Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
The resistors are for setting the output Voltage, it will be the IC.
You need to get at least two adj type 1117 Regulator ICs (U5 , DU4).
Tricky part will be removing and installing the ICs without disturbing the resistors and caps closed by, so I hope you are good at surface mount repair.
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
So are you thinking its the resistors or the regulator?Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
DU4 is an adjustable based on the two resistor network (one between ADJ and the Output pin, Resistor DR6, and another resistor between ADJ pin and GND, DR10).
The output Voltage can be calculated by knowing the values of those two resistors.Last edited by budm; 02-04-2016, 10:40 PM.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Well I can tell you that DL6 has continuity and .66V on either side and my multimeter has no way to test a capacitor, visually it looks fine thats all I can say.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
My working set has the following readings for DU4
Pin1: 0.0v
Pin 2:1.24V
Pin3: 3.3v
Pin 2 is off for you. It doesn't look adjustable. DL6 and DCE11 are on that same 1.24 volt line. Make sure those are ok.Last edited by Nick's Tvs; 02-04-2016, 07:50 PM.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Getting that picture was trickier than I thought it would be. Things sure do look different when under a magnifying glass. I also figured I would put DU1 on the list as well being that I left it out
DU1
AZ7805T
E1
718G70
PIN 1= 11.86
PIN 2=0
PIN 3= 5.06
I also rechecked the voltages on DU4 and nothing as changed.Attached FilesLeave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Absolutely... As soon as I get off work I will get those pictures posted for you.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Can I get good closed up pictures of this DU4 so I can see how the 3 legs are connected?
Looking at this picture: https://www.badcaps.net/forum/attach...6&d=1454392483
The DU4 looks to be an Adjustable 1117.Last edited by budm; 02-04-2016, 09:39 AM.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Rechecked DU4
DU4
AMC1117
F0720F
PIN 1= 0
PIN 2=.67
PIN 3= 3.32Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
U4 OK, 3.3V REG
)117bb
17-33l
pin 1=0
pin 2=3.35
pin 3=5.21
u5 Bad, 1.25v ref + 0.46adj = 1.71V, you have 1.29V Out.
amc1117
f0720f
pin 1=.46
pin 2=1.29
pin 3=3.35
u6: OK, 3.3V REG
)117bb
17-33l
pin 1=0
pin 2=3.33
pin 3=5.21
u8: OK, 3.3V Vreg
)117bb
17-33l
pin 1=0
pin 2=3.35
pin 3=5.15
u9:OK, 1.8V Vreg
amc1117
18f0641j
pin1= 0
pin 2= 1.81
pin 3= 3.35
u10: OK, 1.8V Vreg
amc1117
18f0641j
pin 1= 0
pin 2= 1.81
pin 3=3.35
u7: OK, 1.8V Vreg
amc1117
18f0641j
pin 1= 0
pin 2=1.81
pin 3= 3.35
u18: OK, 1.25Vref + 0.25Vadj = 1.50Vout
amc1117
f0720f
pin 1= .25
pin 2= 1.51
pin 3= 3.35
du2: OK, 3.3V Vreg
)117bb
17-33l
pin 1=0
pin 2= 3.32
pin3=5.12
du3: OK, 2.5V Vreg
)116lc
17-25l
pin 1=0
pin 2=2.52
pin 3=5.12
du4 Bad. This one needs verification on the P/N. Output cannot be lower than Vref which is 1.25V.
amc1117
f0720f
pin 1= 0
pin 2=.66
pin 3= 3.32
u16: OK, 2.5V Vreg
)116lc
17-25l
pin 1=0
pin 2=2.52
pin 3=5.14Last edited by budm; 02-04-2016, 12:32 AM.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Ok just replaced the battery with a brand new one and did some retesting... Just redid all the values, sorry about this... what a difference a new battery makes! Thank you for the suggestion
U4
)117BB
17-33L
PIN 1=0
PIN 2=3.35
PIN 3=5.21
U5
AMC1117
F0720F
PIN 1=.46
PIN 2=1.29
PIN 3=3.35
U6
)117BB
17-33L
PIN 1=0
PIN 2=3.33
PIN 3=5.21
U8
)117BB
17-33L
PIN 1=0
PIN 2=3.35
PIN 3=5.15
U9
AMC1117
18F0641J
PIN1= 0
PIN 2= 1.81
PIN 3= 3.35
U10
AMC1117
18F0641J
PIN 1= 0
PIN 2= 1.81
PIN 3=3.35
U7
AMC1117
18F0641J
PIN 1= 0
PIN 2=1.81
PIN 3= 3.35
U18
AMC1117
F0720F
PIN 1= .25
PIN 2= 1.51
PIN 3= 3.35
DU2
)117BB
17-33L
PIN 1=0
PIN 2= 3.32
PIN3=5.12
DU3
)116LC
17-25L
PIN 1=0
PIN 2=2.52
PIN 3=5.12
DU4
AMC1117
F0720F
PIN 1= 0
PIN 2=.66
PIN 3= 3.32
U16
)116LC
17-25L
PIN 1=0
PIN 2=2.52
PIN 3=5.14Last edited by bleed4me; 02-03-2016, 09:07 PM.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
There are many readings. you need to check your meter first and make sure the batteries are good and the setting is set to DCV.
