samsung 226ux

[lhock98]

hi guys,

i'm newbie for repairing LCD monitor. i have a samsung 226ux monitor that power on have blue light but nothing for display? i had already replaced 2X680uf capacitor's still the same, for visible check the 330uf and 820uf both cap's looks o.k. can someone tell why how to fix this monitor....thanks

[retiredcaps]

Re: samsung 226ux

i'm newbie for repairing LCD monitor. i have a samsung 226ux monitor that power on have blue light but nothing for display?

Can you see the display using a flashlight?

If no and you have a multimeter, check the fuses. Turn off the power and unplug your monitor. Put your multimeter on the lowest ohm setting and measure the resistance across the fuse. It should read 0.3 ohms.

Also, please post clear focused pictures of your boards (top down and both sides) after reading the instructions at ...

https://www.badcaps.net/forum/showthread.php?t=1868

[lhock98]

Re: samsung 226ux

thanks for reply....it's totally black screen after power on. i had check the output supply from mainboard to the inverter board. pins 2,3,4 are GROUND and 4,5,6 are 13v. reading from the multimeter tap from 2,3,4 and 4,5,6 showing 13v...correct voltage......any idea???

[retiredcaps]

Re: samsung 226ux

thanks for reply....it's totally black screen after power on. i had check the output supply from mainboard to the inverter board. pins 2,3,4 are GROUND and 4,5,6 are 13v. reading from the multimeter tap from 2,3,4 and 4,5,6 showing 13v...correct voltage......any idea???

Different monitors use different voltages. Some power board PCBs have the voltages printed right on them. We can verify if we see a picture (hint).

There are also fuses on the inverter board which might be open.

Transistors can also be open which might cause a black screen.

[lhock98]

Re: samsung 226ux

base on the site https://www.badcaps.net/forum/attach...7&d=1256466308 can you tell me which one is the fuse??sorry for asking....hehehe

[retiredcaps]

Re: samsung 226ux

base on the site https://www.badcaps.net/forum/attach...7&d=1256466308 can you tell me which one is the fuse??sorry for asking....hehehe

The fuses in the above URL are F101 (next to AC input) and green "jellybean" next to the word "DIP".

Fuses are designated with the letter "F" on PCB boards. Picofuses use "PF".

If both test 0.3 ohms, I'll need a better picture (top down view of both sides). The above pic is angled and obscures some components.

[lhock98]

Re: samsung 226ux

o.k i"ll get back the picture to you tommrrow because it's getting late now...thanks good night to you.

[lhock98]

Re: samsung 226ux

Hi retiredcaps,

i had attached the picture for your reference pls take a look. the fuse (F101)
reading was 0.3 ohms, beside the DIP word the capacitor (680uf) already replaced.

[lhock98]

Re: samsung 226ux

Hi retiredcaps,

i had attached the picture for your reference pls take a look. the fuse (F101)
reading was 0.8 ohms and the longbean fuese (F301) show none, beside the DIP word the capacitor (680uf) already replaced.

[retiredcaps]

Re: samsung 226ux

the fuse (F101)
reading was 0.8 ohms and the longbean fuese (F301) show none, beside the DIP word the capacitor (680uf) already replaced.

Just to confirm, what is the ohms reading on F301? What do you mean by show none?

[Krankshaft]

Re: samsung 226ux

If the green pico type inverter fuse is blown (meter should read OL on ohms or not beep on continuity) one of those 4 pin DIP packages (inverter driver FETs) are shorted as well.

The fact that you're not even getting a flash of light signifies the inverter fuse is blown. The main PSU has to be functioning since the main board is still illuminating the power led.

[retiredcaps]

Re: samsung 226ux

If the green pico type inverter fuse is blown (meter should read OL on ohms or not beep on continuity) one of those 4 pin DIP packages (inverter driver FETs) are shorted as well.

And if the FETs are shorted, you must resolder all the transformer pins.

What is the part number of those 2 FETs?

[lhock98]

Re: samsung 226ux

the F301 showing nothing (no ohm reading), i'm getting more confusing now???what's FET???the replaced 680uf capacitor is it o.k??

[sceva]

Re: samsung 226ux

FET is short for MOSFET. I think they are referring to the two black devices near the center of the board between the two caps. They each have 4 legs on each side.

[retiredcaps]

Re: samsung 226ux

the F301 showing nothing (no ohm reading), i'm getting more confusing now???what's FET???the replaced 680uf capacitor is it o.k??

If you have no reading, or 0L or 1 on your multimeter, that means infinite. Therefore F301 is shorted and will require replacement. I suggest ordering 2 of them after you test the FETs.

[pedro]

Re: samsung 226ux

If you have no reading, or 0L or 1 on your multimeter, that means infinite. Therefore F301 is shorted...

No, it means it is OPEN, BLOWN, RUPTURED, KAPUT. It started life as a short.

[retiredcaps]

Re: samsung 226ux

No, it means it is OPEN, BLOWN, RUPTURED, KAPUT. It started life as a short.

Yes, I that is what I meant OPEN, not shorted.

I was in a rush and probably had FET on my mind when I wrote that reply because I was running late to be somewhere.

[lhock98]

Re: samsung 226ux

so to say that the fuses F301 and the F101 need to replace, right?how to check the FET in working condition? the FET part number is 4511GED, the fuese F101 did not beep when i shorted together.

[retiredcaps]

Re: samsung 226ux

so to say that the fuses F301 and the F101 need to replace, right?how to check the FET in working condition? the FET part number is 4511GED, the fuese F101 did not beep when i shorted together.

Okay, let me try this again.

FUSE
====

A good fuse should measure around 0.3 ohms. To measure a fuse,

1) turn the power off and unplug the monitor.
2) Put the black probe in the COM jack.
3) Put the red probe in the ohm jack.
4) If you have a manual range multimeter, set it to the lowest setting (usually 200 ohm).
5) Put the black probe on one side on the fuse.
6) Put the red probe on the other side on the fuse.

If the fuse reads 0L, it is a bad fuse.

If F101 reads 0.8 ohms, it is probably a good fuse. If F301 reads 0L, it is a bad fuse.


Testing MOSFETs

http://ezinearticles.com/?MOSFET-Tes...res&id=2309124

Datasheet for your mosfet to id source, gate, and drain is at

http://www.alldatasheet.com/datashee...AP4511GED.html

[lhock98]

Re: samsung 226ux

hi brother,

after followed your guide i'm very happy that my monitor up and running now.
the parts that i have change is 680uf 25v and a pico fuses. really thanks for your value infomations you have provided to me. this is the first time i have success repair a lcd monitor i'm very very millions thanks to you...cheer.


rds,
Albert.

Okay, let me try this again.

FUSE
====

A good fuse should measure around 0.3 ohms. To measure a fuse,

1) turn the power off and unplug the monitor.
2) Put the black probe in the COM jack.
3) Put the red probe in the ohm jack.
4) If you have a manual range multimeter, set it to the lowest setting (usually 200 ohm).
5) Put the black probe on one side on the fuse.
6) Put the red probe on the other side on the fuse.

If the fuse reads 0L, it is a bad fuse.

If F101 reads 0.8 ohms, it is probably a good fuse. If F301 reads 0L, it is a bad fuse.


Testing MOSFETs

http://ezinearticles.com/?MOSFET-Tes...res&id=2309124

Datasheet for your mosfet to id source, gate, and drain is at

http://www.alldatasheet.com/datashee...AP4511GED.html