Question about SAMTRON 55V 15" CRT Monitor

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Set dead no smps starts but 300v dc supply is ok and ground to filter capacitor positive termial 145 v is ok but no dc volts in out put

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  • ronnel Mar 03, 2008

    my samsung samtron 553 is when you turn it ON,the LED will light then it will sond shsssssss then it will turn of


3 Answers

All the dc voltage out from sm but monitor not on

Posted on Feb 12, 2008

All the dc voltage out from sm but monitor not on

Posted on Feb 12, 2008

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Try replacing the filter capacitor of the PWM ic. 47uF-50v.

Posted on Feb 07, 2008

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Viewsonic VX924 monitor SMPS failed. Replaced all bad capacitors and have found that one pair of inverter driver transistors has failed. They are marked as DKQR (They are apparently Rohm 2SC4672...

When the DC filter caps no longer filter out high frequency AC, that AC will be fed through out the circuits and cause damages such as the inverter frequency will be running at the wrong frequency and caused overheating.
The service manual does not show the sch of the power supply/inverter board because it is not designed by Viewsonic.

Mar 27, 2011 | ViewSonic VX924 19" LCD Monitor

1 Answer

BACK POWER SUPPLY HI 1000V smps not work

How do the DC filter caps tested out to be? any leaking/bulging tops or have high ESR?
Need to verify that the 12vdc is fedding the inverter circuits first.

Basic LCD monitor troubleshooting guide:

Failed TV and Monitors:
Capacitors kit: he can make you a set of caps for you.
Please post back what you find.

Oct 01, 2010 | ViewSonic VA1703wb Monitor

2 Answers

I bought an LCD Monitor Model AL1916W,Acer. It was working good and for my job it was excellent.However, yesterday without any other problem the screen went to white.Power button went red.I closed and open...

christidis d, If AL1916W has white screen when connected to a "known-good" pc, then the units "switch-mode-power-supply" has gone bad. Most monitors have +5 volts and +12volts dc to power up the electronics. +12v for the inverter circuit which lights-up the 2 cold cathode fluorescent lamps, and +5v for the vga to lcd panel digital signal processing board. One or both of dc rails may be out of regulation and or a bit "noisey" due to failed "electrolytic filter capacitors" on the SMPS board. Let me know the brand name of the capacitors you find on the SMPS board. What is the "date of manufacture" on rear of monitor?

Sep 08, 2010 | Acer AL1916W 19" LCD Monitor

1 Answer

Lock problem

jayarajh, If pc is ok with different monitor, then first place I would investigate would be the internal switch-mode-power-supply of the E228WFP!!! If the DC voltage supply has become "noisey" because of failed electrolytic filter capacitors inside the unit, you may have this type of symptom. Please visit YOUTUBE for video clips on DIY smps power supply repair for ccfl back-lit lcd montors. Do your research first, then come back here and rate this response on fixya. Do some reading in my fixya profile for more info. 12fixlouie

Jul 21, 2010 | Dell E228WFP LCD Monitor

1 Answer

Can i get a copy of the power supply diagram for samsung 204B syncmaster ,i replaced the capacitors that were inflated in the power supply and in the inverter but the backlight not turn on. i want to know...

jose54tony, Schematics would only be available from Samsung. Rarely do they let them out of there tight grip!! You may need to look at the smps board and inverter board to find bad transistors that may have also died (muerto) when the electrolytic filter capacitors failed. 12fixlouie

May 20, 2010 | Samsung SyncMaster 204B 20.1" LCD Monitor

2 Answers

What kind of capacitor does a samsung 906bw lcd monitor use? I saw two bad capacitor at the power supply both are 10v 1000uf (105 degrees C)

There capacitors would most likely be electrolytic type. They are polarized capacitors and used for filtering DC voltage supply to remove the ripply and smooth the DC power.
If you cannot get a 10 volt capacitor then you can use a higher voltage type provided it can fit on the circuit board.

Mar 29, 2010 | Samsung 906BW LCD Monitor

1 Answer

No display flashing power button

savato321, Most black screen lcd monitor owners don't have the smarts to open up their monitors to do a VISUAL inspection of the "switch-mode-power-supply/inverter supply!!!! You're good. Now you will need to know some stuff about electrolytic filter capacitors! First, the "uf" or "UF" means micro-farad! It is just a rating given to express the storage capacity of the device. Next is the voltage rating. A 16v rating means that the capacitor should never be placed in a circuit where the voltage will exceed 10 to 12 volts DC. Your 820 uf cap rated at 25volts will most likely be in a 12 to 18volt dc circuit. Now for temperature rating. All caps have a maximum temp rating. Most clock radios, stereos, will use 85 degree centegrade rated caps. Printers,PCs,monitors, will use 105 degree C rated capacitors. Never replace with lower specification units! You can GO up but never DOWN. If 1000uf 25v is all you can get it's OK. If you can get 820uf 35v units and they are not too big and they will fit on the board sure you can use them. I would stick with the OEM design voltage rating. Electrolytic CAPS are polarized!! You must replace them + to + and - to -!!! If you screw -up they will blow-up!! The wire lead closest to the printed STRIPE on the cap will be the negative and the unmarked terminal will be the positive. If you visit you will get more info on recapping your SMPS. You can also watch some DIY videos at YOUTUBE for "lcd monitor repair" that might be helpful. Also visually inspect the SMPS/inverter printed circuit board for "COLD" FROSTY looking solder joints. They should all have near mirror finish to them. Let us know the name of the BAD CAPS you remove from your unit. You may even want to document with pics with a digital camera what you find. Well, good luck guy

Jan 17, 2010 | Samsung SyncMaster 932B LCD Monitor

3 Answers

I have an HP vs17e flat sceen monitor that will not power up. Checked the power supply cord and it is fine, just acts like it is not getting power ????

I'm working on exactly this board right now, same problem. Two of the capacitors (c822 and c824, right at the top edge center of the board) are bulged and blown, causing my power-fail situation. They're available for about thirty cents a capacitor from any specialty electronic place. Piece of cake to solder in with the right tools and a bit of care. Hope it might be another clue to your problem. Good luck.

Nov 12, 2009 | HP w1907 LCD Monitor

1 Answer

Screen goes white

check the -ve ground voltage (we called it G1) on the card back side of CRT gun. the 1 or 2 no. pin. when u switch on it the voltage must be between 40 to 60 in negetive. if don't then follow the track and replace the controller transister. also the electolytic capacitor in that line....change the filter near EHT transformer. (that might be 10mfd/250 volts DC). used to filter that negitive supply.

if the monitor is compaq or samsung model then it is different.
for that u have to tell me then i will tell u....

Feb 08, 2008 | Gateway FPD2275W LCD Monitor

1 Answer

Dead power supply power across the bridge 700 volts across the main capacitor indicating smps is filtering

sounds like you have a dead switching suppy. On these sets the best way to trouble shoot the power suppy is disconnect the horizontsl output and measure it Is it shorted yes replace the fly and the transistor and resolder several cold joints in the horizontal drive curcuit as well as in the main switching supply. If the HOT not shorted then your gonna need a service manual unless you shotgun the repair. Good Luck

Apr 18, 2006 | HP Pavilion M703c 17 in.CRT Conventional...

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