80 Professional Questions with Complete Answers
Target: Student ko BIOS IC, SPI Communication, BIOS Programming aur BIOS Troubleshooting ki complete understanding dena.
Basic Knowledge
Q1. BIOS IC ka Reference Designator kya hota hai?
Answer:
U
Example:
- U49
- U3501
- PU8
Kuch motherboards mein:
- BIOS1
- UEFI
- SPI_ROM
Q2. BIOS ki Full Form kya hoti hai?
Answer:
Basic Input Output System
Q3. BIOS IC ka main kaam kya hota hai?
Answer:
Laptop ka sab se pehla firmware store karna aur hardware ko initialize karna.
Q4. BIOS IC kis type ki memory hoti hai?
Answer:
SPI Flash Memory
Q5. Laptop ON hone ke baad sab se pehle kaunsa IC active hota hai?
Answer:
Power Sequence complete hone ke baad KBC aur PCH BIOS ko read karte hain.
Q6. BIOS IC motherboard mein kahan hoti hai?
Answer:
Normally PCH ya KBC ke qareeb.
Q7. BIOS IC kitni pins ki hoti hai?
Answer:
Aksar
8 Pins (SOIC-8 / WSON-8)
Q8. BIOS IC ki Supply Voltage kitni hoti hai?
Answer:
- 3.3V
- 1.8V
Model par depend karta hai.
Q9. BIOS IC ki common companies kaun si hain?
Answer:
- Winbond
- MXIC (Macronix)
- Gigadevice
- EON
- SST
- Micron
Q10. BIOS IC ka package kaunsa hota hai?
Answer:
- SOIC-8
- WSON-8
SPI Communication
Q11. SPI ki Full Form kya hai?
Answer:
Serial Peripheral Interface
Q12. SPI mein kitni wires hoti hain?
Answer:
4 Main Signals
- CS#
- CLK
- MOSI (DI)
- MISO (DO)
Q13. BIOS IC ka Pin-1 kya hota hai?
Answer:
CS# (Chip Select)
Q14. Pin-2 kya hota hai?
Answer:
DO (MISO)
Q15. Pin-3 kya hota hai?
Answer:
WP# (Write Protect)
Q16. Pin-4 kya hota hai?
Answer:
Ground (GND)
Q17. Pin-5 kya hota hai?
Answer:
DI (MOSI)
Q18. Pin-6 kya hota hai?
Answer:
CLK (Clock)
Q19. Pin-7 kya hota hai?
Answer:
HOLD#
Q20. Pin-8 kya hota hai?
Answer:
VCC (3.3V ya 1.8V)
Voltage Questions
Q21. BIOS VCC kis pin par hoti hai?
Answer:
Pin-8
Q22. Ground kis pin par hoti hai?
Answer:
Pin-4
Q23. BIOS par 3.3V na ho to kya hoga?
Answer:
BIOS read nahi hogi.
Laptop POST nahi karega.
Q24. BIOS IC garam ho rahi hai.
Answer:
Internal short ya VCC short ho sakta hai.
Q25. BIOS IC short ho jaye to symptoms?
Answer:
- Dead Board
- No Current
- No Boot
Programming
Q26. BIOS Programming kya hoti hai?
Answer:
BIOS firmware ko erase aur dobara write karna.
Q27. BIOS Programmer kya hota hai?
Answer:
SPI Flash ko read/write karne wala device.
Q28. Common BIOS Programmers kaun se hain?
Answer:
- CH341A
- RT809H
- EZP
- SVOD
- Vertyanov
Q29. CH341A kis liye use hota hai?
Answer:
BIOS Read, Write aur Erase ke liye.
Q30. 1.8V BIOS ko direct 3.3V programmer se program kar sakte hain?
Answer:
Nahi.
1.8V Adapter zaroori hai.
BIOS File
Q31. BIOS Dump kya hota hai?
Answer:
BIOS IC ka complete firmware data.
Q32. BIOS Backup kyun lena chahiye?
