How to replace the multi-function high voltage board?

Normally when the laptop computer has a high-voltage board failure, or burns the high-voltage bulb on the display. The machine nonetheless boots usually however the display is black and you must look carefully to see the textual content. For many who have been repairing laptops for   years with full high-pressure boards, screens, and high-pressure bulbs to check, this pan may be very fast to repair. However for individuals who are new to the career or those that would not have many laptop computer our bodies to check, the inspection can be very tough. To correctly test the illness and purchase the fitting replaceable components is crucial.

First, when the machine boots however the display is black, look carefully to see the textual content, it’s essential to test the excessive stress ball first. To test if the excessive voltage board is working or not, it’s essential to do the next steps:

Take away the monitor, unplug the high-voltage bulb connector from the monitor.
Use a separate high-pressure bulb, which could be taken from the damaged display, the display is striped… And ensure that the ball is in good working order.
Plug the excessive voltage bulb into the jack of the excessive voltage board and begin the machine up.

There can be 2 instances: The excessive stress bulb is brilliant and never brilliant. If the excessive stress bulb is brilliant, your display has been burnt out, simply substitute the excessive stress bulb on the display. Case 2 is If the high-voltage bulb doesn’t gentle, your machine will injury the high-voltage board or lose the facility provide to the high-voltage board (as a result of the high-voltage bulb to check remains to be alive). You will need to be aware that the facility provide for the high-voltage bulb may be very excessive from 500 – 1000V  not lethal, however touching it makes you startled and unfortunate, it’ll break the display, or the shopper’s laptop, so watch out when checking .

When checking that the high-voltage board is broken, you proceed to switch the high-voltage board. For these of you who’ve a whole lot of machines, you simply have to get them from one other machine to switch them, for these with few or none (like myself), it’s essential to purchase a multi-function cable board. The common high-voltage board could be changed for nearly all fashions, it has a large voltage vary from 9v -20v. And must be measured and soldered.

+ On the multi-function high-voltage board, there are 4 enter pins and a couple of high-voltage output pins (with a voltage supply of a number of hundred volts).

V-in 5v or 9v-20v. This pin connects to a fuse on the excessive voltage board, decide this pin by measuring the continuity with the fuse positioned subsequent to it.
Foot GND foot mass.
Excessive voltage on/off pin, this pin has a voltage of 3v3
The adj pin adjusts the brightness and darkness, this pin has a voltage of 0 – 5V. If you don’t solder this pin, the display will gentle up at startup after which see the textual content.

+ The wire connecting to the excessive voltage board of the zin machine (not but changed) normally has 6 wires or 5 strands or extra, relying on the machine.

2 crimson wires are V-in.
2 black wires are GND (floor pin).
The opposite 2 wires are the inexperienced wire connecting the on/off pin (En), the yellow wire connecting the adj pin. Or possibly orange and white.

To make certain, activate the machine and alter the meter to the vol scale, the black rod is clamped to the mass, the crimson rod is hooked up to the pins on the plug wire and measure every pin with a voltage of 9-20v, it’s the V pin. -in, pin 3v3 is on/off. Pin 5v is adj, pin 0v is mass pin. Then proceed to solder to the multifunction board.

+ In case of measuring on the adj and on/off pins, each have 3v3, it’s needed to make use of the exclusion methodology. 2 V-in and mass pins are simple to seek out and solder to the board. The remainder of the adj and on/off pins are wanted. Use subtraction by connecting a wire to the on/off pin after which beginning, the machine nonetheless does not gentle up, it is the adj pin, and if the sunshine is on, it is the on/off pin, then hook the remainder of the wire on. is to be.

+To precisely pin on/off can be easy when you’ve gotten the identical board and are energetic (eg your machine remains to be operating, simply take it out to attempt). Decide the on/off pins on the excessive board. stress by:

Take away the machine display with the high-voltage board alive.
Plug the facility into the laptop computer, don’t flip it on.
Alter the chronograph to the X1 ohm scale, the crimson rod is plugged into the mass, the black rod is plugged into the on/off or adj pin. If any pin that the high-pressure lamp lights up, that pin is the on/off pin.

Use an analog meter to test the on/off pins on the excessive voltage boardThat’s the best way to decide whether or not the high-pressure board, the high-pressure ball is alive or useless. There may be additionally a case of SIO chip failure, male chip or lack of 19v, 3v3 voltage for the board to make the ball not brilliant (however within the article, I solely present the best way to substitute the multi-purpose high-voltage board when the chip and voltage are good). Wishing you success.