U4 Bad, it is 3.3V regulator, you are getting 4.06V
)117BB
17-33L
PIN 1=0
PIN 2=4.06
PIN 3=6.30
U5 Bad, 1.25V ref +0.56 = 1.81
AMC1117
F0720F
PIN 1=.56
PIN 2=1.56
PIN 3=4.02
U6 Bad, it is 3.3V regulator
)117BB
17-33L
PIN 1=0
PIN 2=3.76
PIN 3=5.85
U8 Bad, it is 3.3V regulator
)117BB
17-33L
PIN 1=0
PIN 2=4.07
PIN 3=6.24
U9 Odd output Voltage
AMC1117
18F0641J
PIN1= 0
PIN 2= 2.16
PIN 3= 3.98
U10, Odd output Voltage
AMC1117
18F0641J
PIN 1= 0
PIN 2= 2.18
PIN 3=4.01
U7
AMC1117
18F0641J
PIN 1= 0
PIN 2=2.15
PIN 3= 3.96
U18 Bad, 1.25V ref + 0.29 = 1.54
AMC1117
F0720F
PIN 1= .29
PIN 2= 1.78
PIN 3= 3.92
DU2 Bad, it is 3.3V reg.
)117BB
17-33L
PIN 1=0
PIN 2= 3.88
PIN3=5.96
DU3 Bad, it is 3.3V reg.
)116LC
17-25L
PIN 1=0
PIN 2=2.9
PIN 3=5.86
DU4
AMC1117
F0720F
PIN 1= 0
PIN 2=.78
PIN 3= 3.83
U16
)116LC
17-25L
PIN 1=0
PIN 2=2.88
PIN 3=5.82Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
First I just want to say hats off to budm for his thread /tutorial for Voltage Regulator (LDO) testing, thats good reading right there so thank you for that. So I tested the voltages then checked then rechecked just to make sure. As far as the part number I did the best I could that wasnt an easy task. There were some that had a backwards C so I will use " ) " in its place. If there are any you want me to recheck please let me know and I will get right on it. Also if the format is incorrect please let me know. Thanks
U4
)117BB
17-33L
PIN 1=0
PIN 2=4.06
PIN 3=6.30
U5
AMC1117
F0720F
PIN 1=.56
PIN 2=1.56
PIN 3=4.02
U6
)117BB
17-33L
PIN 1=0
PIN 2=3.76
PIN 3=5.85
U8
)117BB
17-33L
PIN 1=0
PIN 2=4.07
PIN 3=6.24
U9
AMC1117
18F0641J
PIN1= 0
PIN 2= 2.16
PIN 3= 3.98
U10
AMC1117
18F0641J
PIN 1= 0
PIN 2= 2.18
PIN 3=4.01
U7
AMC1117
18F0641J
PIN 1= 0
PIN 2=2.15
PIN 3= 3.96
U18
AMC1117
F0720F
PIN 1= .29
PIN 2= 1.78
PIN 3= 3.92
DU2
)117BB
17-33L
PIN 1=0
PIN 2= 3.88
PIN3=5.96
DU3
)116LC
17-25L
PIN 1=0
PIN 2=2.9
PIN 3=5.86
DU4
AMC1117
F0720F
PIN 1= 0
PIN 2=.78
PIN 3= 3.83
U16
)116LC
17-25L
PIN 1=0
PIN 2=2.88
PIN 3=5.82Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Next step will be to check all the DCV on all 3 pins of the 1117 series LDO regulator ICs on the main board to see if they are all OK OR NOT.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
OK, that is why the backlights are not ON, you still do not have BL-ON signal from the main board.
So 'B' is the BL-ON pin on the power supply board.Leave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Budm I just checked and rechecked then checked again it is indeed .03 and funny you mention pin 12 on the master because I was checking on this earlier and that voltage is 0. The voltages for the both master and slave are as followed
Master CN1
14 lamp st =0
13 vbr_b=1.3
12 on/off=0
11 vbr_a=
10 gnd=0
9 gnd=0
8 gnd=0
7 gnd0
6 gnd=0
5 vin=25
4 vin=25
3 vin=25
2 vin=25
1 vin=25
fuse shows continuity and has a voltage of 25.2 on both sides
Slave CN101
1 VIN=25.5
2 VIN=25.5
3 VIN=25.5
4 VIN=25.4
5 VIN=25.4
6 GND=0
7 GND=0
8 GND=0
9 GND=0
10 GND=0
11 NC=0
12 NC=0
fuse shows continuity and has a voltage of 25.5 on both sidesLeave a comment:
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Re: Vizio GV47LFHDTV10A No Picture No Sound Fix
Correction, one of them only show 0.03V? for sure?
If I remember it correctly, 'A' is for the BL-ON, and 'B' is for Dimming control.
Pin 12 on the MASTER Inverter is the BL-ON, you can check on that pin to make sure the signal does get to the inverter board.Last edited by budm; 02-02-2016, 12:07 AM.Leave a comment:
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