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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. If you have learned the V3. But the actual situation is we need to know the PSU board has output all the voltages correctly. So that still need to checking the PSU board secondary side output voltages is normal and stable or not. For this symptom, need to know: a If their backlight is lit, need to check the T-con board Vcc voltage input after SMD fuse.
If the Vcc voltage appear typically it is 12V or 5V , the higher opportunity is the T-con board gone. So replace a working T-con board to give it a try.
If not appear, the problem is in the Main board there. If want to do the components level repair, need to check their appropriate section.
If not stable or abnormal, need to check and tracing it to the Main board there. Because some repairer after they replace the T-con board and solved this type of problem, but their actual problem was because of the connector dry joins or etc problem only. After replace it, the TV can start- up and operate properly. You can troubleshoot the Bluetooth Module by measuring the voltages at the connector pins on the Module.
If the voltages are missing or not correct, check the cabling and voltage supply feed from the Main board. Turn on the TV, measure pins 2, 3, 8 and also pin 1for correct DC supply voltages.
If the voltages are missing or not correct, check the cable and supply feed the Main board. Now measure pins 4 and 5 which are the Bluetooth signals. If the voltages for pins 4 and 5 are missing or not correct in the Power On state, the problem is likely the Bluetooth module. For other brands and model TV with Bluetooth Module, their troubleshoot method is nearly same like this repair tips.
So you can using this tip as a reference. After that using the PSU self test methods to make sure that is working properly or not, if not then replace it.
Picture 1 shows the problem: Red solarisation on the bottom of the screen. The left side does not show the problem. What should you consider? This is shown in Picture 2. Notice that in service mode, the right side is all Red, showing you that the signal source is not the problem. This leaves three items as the probable cause: It was not closing tightly enough. Putting hand pressure on the connector there caused the problem to come and go. So try to using the strong tape or silicon glue to fix the connector and prevent it loose again.
So the TV problem was solved. Checking or replace the T-con. If the lines do not appear, disconnect all signal sources and check again. If the lines are gone, then a signal source is causing the problem.
If the lines appear in the Picture Test, the cause is a bad panel. If the lines appear in the OSD Menu, the cause is a bad panel. Try to call out the OSD Menu. Most of the time is their FPC cable contact pins dirty. After clean the screen problem solved.
If the line is gone, then the signal source is the problem. Or try to use the finger to touch or knock the top cover of that line position. See the illustrations below:.
Option Bytes mainly match the correct drive to the panel, but can also have effects based on feature functionality. Some of the settings, if not set correctly, may cause minor defects in the overall operation of a TV. These defects are often not immediately obvious and may be discovered by the customer days after the repair. When power on the TV, everything is OK, after about 2 seconds, display darkness and then no display. After 2 seconds, display back to normal, but after about 2 seconds it will no display.
This will happen several times, after that the TV will auto shutdown. Sound is normal. Suspect their CCFL lamp defective. Use the CCFL tester to testing the lamps, all looking good. The inverter board 24V input voltage also OK. So the problem looks like is the inverter board. Try to re-program their flash memory but no help. The TV owner said this TV has water by his children. When checking their front button, it has liquid inside the buttons.
Use the alcohol to cleaning these buttons. Power on the TV and it is working properly. Try to using the Remote Control or front button also not working at all. So suspect the TV is their firmware corrupted.
Try to re-programmer their firmware, but also no help.
Replace the crystal X, the problem solved! When testing this TV, after about 1 hours, the sound will randomly on and off, after that totally no sound. Because of this TV after warm up the problem will occur, and then suspect that Main board Audio section has component sensitive with heat increase.
Try to using the Hair Dryer to shoot to the Main board Audio section and found that just using about 10 minutes, the TV no sound symptom occur.
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 the TV malfunction and show the error code blinking times , you roughly know where to check and repair it. So you need to check their PSU board first. If not, you will not sure where to troubleshoot the TV first. But it can divide to 4 parts:. For example: At the same time, the Main board will also process the audio signals and amplify it and send to the speaker.
This is a very important section in Main board. This section will received the voltage supply from the Power Supply board and generate the appropriate DC voltage to other system use. These signals can driving the LCD Panel to working and generate the complete display in the screen. After that, convert it into several voltages and supply to the T-con board and also to driving the LCD Panel too. After that, this 3. The TV is in the Standby Mode now.
Finally the TV can show the display now.
If you think your skill is not enough to do that, then I will highly recommend you read these e-books: If not you need to check the AC plug main switch is press ON or not. Check the power cord and the fuse also. 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.
