to Mosfet, then measure and test the oscillating voltage (measured on S and G), then see the voltage of the lamp on the higher aspect of the pair. being scorching has an oscillating voltage of about 6V AC whereas the voltage of the lamp is on the identical aspect however not scorching solely 4V AC => Conclusion defective oscilloscope IC gave a disproportionate oscillation, resulting in a phenomenon of 1 pair of labor The capability is overloaded and overheated…, after changing the primary oscillator IC, it runs usually.
Essential Gigabyte G41M-ES2L. Phenomenon: The machine turns off by itself, turns itself again on utilizing the tweezers on the foot of the Pon foot (Doesn’t rely the win error, as a result of {hardware} restore should exclude these circumstances first. Sure. Substitute the small diodes, resistors, capacitors linked to the supply jack -> no. Proceed to exchange the IO chip (can substitute hxs with gxs ) -> no. Lastly proceed to steam the male chip once more, or substitute it. the male chip should work okay.
The mainboard was struck by lightning alongside the modem line, touching the LAN IC was highly regarded -> The machine couldn’t be powered, the facility on pin didn’t have 5V. Proceed to take away the community IC, the machine boots usually. You need to connect a separate community card to make use of, as an alternative of different LAN ICs, it will not come up as a result of the set fires the resistors, capacitors, diodes… As well as, there are some circumstances the place the set can nonetheless enter DOS nevertheless it crashes into home windows.
Essential Gigabyte GA-945PLM-S2, misplaced reset sign, misplaced CPU voltage and RAM, changed the RAM oscillator IC close to the male chip, it ran okay. There are some matching circumstances that additionally trigger CPU stress loss. Simply substitute the equal capacitor to run.
Pc mainboard restore
These are the ailments I’ve corrected, please check out it. Not all ailments are fastened as above as a result of every most important has totally different ailments. And these mainboards are additionally outdated now, newcomers to the career discuss with fixing these ailments first to enhance their expertise.
