Vizio D650I-B2

[heavymachines]

Ok this one is the biggest set i have worked on and is different design that i am used to dealing with. no signs of life.

Open her up " was a pain" btw due to metal snap clips.


First glance everything looks ok nothing standing out.

started to check for voltages. and we have stability issues here will list voltages in next post.

[heavymachines]

Re: Vizio D650I-B2

CN101 WITH MAIN CONNECTED.

1. 5VSB = 1.4 TO 1.8 V
2. 5VSB = 1.4 TO 1.8 V
3. AcOffDet .522v to .674v
4. PS_ON .418 to ..563v
5.gnd
6.gnd
7. 5v res .022v to 1.676
8. same as 7
9. gnd
10. gnd
11.Reg 12v= 4.60 to 5.14
12. same as 11
13. Vblon 0v
14.Dim= 0v
15. lamp det= .023 to .134v

[heavymachines]

Re: Vizio D650I-B2

CN201
1. 24V = 23.45 TO 24.26
2. SAME AS 1
3.GND
4.GND

CN202
1.VDDB
2.VDDB
3.VDDB
4.VDDB
5.VDDB= 23.86V TO 24.02V pin 4.3.2.1. is same
6.gnd
7.gnd
8.gnd
9.gnd
10.gnd
11.lamp det= .026 to .119v
12.Vblon .000v
13.N/C
14. Dim .001v

[heavymachines]

Re: Vizio D650I-B2

Cn203
1.vddb
2.vddb
3.vddb
4.vddb
5.vddb 23.9v to 24.01
6.Bl gnd
7.bl gnd
8.bl gnd
9.bl gnd
10bl gnd
11.N/C
12.N/C

[heavymachines]

Re: Vizio D650I-B2

ok with main disconnected voltages do stabilize the ones present anyways i have no idea how to force this set on since it has a led driver board. interesting anyhow.

Cn101
1. 5vsb=5.04v
2. same as 1
3. Ac det= .003v
4 Ps_on 0v
5. gnd
6 gnd
7. 5v res= 5.04v
8.nothing else just dead on rest of pins on all connectors on ps.

[heavymachines]

Re: Vizio D650I-B2

Looking like a main problem. Due to unstable voltages, but i want to be sure.

[CapLeaker]

Re: Vizio D650I-B2

You have a main board problem. Something is putting a heavy load on the 5VSB rail. Since that 5VSB rail is getting loaded down so hard, something must be getting hot on the main board.

[heavymachines]

Re: Vizio D650I-B2

The hottest device on main is Ic1 which is a LD1117AG voltage regulator only reaches 94 degrees f. other LD1117 only reaches about 74 degrees f.
Nothing smoking hot...

[Andrew F. Ali]

Re: Vizio D650I-B2

Either the LD1117AG regulator has a short or what ever it is feeding has a short, but definitely a Main Bd issue. Replace or repair is the next question to be addressed.

[heavymachines]

Re: Vizio D650I-B2

replaced regulator no dice, followed high resistance right to cpu toast new board on its way. will update results.

[heavymachines]

Re: Vizio D650I-B2

Replaced main and still same problem, now where to look lol?

[CapLeaker]

Re: Vizio D650I-B2

with the main board connected to the PSU, the 5VSB is still down? Can we see pictures of your PSU and main board?

[heavymachines]

Re: Vizio D650I-B2

with the main board connected to the PSU, the 5VSB is still down? Can we see pictures of your PSU and main board?

yeah 5vsb is still down to like 1.4 to 1.9 fluctuating.


Pics coming soon

[heavymachines]

Re: Vizio D650I-B2

Here are the pics

[ecking767]

Re: Vizio D650I-B2

I will check the power supply the +5 volts. your main boards fuse isn't blowing so there is no short. you could have bad diode or a bad caps on your power supply board.

check out those diodes and caps on you power supply board

[heavymachines]

Re: Vizio D650I-B2

I will check the power supply the +5 volts. your main boards fuse isn't blowing so there is no short. you could have bad diode or a bad caps on your power supply board.

check out those diodes and caps on you power supply board

they're fine

[heavymachines]

Re: Vizio D650I-B2

Still looking around to figure this thing any help would be great.

[heavymachines]

Re: Vizio D650I-B2

okay figured it out it was the ir board for remote it was loading down main. tv works good now

[budm]

Re: Vizio D650I-B2

Good job finding the problem.
Can we see the pictures of the IR board?
The IR board runs on 3.3V or 5V?

[heavymachines]

Re: Vizio D650I-B2

Also both smd caps needed replacement on ir board.... all is well