华硕的显卡维修培训文档

VGA L3--2 Training Materials VGA L3
VGA L3-2Training Materials L3
Repair Knowledge & Skill
Overview
1.Repair Flow Chart …………....P3
2.Repair Knowledge …………..P4~P21 2Repair Knowledge P4~P21
mon problem ………....P22~P29
4.Bad Phenomenon ………….P29P54
Bad Phenomenon………….P29~P54
1. Repair Flow Chart p
Engineer Key in
Visual Inspection
CID?
Yes
Fail
Test before Power on I f C t Touch Up Repair process Pass
Fail No
C
Test before Power on Inform Customer Touch Up
Repair process Pass
Repair process Fail Customer request Repair?
Standard Test?
Repair process Yes
Fail Boot?
Pass
Repair process NTF Test?
Return Process
Repair process Pass
No
Fail F il Pass
Special Test?
Pass
Fail
Repair process
Engineer Key out
2. Repair Knowledge
Important skill
p
Visual Inspection
Clean the golden finger
Cl th ld fi
Flash bios
Check Main voltage
(FVBDD NVVDD A3V35V12V) (FVBDD,NVVDD,A3V3,5V,12V………)
Look for the same card to measure each other
Voltage
Power Flow chart
Power on Sequence
Power on Sequence
Power Maps And Test Point Main Voltage
Power Supply Circuit
Thermal Protection
Thermal Protection
Power Flow Chart
MODEL:EN7300TC512
RT9214PS
AP60T03GH
AP70T03GH
PL5
NVVDD/11A PEX1V2/1.6A
1
2
V
FBVDDQ BA178M05FP H431BN GS358SF
P3055LDG
5V
200mA
2.5VREF
2A
PMBS3904
PLLVDD
2.5V/
3.3V
50mA
3
V
3
PL1
F3V3
3.3V/200mA
Switching Linear Switch
q
Power On Sequence
MODEL:
EN7300TC512
F_3V3
5V
NVVDD
PLLVDD
FBVDDQ
PEX1V2
nVIDIA has no definite request to timing
VIDIA h d fi it t t ti i
Power On Sequence owe O Seque ce
AMD Series
GPU
Memory
(1.1~1.3V)
(152V)1.8V (1.5~2V)
1.1V AMD’s request to timing can conclude to two points:G fi i
3.3V
①GPU power first arise ②1.8V arise earlier than 3.3V
*According to different memory producer GPU and memory will has a According to different memory producer ，GPU and memory will has a different control succession*
Power Maps And Test Point p
PQ1 FBVDDQ
PU4 12V PCE3 PLLVDD
PQ1 3V3
PU4 5V
PCE12 PEX1V2
PL1 F3V3
PL4 NVVDD
MODEL:EN7300TC512
PU4=12V
PQ1=2.6V
（FBVDDQ ）
U2 PIN4、7、8=F3V3
PU4=5V
PQ1=3V3
PQ7=NVVDD_IN
PL4=1.29V （NVVDD ）
MODEL:
PL5=PEX1V2
EN7300TC512
Q502=3.3V
PU1 PIN8=12V
(PLLVDD)
PU1 PIN5=2.5VREF
PU3 PIN5=12V
（NVVDD_VCC）
MODEL:
EN7300TC512
U506 PIN14=5V
L63=1.34V(VDDC)
L66=2.08V(MVDDC)
Ex:EAX700PRO
L65=2.08V(MVDDQ)
1.2V
MREG1
REG2
13
pin 2,4=1.8V
3.3V
pin 3=3.3V
12V input
VDDC
/NVVDD GPU 12V golden figure
/external cable GPU
MVDD
/FBVDDQ
Q
Memory
Switching
12V Output Load Step-down
circuit
256V
+3.3V_BUS
5V VCC +2.56V 5V VCC
UP7706 will use two phases when power is higher when power is higher
3V3GPU 3.3V golden
figure
1.8V GPU
GPU
1.1V
12V golden figure 5V,5V_VESA
(DDC_5V)
IC VCC，connector
Step down
Load
Output
Input
POWER SUPPLY:
Component (1)
Input capacitor I t i d t H-S MOS
POWER SUPPLY: Component (1)M Input capacitor
Input inductor H-S MOS Input inductor
L-S MOS Output
inductor
GPU Mem power
L-S MOS
Output inductor Output
capacitor
GPU power
11V 2phase Output capacitor
1.1V （2 phase ）
Output
5V output
5V
Input
POWER SUPPLY:Component (2)
POWER SUPPLY: POWER SUPPLY: Component (2)Component (2)M GPU
IC
1.8V
3.3V
Mem IC
TMDS IO SUPPLY
----With Backdrive Protection
TMDS IO SUPPLY Model:
EN7300TC512
Thermal Protection
Thermal Protection
Model: EN8500GT
3. Common problem
Simply Repairing
p y p g
Function Block
Clock Error
Clock Error
No Display
BIOS Error
H/W Monitor fail
H/W Monitor fail
Fan fail
Function Block
Function Block
MODEL:EN7300TC512
Clock Error
q y
Measure the clock frequency and wave, if both all right, the crystal work properly.
