Question about LG Televison & Video

Open Question

Model- Lg tv - RD-14CA30M Retresh With Picture But Video output Ic Is OK,Main IC iS Ok But?????? Please Solve This Problem.

Posted by on


3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


SOURCE: Half part is display

replace ic

Posted on Sep 29, 2008


SOURCE: Grundig tv Davio T51-3101 TOP.

You either have a Faulty Horizontal Oscillator IC? OR something, on that 1.3 V Output, is dragging that output down and on that output, something drawing too much current, and causing the IC, to not be able to drive to it's full potential, usually 5 V DC in a logic circuit, but if CMOS, then even 12 V DC.
All one can really do, is find the "Cause" of the low output, remove the "Fault" and/or change the IC, too (It's most likely damaged anyway? So I usually do)

You need to get the parameters of the IC & Semi's that you are working with and check the output against what it should be.
Also, you did not indicate if you were using a service manual. If not, then I implore you to obtain one, as without it, one really cannot work effectively.
As I always used to say to my students: Are Your Voltage Correct? Specifically, starting with the PSU, as if this isn't 100%, nothing else can be. Anyway check all voltages around your IC's & Semi's. Also remember the technique of "Cut & Test" too, isolating parts of the suspected circuits, by cutting a trace, or chopping a Leg or Pin, on a Semi or IC, can be useful in tracing where the fault is going. One other thing is Current Measurement, cutting into a circuit, and inserting the Ma meter, into the circuit, will also soon show you where the problem is, reduced current usually indicates a "Short", a high current usually show a disconnection, or "Open" circuit.
Hope this helps.

Posted on Aug 27, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Why come white vertical line on my t.v screen in center?

You said "I checked vertical output line from main ic pin 23 found correct"

But the problem is "Horizontal Output Line" Try that.

Jan 29, 2015 | LG Televison & Video


No sound, video OK in TVs


There are some occations arise when picture in a TV will be OK while absensce of sound.
Picure is OK, means that, functions from tuner upto video output, including power supply are OK. In most cases absence of sound may be with the fault to its speaker or speakers. In some sets there will be two speakers connected in series connection, and its sound output will be MONO. In these type of sets, if the connction is done as above, even one speaker has gone out [that is its voice coil or its connection gets opened, both speakers will not work]. In this case, you have to check each speakers individually for coil conitnuity, and the faulty one must be replaced. If there is no fault to the audio amplifier section of that TV, the problem will be solved with this.
In stereo sound system TVs, two of its speakers will have individual amplifiers, some may have both amps sections are integrated in one IC or two ICs are used seperately for each channel. In this type of sets, absenece of sound can be either to the fault of the failure audio output IC or its supply line voltage. In most cases, you can make sure the reason with a simple test without opening the set. Place your ear very close to its speaker side, and switch ON the set by its front panel power control switch. if a "Thumb' sound is heard form the speaker, you can confirm that the speaker is OK, and the power supply is comming to the output IC. If so, check the output IC terminal solderings for some loose contact. During long run, this may happen because, the Audio Output IC will heat up during working, and repeated heating and cooling may make loose soldering at its terminals; or a loose fixation of the IC to its metal heatsink, will relult overheating the IC. In most cases this is found a common fault. To rectify this, you have to open your TV, and pull out the audio output card, in some sets, this audio output section swill be built on the main board itself, place it upside down, and resolder all the terminals of the output IC by applying a little more solder, without making any solder bridges in between terminals of the IC. If this also doesn't help you, check the input voltage of the audio output IC. In most sets there will be a fuse resistor used as protection, will be in 0.2Ohms in value, and will get opend thus disconnect the supply; if IC has some fault. This will happen when the output IC itsef get shorted. If you see this resistor opend, check the output ICs positive supply rail terminal to the negative terminals' resistance with the help of an Ohm meter, if foud very low, say between 0 Ohms and 5 Ohms, make sure that the IC has got damaged. Here you have to repalce the IC and this fuse resistor too.
When replacing the audio output IC, make sure to apply thermal conductive paste, in between IC and it heat sink. This conductive paste can be bought from most of the electronic spare part selling shops at your town.
There is an other possibility too, is, the audio filtering stage in the video IF stage get faulty. To detect this, you have to go to the VIF section, and it is a skilled job, and the worker must have sound knoledge in electronics, and service experience.

on Mar 21, 2011 | Televison & Video

1 Answer

Tda 9370

Check the video output RGB out terminals of the TDA9370. Check the voltages. If can, check signal waveform. You have't specified nothing about the audio status. If you wish to get the schematic of TVs, using TDA9370, check the site linked here. Never confirm that the IC is OK. Check the serial data & serial clock. Replace the main system control memory IC, too. Pull up previous posts there, either by type in the model name to your set in its search box, or view it in Mosaic /Timeslide option.

