Samsung SyncMaster B2330 Black screen

[tama4tama]

Dear friends,
This monitor came in this morning with no power. This is Samsung SyncMaster B2330; I have checked the fuse and others things all look fine no bad capacitors.
I have checked the voltage going to the signal card CN802 but all comes out 0.00V that show that there is voltage going there. The IC871 and F911S all are fine.
Please help me on this one?
I appreciate all your kind help.
Thanks.

Tama

[PlainBill]

Re: Samsung SyncMaster B2330 Black screen

Dear friends,
This monitor came in this morning with no power. This is Samsung SyncMaster B2330; I have checked the fuse and others things all look fine no bad capacitors.
I have checked the voltage going to the signal card CN802 but all comes out 0.00V that show that there is voltage going there. The IC871 and F911S all are fine.
Please help me on this one?
I appreciate all your kind help.
Thanks.

Tama

First of all, while the pictures are fairly good, there is one mistake that makes things more difficult than necessary. This board has a strong orientation -when the CCFL connectors are toward the top of the picture the component identifiers are all right side up. While I can read upside-down, it's not something I prefer to do.

Now onto the real problem.

1. What is the voltage across the large cap?

2. There is a large heat sink at the top of the picture. The IC on that heat sink is the SMPS controller. What is the part number?

PlainBill

[tama4tama]

Re: Samsung SyncMaster B2330 Black screen

PlainBill, I am very sorry for that picture which was upside-down.

The voltage across the large capacitor is 321.9V

The IC has this part number DA 29CK and GMO 565R

Tama

[selldoor]

Re: Samsung SyncMaster B2330 Black screen

How old is this monitor Samsung monitors have a 3 year warranty?
http://www.samsung.com/africa_en/sup...OLICY.WARRANTY

[tama4tama]

Re: Samsung SyncMaster B2330 Black screen

Just less done a year.

[PlainBill]

Re: Samsung SyncMaster B2330 Black screen

PlainBill, I am very sorry for that picture which was upside-down.

The voltage across the large capacitor is 321.9V

The IC has this part number DA 29CK and GMO 565R

Tama

That voltage is good. Unfortunately I can't find any reference to the part numbers of the SMPS controller.

PlainBill

[selldoor]

Re: Samsung SyncMaster B2330 Black screen

Could it be DMO565R

http://www.scribd.com/doc/38843138/Datasheet-DMO565R



NO PROBABLY NOT SEE NEXT POST

[selldoor]

Re: Samsung SyncMaster B2330 Black screen

Think it is this? its a zero not an oh

http://www.fairchildsemi.com/pf/FS/FSGM0565R.html

[retiredcaps]

Re: Samsung SyncMaster B2330 Black screen

Think it is this? its a zero not an oh

This post below doesn't help out the OP, but speaking of mixing up "0" and "O" ...

https://www.badcaps.net/forum/showthread.php?p=213475

[retiredcaps]

Re: Samsung SyncMaster B2330 Black screen

Now for some real technical help.

Pin 3 is Vcc. Pin 2 is GND.

According to the datasheet, when Vcc reaches 12V DC, it will start. What DC voltage reading do you get on pin 3 (with pin 2 for ground)?

[tama4tama]

Re: Samsung SyncMaster B2330 Black screen

Thank you, PlainBill, Selldoor and Retiredcaps, I am sending the picture of the IC

tama

[PlainBill]

Re: Samsung SyncMaster B2330 Black screen

To add a little bit to retiredcaps post, using pin 2 of the IC as ground, CAREFULLY measure the voltages on pins 3 and 6. Pin 3 is Vcc, pin 6 is the source for the startup voltage. the pins are numbered 1 - 6 from left to right,

PlainBill

[tama4tama]

Re: Samsung SyncMaster B2330 Black screen

These are voltages I got on pins 3, was 238v and 6, and was 230v. Is that correct?

Tama

[PlainBill]

Re: Samsung SyncMaster B2330 Black screen

These are voltages I got on pins 3, was 238v and 6, and was 230v. Is that correct?

Tama

Those numbers don't look right. Verify the voltage on pin 3. I've attached a picture.

PlainBill

[retiredcaps]

Re: Samsung SyncMaster B2330 Black screen

These are voltages I got on pins 3, was 238v and 6, and was 230v. Is that correct?

If pin 3 was really 238V DC, that would be one cripsy chip.

Pin 3 maximum is 26V.

[tama4tama]

Re: Samsung SyncMaster B2330 Black screen

I have done the measuring all over again and it seem that the IC is bad with according to the datasheet , this morning It read 5.9v on the pin 3 and pin 6 was generating high voltage.

Tama

[PlainBill]

Re: Samsung SyncMaster B2330 Black screen

I have done the measuring all over again and it seem that the IC is bad with according to the datasheet , this morning It read 5.9v on the pin 3 and pin 6 was generating high voltage.

Tama

It's probably a translation problem, but there is one slight error in that statement. The IC receives high voltage on pin 6, and is supposed to reduce it to about 12-20 volts for Vcc.

The failure of Vcc to rise to the start voltage is is a common failure mode, replace the FSGM0565R. You may have to use the earlier version, it can be found on eBay as DM0565R

PlainBill

[tama4tama]

Re: Samsung SyncMaster B2330 Black screen

Thank you all for your help to see that this monitor came back to life. As soon as I get part and fix it, I will let you known the out came.

Tama

[VaNDAL_UK]

Re: Samsung SyncMaster B2330 Black screen

Any news on the out come?

I'm picking up one of these monitors on Monday repoted as no power issue.

[malexry]

Re: Samsung SyncMaster B2330 Black screen

I have the same b2330 as you, and I have uploaded pictures of the circuit board. 2 days ago it went out randomly and when I turn on the monitor it makes a hissing sound and then shuts off after about 2 seconds. I have no blown capacitors and I do not really know much about circuitry and such but if anyone can help me with this problem that would be great! also one more thing to throw everyone off, like 1 out of 200 tries the monitor will actualy stay on! the pixels always are on it is the black light that stays on 1/200 times. why I have no idea! but if I turn it on and off for like 30 mins the monitor will work completely fine until I turn it off, it goes to sleep, ect. so if anyone can figure this one out id be happy! also the monitor is significantly dimmer than my other monitors and that might have something to do with it as well.

ps: when I say the monitor "shuts off" or "goes out" its the back light, I did the flashlight test and I saw the image on the monitor BEARLY! but I did see them.

also sorry for bump, I just really need this solved