Otherwise , measure voltage, if it s right, the crystal Otherwise measure voltage if it’s right the crystal vibrates wrong; or else, the GPU can’t provide proper power to the crystal.
h l
No Display
p y
Check golden finger and components nearby Check golden finger and components nearby
Measure crystal
27MHz
Measure input inductor voltage
Ch k BIOS i
Check BIOS version
about 1.3V
BIOS Error
Check GPU
Ch k GPU
Check BIOS voltage
Pin8：3.3V
H/W Monitor Fail
Check input power
Check input power
Check clock, including voltage and frequency
Check voltage
Fan Fail
Check voltage
Check voltage
Upside：GND
Under：+12V Check BIOS
4. Bad Phenomenon
A.Problem Code : No display C0ZK00
Problem Code:No display“C0ZK00”
B.Problem Code: Screen noise “C0FZ0K”
C.Problem/Display Error : Crapped display
under 3D test “C0ZF01”
D Problem/Display Error:Run3D test hung up D.Problem/Display Error :Run 3D test hung up
“C0ZF02”
E.Problem/Display Error : Color Error
“C0ZH00”
F.Function Test: Error Code
Function Test:“Error Code”
A. Problem Code :
p y
No display “C0ZK00”
Instruction
No display:
There is more than one reason caused this phenomenon, for There is more than one reason caused this phenomenon for example, wrong voltage, abnormal frequency, GPU can’t work well, etc. Among these reasons, false BIOS setting, power switch d l f di l h i
and power supply often cause no display. Another reason is output ,g g circuit failure, such as bad SMT inductor causes voltage signal not output normally.
A A.Debug card running well can conclude to wrong display output port.
1)Visual Inspection:if there is burnt mark,lost/shifted component,
Vi l I i h i b k l/hif d
or string scuffing on PCB board.
2)Monitor illumines green light with no display:chiefly GPU NG,
please measure whether the RSET voltage is1V.
3)Monitor illumines yellow light:5V NG,or else HSYNC or
VSYNC is bad,measurement need to be done whether the5V
,
amplifier input voltage is normal.
If OK
4)all5V,HSYNC and VSYNC is OK,consideration should be
taken whether the connector is OK or not.
B B.Debug card runs normally
1)Visual Inspection:if there is burnt mark,lost/shifted component,
or string scuffing on PCB board.
i ffi b d
2)Clean golden figures,generally,dirty golden figures can cause )g g g y y g g
AGP card no display,and PCI-E card no display hanging up at D1.
OK lower
3)Measure whether basic main voltage wave is OK,higher or lower.
4)Flash Bios.If can’t flash OK,more possibility is GPU bad,but
sometimes BIOS IC maybe not good,too.
good too
5)Change BIOS IC.Even if bad BIOS IC has lower rate.
6)If also bad,please try to change GPU.
No display and hang up D1
“D1”
GPU works wrong.Or GPU works well,but data exchange(with CPU) channel--PCIE bus has problem.
p
a)Visual inspection:if coupling capacitors of16pairs nearby golden figure
or shifted SMT inductors on bottom are bad.And if golden figures has
g g
oxidize or obvious flax.
b)Measure whether these voltages is short to GND before power on:3.3V,
GPU voltage,Memory voltage,12V.
lt M lt
c)Power on,check if above voltages are OK,PCIE RST is3.3V,and clock
frequency is27.0MHz
270MHz
d)If all above is OK,please check if the resistance between GND and each
data string of16pairs both on top and bottom is well,also to the resistance of each coupling capacitor of all16pairs(lower shows GPU NG,OL is GPU OPEN).
e)Consider change GPU.
GPU
No display and hung up“2A”
1)Visual Inspection:if there is burnt mark,lost/shifted )p,
component,or string scuffing on PCB board.
2)Power on,and measure whether27MHz crystal vibrates well.
on well If voltage is OK with no wave,please first change crystal,or else,no power is GPU bad.
else bad
3)Flash BIOS.
4)Try to change GPU.
B. Screen Noise: “C0FZ0K”
Introduction
Screen Noise:
Screen noise has many types.If only a very small area displays garbage,most possible reason is resistor or array resistor nearby memory is bad,such as open,cold solder joint,short or wrong resistance.If screen noise with stripe garbage,it is more possible
i f i i h i b i i ibl that memory voltage is wrong,please check voltage path.
5models that bad bits can be detected:
1Single bad
1.bit bad.
2.8bits bad.
3.32bits bad.
3bad
4.Bits of single channel bad.
5.Bits of multiple channels bad.