If you have learned the V3. But the actual situation is we need to know the PSU board has output all the voltages correctly. So that still need to checking the PSU board secondary side output voltages is normal and stable or not. If the 5VSTB is normal. For this symptom, need to know:. If the Vcc voltage appear typically it is 12V or 5V , the higher opportunity is the T-con board gone. So replace a working T-con board to give it a try. If not appear, the problem is in the Main board there.
If want to do the components level repair, need to check their appropriate section. If not stable or abnormal, need to check and tracing it to the Main board there. So that we can confirm it. Because some repairer after they replace the T-con board and solved this type of problem, but their actual problem was because of the connector dry joins or etc problem only.
So just replace the T-con board and the problem solved. For this type of TV symptom, it is hard to say which section is defective, but most of the time, it is causing by the T-con board or Main board.
This type of symptom is causing by their Main board firmware setting or firmware corrupted. 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, you need to learn more in this ebook and my other series ebook like V1. But after download a new Main board to replace it, the problem solved! Finally, found the answer for this Main board problem.
Some repairer may said, I had checking their voltage outputs properly and values are stable too. So, is it hard to repair and expensive to replace it? NO, it is cheap and easy to get it! When you confirm that the problem was the Main board, some of the repairer will stop checking it, or just measure some common components then replace the whole Main board and the problem solved and case closed. Or try to replace the crystal and give it a try.
But most of the repairer after doing step No. 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? The Flash Memory voltage input also same too. If this Ripple Voltage over 10mV some Main board will accept to not more than mV ripple voltage, depends on the Main board design , the CPU will not working or working abnormally.
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. After you learn this tip, if you had throw this type of Main board in the trash can before, you will regret it.
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. After open the rear cover, their backlight can lit about 10 seconds, then shutdown about 5 seconds.
But the TV screen is always no display. Surprisingly, PSU board and the backlight system are working properly! So confirm that the problem was in TV Main board. Below is the voltage output value of this Main board:. The above voltage values look like normal and stable. So continue to checking the CPU reset circuit and the crystal waveform.
The Reset Circuit is operating properly. When checking the Crystal, the oscilloscope can detect the Sine waveform, but sometime this waveform will missing and come again! So suspect this Y1 crystal 12MHz is failure and tries to replace it with a new one. But TV problem still the same and no change! This Vref voltage is about 0. Also check their control signals and the clock signals in between to CPU there.
These Control signals are: The Clock signal like: Make sure these signals are reach to the CPU there. Sometime these signals will break in half way. After checking all these signals and the voltage inputs, all are normal. One more thing, before re-program the Flash Memory, I highly recommend to backup their old firmware first before replace it with the new one.
Wow, just a cap can solved this TV problem. The other ceramic capacitors all looks like good. Finally this TV problem solved! It will save your time and the money too! This TV will auto shutdown randomly, but sometime it can work whole day without any problem. When the problems occur, it will non-stop to shutdown and then auto power on again. But some time it can work properly!
But the problems still same. This TV even burn test several days, but it still can working in good condition. Finally this TV problem was solved. Unless you change the Main board, the TV will work! Actually this problem is easy to solve, if you know how to do that. So this is an exception case of the Main board problem. Actually all electronic component inside the PCB board, it is better to use the original part number to replace it.
So this information is to let you know, how to choose the right memory IC for the Main board. The 24C64 can replace 24C The 24C can replace 24C64 and 24C Please make sure that it is using the same IC packages. Because some different packages, their Vcc input voltages will different. For more details, please refer to their own datasheet and it is save before replace it. Yes, it can replace it. And it can work very well.
For example, they can replace with:. PCF pin7 need to connect to ground. The substitute for this PCF series IC also same, choose the bigger size to replace a bit small size memory. Some repairer said they can see any 24Cxx memory IC inside their Main board. Actually it is using the part number or calls it as marking code.
For example, 24C02 can be replaced by 24C04 or 24C If the number is different, the CPU will not accept it and the Main board will not operate or strange problem will occur.
Also make sure that the pins are same. So recommend to read their IC datasheet to compare it first before replace it. They are many type of the flash memory use in the Main board. They are many flash memory manufacturers in the market now. Most of the TV and Monitor Main board flash memory manufacturers are:. MX25Lxxx series - Microchip: N25Sxx - Nexflash: FM25Fxxx - Spansion: T25Pxx - Winbond: When need to replace the Flash Memory IC, the best way is use the original part number.
But most of the time, it is not available or hard to get the original part number flash memory IC. Actually to find the substitute flash memory IC you must follow these rules and successfully to replace it.
