DELIUM Vw19B

[smurtz]

Hi,

I got this 19" screen last week and it has the "2 seconds to black" trouble.

Although the caps seemed visually ok, ordered new ones from radiospares and should receive them next week.

I did a search on badcaps.net & it returned nothing (I guess the main reason is not that this brand works better than the others but is certainly less bought )
Did anybody here came across this brand before ?

Smurtz

[selldoor]

Re: DELIUM Vw19B

Something your not telling us? this power supply has already been worked on the caps have long legs on the back and they have probably shorted out on the frame?
Please supply more info regarding this.
What caps have you ordered they NEED to be low esr for this application.

[smurtz]

Re: DELIUM Vw19B

yes sorry about that, the long legged caps are the ones I had available and are the ones I already changed.

these are NRSZ series caps.

[selldoor]

Re: DELIUM Vw19B

I have not heard of them but one established member says he has used them and they are ok. You should get them as near the board as you can - first thing I noticed they were stepped up. Perhaps the distance between the legs is less than the originals in which case you have done the best you can. You really need to be careful though with the uncut legs.

It is Philips Board number will be IlPI something?? 68??

I have not read your previous posts but if you have not read it you should read this
by retiredcaps - It has lots of tests you can do without the power on. I would do the test on the Inverter Transformers early on. Start at post 19
https://www.badcaps.net/forum/showthread.php?t=10419

[smurtz]

Re: DELIUM Vw19B

Yes it's written ILPI-068 REV:A

I didn't know it was necessary to get them as close as possible from the pcb, is it to avoid shorts ?

Thanks for the link, I'm going to have a try with the transformers test.

[Th3_uN1Qu3]

Re: DELIUM Vw19B

I didn't know it was necessary to get them as close as possible from the pcb, is it to avoid shorts ?

No, it's to minimize the impedance of the capacitors, which is important in switchmode power supplies. When working at high frequencies, you need to think of any length of wire as a coil (inductor). The longer the leads, the more trouble they can make.

[jetadm123]

Re: DELIUM Vw19B

I've used NRSZ series caps before. They're a good quality low-esr cap made by a small japanese company called NIC components.

Does the power led stay on even when you the screen goes black? Have tried measuring for voltages at the wiring harness for the power supply?

[smurtz]

Re: DELIUM Vw19B

No, it's to minimize the impedance of the capacitors,

Thanks for the infos !

@jetadm123: When the screen goes black the power led switches off.


I used my fluke to check the two tranformers:

T501:
1 -> 2 0,19 Ohms
1 -> 3 0,37 Ohms
1 -> 4 0,26 Ohms
1 -> 5 0,44 Ohms
1 -> 6 0,42 Ohms
2 -> 3 0,40 Ohms
2 -> 4 0,21 Ohms
2 -> 5 0,45 Ohms
2 -> 6 0,45 Ohms
3 -> 4 0,35 Ohms
3 -> 5 0,36 Ohms
3 -> 6 0,22 Ohms
4 -> 5 0,36 Ohms
4 -> 6 0,36 Ohms
5 -> 6 0,21 Ohms

Between A & B : 0,48k Ohms

T502:
1 -> 2 0,21 Ohms
1 -> 3 0,26 Ohms
1 -> 4 0,26 Ohms
1 -> 5 0,26 Ohms
1 -> 6 0,26 Ohms
2 -> 3 0,22 Ohms
2 -> 4 0,26 Ohms
2 -> 5 0,25 Ohms
2 -> 6 0,25 Ohms
3 -> 4 0,18 Ohms
3 -> 5 0,22 Ohms
3 -> 6 0,22 Ohms
4 -> 5 0,26 Ohms
4 -> 6 0,26 Ohms
5 -> 6 0,20 Ohms

Between A & B : 0,48k Ohms

I guess T501 is dead ?

[selldoor]

Re: DELIUM Vw19B

I dont think that will be correct see attached and meter on ohms2000 test
S1> S2 and S3> S4

[smurtz]

Re: DELIUM Vw19B

The meter gives:

S1 > S2 : 0,481K Ohms
S3 > S4 : 0,483K Ohms

[budm]

Re: DELIUM Vw19B

480 Ohms may be correct for this size transformer.
I think th key word is this statement:"@jetadm123: When the screen goes black the power led switches off"

[retiredcaps]

Re: DELIUM Vw19B

@jetadm123: When the screen goes black the power led switches off.

If the power LED goes off, it could be because the power supply shutdown or there is a problem on the main board. The main board controls the power LED, but main board needs power to work (namely 5V standby).

I used my fluke to check the two tranformers:

One retiredcaps bonus point for a picture of your Fluke 189.

I guess T501 is dead ?

The reading suggest T501 is good. The rule of thumb is that both readings show be within 3% of each other.

On your main board, there are two voltage regulators: U101 and U102. After the power LED goes off, measure U101 and U102 and report your findings. See my sig file on how to measure them.

PS. Those are good focused pictures.

[selldoor]

Re: DELIUM Vw19B

Does the power led stay on even when you the screen goes black? Have tried measuring for voltages at the wiring harness for the power supply?

He is waiting for caps to be delivered and fitted so I didnt suggest this. I was only asking him to do non-voltage tests

I notice a small orange fuse, probably ok but please check it. should be 1 ohm or less.

[smurtz]

Re: DELIUM Vw19B

ok, I received the caps & changed them.

I still have the 2 seconds to black, but now the led switches to standby and stays orange.

Once in standby I measured U101 & U102:

U101 
LD1117A - L33AUL
1 : 0
2 : 3,30V
3 : 4,98V

U102
LD1117A - L18AUM
1 0
2 1,79V
3 4,29V

And CN801

CN801:
1 (VCC5V) 5V 
2 (VCC5V) 5V
3 (GND)  0
4 (GND)  0
5 (ON/OFF) 0,06V
6 (BRIGHTNESS) 0
7 (VOLUME) 4,64V
8 (MUTE) 0,07V

the orange fuse reads 0,29Ohms

[retiredcaps]

Re: DELIUM Vw19B

I still have the 2 seconds to black, but now the led switches to standby and stays orange.

Okay, that is a step forward.

2 seconds to black can be

a) bad caps
b) bad ccfls
c) bad ccfl wiring (especially the return wiring)
d) bad secondary windings on the inverter transformer

More details starting with post #19 at

https://www.badcaps.net/forum/showthread.php?t=10419

Also, see budm's Inverter tester using old CFL

https://www.badcaps.net/forum/showthread.php?t=19987

Once in standby I measured U101 & U102:

U101 
LD1117A - L33AUL
1 : 0
2 : 3,30V
3 : 4,98V

U102
LD1117A - L18AUM
1 0
2 1,79V
3 4,29V

Your regulators are good.

And CN801

CN801:
1 (VCC5V) 5V 
2 (VCC5V) 5V
3 (GND)  0
4 (GND)  0
5 (ON/OFF) 0,06V
6 (BRIGHTNESS) 0
7 (VOLUME) 4,64V
8 (MUTE) 0,07V

the orange fuse reads 0,29Ohms

Try measuring pin 5 as soon as you apply power. It helps to have the probes in place and then hit a switch on the power bar.

[smurtz]

Re: DELIUM Vw19B

I have an old 15W CFL (50Hz 110mA), should I try ? (despite the fact that the post talks about a 14W CFL)

Thanks

[Th3_uN1Qu3]

Re: DELIUM Vw19B

Yes you can use that.