Question about HP Pavilion M703c 17 in.CRT Conventional Monitor

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

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Re: Dead power supply power across the bridge 700 volts...

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

Posted on Apr 19, 2006

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connect a series lamp for sefty to the monitor. start to disconnect the component from fuse ,line filter, bridge rectifier, filter capacitor, check the voltage at ic 12v also check pulse at str if not then check ic resistors capacitors,and replace if found faulty

Mar 23, 2011 | Samsung SyncMaster 1100P 21" CRT Monitor

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Screen menu e.g brightness and screen size, is on and no way of getting it off

regencyfirep, First, this unit is listed on Retrevo . com as "over the hill, and should be retired. What is "date of manufacture" from rear of monitor? Symptom indicates possible "switch-mode-power-supply" +5.00volt may have "noise" or be a bit out of "regulation" and that will cause the VGA to lcd processor/converter board to "act stupid" and not recognize valid front panel "menu key presses" !!! Does this unit have lay on floor "black-brick" power supply or just a line cord to wall outlet? Unit may need $6 in new electrolytic filter capacitors installed on the SMPS board. If unit is "mission critical" , then sub-in working unit till you can investigate power supply board for swollen,leaky filter capacitors unit may have. If you have solder, solder-wick, soldering pencil(40watt) visit YOUTUBE for "lcd monitor disassembly", "lcd monitor repair" video clips that show typical repairs. Let me know brand name (CapXon, Elite, Jun-Fu) of capacitors used on SMPS board. Read fixya profiles of "budmrtn" "buddymc" "12fixlouie" and testimonials for more info on DIY repair. Hope this response helpful to you. 12fixlouie

Sep 10, 2010 | Neovo A-17 (Black) 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

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

2 Answers

Samsung lcd monitor 153V has no display power indicator (green) is ok found 1 ic AE3U1T burnt. is this ic available or has the psu and backlight panel pcb to be changed..

Samsung 153V LCD Monitor Power Supply Repair Tips

Troubleshooting Samsung 153V LCD power supply is just like troubleshooting those CRT type. This monitor came in with no power symptom. If you are first time repairing this type of power supply, I recommend you to first remove the switch mode power transformer. Then test every single component in the primary section, before you continue to check the secondary section.

You have to be good in testing basic electronic components in order to detect the fault. You can always browse through my website just in case you do not know how to test basic electronic components. If you do not know the right way to check, you might miss out a bad component and this will lead you not able to solve the problem. After carefully checking all the components in the power supply section, I found the filter capacitor do not have any reading using digital capacitance meter (open) , the two round type fuse also open circuit, 1N4744 15 Volt zener diode short circuit and lastly the power IC TOP247F blown!.

Testing the SMPS (switch mode power supply) primary winding with a **** smith fly-back tester, shows green bar which indicates good winding. What we left here were the secondary diode and filter capacitor. Upon checking them with analog meter and ESR meter, found all of them to be good condition. Other area like main board and inverter board also looks okay (Power failure rarely affect these two circuit). Now we have confirmed that only five components found to be faulty.

One by one the components were replaced (except one fuse) and just before you switch on the power supply, make sure you connect a 100 watt light bulb across the live ac line. Once it is done you can then proceed to switch on the LCD monitor to look at the brightness of the bulb.

If it very bright, this suggests that there are still short circuit somewhere in the power section. If it dim or totally goes off, you can now place your red probe to the secondary side to check if any dc present at their respective line. If there are DC voltages present at the output, you can switch off the power, discharge the filter capacitor (for safety purposes), remove the light bulb and connect back the new fuse to its original location.

You are now hundred percent sure that the LCD power supply won

Mar 23, 2009 | Samsung SyncMaster 153V 15" Flat Panel LCD...

1 Answer

15" CRT Monitor samsung totally dead

Dear munu007 good morning this is viswanath

Don't worry I can salove UR problem

1.First U can check any physical damage in power supply (220/400v)Main capacitor,
2.And also check LOT It's OK Than Remove H O/p Transister, check SMPS output voltages ,voltages are currect That means SMPS is OK.Check Boosting FET IRF630(Q402)Change it New One,and also change the IC604 7805 Regulator.
Finally change LOT.
check any dry points (SMPS&Hori.)

Oct 08, 2008 | Samsung SyncMaster 551 15" CRT Monitor

3 Answers

Set dead

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

Feb 07, 2008 | SAMTRON 55V 15" CRT Monitor

2 Answers

Monitor not working

if it is completely shaking then problem is in power supply filter ckt. 1 please check main filter capacitor. 2 check bridge rectifier diode for open. 3 loose connector in power supply. But if it is shaking on top then check for horizontal oscillator section. if you are not rech. person take the help of skilled tech. good luck.

Oct 03, 2007 | 3M MicroTouch 17" CRT Monitor

2 Answers

56 V - faint horizontal lines across the display

u can search problem in vertical section may be sum IC component was dry resold them .

Aug 02, 2006 | SAMTRON 55V 15" CRT Monitor

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