ilo V27DMBX totally dead. no light on the front or anything. On the power supply I found 2 bad mosfets and the main cap was bad so replaced all those and the blown fuse. Same thing all dead. No caps are swollen and I replaced what I think was the start up cap and still totally dead. I have zero volts at all the pins on the connector. I know there must be an open someplace I think. I just can't find any info on this and there is no voltages printed on the board next to the plug so no clue what is to be there. The board is PN 6693006602
ilo V27DMBX dead totally
Collapse
X
-
Re: ilo V27DMBX dead totally
Can you post a picture of the bottom of the Power board - which cap did you think was the start up. C26? Can you have only the power supply connected and check the connector that goes to the main board for 5v standby? Have you checked diodes and resistors for open?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: ilo V27DMBX dead totally
last pic is not really clear enough for troubleshooting - perhaps try in 2 halves
are the 4 black dots in a row the bridge rectifier? I usually try and find that to get my bearingsPlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: ilo V27DMBX dead totally
So which two MOSFETs did you replace? The two next to each other are for driving the main transformer, the one by itself is for the PFC Voltage booster.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: ilo V27DMBX dead totally
Hi
Pics are a little better here is a sort of schematic
In with the group of secondary capacitors there is an inductor L2 can you test it for continuity.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: ilo V27DMBX dead totally
Picture in post 2, it looks like one of the resistor (<1 Ohm) is for the Source pin and primary Ground (Negative leg of the main cap), and another resistor (in 1000'S of Ohms) is part of the snubber circuit.
Can you show the picture of the two resistors with the shrink tubing removed? Also the MOSFET for the PFC, when it shorted out it may have taken out the PFC IC also.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
Related Topics
Collapse
-
by badboyzzzThere is a problem with nvidia shield 2019 p2897. The lights of the device are on but there is no voltage in the red marked areas. The green areas are normal and the chip in the yellow area is heating up in long-term voltage. Does anyone have a diagram or an idea? Thanks in advance
... -
by Mike RussellMachine won't power on, no power led, no fan spin, completely dead.
Checked PQ5400 - AONS32314 and pins 5,6,7,8 are 20v (AC adaptor voltage) but pins 1, 2, 3, 4 are 0v.
Following Gate Pin 4 to PU5400 - BQ24780SRUYR.
VCC 20v
ACDET 2.8v
ACDRV 0v (goes to pin 4 gate of AONS32314).
ACOK 0v
REGN 6v
According to datasheet, conditions are correct for ACOK to be high but it is not.
Tracing ACOK it's connected to ACIN which is connected to a pin GPB0 of IT8227 but also shown as connected to +3VL via a 100k resistor... -
by phantomEVOhi to all! please help with 2 imac 21,5 dead...
i already changed u7700 in both without luck
u7700 pin 17, 18, 5, 4, 24, 12
have those voltages in both imac..
12v, 5v, 5v, 5v, 0,3v, 3,9v
i have 3V3_S5 (L7710) in one imac (one led) but no 5v on L7750
NO SHORT ON L7750
i have not 3V3_S5 (L7710) in the other (no led)
PLEASE HELP I'M GOING CRAZY!!01-25-2024, 01:46 PM -
by pixellegolasHi!
I have this laptop and first let's go through what happened
Went totally dead, no reaction
I thought it was the adapter so I bought a new one = nothing happened
Opened up the laptop and adjusted the battery cable = Started working
Worked a couple of days and then went totally dead again
Now nothing works
I have opened the laptop, removed basically all removable components. It does not start without the battery or harddrive or anything disconnected.
Testing with voltmeter I can see 5.3V basically... -
by double_DDHi all,
As the title suggests, how can I be sure that my EC chip is really dead?
I've recently gotten into this hobby of laptop repairs, and have successfully brought back to life a couple with some easy fixes, mostly shorted caps.
Now I'm working on HP Probook 455 G8, that had some "devil" run around on 3V line, burning a bunch of stuff. Luckily I have a dead 455G7 (for spare parts) so I managed to fix it (swapped burned parts) to a point that it will charge (both on barrel jack and usb-c), but it doesn't want to turn on. There is a 3V3 on a keyboard... - Loading...
- No more items.
Comment