Haier plasma TV P32R1 black screen troubleshooting method - android - Phones Developers

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1, Haier plasma p32r1 TV.
The fault is sound, black screen, the power supply 5v is normal, and the vs 190v is only 2.2v. Va 60v only 2.5v can be normal, normal time can be viewed continuously, the measured vs voltage at boot time is normal 190v immediately turned to 2.2v, it seems to protect, after checking the power supply board has a vs voltage adjustment potentiometer, adjusted to 183v Just fine.
2, Haier P32R1 black screen from time to time, flashing Haier plasma P32R1, reflecting the occasional shutdown when watching, because this situation has to be observed for a long time, it is pulled back to the maintenance department to test the machine, but the test machine has not failed for a few days, Returned to the user's home, after the user's test machine failed, the user's home voltage was 236V, and the maintenance voltage was only 218V. It can be preliminarily determined that the voltage is high, causing protection, and pulling back the maintenance check again, using one liter. When the pressure regulator was adjusted to 242V, the machine could not be turned on, and then the main power board was removed to study its protection circuit. It was found that the board had two sets of over-voltage protection circuits. A group of AC 220V rectified and divided to DZ1218.2V Zener tube clamp protection, that is, the sampling voltage is higher than 8.2V will trigger the protection circuit. The other group is from the 300V DC voltage divider sampling to the DZ12211V Zener tube clamp protection circuit. When the sampling voltage is higher than 11V, the protection circuit will also be triggered. When the mains supply is at 236V, DZ121 and DZ122 are close to the breakdown state. If you want this machine to work normally at voltage 245, you must change the above two diodes. Then I will have two Zener diode values. After a little more, the machine can work at 245 without protection.
3, Haier P32R1 light is not turned on Haier P32R1 light is not turned on, black screen, measuring power supply 5V power supply normal, press the power button after each output voltage is normal, try to replace the driver board after troubleshooting, another image surface has small black spots, It is also troubleshooting after replacing the driver board.
4, common fault analysis and maintenance measures
1. No picture, STANDBY red light is not lit, check whether the power switch is turned on, and whether the test filter and the power board's FUSE are intact. Test the output voltage of each power board (refer to the specifications on the module or socket voltage specifications).
2. After power-on, the indicator light changes from red to off, but there is no image, it may be the motherboard, Y driver board problem. a, use a good motherboard, turn the whole machine switch on, remote control, there is OSD, then there is a problem with the original motherboard. b. If there is no OSD after A, please replace the Y engine board and experiment if the OSD appears, indicating that the Y engine board is broken.
3. The picture is blurred. Please replace the Y driver board.
4. The upper and lower parts of the image, some of them, some of them are not. From left to right, please check the connection board of the logic board and the Z drive part of the power board.
5, black vertical line or belt, please check, the logical adapter board and the adapter cable below the corresponding part is good, otherwise, the module problem.
6, black horizontal line or belt, please check, the right side (viewed from the back) Y adapter board and the connection with the module is good, otherwise, the module problem.
7, the screen appears, no light, flashing, long bright pixels, or a single / multiple up and down or left and right lines no image, please replace the module.
5, the function of each module of the module and the phenomenon caused by the fault
1. CONTROL board output signal control.
2. Y/Z drive, receive signal, and amplify to form a high-voltage drive signal to drive the module to emit light.
3. The Y/Z side FPC is connected to the substrate and outputs a horizontal scanning signal.
4. The X side is connected to the substrate, and the image data is processed and addressed to output a vertical signal.
6, various phenomena caused by module failure:
1 movement board: A, lack of color, poor color gradation. B, no sound, but the speaker can output noise. C, the power output is normal, there is OSD, there is backlight, but no picture. D, can not boot. E, the screen has interference stripes. F, after the heat engine, automatically shut down. G, 1080I screen shakes up and down.
