维修经验分享-VGA

Repair experience to share

制造維修部

一，認識顯示卡

CRT Output

CRT Output

TV Output

Composite & S TV Output

Composite & S-Video

LCD Output

TV Input Composite & S

General Features

256-bit Graphic Architecture

20 Million Triangles/sec through T&L

350MHz RAMDAC

AGP 4X / 2X

Supports 32MB SDRAM

S-Video In, SC-Video Out Live VGA BIOS, Live VGA Driver

Software Support Windows ®95 / 98 / 2000 / Me Display Driver Windows ®NT4.0OpenGL TM ICD for Windows ®NT and Linux supported.Bundle with MSI TM 3DTooL, including MSI TM

DVD and MSI TM 3D!Turbo TM 2001Live VGA BIOS,Live VGA Driver So Cool !!TV-Out ( S )

CRT Monitor

TV-Out ( A V )

Video-In ( S )

Jumper for Live VGA BIOS

MS-8833 n VIDIA ®GeForce2 MX-400

GPU

Power-PWM Regulator Video

In/Out DVI D-SUB

(CRT)PCI/AGP Bus

VIVO BIOS

R

B G

DDR /DDRII/DDRIII

DDR/DDRII/DDRIII TMDS

二，Mira DRAM

4Banks*1M*32bits

8M*32

三.1 High and Low Voltage

3 voltages to schmoo and possibly a 4th FBVTT if the Memory is sensitive to termination.

–NVVDD –GPU Core Voltage

–FBVDD –Memory Core Voltage

–FBVDDQ –I/O Voltage

–FBVTT –only if required by the Memory Termination

High voltage causes faster rising and falling signals and may cause

more undershoot and overshoot

Low voltage causes slower rising and falling signals which may

impact timing margins

三.2 DVI Connecter

三.3 Flash BIOS Nvidia

nvflash –b filename

nvflash5 -4 -5 -6 filename.rom –A

*nvflash5 –d 查看bios資料

*BIOS>biosver 查看bios版本(05.41.02.17.15) ATI

flashrom –s 0 filename

flashrom –p 0 filename

*flashrom –cr 0 查看checksum

**debug

-dc000:0000 0150(0000-ffff)

四DEBUG TEST •Nvidia

1.mats

2.mats –e 1(2

3..)

3.mods –s

WfMats.Run();WfMats.Status()

(edit mods.log)

4.編輯一個批處理

.edit filename.bat

.mods mfgtest.js –mfg –nvclk *** -mclk *** -test 1% -matsinfo –loops 2% -skip 60 -time

.pause

.edit mods.log

*filename 10 5 (10-1%測詴10083/10***fail 5-2%loop測詴5次)

•ATI

1.r3memid –nocfg –bit -logext 1 2 3 4..

(edit r3memid.log)

2. 編輯一個批處理

3. 調頻測詴

.setclk 查看頻率

.setclk –eng 25000 -mem 20000 (250MHz 200MHz)

五常用的維修之方式和方法

1: 比較法:當不確定該信號是否正確時可用良品與不良品作訊號比較

2: 指壓法:可判斷BGA CHIP是否空焊

3: 觸摸法:觸摸零件是否異常發燙從而找出相關連的零件4: 電表法1:用三用電表歐姆檔量排阻(電阻) 之阻值若變小則可能有線路或零件短路, 反之則可能為排阻(電阻) 不良或周邊零件影響.

5: 電表法2:用三用電表二極體檔可判斷BGA CHIP訊號點是否不良(電表之+極接BGA之GND,─極接欲量測之點).