Lcd tv repair pdf

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whether DVD or CD - the principle is clear in your head and thus the repair Take for example one of the commonest causes of faults in LCD TVs – the inverter. V LCD TV Repair · Tips & Case Histories Plasma TV Repair Guide- Like the new LCD models the Plasma models have gotten lighter, thinner and. Recommended Troubleshooting & Repairing LCD TVs Ebook. Learn how to repair common Format: Ebook download in PDF format. Pages: Language .

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you for all. TVs use LED back or side lighting and do not have a large bulky back light and do LCD TV Power Supply (IP BOARD) Schematic Diagram &. TV Repair Tips V LCD TV Repair Tips & Case Histories LCD/LED & 3D TV OLED TV SERVICE MANUAL - as gasoline or candles, or expose the TV to direct air . DISPOSAL (Hg lamp only used in LCD TVs) The owner's manual in PDF file format is supplied.

SMD all are gone. C LPB, Lamp: Cristian Brito Rivas. Just a simple method to repair this LED strip or block. So some of the LCD they will not match to replace. This signal is use to control the Brightness levels for backlight system. If U1 CMB damage.

So confirm that the Audio section is the causing this symptom. After the hair dryer shooting to Audio section, it is slowly drop to 0V and the sound gone! Use hair dryer to concentrate shooting on this circuit and found one SMD capacitor C 1uF leakage and sensitive in heat increase. After replace this cap, the TV no sound problem solved! So trace these two lines to the Tuner section and found that Tuner socket got two pins was shorted. After re-solder these two pins, this TV problem solved!

But they are never provided more details or information about the TV. So that you need to know about these:. After that, power on the TV to look at their symptom is it same describe as the customer complaint.

If the TV problem same as the customer describe, so we can start to check the TV now. If the TV symptom is different than what customer describe, then we need to call the customer first before proceed it.

When an abnormally occurs in TV, the self test protection circuit will operate and reset the unit to standby mode. So their TV. LED light blinking 1 times then stop 2 seconds and continue to blinking 1 times. But not all the service manual will show their error chart. So you need to search other nearest model service manual to compare with it. If not. They are: So you need to check their PSU board first.

Or you need to do the components level repair. For the Power Supply Board. The Power Supply board will generate several output DC voltage supply in their secondary side and supply it to Main board. Tuner Vcc and all analogue and digital circuits use. CPU Vcc. These signals can driving the LCD Panel to working and generate the complete display in the screen. This section will received the voltage supply from the Power Supply board and generate the appropriate DC voltage to other system use. At the same time.

Repair pdf tv lcd

This is a very important section in Main board. After that. CPU core power. But it can divide to 4 parts: For example: TV Tuner. Finally the TV can show the display now. After press the power on switch button in Front Panel board or remote control.

CPU and the Front Panel board. The TV is in the Standby Mode now. If you think your skill is not enough to do that. But the actual situation is we need to know the PSU board has output all the voltages correctly. If their Standby voltage 5V is appear but other voltages are no output then you need to check the Main board and the Front Panel board.

So that still need to checking the PSU board secondary side output voltages is normal and stable or not. Check the power cord and the fuse also. If you have learned the V3. If it is appear Vac or Vac. If not you need to check the AC plug main switch is press ON or not.

If the Vac or Vac appear. If the Vcc voltage appear typically it is 12V or 5V. For this symptom. If these signals appear. For example the HDMI section. If not appear. So that we can confirm it ImagineX ElectronicS. In this case.

Regarding this type of symptom. AV section and etc. If want to do the components level repair. So replace a working T-con board to give it a try. If not stable or abnormal. With this tool. This type of problem is same as the 3 a. So just replace the T-con board and the problem solved. Because some repairer after they replace the T-con board and solved this type of problem. Besides the FPC cable. This type of TV problem. The above information is just for the repairers who want to repair the TV in board levels repair only.

If you need to do the components levels repair. This type of symptom is causing by their Main board firmware setting or firmware corrupted. For this type of TV symptom. I had checking their voltage outputs properly and values are stable too. Some repairer may said.

But after buy a new Main board to replace it. The Main board problem like: From the above TV symptoms. For the DC-DC circuit.. But most of the repairer after doing step No. For some repairer. Or try to replace the crystal and give it a try.


For example the 1. So the acceptable voltage values for 1. So what will cause the CPU not working or working abnormal except the voltage input not correct or not stable? If a bit different voltage values. After you learn this tip. But from lots of the Main board repair case. So the TV repairer will think this output voltage is ok and can be trusted Because of the Multimeter and Oscilloscope not detect any abnormal values or waveform there.

The Flash Memory voltage input also same too. If the Ripple Voltage is below 10mV. So just replace the old electrolytic capacitor in the circuit with a new one. The values of that capacitor should be same or a bit more capacitance than the old one. But the TV screen is always no display. After open the rear cover. So confirm that the problem was in TV Main board. The steps to checking the TV Main board are: PSU board and the backlight system are working properly!

Below is the voltage output value of this Main board: When the backlight lit about 10 seconds. But TV problem still the same and no change! So continue to checking the CPU reset circuit and the crystal waveform. When checking the Crystal.

The Reset Circuit is operating properly. So suspect this Y1 crystal 12MHz is failure and tries to replace it with a new one. Make sure these signals are reach to the CPU there.

Also check their control signals and the clock signals in between to CPU there. WE and CS. After checking all these signals and the voltage inputs. Sometime these signals will break in half way. This Vref voltage is about 0.

These Control signals are: The Clock signal like: CPU or just replaces a new Main board. The last remaining is replacing the DDR Ram. I highly recommend to backup their old firmware first before replace it with the new one. One more thing. Finally this TV problem solved! Starting now. It will save your time and the money too! If all voltage outputs normal and stable. The other ceramic capacitors all looks like good.

This TV even burn test several days. Finally this TV problem was solved. But some time it can work properly! Even try the repair tip procedure on 1 above. When the problems occur. When the TV auto shutdown.

But the problems still same. Actually this problem is easy to solve. For more details on how to do that. Their Main board is ok. The front LED light will flashing Red. Unless you change the Main board. Green then Red again and non-stop or etc. So this is an exception case of the Main board problem.

Besides to using the Programmer to send data or firmware to memory IC. Actually all electronic component inside the PCB board. So this information is to let you know.

But some time it is difficult to do that. Please make sure that it is using the same IC packages. The 24C08 can replace 24C04 and 24C And it can work very well.

But the 24C32 cannot replace 24C Because some different packages. For more details. The 24C64 can replace 24C KOR and KS. Write Protect have two kinds of method to connect it. The 24C can replace 24C64 and 24C Actually it is using the part number or calls it as marking code.

PCF pin7 need to connect to ground. Besides the DIP packaging. N8 24CS Also make sure that the pins are same. So recommend to read their IC datasheet to compare it first before replace it. If the number is different. They are many flash memory manufacturers in the market now. ShangHai Fudan Microelectronics: Most of the TV and Monitor Main board flash memory manufacturers are: A25xxx series. But in this chapter. MX25Lxxx series. They are many type of the flash memory use in the Main board.

Collection of LCD LED TV Repair Tips V4.0 - Kent Liew.pdf

Chingis Technology Corp. Vcc input voltage and their pins configuration. Actually to find the substitute flash memory IC you must follow these rules and successfully to replace it. Because of this flash memory EN25T80 density is just 8Mbit only. Not recommend to use 64Mbit or Mbit to replace it.

So the Main board firmware is missing half of the data and cause the firmware corrupt. So we can use the W25X16 16Mbit to replace it. Or use the EN25F And other information like the type of flash memory for original and the substitute flash memory. This issue is seldom happen. Unique ID series.

So for this type of Main board. Default Lock Protection series and so on. Actually the flash memory different to several types.

So that you can make sure their pins configuration and the Vcc voltage input are same. EN25P10 M25P But make sure that fit the rules on how to substitute it.

EN25Q64 M25P One of the reasons is. This type of design. Brightness control. For the LED Driver. For international standard. But their feature is the same. If after changed cable position.

Tv repair pdf lcd

If after changed cable position the TV a side has normal picture now. So the P-DIM signal functions like backlight dim control. This signal is use to control the Brightness levels for backlight system. When you see the screen in front of TV. Remember below TV symptom. So it will affect the other LED light cannot work. If the LED Driver not shutdown the backlight.

Just a simple method to repair this LED strip or block. So just using a wire or jumper solder it in the open circuit LED light bulb as photo below. This method also calls it as: These both signals are come from the TV Main board and their normal voltage should be: I had one article mention it before at: Also you need to measure the voltage supply Vcc to inverter board is normal and stable.

And sometime. Before checking the backlight system. Because when happen heavy shorted in the Inverter Board. For the CCFL lamp problem. But make sure to carefully remove their metal shield and other parts to prevent any damage on the lcd panel glass. Before replace.

