Question about Compaq 175w Power Supply - Pdp117p Pdp117p

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No power out

The power has been conected but the power supply doesnt show any voltaje in the outputs

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The output voltage is 101 volt between la y n, I expeccted 120 volt


There`s two configurations that you need to check.
On UPS display, what voltaje is showing as output voltage?
There`s a chance that it is configured to 200 vac, then the transformer module will convert this to 100/200 vac.
If this is not the situation, probably the error is in the input connection of transformer module.

Sep 09, 2015 | Eaton MGE O.P.S. EX RT - UPS - 8 kW -...

1 Answer

Hello, I am trying to fix the monitor LG L1951s that does not power on, I found the 68uF*450V capacitor bad, replaced this one but problem ramains. I have measured most of the componets on the power board...


The 68UF 450 is for the primay smps driving side, are you getting about 160vdc on that cap?
The PWM IC get the kick start DC voltage from the main bridge rectifier thorough a bunch of high resistance resistor to drop the 160vdc down to aboit 15vdc, once the PWM IC start working, one the winding will be the supplying the voltage to the IC to keep it running. If the DC output side detect short cirsuits (drawing too much current) it will go into shutdown, you need to find out if the inverter circuits has short circuits. The 5vdc and the 12~18vdc power supply will be running the minute you plug it in, you can solder in a 12v bulb at the DC output that feeds the inverter circuits (you can solder it directly on the DC filter caps for the 12~18 VDC filter caps of the inverter circuits). See application notes how this IC is used.
http://www.fairchildsemi.com/an/AN/AN-4129.pdf
http://www.fairchildsemi.com/ds/FA%2FFAN7601.pdf

No blown MOSFET on the primay side?
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Aug 21, 2010 | LG L1951S-SN (Silver, Black) (Black,...

1 Answer

Shut downs suddenly


This may due to faulty power supply. Check the output of the power supply, change or repair the same will solve your problem.

Dec 08, 2009 | Computers & Internet

1 Answer

Power button


pls check the horizontal output remove the center ic leg (c) mesure the voltaje must 100 to 130 if you can get this voltej consider your supply ok try to replace your horizontal output ic

Jun 06, 2009 | JVC AV-27020 TV

1 Answer

TV RCA THOMSON 27R411T CHASSIS ITC008FHM


Try replacing the eprom. If that somehow became corrupted due to HV surge or otherwise, you would have this symtom. The eprom contains information that basacally tells the HV circuit to turn on.

Apr 06, 2009 | RCA 27R411T 27" TV

2 Answers

Computer monitor


I have never tried that but I would say it won't work that way. I have 2 display cards (3 outputs each, VGA, DVI, TVout) and 3 monitors. When I check the driver software and multiple screen function, it shows only 2 output (VGA and DVI) each. I cannot set TV output as a second screen. Even display properties on windows, it shows only available monitor output. I don't think you can do that.
Thank you,
Tan

Mar 05, 2008 | Dell E153FPc 15" TFT LCD Flat Panel...

5 Answers

BenQ FP51g LCD monitor


Dear Friend:
There is a Switch transistor to power on -off the hi voltaje for lights. Check 15V from power source go to this transistor colector, Using soldering Iron, make a juntion between colector and emiter, to short 15V to Hi voltaje power. I´m fixing 10 monitor the same trouble. I will remove a liter transistor.
Late I will post here the driver transistor number, and the replace number transistor I will use.
Pictures , etc. Best Regard

Feb 16, 2008 | Proview PL713S 17" Flat Panel LCD Monitor

1 Answer

Will not come on


IS good you have some indication of power,that means some of the volts supplies are working,if you are familiar with tv service you can check for loose conections in the horizontal drive and output circuits,this circuits energize the output transformer and he provides more volts supplies,if the output transistor is bad(shorted) is likely it damage the fusible resistor too.You might have to do some measurements and soldering.If you are not too familiar with tv service be safe and call for assistance from a servicer.

Oct 11, 2006 | Hitachi 46F500 46" Rear Projection...

3 Answers

When it's turned on, the light on my monitor doesnt show any signal of power supply


I'm assuming that you mean the green indicator light is not on. This could be caused by a host of problems. Assuming that you know the AC receptacle is live by testing with a standard light the next step would be to unplug the unit and remove the back. Check the fuse for continuity. If the fuse is good you have a problem with the power supply or a short which is keeping the power supply from powering up. The most likely culprit is the Horizontal Output Transistor. Unless you are an electronic tech and know how to check this you probably need to take the unit to a shop for further diagnostics and repair.

Jun 22, 2006 | Samsung SyncMaster 753S 17" CRT Monitor

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