Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

[ryankam]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

Definitely a dual supply, and it looks like a PFC front end may be present.

Two questions come to mind.

1. What caps (brand and series) were used as replacements?
--Caps Are Samxon 35v 1000uf caps. The main one which the user did not see popping is capxon and there is one more capxon that looks to have not been replaced.

2. The picture of the bottom of the power supply is useless, the top is much better, but still falls a little short. There appear to be two output connectors. Are the pins of those connectors labeled? 6.2V is an unusual output voltage.
--Ya I only put the bottom of the supply because I see others post that way sometimes I always thought it was useless too. If need be I can get out the big boy and take a highdef pic. But I dont know if there servers can handle that. It was already giving me trouble uploading with an iphone pic. I agree 6.2v is odd but there is a sticker on the top of a covered transformer that reads:
24V 3A
13V .5A
5.4V 3.5A
6.2V 1.0

And that 6.2v is on the 3 pin (Only get 2.62V) connector which reads. On/off | Gnd | 6.2V

The other large connector looks like it is just passing voltage over to the inverter throught the logic board.And that is where the 13V/24V/5V writings are on the board.


PlainBill

sss

[ryankam]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

SeanC - The logic board says 244T on it by the way I just noticed it.

1) On larger sized monitors, there are usually two power supplies. One is the 5V standby, and the other is the normal SMPS with optional PFC.

--Just one in this monitor. I have only seen two in plasma tv's.

2) Please attach a picture of the logic board.

--- Pic of logic attached and pic of power/logic attached. This is all thats under the hood besides inverter and tcon.

3) Please verify that 5V DC standby is present and showing steady voltage.
--- I wish I could get the 5V DC but that is the whole problem I am not getting 5 I am supposed to get 6.2 according to the board markings but I get around 2.3V.


4) List any voltages on the logic card connector. In particular, see if the voltage regulators are working properly. If the voltage regulator is part number AL1117-33, the suffix, implies the output voltage. In this example, it would be 3.3V DC.
---Voltage Reg is: 1501-33. I tested all pins to ground. 0.00V. But I expected this since im getting nothing from secondary.


5) If this SMPS has a PFC, the voltage across the main cap should be around the 300V DC range.

-158.2 is across main cap.

[ryankam]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

Google says that PSU is in a Samsung 244T

hey sean thanks again. I looked at that monitor on google and it looks dead onto the monitor I have. But this one is branded SUN. So thanks now I know where I can find another supply if this is bad to the point of no repair. Thanks bud.

[PlainBill]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

Definitely a dual supply, and it looks like a PFC front end may be present.

Two questions come to mind.

1. What caps (brand and series) were used as replacements?

2. The picture of the bottom of the power supply is useless, the top is much better, but still falls a little short. There appear to be two output connectors. Are the pins of those connectors labeled? 6.2V is an unusual output voltage.

PlainBill

[retiredcaps]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

The main cap gives me 167V

1) On larger sized monitors, there are usually two power supplies. One is the 5V standby, and the other is the normal SMPS with optional PFC.

2) Please attach a picture of the logic board.

3) Please verify that 5V DC standby is present and showing steady voltage.

4) List any voltages on the logic card connector. In particular, see if the voltage regulators are working properly. If the voltage regulator is part number AL1117-33, the suffix, implies the output voltage. In this example, it would be 3.3V DC.

5) If this SMPS has a PFC, the voltage across the main cap should be around the 300V DC range.

[seanc]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

Google says that PSU is in a Samsung 244T

[ryankam]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

If the customer replaced the caps, then why does that still look like the factory glue still all over them?

Looks are deceiving in pictures.

I found a model number for the board: pslf101401a

[ryankam]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

If you notice the glue has two points of contact. One is supposed to be on the cap the other is on what ever else. The glue is not touching any of the caps, they just didnt remove it. Any technical information is helpful. Thanks though sean.

[seanc]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

If the customer replaced the caps, then why does that still look like the factory glue still all over them?

[ryankam]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

Thanks retired caps you had to give me about 30 more seconds the server kept telling me there was a security token error contact admin. I just resized images and now it works. Haha!

[retiredcaps]

Re: Sun LCD (Samsung BR24CS) 24.1" - 2.3v Instead Of 6.2v Secondary

We always want to see clear focused pictures of the boards using the manage attachments (see my sig file below) so we know what we are dealing with and can suggest test points.

[ryankam]

Hello All,
I have a power supply from this monitor that is giving me only 2.3V instead of the 6.2V listed on the board secondary. All the caps were replaced by the customer so I have no clue what the original sizes or voltages should have been but he said he kept all the voltages the same or increased them and the uF were the same so I have to take his word for it. Anyhow the PWM is a FSDM0565RB and I did some voltage tests on it but am not sure if that would determine if anything was shorted or not. I get 11.23v on the VCC pin and 1V on the Vfb pin. The main cap gives me 167V and I have checked all fuses. Bridge Rectifiers are fine. Varistors/Thermistors seem ok. Just stumpped as to why the secondary would not give me full power. I suspect the FSDM0565RB is the cause but not sure or if there is a bad resistor/ cap somewhere. I have no esr meter to test caps but like I said they are replaced. The resistors and diodes are all within specs. I only tested the ones within the vacinity of the PWM and near the Main power and all seem fine. Any input would be great. Board says it is a kinari24 which I cant find anywhere.