I have a un75f7100axza ,, there r 3 boards on the back trying to figure out which one is the one that controls the lights, everything works but the picture, if u do the flash light,its do n that

If you see an image with a flashlight the T con board and power supply board are good. The back light controller board is the culprit.

1) You must check the flexible cord between display board vs controller motor board, and tight very well

2) Try to access to the keypanel and clean with special spray (clean contact you can find in radio schack or computer store).

3) Try to Measure the +5Vdc for I.C. including EPROM, ROM, etc.

4) And try again.

5) Measure if the power supply to display is coming out from the Lower board or Motor controller board. If not the Motor controller is faulty. You must replace it.

Use Dvoltmeter.

Remember 90% aprx the Motor controller board access to the function in the display board, elevation motor, power input, etc.

sincerely.

I fixed my 3 blinking issue: I pulled off the small blower motor above the vacuum sensor and spun the fan with my finger. It had resistance at first but then it spun freely. I put everything back together and it ran. I figure next year I may have to buy a new motor, but I made it this year. By the way that fan creates the vacuum to allow the sensor to work. It is a safety thing I figure. If the fan seizes up again the unit will sense it and shut down.

did you try shopjimmy.com?

The relay for the lights is not working. No board level repairs. You will have to replace the control board to get this feature back.
Eric

I am having the same problem. By all indications it looks like the motor controller is the problem. Everything else works OK. I am pulling the controller tomorrow and replacing. If that doesn't work I am junking it.

You need to replace the electrical control board. It's an easy fix. About $75 for the part. No electrical work necessary. Just unclipping and re-clipping wires into their ports. You do not need a repairman to do this! (I'm a 33 yr. old female, so please forgive my lack of technical terms in the post) I ordered one from AppliancePartsPros.com. It came in two days.

1. Pull out and UNPLUG the fridge.
2. Take out the screws that hold the bottom back panel on
(The electrical contol panel is located inside a white box attached to the lower left corner. )
3. Remove the screws that hold the box in place
5. Remove the bunch of wires out of the clip on the side of the box and pull the box out. Open it by releasing the clips on either side.
6. Disconnect the three sections of wires that plug into the board
7. Remove old board out of the housing
8. Insert new board,
9. Reverse above steps to complete installation.

Note: What triggers the buzzing sound is the door being opened. If you want to stop the sound and prevent the electrical current from going to the fried board until your new one comes, put a piece of tape tightly over the switch that pops out when the door is opened (located inside the unit near the door hinge).

The 016-317 on this printer refers to the printer not being able to communicate with the MCU board. This is what you should do. This was pulled from support.dell.com. Which is the same troubleshooting trees as the phone/internet agents use. If this doesn't solve your issue, you will more than likely need to update the firmware of the printer, or replace the board. STEP: Reseat the controller card on the 5100cn-series printer.
Additional Information CAUTION: Before you perform any of the following steps, read the Precautionary Measures warning (located in the Resources/Additional Resources section) for your personal safety and to prevent damage to the computer system from electrostatic discharge.
To reseat the controller card, perform the following steps:

1. Make sure that the printer is turned off and unplug all cables including the power cord from the rear of the printer.
2. Pull the tray rear cover so that the top edge tilts out, then lift the tray rear cover off its hinges. (Figure 1)
   
   
   
   Figure 1 - Remove the Tray Rear Cover
   
   
3. Remove the three screws on the control board from the back side of the printer. (Figure 2)
   
   
   
   Figure 2 - Remove the Three Screws
   
   
4. Remove and reinsert the controller card from the printer by the handles. (Figure 3)
   
   
   
   Figure 3 - Reseat the Controller Card
   
   
5. Tighten the three screws on the control board on the back side of the printer.
6. Reattach the tray rear cover to the back of the printer.

If your controller is not assigned a position, and pressing the sync buttons on both the console and the controller don't fix it (i.e. they both spin for a bit, but then the console's lights turn off and the controller's return to a pulsing pattern), the the problem is actually likely to be your TV, believe it or not. The issue is HDMI -- it's a secure connection between the Xbox 360 and the TV, and if there's an issue with that connection, the Xbox won't even be able to turn on since it'll be unaware of the TV's resolution, color capabilities, etc. Try turning off the TV and then turning off the Xbox. Keep the TV off and turn the Xbox console back on. You'll see the same behavior; but now turn the TV back on and you should see the controller get assigned a position. As soon as the Xbox is aware of what it's connected to via HDMI, things start to work again.

replace the power control board