Vizio E470Vl no backlight problem

Collapse
X
 
  • Time
  • Show
Clear All
new posts

Related Topics

Collapse

  • Bugman1400
    Vizio E470VL got +5VSB, but no 12V
    by Bugman1400
    EDITED: I thought my Vizio E470VL has +5VSB and no 12v on the PS board, but after plugging the cable back in and testing the pins on the Main board I realized that I do have 12V. I assume the 12V is turned on when the ON/OFF switch is pressed. The Vizio light in front does go from Standby Orange to White when ON. But, I still have no picture or sound. Test values of PS board are below.

    +5VSB= +5.09
    12V= +12.18
    PS_ON= +2.25
    I_ON/OFF= +3.27
    LAMP= +3.18
    DIM= +2.97

    Any more testing I can do on Main board or is it just a replacement?...
    09-04-2022, 09:19 AM
  • Tynan Dill
    Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
    by Tynan Dill
    I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

    Upon bringing it home and plugging it up, it showed a standby light.

    I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

    The screen seems to blackout and stay black, but with a flashlight I can see the display.

    With my Playstation 4 connected via HDMI, and running a game I can hear sound.

    Assuming...
    11-22-2024, 01:46 PM
  • dholley
    Vizio TV E470VL SMPS Flucuation Output Voltage
    by dholley
    Would someone please help troubleshoot a Vizio 47" TV Switch Mode Power Supply with 5 volt output fluctuating voltage. The voltage fluctuates at 5 the volt output and at the Pulse Switch Modulating IC at VCC. I have the following notes:

    1. The 3 main filter caps all have approximately 167 volts steady
    2. I have replaced 4 mosfets next to what I think is called the inventor transformer (big black transformer) pictures attached
    3. I have replaced Fuse F102 with an equivalent
    4. I have check all diodes and caps and they seem to be ok
    5. I replaced the 431...
    01-20-2022, 03:12 PM
  • howardc64
    Vizio M65Q7-H1 Red Vertical Strips fixed by tape blocking LC1 signal to half of the panel
    by howardc64
    Failure Symptom



    No picture, just red vertical stripes. Google search shows quite common problem for these recent Vizio M series although red vertical stripe pattern may differ. Some call it "Netflix" boot screen haha.

    Where is the short?

    Panel has 4x buffer boards. Quickly found the 1/4 panel buffer board with the problem by selectively disconnecting buffer board flex cables.



    Having recently fixed another Vizio with similar symptoms that was a shorted ESD diode array ( link ) Probed the ESD diode array but...
    05-27-2025, 02:56 PM
  • прямо
    Viper22A 5VSB circuit
    by прямо
    So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.

    In the process of poking around, I also lost a zener diode that stabilize the voltage coming from...
    01-13-2024, 07:05 PM
  • Loading...
  • No more items.
Working...