But most of the time, their pins configuration is same. Because of this flash memory EN25T80 density is just 8Mbit only. 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 EN25F32, density is 32Mbit also can replace it. Not recommend to use 64Mbit or Mbit to replace it. So the 25B and 25Q series are suitable to substitute the Standard SPI flash memory, but the Standard 25xxx flash memory is not suitable to substitute the 25B or 25Q series.
So for this type of Main board, you need to replace it with the same specification of flash memory IC. This issue is seldom happen, but it happened too.
One more thing, highly recommend to read the original and substitute flash memory specification datasheet first before replace it. So that you can make sure their pins configuration and the Vcc voltage input are same.
And other information like the type of flash memory for original and the substitute flash memory. But most of the time, inside the same column flash memory, it can use as a substitute or equivalent. But make sure that fit the rules on how to substitute it.
This type of design, their brightness is cannot be adjust. But their feature is the same, just to switch on the backlight system.
This signal is use to control the Brightness levels for backlight system. So the P-DIM signal functions like backlight dim control. When you see the screen in front of TV, if a left side a has a problem, connect 2 cable at the 1 position and see the display result. If the LED Driver not shutdown the backlight, it will show as one of screen position is darkness top, bottom, left or right side.
So it will affect the other LED light cannot work. So just using a wire or jumper solder it in the open circuit LED light bulb as photo below, the LED strip or block can light up now. Because when happen heavy shorted in the Inverter Board, it will not start-up the protection and causing the Inverter Board burn and TV maybe explode too!
This method also calls it as: I had one article mention it before at:. Most of the time, we will feel headache when we repair LCD TV with symptom display shutdown after few seconds, but they have normal sound. And sometime, you can use the strong flash light to see some content in the screen there.
These both signals are come from the TV Main board and their normal voltage should be: Also you need to measure the voltage supply Vcc to inverter board is normal and stable; normally it is 24V or 12V. For the CCFL lamp problem, normally it is leakage, broken or their wire contact with the lamp terminal has open. When checking the CCFL lamp, you need to open the lcd panel.
So this chapter is to let you learn the method on different inverter IC for how to bypass their OVP Protection, so that we can see and check their inverter board and the lamps. Before using this method to testing the Inverter board and their CCFL lamps, make sure the Inverter board no any shorted or leakage components in it.
This is a very important step to prevent any burn or explode in the board. When the TV is shutdown the backlight after few seconds, with the help of bypass Inverter IC protection, we can check the Inverter board in components level repair. Before replace, first check their both side of wire terminal connection is solder ok or not.
If not then re-solder it and try to power on the backlight to see the problem solved or not, if not then just replace it with a working one. So that you need to confirm the components in Inverter board is not shorted or leakage. For your information, before using it, make sure they are no any shorted or leakage components in the Inverter board or section there.
Or remove the component connected to this pin, so that it is same like this pin is open circuit or disconnect from the inverter circuit. The reason to replace it was because the LCD Panel is broken or damage.
But their question is how can I replace it?
This method was wrote in V3. The important information we need to know for LCD Panel are:. But it also divides to different aspect ratio DAR , they are: This bit of marketing obfuscation is calculated as horizontal resolution x vertical resolution x 3 HxVx3. Also have different channels for each bits, for example, 8 bits 2 channels LVDS interface , 10 bits 4 channels and etc. Normally it has 20 pins, 30 pins, 41pins, 51 pins and etc. Inside the datasheet you can find lots of useful information to help you to replace the LCD Panel correctly.
For your information, some of the Main board is already built-in 12V and 5V Panel select jumper to choose. For the LVDS connector type we can use the eyes to look at it. If their pins configuration is different, some LVDS cable can manually change or correct their pins position to the right position. For this step, we must refer to their LCD Panel datasheet to do it correctly.
Normally different LCD Panel manufacturer they have different method to setting it. To set this signal pin you can do like that:. Some high definition LCD Panel is using the 10 bits type. The 10 bits type LCD Panel divides to two:. So this type of LCD Panel can choose to working in 8 bits or 10 bits status. Because it just use two connector or wire in their inverter board only. Most of their connector design is same, so it will let the repairer easy to replace it.
But make sure all the voltage cable, signals cables are connecting correctly. If the replacement LCD Panel is using master and slave inverter board but original LCD panel just has single inverter board, then you need to modify it and connect the extra cables to their slave inverter board there. Make sure their voltage supply and signals cables connecting correctly. For example 32 inches is use the 32 inches LCD Panel as a replacement. The Also their aspect ratio DAR must choose it correctly and it is divides to: If the original LCD Panel is thicker than the replacement, it is ok to replace.
Because the TV cover can close it perfectly. But if the original is thin than the replacement, it is hard to say ok or not.