Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
[ATTACH]309456[/ATTACH] [ATTACH]309457[/ATTACH]
I have tested both the mosfets Q152 and Q154 and indeed the Source in conneted to ground and the Drain to the 12V rail.
I have only measured the mosfets in circuit so the readings on the pins are bit jumping arround. In diode mode i get 0,5V between S->D, about 20 KOHm between G and S (20K resistor) The rest of the measurements are jumping a bit, but no direct sign of shortcut...
Both the Gates are routed via a 0 Ohm and a parallel restistor...
Dynamite76
Member
Last Activity: 09-16-2023, 05:56 AM
Joined: 07-27-2023
Location: amsterdam
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I am still waiting for equipment to test the main caps... In relation to the 12V side, any input?...Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I have no output on the 12V rail... and I am not able to trace the root cause. I think the main circuit is working as it is also supplying power to the 5V circuit, which looks stable now. Unfortunately the ESR tester is on it way and has not arrived so I can not check the main caps. When I push power on button the relay is activated and voltage level at main supply goes up from 350 up to 390. On the 12v side I have measured at many points but there is no voltage level at all, also the 5V supply to various chips...Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Anybody can help me further, my options have stalled a bitLeave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Any hint to further troubleshoot would be welcome… I a bit clueless where to debug further… ear I will check once the meter has arrived…Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Supervisor readings are: pgi pgo 0V fpo and pson 5V when psu off all 0V when psu is on
So when the psu is turned on both fpo and pson drop from 5V to 0V for the rest no changes in value...Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
A “cheap” ERS tester is on its way…but it will take a couple of days to fly from China…. It the mean time I will focus on the rest of the circuit. At the high power side there is also this chip..? What does this chip do? Could not find a data sheet.
[ATTACH]308760[/ATTACH][ATTACH]308761[/ATTACH]
I was also trying to find any similar schematic but so far I was not successful…Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
A “cheap” ERS tester is on its way…but it will...Last edited by Dynamite76; 08-19-2023, 01:51 PM.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Supervisor readings are: pgi pgo 0V fpo and pson 5V when psu off all 0V when psu is offLeave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I have debugged further up to the Uc3895 chip where is see no voltage over the bed and grind pins… but I don't know where this vdd is coming from… traced it back to a transformer…[ATTACH]308688[/ATTACH] left one on this photoRe: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I have debugged further up to the Uc3895 chip where is see no voltage over the bed and grind pins… but I don't know where this vdd is coming from… traced it back to a transformer…[ATTACH]308688[/ATTACH] left one on this photo...Last edited by Dynamite76; 08-18-2023, 02:41 PM.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
One step forward the 5V circuit is now stable. If I push the on button the on board relay is switching. Unfortunately still no output on the 12v. The boosted power is rising from 350 when the psu is off up to about 390 when the psu is on. My “feeling” is that these main caps are still ok. But I know feeling does not rule out facts. But I would like to rule out some other things in the 12v circuit before touching the big boys. Any suggestions on how to trouble shoot for the next steps?Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Ok, thanks for the feedback. In the mean time I de-soldered the optocouplers on the feedback side, as in circuit they gave me some strange readings. But they are ok as far as I can measure. And while testing I found that one of the caps I replaced was shorted… there was a tiny little solder bridge between the cap pin and a nearby exposed line…. The devil is in the details. So once I put the optos back I will test it again and hope to have a more stable 5V without overheating and maybe more…Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
With the main circuit caps you mean the two big ones... 330 uF...?Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
In relation to the information provided above I have made some images and measurement for further debugging. Any input would be welcome.
First of all some photos of the complete PSU and some detailed shots:
Front of the Board [ATTACH]308462[/ATTACH] Back of the Board [ATTACH]308463[/ATTACH] Half of the back [ATTACH]308464[/ATTACH] Half of the back [ATTACH]308465[/ATTACH]
Half of the front [ATTACH]308466[/ATTACH] half of the front [ATTACH]308467[/ATTACH] Output strip of PSU [ATTACH]308468[/ATTACH]...Last edited by Dynamite76; 08-16-2023, 01:24 PM.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I will take some overview images later today. On the 5v side I had to replace the tny280 as it exploded, the zener diode next to it on the EN line was toast. Also I have replace a SMD cap and two reactors feeding the 5V circuit. After replacing these components I got 5V back again. But not sure if every is ok with this circuit now… the value of the smd cap is a bit depending if the measurements on the old cap where accurate.
Here are some detailed pictures I have on my phone. Other pictures I will share this...Last edited by Dynamite76; 08-16-2023, 05:47 AM.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
On the output of the PSU I measure 4.98 on the +5V line 0.09V on the -12V 0V on the FAN Ctl and POU line 4.98V on PSU ON 0V on the alert and 4.985 on the PSA A1 and 0V on the PSA A2 line when I turn the PSU ON the PSU ON is (obvious) 0V and the alert rises to 4.98 V.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
The supervisor chip is a dwa 103n-anp. When I manually switch the psu on I get an error signal from the supervisor. It also looks when I turn the psu on the tny280 is running hot…? When I push the button I hear a very soft noise.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I have replaced some caps and the zener diode which was also blown. Now i have 5v on the output but yet no 12v and no green diagnostic light. Any suggestion how to troubleshoot this psu any further?Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Is the value of the cap near the resistor critical or do I have some freedom to choose. As I don't have a wide range available and should or one. Even then a suggestion for the value would be helpful as the reading on the cap are a bit unstable.Leave a comment:
-
Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
I have a bit of update on the problem as mentioned above. I have replaced the resistors with two resistors of each 100 Ohm in parallel.
Now I have the main voltage level over the S->D pins, about 5.82V over the BP/M -> S pins and almost 0V over the EN/UV ->S pins. At the 5V side of the transformer I measure approx. 3.2V over the diode. At the 5V outlet I measure about 1V.
The CAP near the two blown resistors also got an impact. I desoldered this cap but is was not shorted and gave some...Leave a comment:
-
Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN
Recently I got a DELL PSU from a presision T3600. It is a 635W PSU which went out with a bang and some black smoke
. The model of the PSU is a D635EF made by DELTA.
The cause of the bang was a blown. TNY280PN Chip. How ever as a result or as a causo also two SMD resistors are smoked. I have been able to replace the TNY280 Chip but I do not know the values of the resistors. The resistors are within the Drain line of the TNY. I can not find the schematic of this PSU. THe resistor are Open Loop and on the voltage accross them is about 330V. (EU)
Any suggestions for...Last edited by Dynamite76; 07-27-2023, 02:46 PM.
No activity results to display
Leave a comment: