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#DELL N5050 DV15 10316-1 DUAL CASE STUDY BY @SCHEMA GURU
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Case study challenge 100/100
Lenovo g50-80 (nm-a362) laptop comes in no display issue. From our afs student.
π chk with dc supply amp goes to 0.200 approx.
π open laptop and chk for impedance, all ok.
π now chk voltages 5v ok but on 3v line it shows only 2.4v and other voltages not generate.
π now chk for 3v line output any leakage Or shoting but not found.
π then chk requirements all ok but @ btst pin it shows only 1.4v and other side 2.4v of capacitor.
π so i change capacitor first now chk voltages and 3.3v complete generate. And other voltages also complete.
π now plug in dc supply amp goes to 0.500 approx and display comes @ pendrive.
π but when I connect screen it's on and auto shutdown in 1 minute without display and amp stuck @ 0.68 and never triggered again.
π when it's stuck @ 0.68 I chk with thermal camera found sb ic heatup.
π directly change sb ic sy8206b and plugged it again. Display comes @ pendrive. Now I connect screen and Alhamdulillah now display comes perfectly on screen.
π Thanks to our schema guru Md. Rafi sir. Sir gave us knowledge from his knowledge, and gave us tricks to repair from that tricks which was invented by him. I complete today 100 case study because of him. Thank you sir thanks a lot.
Love you sir π₯°π₯°π₯°
Lenovo g50-80 (nm-a362) laptop comes in no display issue. From our afs student.
π chk with dc supply amp goes to 0.200 approx.
π open laptop and chk for impedance, all ok.
π now chk voltages 5v ok but on 3v line it shows only 2.4v and other voltages not generate.
π now chk for 3v line output any leakage Or shoting but not found.
π then chk requirements all ok but @ btst pin it shows only 1.4v and other side 2.4v of capacitor.
π so i change capacitor first now chk voltages and 3.3v complete generate. And other voltages also complete.
π now plug in dc supply amp goes to 0.500 approx and display comes @ pendrive.
π but when I connect screen it's on and auto shutdown in 1 minute without display and amp stuck @ 0.68 and never triggered again.
π when it's stuck @ 0.68 I chk with thermal camera found sb ic heatup.
π directly change sb ic sy8206b and plugged it again. Display comes @ pendrive. Now I connect screen and Alhamdulillah now display comes perfectly on screen.
π Thanks to our schema guru Md. Rafi sir. Sir gave us knowledge from his knowledge, and gave us tricks to repair from that tricks which was invented by him. I complete today 100 case study because of him. Thank you sir thanks a lot.
Love you sir π₯°π₯°π₯°
Forwarded from Ifraj
Case study-06
11280-1
Problem-Sometime On Sometime Not
Before Power Button Press Dc reading is 0.060 its Abnormal
Open And Clean Motherboard
1st Check all Coil ImpedanceπOK
All Voltage Ok
After Pressing Power button laptop when Start 5v is Unstable
Start Tracing 5v i Found 5v_S5 is Low ON U6102 Replace check Capacitors All Ok Remove UsbIc (U6102)And Jumper To
Pin No.2 To 7
Now DC Reading is 0.11 π
Laptop On Normally and Display Ok
2nd problem After Fixing Laptop Laptop On But No Display Laptop Chargingπ
Here it is One Extra Usb Daughter Board That including Lid Switch just Replace it Case Done β
Thanks To AFS Solution and Mohammad Rafi Sir for Giving us To Wonderful Knowledgeπ
11280-1
Problem-Sometime On Sometime Not
Before Power Button Press Dc reading is 0.060 its Abnormal
Open And Clean Motherboard
1st Check all Coil ImpedanceπOK
All Voltage Ok
After Pressing Power button laptop when Start 5v is Unstable
Start Tracing 5v i Found 5v_S5 is Low ON U6102 Replace check Capacitors All Ok Remove UsbIc (U6102)And Jumper To
Pin No.2 To 7
Now DC Reading is 0.11 π
Laptop On Normally and Display Ok
2nd problem After Fixing Laptop Laptop On But No Display Laptop Chargingπ
Here it is One Extra Usb Daughter Board That including Lid Switch just Replace it Case Done β
Thanks To AFS Solution and Mohammad Rafi Sir for Giving us To Wonderful Knowledgeπ
Dell Inspiron 3000 series laptop . Part number don't know. Problem is laptop on directly when plugging adapter and power button not working . Remove battery and plugged adapter again laptop on automatically. Remove power button but still it's on automatically . So I thought it's motherboard any parts will be problem . So I started to teardown laptop and when I m trying to teardown it's housing I saw CMOS battery so I remove CMOS battery and put it back in opposite direction for 5 sec and put it in same direction . I plugged adapter and laptop on but no display so I keep pressing power button for some sec and it's forcefully off and it again on and restart for 3 times and display came . Now my laptop on and I started to check by doing shutdown and remove adapter and plugged it back but it's not on after that I pressed power button and it's working as usual . Problem was solved earned some money πΈ. I have repaired lots of laptop after joing afs solutions but I m unable to post case studies . Thanks