5bad
Trouble Shooting
g g
Trouble Shooting——Single bit bad
A. Check if the array resistor on the path has solder problem or wrong resistance. Check if the connect between GPU and the memory channel is OK.
B. Measure the resistance between the bad bit and GND, if it B.Measure the resistance between the bad bit and GND,if it closes to OK board, the most possibility is memory bad, change memory; if it higher by 100Ohm, GPU OPEN.
y;g y,
Shooting Trouble Shooting——8bits bad
Bad Bits Three signal points should be measured Trouble Shooting 8 bits bad Bad Bits
Three signal points should be measured A00-A07
FBADQM0 FBADQS0 FBADQSN0A08-A15
FBADQM1 FBADQS1 FBADQSN1 A16-A23
FBADQM2 FBADQS2 FBADQSN2Q Q Q A24-A31
FBADQM3 FBADQS3 FBADQSN3A32A39FBADQM4FBADQS4FBADQSN4A32-A39
FBADQM4 FBADQS4 FBADQSN4A40-A47
FBADQM5 FBADQS5 FBADQSN5A48-A55
FBADQM6 FBADQS6 FBADQSN6A56-A63FBADQM7FBADQS7FBADQSN7A56A63FBADQM7 FBADQS7 FBADQSN7
Method is same to single bit bad after problem is measured out.
Shooting
Trouble Shooting32 bits bad
Trouble Shooting——32bits bad
It is most possible that memory is bad, memory reference voltage
,
VREF needs to be measured, which is 1V transferred from memory power FBVDDQ by two resistors, as well as reference frequency CLK, please contrast OK card, accordant wave forms is considered OK.
If the resistance to GND is measured lower, most possibility is
If the resistance to GND is measured lower most possibility is memory bad; higher by 80Ohm is GPU path wrong, or GPU wrong.
A.Visual Inspection: if there is burnt mark, lost/shifted
p,g g
component, or string scuffing on PCB board.
B.Check the resistance between address string and GND is OK
or not.
or not
C.If GPU NG, please try to change GPU.
D.If GPU OPEN, please remove GPU, and measure whether
PCB OPEN.
A. Check memory work voltage, (can refer to OK card), the
A Check memory work voltage(can refer to OK card)the voltage wave must be smooth.
B. Flash BIOS. Wrong BIOS statistics can cause all points, too.
y
C. Determine all memory bad or GPU bad.
D. In most case, GPU bad is more likely than all memory bad. Try to change GPU.
Try to change GPU
D. Problem/Display Error :
D Problem/Display Error: Crapped Display under 3D test C0ZF01 Crapped Display under3D test“C0ZF01”
Trouble Shooting g
AMD Card
1.Flash BIOS.
2.Run the whole memory test.
3.If failing bits can’t be detected, may try to change GPU first.
3If failing bits can’t be detected ma tr to change GPU first
4.Change GPU.
Nvidia Card
N idi C d
1.Check memory frequency mclk() and GPU frequency nvclk().
2.Lower frequency will has value in blacket directly, for example,
2Lower frequency will has value in blacket directly for example mclk(400)
3.Over clock test command
mods–s; <Enter>
WfMats.Run();WfMats.Status() <Enter>
4.Change right component according to detected failing bit.
4Ch i ht t di t d t t d f ili bit Sometimes failing bit can’t be detected under low frequency, we can try to turn up work clock to reveal it.
k l k l i
D. Problem/Display Error : D.Problem/Display Error: Run 3D test hung up C0ZF02 Run3D test hung up“C0ZF02”
Trouble Shooting g
1.Hang up is likely to occur in running3D test program,picture
pauses.Sometimes,test will go on after pause for several seconds, so please wait a moment to see result.
2.When test can’t go on,and no response to press Number Lock key,it
is“hang up”.This time,instantly power on is in vain,GPU NG and power supply deficiency can cause the phenomenon,as well as weak heat dissipate,if so,please power off,and then test again after card is cooled.
i l d
3.Try to lower memory or engine’s frequency,for example,memory
frequency can be turned down from196MHz to180MHz,also to engine clock set up.If pass,please check whether BIOS or GPU is bad.
bad
4.Generally speaking,hang up is caused by GPU Engine bad,can
change GPU.
h GPU
E. Problem/Display Error : E.Problem/Display Error: Color Error C0ZH00 Color Error“C0ZH00”
Trouble Shooting g
1.Visual Inspection: Check if component nearby connector is OK,
not shifted, and no string scuffing on PCB board.
2.Check R,G,B resistor is 75 Ohm, if higher, please check if
related circuit has string cut, two 150 Ohm resistors are OK. If
g,
lower, problem generally is GPU NG.
3.Measure R,G,B waveform using oscillograph probes, if there 3Measure R G B waveform using oscillograph probes if there is no waveform, GPU can’t send it out, change GPU. If there is proper waveform, maybe the connector or string is NG.
proper waveform maybe the connector or string is NG。