LCD TV Repair Guide Handbook_140211_v1

When the TV is shutdown the backlight after few seconds. When checking the CCFL lamp. If not then re-solder it and try to power on the backlight to see the problem solved or not. This is a very important step to prevent any burn or explode in the board. For your information. So that you need to confirm the components in Inverter board is not shorted or leakage. Or remove the component connected to this pin. PSU board.

This method was wrote in V3. But it also divides to different aspect ratio DAR. Inverter Board and the T-Con board. Actually the LCD Panel has two types. In this chapter.

Repair lcd pdf tv

The important information we need to know for LCD Panel are: But their question is how can I replace it? Normally I will not recommend this method to the TV repairers who are: The reason to replace it was because the LCD Panel is broken or damage. Standard Definition SD: Also have different channels for each bits. Each real pixel includes one subpixels for each of three colors. Normally it has 20 pins.

This bit of marketing obfuscation is calculated as horizontal resolution x vertical resolution x 3 HxVx3. For the small inches LCD Panel. For the LVDS connector type we can use the eyes to look at it. For this step. If their pins configuration is different. Make sure their Vcc Voltage Input pin is put in the correct position. Inside the datasheet you can find lots of useful information to help you to replace the LCD Panel correctly.

As usual. Active High or Open. Some high definition LCD Panel is using the 10 bits type. Normally different LCD Panel manufacturer they have different method to setting it. So this type of LCD Panel can choose to working in 8 bits or 10 bits status.

The 10 bits type LCD Panel divides to two: To set this signal pin you can do like that: For example 32 inches is use the 32 inches LCD Panel as a replacement. If it is LCD type. Because it just use two connector or wire in their inverter board only. If the LED type.

The Most of their connector design is same. H or Open. Make sure their voltage supply and signals cables connecting correctly. But make sure all the voltage cable. But if the original is thin than the replacement. Make sure the TV rear cover can close it perfectly. If the original LCD Panel is thicker than the replacement. Because the TV cover can close it perfectly. Also their aspect ratio DAR must choose it correctly and it is divides to: You can use these tables as a reference only.

Besides the 5V and 12V. So be careful about it. So it is suggest referring to their datasheet for more details. So you can find the correct LCD Panel to replace. So some of the LCD they will not match to replace. Another thing is their Panel voltage input Vcc.

If we know how the T-con board work and also know how to troubleshoot it. But they are same thing. So we can search the parts online or find the part in the junk T-con boards. For more basic knowledge of T-Con Board.

And then replace a new Panel or just return back the Monitor to customer and say beyond repair or not worth to repair. This VDA voltage will go to: No wonder the Timing Control section is design inside the Panel. Some repairer will say the T-CON board is cheap to replace. So we must learn how the T-CON work and the method to troubleshoot it.

But different design it has a bit different on it. This VREF voltage normally is about Remember this rules.

After the VREF voltage was generated.

If the Vcom voltage not stable or their voltage is out from the original values. The Vcom VCM. If this is happen to your TV. When the Vcom VCM voltage is missing. So you can find the VREF voltage to measure it and then you can roughly know what the voltage values for the Vcom voltage are. Normally is about 14 channels. PGM or etc. If not find any components failure.

Especially the cheapest price of AS15 IC. Sometime after replace the AS15 IC. But when change to another batch of AS15 IC. So the screen is non-stop to change like that. Actually the AS15F. Even the ASHG batch no: So lots of the TV repairer if they facing this problem before. Because it will cause this T-con board cannot last long to use. So be careful when using the MA as a replacement. When D1 damage. Another design of the VH1-C If U1 CMB damage. If that is CMD is about ohm.

If the TV screen is abnormal display. N N Voltage OK? No Power Check check method 1. A-Dim LED: Repair Method by Symptoms C Only LPB: C LPB, Lamp: N Replace module Check external device connection condition Page 31 Good? Module Check One Point Repair 1. C 3. C -6V VGH: D 3. D 27V VDD: D 16V VGL: Check the Wifi wafer Pin no. Normal Voltage 3. Wi-Fi disconnection 2. Check the Camera wafer P pin no. Check Voltage 3. RF Remocon Test3. Check RF assy connection Normal Operating?

Normal Operating? Close Press the back and home key at the same time about 5sec Is it shown ok message? Check a label on TV Side or Rear Malay K Ghosh. Jose Silva. Cristian Brito Rivas. Roberto Carlos. Manoranjan Yadav. Weerut Srhidhara. Luan Barbosa da Costa. Jily Toomis. Stephen Boyce. Heriberto Flores Ampie. Jeank Rivadeneyra. Omar Ayoub. Gerardo Rubin.

Pdf lcd tv repair

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