Sanyo p50747-04 shuts off after a few seconds, but has pic...

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • football0062
    Senior Member
    • Dec 2011
    • 98
    #1

    Sanyo p50747-04 shuts off after a few seconds, but has pic...

    strange issue ive been trying to chase here, the Z board had a bad cap and blown 1amp pico fuse on the 15v line. replaced and now i get the screen to come on shows 03 in corner but still shuts back off in few seconds. ive downloaded the SM for it and it talks about the power failure circuit, but on the board i have i can only find 1 IC there talking about.

    the strange thing is that when it comes on i do get display, showing channel 3 in the top right corner.

    ive done the logic board test pattern and its perfect as well. i know that part is separate from the main board but was ruling things out.

    i attached the SM maybe someone can pick up on something im missing?
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

    Tags: None
    • football0062
      Senior Member
      • Dec 2011
      • 98
      #2
      Re: Sanyo p50747-04 shuts off after a few seconds, but has pic...

      Anyone have any idea? Would just buy a new board but they are not readily available

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: Sanyo p50747-04 shuts off after a few seconds, but has pic...

          Can you check the Vs voltage while it runs and just as it cuts off?
          Also, check that the power button is not stuck.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • football0062
              Senior Member
              • Dec 2011
              • 98
              #4
              Re: Sanyo p50747-04 shuts off after a few seconds, but has pic...

              Yes vs is fine. I have all my voltages. Screen pattern is perfect from logic board and will stay on for test so i know its the main board. I disconnected power button board after turn on and it still does the same... service manual says to check power failure circuit but cant locate but one IC in the circuit. IC 1610. Cant locate ic1620, 1630 or 1640. The service manual is in the attachment in my first post with layout of board in there also front and back

                Comment

                Previous template Next

                Related Topics

                Collapse
                • howardc64
                  A1312 (27” iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                  by howardc64
                  Problem

                  This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                  08-04-2024, 10:36 PM
                • howardc64
                  TCL 55S425 few horizontal lines, potential failure on both side of panel/buffer board
                  by howardc64
                  All left and right refers to looking from rear of TV (or looking from front with TV upside down)
                  • TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
                  • Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
                  ...
                  07-24-2025, 05:17 PM
                • riko 656
                  Lenovo Legion Slim 5 16APH8 (RTX 4070) - Turns on for a few seconds then shuts off. BIOS issue.
                  by riko 656
                  Hello everyone,
                  I need help with my Lenovo Legion laptop. It turns on for a few seconds and then immediately shuts down. I believe this is a BIOS corruption issue.
                  Laptop Model:
                  • Model: Lenovo Legion Slim 5 16APH8
                  • GPU: NVIDIA GeForce RTX 4070
                  • Main BIOS chip size: 32MB
                  • VBIOS chip size: 16MB
                  Problem Description: The laptop was working perfectly. Now, when I press the power button, the keyboard lights up and the laptop powers on for just a few seconds, then it shuts itself off completely. After researching, I am convinced it's a corrupt BIOS.
                  What I Have Tried So Far:
                  1. I
                  ...
                  11-04-2025, 05:14 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...
                  ORIGINAL POWER SUPPLY BOARD
                  7 Photos
                  11-22-2024, 01:46 PM
                • alltvrepairs
                  Plasma Samsung PS-50C96HD Main board BN94-01223C switches off supply after few seconds
                  by alltvrepairs
                  Hi,
                  I have this almost brand new Plasma was well stored. I would like to repair it for a friend of mine.

                  I have noticed that it works for few seconds then switches Off the Power_ On signal. Have disconnected boards and left maion board and power supply and still the same. The power supply with PS_ON and VA signals On stays on so it is not a problem in the power supply.
                  Any one met this problem in the past?...
                  10-08-2025, 07:34 AM
                • Loading...
                • No more items.
                Working...