Iiyama Prolite E481S zamiennik transformatora

Witam posiadam monitor Iiyama Prolite E481S którego zacząłem naprawiać. Po wymianie tranzystora STP9NK60ZFP i układu SG6841SZ zasilacz chce działać lecz na pinach transformatora po stronie gdzie ma 6 pinów nie ma napięcia i obstawiam przerwany obwód. Jaki zamiennik mogę kupić za niego? Transformator ma oznaczenie 80ll19t-3-t, a niżej daje zdjęcia

Testem diody wyszło tak na stronie pierwotnej 1 i 2 pin łączy się między sobą ale nie łączy się z 3,4,5 pinem które łączą się między sobą więc tutaj jest raczej dobrze, po stronie pierwotnej wszystkie 6 pinów łączy się między sobą. Nie próbowałem zwierać transoptora nigdy tego nie robiłem. Dlaczego na wtórnej stronie nie ma żadnego napięcia?

XTermiX napisal/-a:Testem diody wyszło tak na stronie pierwotnej 1 i 2 pin łączy się między sobą ale nie łączy się z 3,4,5 pinem które łączą się między sobą więc tutaj jest raczej dobrze, po stronie pierwotnej wszystkie 6 pinów łączy się między sobą.

That's completely normal, there are multiple windings inside that transformer (as illustrated in the following pictures).

XTermiX napisal/-a:Dlaczego na wtórnej stronie nie ma żadnego napięcia?

We're not clairvoyant here, so we can't know that without anything concrete measurements.

Perform the following measurements in reference to the "hot" ground. The "hot" ground is the negative (-) pin of the main 400V big electrolytic capacitor.
- Measure the resistance to ground on Source (S) pin of transistor STP9NK60ZFP.
- Measure the resistances to ground on pins 2, 3, 6, 7 of chip SG6841SZ.

- Measure the voltage to ground on pin 2 of transformer.
- Measure the voltages to ground on pins 3, 7 of chip SG6841SZ.

Be aware of high voltages.
Make sure to discharge the main 400V big electrolytic capacitor before handling the board.

Should I take the measurements when it's unplugged or plugged in? I have a resistor to discharge the capacitors so no worries

"- Measure the resistance to ground on Source (S) pin of transistor STP9NK60ZFP."
0.3Ω
"- Measure the resistances to ground on pins 2, 3, 6, 7 of chip SG6841SZ."
2 pin: 75KΩ
3 pin: 2.03MΩ
6 pin: 0.3Ω
7 pin 1.05MΩ
"- Measure the voltage to ground on pin 2 of transformer."
320V
"- Measure the voltages to ground on pins 3, 7 of chip SG6841SZ."
3 pin: 10,45V
7 pin: 6,76V

Measure the resistances between listed pins of chip SG6841SZ.
- Between pin 1 and pin 8.
- Between pin 7 and pin 8.

matic napisal/-a:Measure the resistances between listed pins of chip SG6841SZ.
- Between pin 1 and pin 8.
- Between pin 7 and pin 8.

- Between pin 1 and pin 8.
11.33kΩ
- Between pin 7 and pin 8.
13.18kΩ

Ktoś coś doradzi bo od dłuższego czasu cisza?

Do you have an oscilloscope?

Unfortunately, I don't have an oscilloscope

XTermiX napisal/-a:Po wymianie tranzystora STP9NK60ZFP i układu SG6841SZ

- Was that transistor and controller chip initially damaged?
- Was the electrolytic capacitors on the secondary side initially bulged?
- What was the initial state of this monitor?

matic napisal/-a:- Was that transistor and controller chip initially damaged?
- Was the electrolytic capacitors on the secondary side initially bulged?
- What was the initial state of this monitor?

- I bought it damaged to repair and use. After unscrewing, the first thing I saw was a blown fuse, then I started checking the transistor that the element tester showed as damaged and a short circuit on the capacitors that connected to the system.

- The capacitors on the secondary side are bulging but I'm going to check them soon

- I do not know the previous history of this monitor

matic napisal/-a:- Was the electrolytic capacitors on the secondary side initially bulged?

I checked all the capacitors with an element tester and they all seem to be in working order, all have low ESR below 1Ω and capacitance within 3% tolerance. I'm giving up, do you have any other ideas?

Ktoś ma jakiś pomysł co dalej?

XTermiX napisal/-a:After unscrewing, the first thing I saw was a blown fuse, then I started checking the transistor that the element tester showed as damaged

Which transistor was there originally and with which one you replaced it?

XTermiX napisal/-a:and a short circuit on the capacitors that connected to the system.

Which capacitors exactly do you mean?

matic napisal/-a:Which transistor was there originally and with which one you replaced it?

There is one transistor and I put the same one

matic napisal/-a:Which capacitors exactly do you mean?

SMD capacitors near this SG6841SZ

XTermiX napisal/-a:

matic napisal/-a:Which capacitors exactly do you mean?

SMD capacitors near this SG6841SZ

- Please, post a clear picture of the SG chip with a nearby surroundings and mark these capacitors in the picture.
- Is there still a short circuit on these capacitors after replacing the chip?