2 Logic board: A, the screen output is abnormal. B, can not boot.
3 Power board: No picture, no power output to each board.
4 Z drive part of the power board: A, no picture. B, the color is not enough. C, the screen flickers. D, can not boot.
5 Y drive: A, can not boot. B. The power supply has a signal output and the picture is dark.
6 Sound amplifier: A, no sound output, (no sound inside and outside the speaker, including noise.) B, the speaker is noisy.
7Y/Z-drive board: The component temperature is about 55 °C, and the temperature is abnormally high after the load is applied, which may be the fault point.
8 Z drive section and cable on the power board
7. Analysis of common phenomena of movement failure phenomenon 1: The display screen cannot be lit. Possible reasons:
a. Is the motherboard power supply plugged in?
b. Is the motherboard working properly?
c. Is the VS and VA on the module normal?
d. Is the LVDS cable plugged in?
Whether e.standby5v is normal and Vs On is high.
Phenomenon 2: The motherboard is not working properly.
a. Whether there is a virtual soldering or short circuit on the motherboard (mainly to ensure that the output of the power supply circuit is normal). b. Is all power supplies (5V, 12V, U7/3.3V, U27/1.8V, U10/2.5V) on the motherboard normal? c. Is the primary I2C signal normal? d. Whether the crystal oscillator starts to oscillate and the frequency is the same as the crystal housing.
Phenomenon 3: The display has no image (no LOGO screen) a. Is the motherboard power supply normal? b. Does the motherboard work? c. Whether the motherboard LVDS has data transmission.
Phenomenon 4: There is no sound in the image a. Is the power input to the power amplifier board normal? b. Is the speaker plugged in? c. Whether the power amplifier board U14 has a virtual soldering or short circuit phenomenon.
Phenomenon 5: There is no sound. Image a. The VSon voltage is output normally. b. Is the signal cable plugged in? c. Whether the data signal on the signal line has voltage. d. Is the output signal of the LVDS chip normal?
Phenomenon 6: No VGA image A. VGA socket is normal. b. Is the VGA source normal (whether the PC is turned on or not).
Phenomenon 7: VGA image lacks color or interference a. Check if the 5V power supply of D7, D9, D10 is normal. Other: Plug in the power supply, 12V pull low: The main reason is that the motherboard has a power supply to the ground short circuit. Short-circuit of the power supply: The main reason is to short-circuit the tantalum capacitor and short-circuit the IC power supply pin to ground.
8, factory debugging methods:
How to enter the factory mode: open the menu, then press the number 8893 to enter the factory mode; exit the factory mode. Press the key or OK button to exit the factory mode. In the factory mode, press the menu button to turn the page, press the program +/- button to select the item, the volume +/- button to modify the value of the selected item or perform the operation of the current item.
Instructions:
1. White balance related items:
Signal source off, AV1, S-Video, YPbPr/YCbCr, VGA
Automatic white balance>>>
2, color temperature related items:
Color temperature cool / standard / warm color temperature R 50
Color temperature G 50
Color temperature B 50
3. Boot Logo: When set to Off, the boot LOGO and screen saver will not appear; when set to On, the boot logo and screen saver will appear.
4. USB: When set to off, you cannot switch to USB with USB key and TV/AV key; when set to on, you can switch to USB.
5, power on state: When set to off, the TV is in standby state after AC power on; when set to power on, the TV is turned on after AC power on; when set to Last, after AC power on, the state of the TV is before AC power off status.
6. Subwoofer: When set to On, the item about the subwoofer is displayed in the sound menu; when it is set to Off, the item about the subwoofer is not displayed in the sound menu.
7, signal preset: factory signal preset function. When this item is selected, press the volume + button to start execution. When ">>>" changes from green to red, the factory signal preset is completed. After exiting the factory mode, just change the station.
8, initialization E2PROM: E2PROM reset function, in this election, press the volume + button to begin, when the ">>>" from green to red, E2PROM reset command is completed, the AC power failure restart, E2PROM is reset It is.
9, Version version number (cannot be modified)
Haier P32R1 and other TV screens often appear 3A, and sometimes do not boot, the replacement power board is repaired.