Answer:
Original firmware ko save karne ke liye.
Q33. Corrupt BIOS kya hoti hai?
Answer:
Jab firmware damage ya incomplete ho.
Q34. Wrong BIOS flash karne se kya hoga?
Answer:
Laptop boot nahi karega ya naye faults aa sakte hain.
Q35. BIOS verify karna kyun zaroori hai?
Answer:
Programming successful hui ya nahi.
Practical Questions
Q36. Laptop ON hota hai lekin display nahi.
Answer:
BIOS corruption possible hai.
Lekin RAM, Display aur Power Sequence bhi check karni hogi.
Q37. Caps Lock blink kar raha hai.
Answer:
Kuch models mein BIOS fault indicate karta hai (manufacturer-specific).
Q38. Fan chal raha hai, display nahi.
Answer:
BIOS, RAM, CPU ya PCH issue ho sakta hai.
Q39. BIOS IC par 3.3V hai lekin boot nahi.
Answer:
Clock aur SPI Communication check karo.
Q40. BIOS read nahi ho rahi.
Answer:
- VCC check karo.
- WP# aur HOLD# lines check karo.
- Programmer settings verify karo.
- IC faulty bhi ho sakti hai.
Advanced Questions
Q41. BIOS aur EC BIOS mein kya difference hai?
Answer:
Main BIOS CPU/PCH firmware hoti hai.
EC BIOS KBC firmware hoti hai.
Q42. Dual BIOS kya hoti hai?
Answer:
Do BIOS ICs wali motherboard.
Q43. Intel ME Region kya hota hai?
Answer:
Intel Management Engine firmware ka hissa.
Q44. Service Tag kis mein store hota hai?
Answer:
Dell laptops mein BIOS/NVRAM region mein.
Q45. NVRAM kya hota hai?
Answer:
Configuration aur system settings store karta hai.
Q46. BIOS Password kahan store hota hai?
Answer:
Model par depend karta hai. Kai systems mein NVRAM ya Security Chip mein.
Q47. BIOS Update aur BIOS Programming mein kya difference hai?
Answer:
BIOS Update OS ke through hoti hai.
Programming direct IC par hoti hai.
Q48. Kya BIOS update fail ho sakti hai?
Answer:
Haan.
Power loss ya wrong file ki wajah se.
Q49. Kya BIOS IC replace ki ja sakti hai?
Answer:
Haan.
Agar compatible part ho.
Q50. Replacement ke baad kya zaroori hai?
Answer:
Sahi firmware program karna.
Shop Level Questions
Q51. Boardview mein BIOS kaise search karte ho?
Answer:
U
Ya
BIOS
Ya
SPI
Q52. Schematic mein BIOS kis bus se connected hoti hai?
Answer:
SPI Bus
Q53. BIOS CLK signal kis pin par hota hai?
Answer:
Pin-6
Q54. CS# ka kya kaam hai?
Answer:
BIOS IC ko select karna.
Q55. HOLD# ka kya kaam hai?
Answer:
SPI communication ko temporary hold karna.
Q56. WP# ka kya kaam hai?
Answer:
Write Protection.
Q57. BIOS IC remove karne se pehle kya check karna chahiye?
Answer:
- VCC
- GND
- SPI Signals
- Schematic
Q58. Hot Air se BIOS remove karte waqt temperature kitna rakhna chahiye?
Answer:
Aam tor par 320–380°C (board, solder aur nozzle ke hisaab se adjust kiya jata hai).
Q59. BIOS pad uth jaye to?
Answer:
PCB repair aur jumper wiring ki zarurat pad sakti hai.
Q60. Professional Technician BIOS kab suspect karta hai?
Answer:
Jab:
- Standby voltages theek hon.
- Power sequence normal ho.
- Clock aur Reset signals available hon.
- Lekin system POST na kare.
Interview Questions
Q61. BIOS ko bina backup ke flash karna chahiye?
Answer:
Nahi.
Hamesha backup lo.
Q62. BIOS read ho rahi hai lekin write nahi ho rahi.
Answer:
WP# line, programmer settings ya IC fault check karo.
Q63. Laptop auto restart kar raha hai.
Answer:
BIOS corruption ek possibility hai, lekin thermal, RAM aur power issues bhi investigate karne chahiye.
Q64. BIOS file ka size kyun important hota hai?
Answer:
IC capacity se match hona chahiye.
Example:
8MB IC → 8MB BIOS File.
Q65. 16MB BIOS ko 8MB IC mein likh sakte hain?
Answer:
Nahi.
Q66. BIOS flash ke baad bhi display nahi.
Answer:
RAM, CPU, PCH, Display aur Power Sequence bhi check karo.
Q67. BIOS detect hi nahi ho rahi.
Answer:
- Supply missing
- Wrong orientation
- Faulty IC
- Broken SPI lines
Q68. Professional Golden Rule
Question:
BIOS troubleshooting ka sab se important rule kya hai?
Answer:
"BIOS ko tab tak blame mat karo jab tak uski supply, clock aur SPI communication verify na kar lo."
Q69. Practical Interview
Question:
Pin-8 par 3.3V nahi hai. Sab se pehle kya check karoge?
Answer:
3.3V ALW rail, LDO regulator, fuse aur supply path.
Q70. Practical Interview
Question:
Pin-8 par 3.3V hai, Pin-4 Ground hai, lekin CLK signal nahi.
Answer:
PCH/KBC, Clock generation aur SPI initialization check karunga.
Q71. BIOS IC ka notch ya dot kis liye hota hai?
Answer:
Pin-1 identify karne ke liye.
Q72. IC ulta solder ho jaye to kya hoga?
Answer:
Board boot nahi karega aur IC damage bhi ho sakti hai.
Q73. BIOS programming ke baad Verify fail aa jaye to?
Answer:
Programmer connection, IC aur file ko dobara verify karo.
Q74. BIOS programming ke baad CMOS reset kyun kiya jata hai?
Answer:
Purani configuration clear karne ke liye.
Q75. Kya BIOS corruption hamesha software se hoti hai?
Answer:
Nahi.
Power failure, faulty flash memory ya hardware faults bhi wajah ban sakte hain.
Q76. BIOS IC ki capacity kaise pata chalti hai?
Answer:
Part number aur datasheet se.
Q77. Winbond 25Q series kis type ki IC hoti hai?
Answer:
SPI Flash BIOS Memory.
Q78. Professional technician ka pehla rule BIOS programming mein kya hai?
Answer:
Original dump ka backup lo.
Q79. BIOS flash ke baad laptop ON hua lekin keyboard kaam nahi kar raha.
Answer:
EC firmware ya model mismatch bhi check karna hoga.
Q80. Shop Final Practical Question
Question:
Dell motherboard dead hai. 3.3V ALW, 5V ALW, RTC, Clock aur Reset sab theek hain. BIOS IC par 3.3V bhi aa rahi hai, lekin POST nahi ho raha. Tumhara troubleshooting sequence likho.
Answer:
- BIOS IC ki supply aur ground verify karunga.
- SPI pins (CS#, CLK, DI, DO) par activity check karunga.
- BIOS ka original backup read karunga.
- Firmware ko verify aur compare karunga.
- Agar corruption ka doubt ho to clean aur correct BIOS flash karunga.
- Zarurat par Intel ME/EC firmware compatibility verify karunga.
- BIOS ke baad bhi fault ho to RAM initialization, CPU, PCH aur power sequence ko aage investigate karunga.
📘 Chapter 11 (Next)
Agla chapter hoga KBC / EC (Keyboard Controller / Embedded Controller), jisme hum 100+ professional questions cover karenge, kyunki motherboard repair mein BIOS ke baad sab se important IC KBC hoti hai. Is chapter mein Power Button se lekar SLP signals, RSMRST#, EC_ON, lid switch, fan control aur charging logic tak sab kuch detail mein cover hoga.
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