Question about LG 42PC3D 42 in. Plasma Television

11 Answers

Tv clicking on and off

I replaced the main board on my 42 inch plasma tv and it is still clicking

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11 Answers

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Hello, you need to check your service manual for voltage testing on the power board. it will tells you what test point to check and what panel tp adjust. you may need to adjust the voltages by using a dmm and adjusting the vs/va/vy
this is recomended after exchanging pcb boards,

service manual info looks like this on a lg service manual


CHASSIS : RF-02RA
MODEL : MT-42PZ40/V/B/R/S
MODEL : MT-42PZ41/V/B/R/S/VB
MODEL : MT/MZ-42PZ42/V/B/R/S
MODEL : MT/MZ-42PZ43/V/B/R/S/VS
(1) Va Adjusment
¤ Connect pin 1 of CN209 to (+) jack of D.M.M.
¤ŁAfter turning the VR402(Va ADJ), voltage of D.M.M
adjustment as same as Va voltage which on label of
panel right/top.(Deviation : ±0.5V)
(2) Vs Adjustment
¤ Connect pin 8 of CN207 to (+) jack of D.M.M.
¤ŁAfter turning the VR401(Vs ADJ), voltage of D.M.M
adjust as same as Vs voltage which indicated on label
of panel right/top.(Deviation : ±0.5V)
(3) -Vy Adjustment
¤ Connect pin 5 of CN208 to (+) jack of D.M.M.
¤ŁAfter turning the VR403(-Vy ADJ), voltage of D.M.M
adjust as same as -Vy voltage which indicated on label
of panel right/top.(Deviation : ±0.5V)
(4) Vsetup Adjustment
¤ Connect pin 1 of CN208 to (+) jack of D.M.M.
¤ŁAfter turning the VR404(Vsetup ADJ), voltage of D.M.M
adjust as same as Vsetup voltage which indicated on
label of panel right/top.(Deviation : ±0.5V)
[ Refer to Typical Voltage
1. Va : 30 ~ 50V
2. Vs : 170 ~ 185V
3. -Vy : -60 ~ -90V
4. Vsetup : 210 ~ 240V
[ Replace PDP Module or Power Board, adjust certainly Power
PCB Assy Voltage.


hope this helps good luck with you tv repair

Posted on Dec 22, 2008

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It can be fixed by replacing the ZSUS terminal board...

If u can't then contact technician...

Posted on Dec 22, 2008

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Your not pluggin the T.V. into a power strip and then into the wall are you?

The clicking may be the surge protector resetting because of to much power being connected into one outlet.

The T.V. probably has a built in one and it keeps going off.

Try plugging the T.V. by itself, into a wall plug with nothing else and see if it works then.

Posted on Dec 17, 2008

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It sounds like the standby supply is running the main power relay, but the set is not starting up. The primary supply or horizontal output transistor might be at fault. If its power supply it can be like in safety mode it is switching the set off when it senses a faulty circuit trying to draw more than its share of current. When it switches off it can`t see the fault anymore so switches back on for another look etc. You would need to take the set to a professional repair center to have it diagnosed, or repaired. Good Luck

Posted on Dec 17, 2008

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The connections you made on the new main board are not proper as it getting short in between so check out for that.it will solve the problem.

Posted on Dec 17, 2008

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This sounds like you need to replace transformer!

Posted on Dec 17, 2008

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Hi headikej,

It sounds as though the problem is not with the board, but rather with the transmission of power to the board. As odd as this may sound, there may simply be a faulty power cord or a loose or faulty wire where the power reaches the board. I admit that these are difficult to test in isolation (unless you have extra parts lying around), but since I'm assuming your TV is no longer under warranty (since you replaced the board yourself), it's a lot less expensive to get the extra wires and test them before you take it to be serviced by someone else.

In an effort to save time and money, I suggest examining the path along with the power travels - from the wall to the board inside the TV. Look at all the wires with a magnifying glass - if you see any exposed, melted, or discolored wire, there's a good chance that it's your culprit. Also check the contacts of the wires if possible. If you see any rust, dip the contact in Coca-Cola and wipe it off with a dry paper towel. If there's on rust, one of the contacts cold have simply lost its electrolytic properties with age - that's when you replace the wire (if you can discern which one).

I hope this helps - please let me know if I can be of any further assistance.

Kind regards,
H2H

Posted on Dec 17, 2008

  • Lorne Dechtenberg
    Lorne Dechtenberg Dec 18, 2008

    Ginko makes a good point - the clicking is not directly due to the loose or damaged connection. Rather, it is a controlled response by the main board in order to prevent a fire (which could happen if a resistor fails - the amount of power passing through a circuit would then exceed the wire's safe limit).

    There's also one other possibility: the problem could be in the power supply itself - if one or more of the of the components in the power supply has stopped working properly (for example, a capacitor building up too much current, or a short circuit near one of the diodes), you may need to replace the power supply. It's not a cheap part (almost $100), but it's a lot less expensive than taking the TV to be serviced. Here's a link to one of the many places you can order the correct model power supply:

    http://www.shopjimmy.com/showparts.cfm?i...

    Again, I hope this helps, and let me know if I can be of any further help.

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Hello sir
thanks for asking us sir try to resold all stches
and on it
i hope your problem solved

Posted on Dec 17, 2008

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For support for your LG product go here: http://us.lgservice.com/index_b2c.jsp
this link will direct you to the manufacturer's website for support and service information

Posted on Dec 17, 2008

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Check with the power supply the switchimg on and off may be because of non proper power supply 

Posted on Dec 17, 2008

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How did you know the mainboard was faulty?

There can be a dafective ysus or zsus board for example, or a bad power supply.

Tell me if the tv blinks a number of times of if there is an error message.

Posted on Dec 17, 2008

  • Ginko
    Ginko Dec 17, 2008

    The clicking is because the TV is on protect mode.
    This is when TV detects a fault and the mainboard activates a safety switch to prevent further damage.
    As I told you frequent faults concern the PSU board and the sustain boards, there are also few more boards that can be defective. All components must be tested before you replace one.



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