Jul 21, 2013 | Televison & Video

1 Answer

No picture. Sound is OK on Philips DPTV345 model 51PW9303/17F

I would check the solder on the Vertical output IC as ofetn the soolder will crack and the CRts will shut down to prevent damageing the CRts when vertical drops out. If the solder looks good I would try replaceing the vertical IC very inexpensive and you can get the vertical IC from

Feb 10, 2013 | Televison & Video

1 Answer

Im not sure if vertical output transistors is the prob, but my tv has picture only in the middle vetically, i change the capacitor and ic, but still it didnt work out, pls help.

Your assumtion is currect. But the vertical output section of this TV has no transistors at all. It is composed of an IC. Check the soldering terminal connection of this IC legs for any loose soldering first. Just resolder all the solder terminals of this IC by applying a little more solder. In most cases this will solve the fault. If not, check all the surrounding electrolytic capacitors to this IC circuit. If found suspected, replace them. Still fault perists, replace the vertical output IC with same type and number.OK.

Aug 03, 2011 | Toshiba 32A50 32" TV

1 Answer

No video output on my supra lcd 42, audio is ok

Its input-output selector switching IC is faulty. this IC, an electronic switching device, that switches the internal and external audio vidw in-out and is controlled be main system control IC. When we select the function to internal or external, the signals goes through this IC according to the control pulsed generated by the main system control IC, with our command. In your set, the video section of this switching IC is OK, but audio switching section has damaged. It wont switches the video to out, but alright in case of internal video switching. So you can see picture either with AV of by air transmissions, but there will be no audio with AV.
Replace the IC is the only remedy to rectify this problem. It is really a skilled work, and you must have through knoledge in digital electroncis to do this work. It is besf for you to get it repaired by any experienced service technician. The IC won't cost more; and can be bought from most of the electonic sparepart shops at your town. OK.

Jul 15, 2011 | Televison & Video

1 Answer

Thin horizontal line across screen

You haven't specifed nothing about the model number or brand name of your flat panel teleivison. i assumes that it to be a picture tube based one and posts this solution before you.
A thin horizontal line across the screen with sound output is OK, is the sympton of total failure of vertical sweep. This may be due to failure of vertical output IC or loose solder terminals of that IC. The vertical output IC will heat up while working, and repeated heating and cooling may make its solder terminals to get loose. Just open your TV, pull out the board that contains vertcial output section, turn it upside down, resolder all the solder terminals of that IC by applying a little more solder, without making any solder bridge in between terminals. Check the voltage to the vertical output IC also. If this resoldering method does not help you, replace the vertical IC itself with same type and number will solve your TVs problem. OK.

May 07, 2011 | Televison & Video

1 Answer

When I turn on tv,it shows a white screen and don't anything do

You haven't specified anything about your TVs sound condition. If the sound is there and only the picture is out, leaving a white screen behind, it is due to the R-G-B output section of your TV. The section mentioned above comes on the picture tube base card, a circuit board connected on the neck of the picture tube, directly pluged onto it, with the help of a socket called picture tube base socket. You just measure the voltage to it first. The main voltage comes to it from the secondary voltage winding from the line output transformer, [LOT], generally, or from the SMPS power supply itself. It will come upto 260VDC, and must be there. If this voltage is missing, the fault you mentioned will occur. If this voltage is there, the fault may be due to a decective video output section. It may be built in with transistors, or an integrated circuit [IC].
Usually, Samsung uses Philips IC, number [TDA 6007B], or its equivalent in this stage. Check for any loose, or bad soldering on the terminals of this IC. I advice you to resolder all the pins of this Ic, by applying a little more soder, without making any short circuit bridges in between them. zin most cases, this will solve the problem. If it doesn't help, replace the IC with an identical in type and number.
If you wants anymore asistance, feel free to get me through Fixya. OK.

Dec 20, 2010 | Samsung CSN2077 20 in. TV/DVD Combo

1 Answer

The stand has been taken off need to put back on LT 3050


Aug 20, 2010 | Mitsubishi LT-3050 30 in. HDTV LCD...

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

204 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Televison & Video Experts

Computer Repairing
Computer Repairing

Level 3 Expert

14641 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

The Knight
The Knight

Level 3 Expert

74377 Answers

Are you a LG Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides