Viewsonic vp2013b flickering screen

[belippy]

I have already tried to change a few caps on the main board, but the problem is still there.

Will the problem be the main board or the power board?

Is there a way to find out this kind of problem?

Thanks

[tom66]

Re: Viewsonic vp2013b flickering screen

It looks more like a T-con board problem. On smaller LCDs this is not replacable, yours might be an exception. The T-con is attached directly to the LCD panel and is usually at the top of the display.

[belippy]

Re: Viewsonic vp2013b flickering screen

Can a t-con board be replaced?

[budm]

Re: Viewsonic vp2013b flickering screen

Just to be sure, check the voltages on the 3-pin regulator IC's (I see 3 on the board) on the signal processing board (the board where you plug in the VGA cable) also. Also try heating up the T-CON board and the signal baord with hair dryer to see if the symptom changed.

[belippy]

Re: Viewsonic vp2013b flickering screen

I have tried to heat up the both board with a hair dryer and result stayed the same.

Checked the 3 regulators with following result:

Part number 1084-0544AL (located at u20 on the signal board)
pin 3 = 4.92
pin 2 = 1.81
pin 1 = 0.56

Part number 1084-0544AL (located at u16 on the signal board)
Pin 3 = 4.92
pin 2 = 3.33
pin 1 = 2.07

Part number LD1117-c550 (Located top center on signal board)
Pin 3 = 4.94
Pin 2 = 2.51
Pin 1 = 1.26

power was on when I test them.

[budm]

Re: Viewsonic vp2013b flickering screen

OK, the regulators outputs are good.

[belippy]

Re: Viewsonic vp2013b flickering screen

Last thing will be the T-con board.

[belippy]

Re: Viewsonic vp2013b flickering screen

One thing i'm confused. The two regulators (u16 & u20) have the same model.
But their output are so different!

[budm]

Re: Viewsonic vp2013b flickering screen

They may be adjustable regulators, the output voltage is set by the resistor network on one of the pin.

[t.j.]

Re: Viewsonic vp2013b flickering screen

have you tries a differ monitor on comp to make sure it not vid card?

[belippy]

Re: Viewsonic vp2013b flickering screen

have you tries a differ monitor on comp to make sure it not vid card?

I have 3 of the same monitor, only this one acting like this!

[belippy]

Re: Viewsonic vp2013b flickering screen

They may be adjustable regulators, the output voltage is set by the resistor network on one of the pin.

Thanks, budm.

Are there anything I should check before I buy a new T-con board?

[t.j.]

Re: Viewsonic vp2013b flickering screen

had to ask!
peace

[belippy]

Re: Viewsonic vp2013b flickering screen

had to ask!
peace

sorry t.j.

not meant to make you mad

problem with my english and my communication's skill....

I should have said it in a better manner, I will pay more attention in the future. sorry again!

[t.j.]

Re: Viewsonic vp2013b flickering screen

not mad! all good! have to check everything! good luck!
peace

[belippy]

Re: Viewsonic vp2013b flickering screen

I tried to reflow the chip on the T-con, but the screen has same distorted graphic.

sorry about the quality of an iphone!

[belippy]

Re: Viewsonic vp2013b flickering screen

ok, I already bought 2 new T-con boards. Nothing has improved.

After I install the first T-con, it's even worst.

And recently I've order a new one from some where else. Not much of a difference.

What else could it be?