NOTE: Please note down the default values before changing them, so that you can restore them if something goes wrong or you don't like the output.
All digital TVs contain a secret service code which allows you to change some internal settings like picture height, width, position, colors, etc. Basically this service menu is used by TV mechanics.
Here we are sharing service codes for LG and Sony TVs.
For Sony TV:
First power off your TV using remote, then Press <Display> + 5 + Vol Up + Power button simultaneously on remote.

Now you can make desired changes to the settings.
To save the changes, just press Mute + 0.
For LG TV:
Press and Hold <OK> button on remote as well as TV panel at the same time for a few seconds.

For some TV models, you'll need to press "Menu" button on remote and TV panel simultaneously for a few seconds.
Now you can make desired changes to the settings.
To save the changes press <OK> in Remote.
PS: Be very careful while playing with the service menu. First make changes but don't apply them. If something goes wrong, just switch off the TV and switch on it again.
This article was posted by VG in following section: Mobile Phones.
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VG
^^ If the TV model cant recognize the firmware, you should not use it for the upgrade. I'm afraid it can create problems for you.
sureshrajan
i have lg tv model number-21fx4age
but av1 and av2 display not display the picture and sound.but tv tuner is working
please help me
Chan
Dear VG and all advance - gadget power users
I read in some posts in relevance of installation menu ( In-start, in-stop, etc) is to be activated by third-party softwares (+)hardwares; such as: IR remotes (specific brands in the US /and EU), IR enabled smart-phones and such..
Is there any easier route to tweaking installation menu by just using the supplied remote ( with just a smart, hidden codes or procedures)... cos I have tried to no avail, yet to try the rs232 port trick..
cos so far I have been able to enter upgrade menu by pressing 7(7x) whilst highlighting OPTION after hitting menu (home) button on my LG 22LK311 lcd tv
if upgrade is possible... via any possible means
w/o sacrificing original settings (via humble backup on USB stick), or simple factory resets in case of uneventful crash or unsuccessful up/downgrades..
surely there's one just haven't found it yet..
Anyone's been there? please share..
I just need to unlock DivX to HD or HD+, cos I wanna play mkv files which currently isn't allowed in SD realms.. ( I'm stuck w/ it, but I believe it's just a matter of tweaking option, cos the 32" model can play HD)
Thanks and much gratitudes in advance...
Chan
chambula kelvin
i was repair 29 lg TV which has the problem of power dropping to secondary side. but after repair it .but it shows the pin cation on screen .so what is the secret code for 29 inch model 29f07rg5.Tl? so that i can sot out this problem?
Anand
My tv is problem in noise Plz give secret code for thamilaga arasu vannatholaikatchi
Abdurahim mohammed
These good tankyou
vinay
i am having difficulty in opening service mode for sony wega kv-sw14m80 tv.i tried d display+5+vol up+power
thanks
COMPLIMENTS OF THE NEW YEAR
James
I hv an LG32Ld350 LCD how do I get to the service menu
reza
hi my dear
i have need "Hidden Secret Service Codes for Sony klv-z550 lcd TV"
if possible send me.
best regard.
bye
billz
i have tryed this code + 5 + Vol Up + Power button on my sony kdl-32v4730 model...the tv opens and the sevice menu goes up for about half a sec and then dissapears to normal tv...:|