Vizio M65-C1 won't power on

[Jcampitelli]

I have a Vizio M65-C1 that won't power on. I've purchased a replacement power supply and main board but the TV exhibits the same behavior. I've purchased a multimeter, I'm just not sure where to start.

I've attached pictures of the boards, courtesy of shopjimmy. Watching some YouTube videos to test the power supply, I wanted to test the standby power voltage. I couldn't find any pins labeled as standby, so I'm assuming it's pins 1 and 2 on the power supply. They are labeled 5V/3.5V.

The only indication that I have power is a constant flashing blue/purple LED401 on the main board anytime I provide power to the TV.

Can someone point me in the right direction? I'm new to TV troubleshooting.

[nomoresonys]

Re: Vizio M65-C1 won't power on

See if you have your 5 volts, see the little legend/map it points to the connector, look at the second video below, shows powersupply testing.

[nomoresonys]

Re: Vizio M65-C1 won't power on

Test them all see if you get expected voltage.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

When I perform the test the meter voltage fluctuates on all of the wires.

Pins 1 and 2 show 2.5V and 4.84V. The pins that are matked 12V fluctuate between 6V and 13V. Am I not getting a good connection? The video had a constant reading on the pins.

I'm sticking the test lead into the plastic connector where the wire goes.

[nomoresonys]

Re: Vizio M65-C1 won't power on

Is your meter battery good? try checking something else or switch the battery out if the meter was sitting for a long while the battery could be low.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

It's a brand new unit and battery. I tested on an outlet and its flickering between 122.6 and 122.7 volts

[budm]

Re: Vizio M65-C1 won't power on

Meter set to DC V? Just to be sure.
https://www.badcaps.net/forum/attach...8&d=1521890534
The board is made to fit two different connectors for CN9101/CN9102,
Based on that pictures your board is fitted with with CN9101 so the DC V on pin 1 and 2 should be 5V.
You should run the power supply board by itself without connecting to the main board, the report ALL the DC V reading of the pins, you MUST put down the pin name and FOLLOW by the Volatge reading for each pin so we do not have to guess what you have on each pin.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

Yes its set to DC V. I tested the outlet using AC V.

[budm]

Re: Vizio M65-C1 won't power on

See updated post 7.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

Ok I ran the power board by itself and here are the readings

CN9101 -
Pin 1 - 0v
Pin 3 - 19v
Pin 5 - 19v
Pin 7 - 19v
Pin 9 - gnd
Pin 11 - gnd
Pin 13 - 0v
Pin 15 - 0v

CN9102 -
Pin 2 - 0v
Pin 4 - 19v
Pin 6 - 19v
Pin 8 - 19v
Pin 10 - gnd
Pin 12 - gnd
Pin 14 - 0v
Pin 16- 0v

[budm]

Re: Vizio M65-C1 won't power on

Ok I ran the power board by itself and here are the readings

CN9101 -
Pin 1 - 0v
Pin 3 - 19v
Pin 5 - 19v
Pin 7 - 19v
Pin 9 - gnd
Pin 11 - gnd
Pin 13 - 0v
Pin 15 - 0v

CN9102 -
Pin 2 - 0v
Pin 4 - 19v
Pin 6 - 19v
Pin 8 - 19v
Pin 10 - gnd
Pin 12 - gnd
Pin 14 - 0v
Pin 16- 0v

You MUST put down the pin name and FOLLOW by the Volatge reading for each pin so we do not have to guess what you have on each pin.
We have no idea what all those pins are for since we do not have the board in front of us to look at.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

Sorry about that. With everything disconnected from the power supply:

CN9101 -
PIN 1 - +5V/+3.5V - 0V
PIN 3 - +12V - 19V
PIN 5 - +12V - 19V
PIN 7 - +12V_A - 19V
PIN 9 - GND - 0V
PIN 11 - GND - 0V
PIN 13 - 3D - 0V
PIN 15 - ON/OFF - 0V

CN9102 -
PIN 2 - +5V/+3.5V - 0V
PIN 4 - +12V - 19V
PIN 6 - +12V - 19V
PIN 8 - +12V_A - 19V
PIN 10 - GND - 0V
PIN 12 - GND - 0V
PIN 14 - PS_ON - 0V
PIN 16 - DIM - 0V

