CNX Nano2 - How To Fix Flashing LNBF On DisplayLNBF Error usually means blown Tip42C Transistor.

Here is how to test and fix the problem.

First check for Voltage at sat in connection.

Need a voltmeter set at DC Volts.

Connect a short piece of coax to the Sat IN connector and check for
voltage between centre copper and the screw connector.

With receiver ON you should be getting voltages switching between
13V-18V DC when changing between Vertical and horizontal TP's.

If no voltage present or only 20V present then most likely you have a blown
Tip42c or KA317 transistor.

These unit switches the voltages to your LNB 13V and 18V.

18V = Horizontal TP's
13V = Vertical TP's

When they fails you will either get No Voltage showing at your Sat In
connector or it will lock at 20Volts and not switch to 13V.

If it is locked at 20Volts you will only be able to get Horizontal TP's on your STB

If it is locked at 13V then you will only receive Vertical TP's.

If no voltage present then you will get No Signal Message.

Take the top off your box look on circuit board for a little black transistor
(it has metal top with hole, the heat sink, and three pins on bottom)
located about one inch in front of where you hook sat wire.

It could or could not be attached to an aluminum heatsink.

Make sure you get right one, part Tip42c or in the case of Viewsat, CNX
and Sonicview KA317.

The Tip42C is located directly in front of the shiny box that your sat in
coax connects to.

It is Black and plastic with metal extending above it with a hole in metal
and has 3 legs which are soldered to the board,

Tip42C or KA317 is printed on the black plastic face.

Viewsat ultra's,Sonicview and CNX Receivers use the Fairchild KA317
Transistor and it is Mounted to a Heatsink

If the KA 317 goes bad on a CNX Receiver you will get LNB F error on the display.

Take note of the way it is oriented, if mounted backwards it will not work.

If you are getting NO Signal Message and have No Voltage at your Sat In
Connector Hook up sat wire and take a small screwdriver and touch first
two pins toward back of box together.

If you get a signal, then this transistor is bad and should be replaced.

NTE332 transistor is a direct replacement if you can't find the Tip42C.

Tip42A or Tip42B will not work.

Cost on these is under $2.

It has to be Tip42C or NTE332 or in the case of the Viewsat, CNX and
Sonicview--- Fairchild KA317

Replacement for Fairchild KA317 is Fairchild LM317T.

The NTE332 is about $5 but are more robust and worth the extra $.

Available at most decent electronics stores.

To replace make sure you take note of the way it is oriented, Unscrew from
heat sink if one is present, pull out your main board,from the bottom
desolder the 3 legs using solder wick or solder sucker, insert new transistor
and resolder, Connect heat sink if one was used originally.

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Please don't PM me with fta related questions, ask them in open forums so others can benefit from them too.

this guide is intended to help members who have ruled out that its a short in their system
To do this you need to power off unit then unplug sat cable Power back on.If the issue does not happen again you have a short and you should check your cabling especially frayed ends ,water damage etc