Vizio GV47LFHDTV10A No Picture No Sound Fix

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Well I replaced the f3 fuse with the link you provided johnboy1313 and I am getting a voltage reading of 5.3 on either side of the fuse and the tv is behaving in the same manner with the same symptoms.

[johnboy1313]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Well, that's a step in the right direction. Are you sure you got all of the connectors plugged back in?

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

I'm currently not at home to double check but I am almost positive that I connected everything back up.

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Ok made it home and checked the connects to make sure they were all secure and they are. One thing I did notice though was after looking at Budm pictures of his fix his board has a ground wire that mine does not, would that make the difference?

[Nick's Tvs]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

bleed4me,
I just replied to your last personal message with a few tips on how to make sure your solder joint was proper since you may possibly have a good top solder connection but bad lower solder joint and still get 5 volts on both sides of the fuse but not actually have the 5 volts run through the board.
Lastly I recently fixed one of these a few weeks ago and may have a prospective buyer in a few days on it. However I still have it in the shop for the next few days at least so if you have any questions on voltage reading on certain parts of the main board, or certain readings on components let me know asap before I don't have the ability to double check for you.

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Just curious but I know low voltage readings on a power supply board can cause issues, so could a higher voltage reading cause an issue as well? Here are the voltage readings off the power supply board as well as the main board.


pin 1
27.2
27.1
27.1
27.1
27.1
0
0
0
0
0

pin 2
26.9
26.8
26.8
26.7
26.7
0
0
0
0
0
1.3
0

pin 3
26.4
26.3
0
0

pin 4
5.4
12.6
12.6
12.5
0
0
0
0
0
5.4
5.4
5.4
1.2
0


Incoming voltage to main board from left to right
0
1.2
5.1
5.1
5.1
0
0
0
0
0
11.9
11.9
11.9
5.1

[budm]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

No pin names for each pin to tell us what the function of each pins are?

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Sorry about that, was working on getting good pictures.

[budm]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

pin 4
5.4
12.6
12.6
12.5
0
0
0
0
0
5.4
5.4
5.4
1.2
0

What do you mean by PIN 4?
You need to report in this format: for example
CN5:
Pin 1 (PS-ON) = xxxx V
PIN 2 (12V) = xxx V
PIN 3 (12V) = xxx V

https://www.badcaps.net/forum/attach...0&d=1454187031

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Thank you Budm for showing me the proper format to write this so everyone can understand, it is much appreciated. Please let me know if I need to make changes to it. Sorry for the confusion

CN2
PIN 1(24VI)=27.2
PIN2(24VI)=27.1
PIN 3(24VI)=27.1
PIN 4(24VI)=27.1
PIN 5(24VI)=27.1
PIN 6 SGND=0
PIN 7 SGND=0
PIN 8 SGND=0
PIN 9 SGND=0
PIN 10 SGND=0

CN3
PIN 1 (24VI)=26.9
PIN 2 (24VI)=26.8
PIN 3 (24VI)=26.8
PIN 4 (24VI)=26.7
PIN 5 (24VI)=26.7
PIN 6 SGND=0
PIN 7 SGND=0
PIN 8 SGND=0
PIN 9 SGND=0
PIN 10 SGND=0
PIN 11 A=1.3
PIN 12 B=0
PIN 13 C=0

CN4
PIN 1 (24VA)=26.4
PIN 2 (24VA)=26.3
PIN 3 SGND=0
PIN 4 SGND=0

CN5
PIN 1 (PSON)=5.4
PIN 2 (12V)=12.6
PIN 3 (12V)=12.6
PIN 4 (12V)=12.5
PIN 5 SGND=0
PIN 6 SGND=0
PIN 7 SGND=0
PIN 8 SGND=0
PIN 9 SGND=0
PIN 10 (5VSB)=5.4
PIN 11 (5VSB)=5.4
PIN 12 A =5.4
PIN 13 B=1.2
PIN 14 C=0


Incoming voltage to main board from left to right
PIN 1 L ON=0
PIN 2 PWDLM=1.2
PIN 3 (5VSB)=5.1
PIN 4 (5VSB)=5.1
PIN 5 (5VSB)=5.1
PIN 6 GND=0
PIN 7 GND=0
PIN 8 GND=0
PIN 9 GND=0
PIN 10 GND=0
PIN 11 (12V)=11.9
PIN 12 (12V)=11.9
PIN 13 (12V)=11.9
PIN 14 PWR ON=5.1

[budm]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Can I see the pictures of the inverter board?
BTW, these must be your erro in the readings:
CN3:
PIN 11 A=1.3
PIN 12 B=0
PIN 13 C=0

CN5:
PIN 12 A =5.4
PIN 13 B=1.2
PIN 14 C=0

Pin A on CN3 is directly connected to Pin A of CN5.
Pin B on CN3 is directly connected to Pin B of CN5.
Pin C on CN3 is directly connected to Pin C of CN5.

So there is no way you can have different readings between the CN3 and CN 5.

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Here are the inverters, hopefully the pics turn out. As soon as I get home I will revisit those voltages and report back. Thank you.

[budm]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

So far you readings look to be OK.
So you have MASTER/SLAVE Inverter setup.
Are the fuse on both inverters OK?
http://www.shopjimmy.com/catalogsear...+GV47LFHDTV10A

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Had a chance to revisit the voltages and you are absolutely right Budm, there was an error

C3
A=1.42
B=.03
C=0

C5
A=1.42
B=.03
C-0

Thank you for catching that. I checked the fuses on the master and slave inverter and they appear just fine

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

NickTV here is the picture you requested.

[budm]

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.

[bleed4me]

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 sides

[budm]

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.

[budm]

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.

[bleed4me]

Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

Are you referring to pin 1 on the main board that gives the signal to BL-ON on the power supply board?