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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-06-2025, 12:13 PM
thank you sir feels nice when some repair is done and successfull ) true this is 2008 model i guess . very old . sure this website is so good, lots of great experts here like you . i would sure appreciate at any chance i get .
i have come here before too for repairing my crappy power suply , its a very bad local power supply, everyone said to throw it away , just to keep it for learning purposes, but it failed anyway and i got tired of it ^^ hope one day i will make use of its parts or something lol...

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-06-2025, 01:46 AM
mon2[USER="295753"]mon2[/USER] the laptop works as it should . thank you so much for teaching me and reading schematics i really hope it stays that way , i dint replace the capacitor tho .. but why did this happen in first place .. please kindly convey your thoughts on the cause

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 01:26 PM
ah yes then there is no voltage at all at those cpu inductors colils(both sides nothnig) or capacitors at one side , yes its a true dell laptop charger which came with laptop , i never changed it . i think my multimeter is showing extra +3voltages may be.
i tested some 1.2 v battery , it reads it as 1.4v , i tested some 18650 batteries from this old laptop battery dissaembled which i use for bluetooth now :P , they usually use to measure just 3.5 to 3.7 , now they all showing 4.9- 5v , multimeter is crapped but i get what it really wants to say i guess ^^ , but yes i should get a good quality...

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Last edited by playit; 03-04-2025, 01:42 PM.
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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 12:23 PM
now i put the charger and powered the charger plugged into laptop , the light stays in charger , the power led in laptop motherboard comes once then gone (normal for my laptop) , pq3 at one side ,all 4 pins getting 24v and other side maybe 0.1 or nothing . checked at pq 17 19 21 , same 24v at one side , other side nothing . cpu coils inductors pl 12 13 14 shows nothing -- i dint switch on laptop , i dono how to do it unless i figure that power strip on button . the capacitors at cpu coils show 24v at one end , other sides nothing.
now dono how to create load in logic board . i checked pl3...

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Last edited by playit; 03-04-2025, 12:29 PM.
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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 10:23 AM
shall i try starting the laptop without putting ram and cpu ,i have no battery anyways . shall i put the charger and and see if charger light still on ? then next will try to assemble everything and see if display comes ?
then try one ram then put cpu at last and try ?
or test voltages step by step with your guidance ^^

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 08:27 AM
here from this day - no short in clr resistance or in that pc109 capacitor place, i dint replace it, its empty now....

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 08:24 AM
this place dont have that 9v battery , so taking time to replace that battery , but the short is removed after i took off this pc109 , the ohms are in 650s ohms, reverse shows some 1400s then disaapear . (that 200 meter is crap , so i took it in 2000ohms meter)

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 05:27 AM
hi , 19.5v charger of this dell laptop giving 24-25 v in multimeter 200v meter at dc voltage ,is this ok ? , this is without any load . could this be the reason for shorting out 25v 10uf decouplling capacitor in chrg_in 19v rail ? i asked this to another person who teaching too , he said It's either because the multimeter is crap or battery almost drained , as my multimeter does show battery low sign in screen. btw whats the reason for this pc109 to go shorted in chrg_in line ,other 3 capacitors along with it is pc 6 ,7 , 11 . 2x50v and 2x25v capacitors , one 25v capacitors at the end (pc 11...

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-02-2025, 11:43 AM
so if i understood about the test ,see if i have done this right -- i probe pq3 1 2 3 with all those pq 17,19,21 pins 5 6 7 8 (they were at back of board at place of cpu inductor coils) -they were o ohms ( i mean the expected resistance in my multimeter) .
then i kept pq3 1 2 3 pins to pq 17,19,21" 1 2 3 pins -- red (volt) probe from pq3 123 pins to pq 17 19 21 123 pins - gives nothing --only once i saw some 1k ohms then disappear . if reversed black (ground) probe from pq3 123 pins to pq 17 19 21 pins - gives 670s ohms ..

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-02-2025, 09:08 AM
about the pq3 readings , please see the pic sir.

1 Photo

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-02-2025, 08:13 AM
hello sir, congrats on macbook repair &dry wall work
the pq5 (your posted schematic ) is from discrete dell 1420 scehmatic which is not a match with the board we working on now , the dell 1420 uma matches good with the board i have , with all the capacitors , coils ,chips as pu1 , 2 names etc matches great with the board i have. i attached it again just incase for more reference for you .
the pq5 in your posted schematic(discrete 1420) is connected to resistor pr131 then to the ground , but in mine it does not match ,only pq3 is matching connected to resistor pr112 (at back...

3 Photos

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-28-2025, 01:27 AM
yes in resistance ohms meter 2000, i have to keep it manual scale ,rotate the wheel. - i get this readings when placed red (volt)probe on pl12,13,14 and black(ground) probe on pq4 , pq5 ....

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-27-2025, 05:02 PM
yes i have this pq5 in my board at back side of battery port , vcore rail means those pl12 13 14 ?
pu1 is MAX8731AETI t1817 +titij
in resistance mode - one probe to inductor , other probe on pins of pq5 --- on top of pq5 name pins - all 600s , below pins in 200s and one 700s .
i guess according to your pq5 in the pic , in mine its pq4 - so measured it too from pq4 pins to pl12 inductor -- 663 at one side and other sides are in 200s . one was giving ground low resistance i guess.
the board is really much similar to this uma schematic , i can find all the parts good and clear...

1 Photo

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Last edited by playit; 02-27-2025, 05:05 PM.
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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-27-2025, 03:35 PM
mon2[USER="295753"]mon2[/USER] sir , at pc2 and pc3 , its empty , there is nothing , just 2...

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 10:08 PM
i am in doubt , dono whats charg_in , please do tell me whats it exactly if the above dint suffice the test , is charg_in is battery port ?

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playit replied to diy - voltage injection possiblity with voltage and ampere regulator - possiblity ?

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 09:12 PM
oops dint notice the image wasnt uploaded

1 Photo

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 07:43 PM
the pc2 and pc3 was at back of battery port otherside , pc2 and pc3 connected to chrgin , so i tried to measure from there to inductors - there was no resistance in resistance mode ....

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Last edited by playit; 02-26-2025, 08:02 PM.
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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 05:41 PM
oh sorry to be disturbing you while repairing that bitten apple , hope you will be soon successful to 100% , yes sir the cpu is removed at first , i dint keep anything with it in first place, its only a bare board now .removed cmos too at first. hmm not sure how to measure from main power rail ,will try to figure out , oh mm is that means i should not keep ground ?
i kept ground probe at middle pin of jack dc which is 19 v , then red probe to those 3 inductors all of them showed 900s resistance /in reverse nothing shows up. there is a "220 82hs d" in front of those 3 inductors...

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Last edited by playit; 02-26-2025, 06:39 PM.
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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 04:28 PM
mon2[USER="295753"]mon2[/USER] i checked pl8 (rusted look inductor ) gives 14-15 in resistance mode -this says 1v vccp section might be bad ? it should be in...

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playit replied to laptop 19v short circuit dell vostro 1400 motherboard ,need help in repair .

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 01:47 PM
these schematics are rev 0.1 , my board says its rev- a00 ,its confusing , the numbers many of them dont correlate with the board
[USER="295753"]mon2[/USER] sir , this 1420 elsa uma matches part numbers better than any other schematics above. please kindly watch it . thank you.mon2these schematics...

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Last edited by playit; 02-26-2025, 02:19 PM. Reason: adding that this version matches much closer to my board
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