The damage Horizontal LG TV

Often find LG TV is switched off completely. After checking it Hor short TR / koslet so that all the inverter output voltage drop. Start with the appointment of TR page and check the voltage and turns back to normal. Do not always replace with a new TR because TR surely you will lose because they will surely be broken again, if immediate profits and normal life. After checking on the block capacitor Horizontal out that there was a rather plump and lifted it after it is dry there is no value of the capacitance.

LG TV

Capacitor is located on the collector TR Hor bypassed to ground which is parallel with the diode. For the slim LG 21 "inch typically use 2kV 183j (18n 2kV) for the black pearl 29" using 103j2kv (10N 2kV). After replacement of capacitor TSB and TR Hor who just started a TV and Direct TV was OK. ve Also found a balck pearl TV LG 29 "wide image conditions and so OSD is only half visible. As usual checks are still in the horizontal section. Initially thought to drive the FET TR Hor damaged and wide after being picked and measured FET turns out they will be still good. And start There seem damaged parts elco 250v1uf which already began to get puffy and after replacement image remains the same.

And start looking again whats so broken, and who seemed to actually see the disease as I get 600V 154J capacitor looks a little plump. C they will begin to lift and measure it with tester tester x100K and was not moving at all a sign of C is dry. They will begin to replace the capacitor, because it does not have the same C 204J 250V only that there had to be replaced eventually with this one. Begin with a TV and the picture was no longer visible widening is normally only about the width of the CM because it is not the same capacitor.

Then enter the service menu by pressing MENU on the panel and press 2 times hold MENU on the remote and add value HOR WIDE to fit the image width and by pressing OK on the remote to save the settings and press AV to exit.

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Power amplifier compatible with TV audio

In this amplifier circuit using IC TDA8944J as the main amplifier with dual-channel audio amplifier with 2 x 7W output power at 8 Ω impedance. And a minimum supply voltage of 9-18 Volts. In this ic contains two Bridge Tied Load or BTL amplifier.

The circuit is often found in audio amplifier in a series of television, besides TDA2003, TDA2006 and so forth. PCB for a series of amplifiers using IC TDA8944J is very compatible with all other types of IC in IC TDA894X family unit , and below is a schematics.

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Different types of TV TUNER

TV tuner that is used on older models and new models of television there are some differences. Therefore, understanding the different types of tuner would be useful if we want to replace the tuner with the other models.

Supply voltage tuner.

Tuner older models generally use a supply voltage of 12v, the new models are commonly used 5V supply voltage. Some use a 9V voltage, but very rare.

TV TUNER

Voltage Synthesizer tuner (VS tuner)

Tuner that uses a tuning control (VT or BT) with a voltage between 0 to 33V Voltage Synthesizer tuner named. TV can be found on the aircraft models, old and new

Based on how the control band-switch, Tuner VS then there are 2 kinds, namely

Using 3-Band input sw, the VL-VH-U

Using 2-Band input sw, the Band SW1 and SW2 Band. This tuner is actually similar to the type of band 3-sw. For control-sw 2 band is in the tuner will still be converted into 3-sw bands.

Frequency Synthesizer tuner (FS tuner) or the type of PLL

Tuner wherein the tuning voltage and the voltage controlled band switching the digital communication through SDA and SCL. This tuner has a supply voltage Vcc, which is

5V is used for the digital tuner circuit control and

33V (fixed voltage or fixed) is used to control the voltage supplied to the tuning in the digital circuits within the tuner.

(Tuner old) sometimes there are additional circuit voltage of 12V to the tuner.

Frequency band.

Based on the wide range of revenue-frequency band, there are three kinds of tuner

Normal tuner

Superband tuner

Tuner hyperband

Normal tuner, the tuner that can receive broadcasts "on-air" (terrestrial) TV in the frequency band:

• Frequency of VHF Band I - VL 41-68 Mhz
• Band III - VH 174-230 Mhz
• Frequency UHF Band IV - U 470-581 Mhz
• Band V - U 582-960 Mhz
• Band II 87.5 - 104 MHz is used for FM radio broadcasting
• VL and VH bands used for broadcast channels 2 through 12
• U bands used for broadcast channels 21 to 69

Superband Tuner and Hyperband, the tuner can receive broadcast as normal tuner plus the ability to receive broadcasts "off air" CATV (cable television).

• S band using frequency band between VL and VH
• H-band using a frequency band between VH and U
• Superband Tuner can receive the broadcast band S
• Hyperband tuner can receive broadcast band and S band H

Based on the IF frequency out

IF frequency tuner out there who have 38/38.9/45.75 Mhz frequency. In Indonesia generally use 38.9Mhz frequency, but sometimes there is a use 38.0Mhz

Based on the pin-out

There are several kinds of tuner long pin-out configuration. But now almost all the tuner is already using an international standard 11-pin

Universal tuner

China is now producing "universal tuner" 11-pin. Indonesia was just the market we do not know whether it exists or not. This tuner can be used to substitute for the various types of tuners and tuner can adjust to this direct voltage of 5, 9, or 12v.

RF antenna input connector

Form the antenna input connector there are two kinds, namely:

• RCA type connectors
• Antenna RF connector

Tuner modules

Tuner is a tuner module inside there are all Video IF amplifier circuit and the FM-detector. This kind of tuner is using VS and some are using the FS.

Tuner module has output like:

• RF AGC-out
• RF AFC-out
• Audio-out
• Video-out
• Base band out, the signal to be processed into stereo sound circuit.

Except that in tuner is also sometimes diperlengkapa with audio-switch to TV / AV-in. Therefore, to the sound of the AV-in connected via Audio-in found on the tuner module. Sometimes the sound volume to be controlled in the tuner module.

• SONY tuner module 1
• SONY tuner module 2
• Toshiba tuner module

Impedance input / output

Impedance tuner has all kinds of input / output 75 ohm.

How to distinguish 2-band tuners VS sw with PLL tuner FS

In all these circumstances and the removable pin 11 feet was not cut, it is sometimes difficult to distinguish between two band-tuner tuner sw with FS.

Some models have a tuner pin legs partially emptied. FS Tuner has a location pin 30V voltage 3 numbers from the back (of the IF pin out).

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