M60-C3 No PIC, No Backlight, No Audio

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • yoyokafka
    New Member
    • Sep 2020
    • 3
    • United States
    #1

    M60-C3 No PIC, No Backlight, No Audio

    First post here: There are already a handful of threads on this TV w/ similar symptoms, but I've worked on mine to a point where I've got strange symptoms I haven't seen anywhere else.

    VIZIO M60-C3
    Initially, I had no picture, backlight or audio. Power LED on bottom and red audio LED on main board lights up and goes away.

    PS_ON: 0V
    T CON_ON: 0V
    12V T CON: 0V
    etc.

    Took out the main board and cooked it in the oven for a little. Reinserted and found that the backlight would turn on and I got the bootup "V"...but then it would shut off again. Every 30s or so, it would kick back on and do the same thing.

    What I found from the readings then, was over double voltage for everything!
    12V TCON is 26.3V
    12V-AU is 28.8
    PC_ON is 10.4

    What's the deal?
    Anything else I should check for? Is this a Power Supply issue or still my main board? Any help is appreciated.
    Last edited by yoyokafka; 09-15-2020, 06:38 PM. Reason: Specify make model
    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • samson7point1@yahoo.com
      Help troubleshooting an audio problem with an RCA SGT-250 CED Player
      by samson7point1@yahoo.com
      The Problem: This player has a toggle switch to select between Stereo, Mono R, and Mono L. Regardless of the setting it outputs the sound to both the L&R audio jacks. In the Mono R position, the audio output level is normal (from both the L and R audio output jacks), in the Stereo position the audio output is about half the volume, and in Mono L, it's about 3/4 the volume. Something about putting it into Stereo mode is causing the volume to drop significantly and I can't figure it out.

      The player processes the audio signal using two different reference frequencies. The "R"...
      PW300S circuit diagram
      2 Photos
      04-30-2024, 11:22 AM
    • triplefour
      UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
      by triplefour
      this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
      i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
      unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
      according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
      09-13-2023, 10:43 PM
    • DanPoka
      Guide me through repairing a Dell p2210f LCD ccfl backlight monitor
      by DanPoka
      I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
      Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
      This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered...
      02-15-2025, 05:05 AM
    • Comp_Pro
      No Backlight Macbook A1990 820-01041
      by Comp_Pro
      Hello all,

      Am trying to figure out this backlight issue with this A1990 Macbook Pro.

      Tests performed:

      There is no backlight even with a good screen.
      Backlight IC is receiving the correct support voltages.
      Fuse F8400 ok
      Current sense resistor R8400 ok
      Backlight IC is receiving 3.3V on enable pin.
      Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
      Backlight IC receiving 5V from PP5V_G3S
      Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
      I2C_BKLT_SCL and I2C_BKLT_SDA both measure...
      05-06-2024, 10:23 PM
    • cheebster
      iPad Pro 12.9 5th Gen Backlight Issue
      by cheebster
      Hello, got an iPad Pro A2378 12.9 5th gen with no backlight. Got another test unit without screen, tested the screen, still no backlight with the test unit.
      Figured out the backlight on the screen was bad, ordred a new backlight from mobilesentrix, *carefully replaced it* without damaging the lcd, oh well.
      Final result, issue is still there, the screen has no back lights. So i'm back to square one, with 3 hours less and 100$ out, issue still on the screen.
      The panel is still ok, i can see the apple in the middle of the screen when it kicks in, just no backlight.
      Anyone...
      05-20-2025, 09:17 AM
    • Loading...
    • No more items.
    Working...