Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

[badcapass]

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Hi,

I have problems with a already totally recaped PSM217-404-H-R used in HG281D, HSG1040, VX2835WM, ... Since the rest of the TFT runs fine (with another power supply), the power supply doesn't wake up from standby, there is no voltage on the secondary side (just stand by 'SB+5V'). Even if the monitor is connected to main board and power button pressed, neither standby SB+5V is direct wired to power switch on 'PSON'. Just voltage on main cap (C3 150muF/420V) drops from 320 to 318 volts. TFT reacts on power button, but the blue LED is just blinking or went off. More details:

used caps:

Nr.	[muF]	[V]
--------------------
C3	150	420
C203	2,2	50
C205	1,0	50
C108	10	35
C111	22	35
C114	2,2	50
C403	470	35
C406	10	50
C601	22	400
C603	22	35
C606	1,0	100
C605	47	50
C701	1000	10
C707	22	35
C301	1000	25
C302	1000	25
C306	470	25
C401	1000	35
C502	470	35
C505	1000	10
C506	470	10
C702	470	10

measured voltages:

issue		standby	/ "on"
------------------------------
C3		320V	/ 318V
blue LED	off	/ blinking
orange LED	off	/ off
Q202 pin i/1	1V	/ ~1V
Q202 pin i/2	0V	/ 0V
Q202 pin i/3	0V	/ 0,4V
Q601 pin i/1	20V	/ ~0,3V
Q601 pin i/2	0V	/ 0V
Q601 pin i/3	22V	/ ~1V

Q501 and Q502 are dead, nothing measured there.

Would be great if anyone has an hint or idea! Thanks and regards
Paul

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[Pentium4]

Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

Q501 and Q502 are dead as in no voltage or they are shorted?

[badcapass]

Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

Hi,

dead in the meaning of no voltage (just some fluctuating mV). They actually look better then Q602. If they would be blown up at least I had something to start with.
Are there any check points on the board? (Uhh, I realy thought they spent some effort for fixing this easier...)

Regards

[canadaboy25]

Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

Do you get anything on the display ever?

canadaboy25

[badcapass]

Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

Hi,

I get some fluctuating mV at Q502 and Q502, thats all.
I am concerned about Q601, because voltage drops from ~20V to 1V after powering on.

Regards

[ruffy91]

Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

How does the Q601 call?
on my board is this IC a little bit dark.
i want to change the IC

[selldoor]

Re: Power Supply PSM217-404-H-R (HG281D, HSG1040, VX2835WM) doesn't wake up

Hi - I have spent many hours looking for this item - can you clean it with some
Isopropyl Alcohol on a qtip and check with a magnifying glass fro any part number
- may be letters.