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First, Samsung V2 screen self-test method: (1) cancel the TV manufacturer to produce all the circuit boards, short-circuit the power board socket CN8023, 4, (CN802 pin 4 POWER-ON / OFF ground), the signal comes from the motherboard CPU output The second power-on control signal, after short-circuiting the foot, is equivalent to the user pressing the on/off button;
(2) Toggle the toggle switch SW2001 on the logic board from the original external mode (1, 2, 4, 3) to the internal mode (self-test mode) (1, 3 up, 2, 4):
(3) Turn on the power and see if the screen is lit. If the screen displays the full white field signal, it indicates that the TV manufacturer produces a motherboard or video processing board fault. If the screen has no display or does not display a full white field, the screen and screen components are faulty. Second, Samsung V3 screen self-test method:
The Samsung V3 screen self-test mode is basically the same as the V2 screen, except that the bit number of the shorted socket is different. Shorten the CN9004 3 and 4 pins in the V3 screen to realize the voltage output of the power board. The toggle switch bit number and toggle position required to display the full white field grating are exactly the same as the V2 screen.
Third, Samsung V4 screen self-test method:
Disconnect all the connecting lines of the screen and signal board, short the CN8007 3, 4 pins of the socket, and short the CN2034 3, 4 pins of the logic board socket. At this time, the plasma screen should display the full white field grating, otherwise the plasma screen will be It should be a fault screen.
Fourth, S42SD-YD09 self-test mode (V5 screen):
(1) Short-circuit the two jumpers of the logic board socket CN2001(3)(4) (horizontal direction).
(2) Short-circuit the PS-ON pin to the ground pin in the third socket on the left side of the power supply board (short pin 8 and pin 9 of CN8003). The fourth pin is the PS-ON signal from the bottom to the top.
(3) Remove all signal boards produced by TV manufacturers.
(4) A full white field should appear after power-on.

Five, S50HW-YD01 self-test mode
(1) Short the CN2012 on the logic board;
(2) Short-circuit the PS-ON of CN8003 on the power supply board to ground;
Sixth, S50HW-YD02 self-test mode (W2 screen)
(1) Short circuit the two jumpers of the logic board socket CN2007(3)(4) (vertical direction).
(2) Short-circuit pin 8 and pin 9 of the power strip socket CN8003. The purpose is to short the PS-ON pin to the ground to achieve the second boot.
(3) Remove all signal boards produced by TV manufacturers.
(4) There should be 7 color pictures (such as Red Square, Blue Field, etc.) after power-on.

Seven, LGV7 screen self-test method First, the TV manufacturer's motherboard, AV board and power supply auxiliary board cable are disconnected, then the AC input socket is directly connected to the LG power board input terminal CN101, and then the logic board (Logic main The upper resistor R407 is disconnected. After power-on, the image screen (various test cards) should be scrolled on the screen.

Eight, LG-PDP32F1X031/374 screen self-test method (1) disconnect TV manufacturers to produce motherboards;
(2) connecting the pinhole ends of the resistors R117 and R118;
(3) Power-on test machine, when normal, red, green, blue screen and other test signals can appear on the screen;
(4) After the self-test is completed, the above changes are restored. Otherwise, the image cannot be displayed normally.