12v TV issues

Oct 21, 2019
22
15
North Shields
Funster No
65,922
MH
Coachbuilt
Exp
Newbie
Hoping someone with experience can help me.

I have a new 12v smart TV and also brand new leisure batteries x2 with solar.

The TV works perfect on 12v if we are on ehu or the engine is running.
At night with no ehu it flickers and cuts off.

If I put the inverter on and plug it into a 3 pin socket it works fine but this appears to hammer the batteries.

Is my TV faulty?

Thanks
 

Gellyneck

LIFE MEMBER
Jun 5, 2014
4,274
4,447
Scotland
Funster No
31,836
MH
C Class
Exp
More than toes wet now!
I would guess at there's nothing wrong with the TV but the supply of power to it. Is your issue with the batteries?
 
Nov 4, 2011
2,301
3,163
Uk
Funster No
18,763
MH
A class
Exp
2001
Could it be voltage drop,I had this problem. I fitted heavier gauge wire.

Subscribers  do not see these advertisements

 
Jan 29, 2017
307
150
Gloucestershire
Funster No
47,109
MH
Lunar Chanp Coachbuilt
Exp
10yrs
Is the tv actually designed to run off 12v? are you connecting via a voltage stabiliser? These will take in battery voltage and send out 12v almost independent of battery state. if you are just taking the raw dc from the motorhome then it sounds as if as soon as the battery voltage starts to fall below say 12.8, then the tv starts to shutdown.
The invertor will have greater losses as it will take 12v dc up to 240 ac then the tv brings it back down to what it like, hence the greater load on the batteries.
Whats the make and model of the tv, was it supplied specially for mh use?

Mike

Subscribers  do not see these advertisements

 
Jan 29, 2017
307
150
Gloucestershire
Funster No
47,109
MH
Lunar Chanp Coachbuilt
Exp
10yrs
Being on ehu will raise the dc voltage to about 13.8 and sustain the tv ( same as running the engine)

Some tv's do not like 13.8v hence the stabiliser,
Mike
 

pappajohn

LIFE MEMBER
Aug 26, 2007
37,558
27,436
Dark side of the moon
Funster No
172
Exp
Since 2005
Check the output voltage stated on the mains adaptor then check the actual voltage (off hookup) using a meter at the socket.
If the socket is less than the output voltage stated on the mains adaptor that's your problem.
 
May 7, 2016
2,087
1,769
Poole, Dorset
Funster No
42,951
MH
Carthago Compactline
Exp
Since 2003
A voltage reading at the TV when it starts to misbehave would be my starting point.

Subscribers  do not see these advertisements

 
Apr 6, 2019
589
550
Peterborough
Funster No
59,702
MH
C Class?
Exp
1999 Autocruise Impala, bought 2019
First thing to try (after checking wiring and the actual voltage at the socket in your MH) is to CUT OFF the usually very cheap and nasty 12V plug you have from the TV - I am assuming you have a cigarette lighter style plug on the TV?
I had a brand new TV that was intermittant but finally discovered the wiring inside the 12V supplied plug was very poor. Bought a replacement and fitted nice and securely - no drop out since (apart from when water pump runs, it flickers but not enough to turn off TV).

e.g.....

12V socket with it's own switch

Subscribers  do not see these advertisements

 
OP
BigBetty
Oct 21, 2019
22
15
North Shields
Funster No
65,922
MH
Coachbuilt
Exp
Newbie
Thanks for all the responses
Tv was recomended in a thread on here.
Sharp 24" Smart LED TV DVD Caravan Truck Freeview Play Satellite Saorview PVR

I am plugging it into the factory fitted 12v cig lighter style socket. It reaches 2 other 12v sockets so tried it in all 3 and it behaves the same.

Re the voltage stabilizer I don't know what one is but assume if it's needed then CL will have fitted it?

I initially thought it was a bad connection in the plug or socket but it is always fine when driving which would be the worst time if there was a loose connection. I will check the voltage at the socket with no ehu.

If it is low what would be the possible fix / next step?

Thanks
 
Jan 29, 2017
307
150
Gloucestershire
Funster No
47,109
MH
Lunar Chanp Coachbuilt
Exp
10yrs
Looking up what you have said you have it refers to a 12/24v charger adapter.

"Box contents - Sharp LC-24DHG6132KFM 24" TV with Built-in DVD Player - Feet with screws - Remote control - Batteries - Quick start guide - Manual - 12V / 24V Adapter (in car charger) - UK 3 Pin Plug - "

This could be faulty, also it states that it draws 25watts ie 2 amps. I would begin to wonder if its voltage drop in the wiring to the sockets. Easiest way to check is with a voltmeter into an adjacent 12v socket and see what it is giving you when the tv is on then turn off the ehu and watch it drop.
I wonder did any previous tv work ok?
Mike
 
OP
BigBetty
Oct 21, 2019
22
15
North Shields
Funster No
65,922
MH
Coachbuilt
Exp
Newbie
Looking up what you have said you have it refers to a 12/24v charger adapter.

"Box contents - Sharp LC-24DHG6132KFM 24" TV with Built-in DVD Player - Feet with screws - Remote control - Batteries - Quick start guide - Manual - 12V / 24V Adapter (in car charger) - UK 3 Pin Plug - "

This could be faulty, also it states that it draws 25watts ie 2 amps. I would begin to wonder if its voltage drop in the wiring to the sockets. Easiest way to check is with a voltmeter into an adjacent 12v socket and see what it is giving you when the tv is on then turn off the ehu and watch it drop.
I wonder did any previous tv work ok?
Mike
Thanks Mike it's in storage for a few weeks while my drive gets done. Will try this when I get it back on the drive. There was crap little tv in it when we got it. It did work on our first trip yes but not for long as the leisure batteries were past it. I replaced them and fitted the new TV at same time.

Subscribers  do not see these advertisements

 
Nov 4, 2011
2,301
3,163
Uk
Funster No
18,763
MH
A class
Exp
2001
Thanks which wire did you replace? From the battery to the 12v socket?

Would being on charge stop the voltage drop issue?
I had put a 12volt twin socket in and found the wire I had used was not big enough.
mine worked ok on EHU.
 
Jan 29, 2017
307
150
Gloucestershire
Funster No
47,109
MH
Lunar Chanp Coachbuilt
Exp
10yrs
Thats the clue, it was a small tv before, you are drawing more current and the extra load on the wiring is causing the voltage drop.
I would also look at the wiring and the performance of the "new" leisure batteries as well
A simple voltmeter is a very useful tool.
Pity you are so far away
Mike
 
OP
BigBetty
Oct 21, 2019
22
15
North Shields
Funster No
65,922
MH
Coachbuilt
Exp
Newbie
Thats the clue, it was a small tv before, you are drawing more current and the extra load on the wiring is causing the voltage drop.
I would also look at the wiring and the performance of the "new" leisure batteries as well
A simple voltmeter is a very useful tool.
Pity you are so far away
Mike
Thanks Mike. I have a volt meter. When I get her back on the drive I'll post up my findings cheers

Subscribers  do not see these advertisements

 
Funster Discounted tickets to the NEC Show
Rhino Installs
Johns Cross
SMC Motorhomes Newark
Friendly professional service from qualified technicians
Safeguard Motorhome Insurance
Top