vizio e600b3 power supply

[thee8ball]

Hello,

This is my 1st time at fixing LED TVs.

Problem: 5 year old vizio e600b3 suddenly stopped working.

Issue: After pulling back off the and viewing many, many, videos I replaced my 30+ year old analog ohm-meter and bought a uni-t 61E digital multimeter. I diagnosed the issue as a problem with the Power Board as there was 0 voltage on the 4 - 27 volt pins. I ordered a new PCB from online supplier.

New Issue: I installed the 'new' power board and I still have 0 voltage on the 4 - 27 volt pins !! I removed the cables connecting the power board to the main board and the readings and received the same readings. I have a pic of the new board with labels on the 27 volt pins.

Any ideas???

[nomoresonys]

Re: vizio e600b3 power supply

You want to test connector on powerboard with the 15 pins, it's the longer one of the two there. Test connector from mainboard to powerboard on powerboard side with all boards hooked up, test with tv plugged in but off then hit power, report both conditions here, give pin number, pin description/name and condition both off and when you hit power on.

[nomoresonys]

Re: vizio e600b3 power supply

Check the fuse on powerboard if you didn't already.

[thee8ball]

Re: vizio e600b3 power supply

thanks. will do

[nomoresonys]

Re: vizio e600b3 power supply

Testing procedure in second link of signature below if needed.

[thee8ball]

Re: vizio e600b3 power supply

I thought ground lead was to the nearest board screw?

[nomoresonys]

Re: vizio e600b3 power supply

Lots use chassis/metal back of tv for ground for this testing, meter set at 20 vdc.

[R_J]

Re: vizio e600b3 power supply

Check CN201 (Pins 8or9) for 12 volts, next check pin 3 (PS-ON), press the power button and see if the PS-ON voltage changes. If the PS-ON does not change, it could be a main board fault
You won't have +27 volts untill the power supply board is turned on (PS-ON) It looks like CN201 pins 10~13 are not used
When the power supply board is turned on you should get 12V-AU on cn201 pin4

[thee8ball]

Re: vizio e600b3 power supply

my ps-on pin3, doesn't change voltage, everything else you said checks out. What is really odd is on the cn301 lead ,pin 8 (isns) is giving me some odd readings: it is all over the place; plugged in - off or power on - between a high of .54v to a low of almost 0v. also it reads almost like there is a charge and disharge in the range. usually it hangs around.22v-.32v. I will type out all the pin voltage reads in the morning. thanks for your help

[thee8ball]

Re: vizio e600b3 power supply

All plugged in off, power on

301 cable

pin1 27v_led: off-0v, on-0v
pin2 27v_led: off-0v, on-0v
pin3 27v_led: off-0v, on-0v
pin4 27v_led: off-0v, on-0v
pin5 gnd: off-0v, on-0v
pin6 gnd: off-0v, on-0v
pin7 gnd: off-0v, on-0v
pin8 isns: off-.12~.65v, on-12~.65v*
pin9 vsns: off-0v, on-0v
pin10 gnd: off-0v, on-0v


201 cable

pin1 nc: off-0v, on-0v
pin2 ac-det: off-.37v, on-.37v
pin3 ps-on: off-3.38v, on-3.38v
pin4 12v-au: off-12.3v, on-12.3v
pin5 gnd: off-0v, on-0v
pin6 gnd: off-0v, on-0v
pin7 gnd: off-0v, on-0v
pin8 12v: off-12.3v, on-12.3v
pin9 12v: off-12.3v, on-12.3v
pin10 nc: off-0v, on-0v
pin11 led_on: off-0v, on-0v
pin12 led_br: off-0v, on-0v
pin13 nc: off-0v, on-0v
pin14 12v t con:off-0v, on-0v
pin15 t con_on:off-0v, on-0v

* these readings don't make sense but I have duplicated them on numerous times

[budm]

Re: vizio e600b3 power supply

https://assets.shopjimmy.com/media/c...030-00-top.jpg
What Voltage do you when measured between the two legs of either one of the two main filter caps (68uf 450vdc rated) in the hot side? It should be about 380 ~ 400VDC.
The main board is also not sending any control signals on pin 11, 12, 14, and 15 (without pin's names) of cn201.

[nomoresonys]

Re: vizio e600b3 power supply

Seems like a mainboard fault, try with tv unplugged from outlet, unplug cable from powerboard to mainboard, plug tv back into outlet, take readings on the same pins 1-15 see what you get, be careful to only touch one pin at a time with probe.

[thee8ball]

Re: vizio e600b3 power supply

What Voltage do you when measured between the two legs of either one of the two main filter caps (68uf 450vdc rated) in the hot side? It should be about 380 ~ 400VDC.

Can I measure this with a multimeter while the cap is on the board? I thought I need an evr?

[budm]

Re: vizio e600b3 power supply

Can I measure this with a multimeter while the cap is on the board? I thought I need an evr?

Of course you have to test the Voltage between the two legs of the cap with it still on board and TV is plugged in and powered up, you will be working in the deadly side of the circuit so I hope you know what you are doing. We are trying to find out if the PFC Voltage booster circuit is working or not.
What is 'evr'?

[nomoresonys]

Re: vizio e600b3 power supply

EVR=ENERGY VERIFYING RAYGUN.

[thee8ball]

Re: vizio e600b3 power supply

I decided to use my Energy Verifying Raygun (EVR) and now Everything works! The esr meter was worthless.

Well, I do know it was the power not the main board because I was mixing up 2 power boards - and one them works. And, The tv turned on and the voltages were okay.

I want to thank nomoresonys and budm for Taking the time to help me. Hope next time to have a more challenging project.

[nomoresonys]

Re: vizio e600b3 power supply

Glad to hear, lets keep saving them.