Question about Toshiba Satellite A215-S5818 Notebook

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Power to board, no lights, will not power up.

Power to main board, no lights, will not power up. Power from power supply is 19+ VDC, fuses on motherboard (2) check good.

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I have same problem

Posted on Feb 06, 2010

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6ya6ya
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Posted on Jan 02, 2017

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I have LG 42LN5300 which is reading 230VDC at led + plug and no back lights. All other voltages going to main board are OK, I changed main board because of flickering on and off screen, so is it MB


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Jan 20, 2017 | LG Televison & Video

1 Answer

Power board, no backlight supply 93.2-118.5 vdc


To turn on the back light supply line, a command voltage should arrive to power supply board, from the main board. Here it do not comes; and that is why the back-light is off. So; the main board should he checked. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Aug 03, 2015 | Televison & Video

1 Answer

I HAVE A JENNAIR JS42CSDBDA FRIDGE THAT WENT DEAD NO POWER,NO LIGHTS CHECKED OUTLET AND FOUND POWER GOING TO FRIDGE BUT NOTHING. IT ACTS AS IF IT'S NOT EVEN PLUGGED IN.


No one turned off your power switch up above the refrigerator, I trust. So, either your power supply or your main PCB is blown. Check the fuse on the main PCB (up on top of your refrigerator in the compressor area). The fuse will be right next to that round, black piezo electric speaker on the main PCB board as shown here:


52f3d145-54c2-4885-b0b7-dceebc8d9c83.jpg
If that's not it, then check to see if your power supply board is supplying power by measuring the voltage on JP11 of the Main PCB. You should see 26 vdc between pin 3 (GND) and pin 1. And, you should see 12 vdc between pin 3 (GND) and pin 2.

If you don't get those voltages, then you might have a bad Power Supply Board. It looks like this:

73a3b2de-febc-4413-9ad4-529414e074c1.jpg
Also of note, your 120vac going into the Main PCB board comes in on JP8, pin 1 (WHT) and pin 5 (RED).

I don't know if you will be able to see the larger image of the schematic, or if Fixya will just give you a thumbnail, but I'll try to post it here, anyway:

b028f564-3f79-41e6-b61e-1de07345fc54.png

Well, good luck and let me know if you need any more assistance.

Oct 20, 2014 | Jenn-Air Refrigerators

1 Answer

Have an Acer Aspire 5920G that is dead. The power supply seems OK with the green light on and ~19 VDC on the DVM when checked. no power light on computer when plugged in, with or without battery.


Hi,

It is possible that there is a problem with the connection from your power supply going to the main board of your laptop.
This is rather a technical problem and my best recommendation is to bring your laptop to a technician and have them check it.

Hope it helps!

Thanks!

Feb 02, 2011 | Acer Aspire 5920-6727 Notebook

2 Answers

42" Vizio Power supply board output voltage?


The next thing I would check out is the power supply for the screen. Most manufactures call it a Backlight Inverter Board. If a part does go bad on this board, it would also cause the stand by mode or protection mode.

Jul 30, 2009 | Vizio L32 32 in. LCD HDTV

2 Answers

Same problem. red light flashes 3 times, but will not turn on.


Hi,

The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online. If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
  4. Check for +22 VDC out of regulator on page [3] out of Q822 Emitter
  5. Check P809B connector for :
  • P809B (12) POWER = 3.00 VDC (+/-0.2)
  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
  1. Check for PFC_OUT = 368-371 VDC
  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

Good luck,

mrwindex

Jul 03, 2009 | Toshiba 42HL196 42 in. LCD HDTV

1 Answer

Pin Name Color Description


Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

Apr 01, 2009 | HP Compaq dc7100 PC Desktop

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