Double din car stereo freezes with GPS use

[caphair]

Model # fba-2531gnn

This is a friend's and the problem is the entire unit freezes and becomes inoperable only when the external gps antenna is installed.

Would this be an antenna fault or gps circuit? Connected to an adjustable power supply the current draw jumps up when the antenna is installed compared to normal draw when it's not

[redwire]

Re: Double din car stereo freezes with GPS use

There's three different kinds of car GPS "antennas":

1. RF antenna only, coax feed to GPS receiver in double DIN.
2. Active antenna, 2 or 3 wires, its an antenna with built in amplifier.
3. Integrated module with GPS antenna and receiver. These output TTL serial data and usually take 5V power in; 3 wires. Most popular.

Water can get in and short out #2,#3.

What does the double DIN connect to?

I would say the power may be loaded down, GPS takes 100-200mA roughly.
Or the GPS receiver has corrupt configuration. Default is usually 4800,N,8,1 with NMEA format. You can connect a PC and terminal with level shifter and see the data stream.
If the baud rate is bad, garbled data may crash the double DIN.
Some GPS settings are stored in the receiver's EEPROM, or NVRAM. There is sometimes a little coin battery to keep the ephemeris saved for faster sat. lock.

[caphair]

Re: Double din car stereo freezes with GPS use

It's a coax style antenna. Can they fail causing the freeze up or it would be internal to the radio

[redwire]

Re: Double din car stereo freezes with GPS use

Can't see an ordinary RF antenna problem crashing a radio.
I think only an active antenna can use coax and be able to crash the double din radio. Check for a short on the antenna coax or see what voltage the radio has on the connector before you plug in the antenna. Looks like the antenna to me.

An active antenna has a built in preamp yet only two wires: GND and combined signal+power. Something called a "bias-tee" separates the RF signal and power, inside the receiver.

[caphair]

Re: Double din car stereo freezes with GPS use

I measure 0 ohms from center terminal to outside. Does that mean it's shorted?

[caphair]

Touchscreen not working on double din car radio - service manual?

Model # fba-2531gnn

Can't find service manual or schematics. Trying to troubleshoot touch issue not responding

[petehall347]

Re: Double din car stereo freezes with GPS use

just above the plug is your problem .the wire has been trapped

[redwire]

Re: Double din car stereo freezes with GPS use

Yes that coax is crushed! slammed in the trunk. Active antenna should not read zero ohms. If the antenna comes apart, maybe cut off damaged piece and solder back onto the PCB.
It is possible to put GPS antenna inside the car, under the dash or rear deck.

[caphair]

Re: Double din car stereo freezes with GPS use

Thanks guys

It's having touch issues. Started another thread about it if you have any idea for troubleshooting: https://www.badcaps.net/forum/showth...385#post738385

[Hellfiya]

Re: Double din car stereo freezes with GPS use

Thanks guys

It's having touch issues. Started another thread about it if you have any idea for troubleshooting: https://www.badcaps.net/forum/showth...385#post738385

It seems that your link redirects to this post, at least for me

[caphair]

Re: Double din car stereo freezes with GPS use

It appears maybe a moderator merged that thread into this one. It's now shown in post #6

Question on the antenna. Can I use an universal replacment? Can't find any specs on this one, can't open the model to attempt soldering the wire. Found this on eBay:

https://www.ebay.com/itm/222187342951

[petehall347]

Re: Double din car stereo freezes with GPS use

i would cut the wire beyond the squashed bit and see if it still looks shorted .. then maybe do a tidy fix with a new plug and socket