CN9201 -
PIN 1 - ON/OFF - 0V
PIN 3 - 3D - 0V
PIN 5 - GND - 0V
PIN 7 - GND - 0V
PIN 9 - GND - 0V
PIN 11 - +24V - 0V
PIN 13 - +24V - 0V

CN9203
PIN 2 - DIM - 0V
PIN 4 - +12V - 19V
PIN 6 - GND - 0V
PIN 8 - GND - 0V
PIN 10 - +24V - 0V
PIN 12 - +24V - 0V
PIN 14 - +24V - 0V

[budm]

Re: Vizio M65-C1 won't power on

OK, looking at the bottom side of the board, based on the trace lay out, pin 1 and pin 2 are not used for the 5V, the standby Voltage on this TV is 12V_A, the 12V PIN 3 -6 is also supply by the same 12V STBY circuit.
T9101 is the transformer for the 12V_A, this board uses Synchronous rectification circuit to make the 12V via MOSFET Q9104, Q9111, D9104, D9106, IC9111.
So the 12V is swinging like crazy at this point.
Can you read the PN of IC9111?
Hook all the board back in place then heat up the standby power supply section for 2~3 minutes with hair dryer then plug the TV into the let to see if the 12V will be stable or not.
May be startup/running caps C9103, 9109 in the primary side are bad.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

The PN on IC9111 on my original power supply is:

SP601BE
CF2A871.1
20150129

Keep in mind at this point I have purchased a replacement power supply and main board

[budm]

Re: Vizio M65-C1 won't power on

Are you saying youe replacement power supply 12VA_A is going up and down between 12 and 19V when running the power supply board by itself and 6 ~ 13V when connected to the main board, if that is the case then it is not right since standby Voltage should be steady, may be you can run the power supply by itself and use resistor as dummy load to draw about 1A from it and it should be steady, if not then power supply is bad.

[Jcampitelli]

Re: Vizio M65-C1 won't power on

Both power supplies read 19V on +12V_A when either power supply runs solo. Furthermore, both power supplies read between 6V~13V when the old or new main board is connected. This leads me to believe the issue is not power supply or main board related or I'm not getting a good reading from the power supply when the main board is connected. If I put a meter on the main board, I get the same fluctuation from the connection coming from the power supply 6V~13V.

[nomoresonys]

Re: Vizio M65-C1 won't power on

https://www.youtube.com/watch?v=mUvclBfaMXg Testing powersupply, you don't have to remove the board from tv, just MAKE SURE you unplug all other boards from powersupply.

[nomoresonys]

Re: Vizio M65-C1 won't power on

https://www.youtube.com/watch?v=8K2Wq5kvCJs

[budm]

Re: Vizio M65-C1 won't power on

Both power supplies read 19V on +12V_A when either power supply runs solo. Furthermore, both power supplies read between 6V~13V when the old or new main board is connected. This leads me to believe the issue is not power supply or main board related or I'm not getting a good reading from the power supply when the main board is connected. If I put a meter on the main board, I get the same fluctuation from the connection coming from the power supply 6V~13V.

That is why I suggested to use resistor as the load to test the power supply to find out if it is cable of supplying steady 12V as label indicates or not.

[budm]

Re: Vizio M65-C1 won't power on

Both power supplies read 19V on +12V_A when either power supply runs solo. Furthermore, both power supplies read between 6V~13V when the old or new main board is connected. This leads me to believe the issue is not power supply or main board related or I’m not getting a good reading from the power supply when the main board is connected. If I put a meter on the main board, I get the same fluctuation from the connection coming from the power supply 6V~13V.

Per your report per post 12 without having the main board connected, the 12V is not steady at all.
That is why I suggested to have resistor load connected to the power supply to see if it will be steady or not.
CN9101 -
PIN 1 - +5V/+3.5V - 0V
PIN 3 - +12V - 19V
PIN 5 - +12V - 19V
PIN 7 - +12V_A - 19V
PIN 9 - GND - 0V
PIN 11 - GND - 0V
PIN 13 - 3D - 0V
PIN 15 - ON/OFF - 0V