Question about LG 500LC Monitor

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Hi , My monitor CRT type LG500G was dead , I check power in the power supply only 325 volt and the other pin of transformer no voltase . Can you help me ? Iwan Sarifudin

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: AOC color monitor model 9g1rs, dead, ** volt, fuse good

Hi
You need to replace HOT(Horizontal Output Transistor) see number carefully before you replace it.
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Posted on Mar 18, 2008

silly girl
  • 513 Answers

SOURCE: MONITOR REPAIR HELP

The mains switch is a weak link on these, check this first. Also 1 of 2 33K 2W startup resistors in PSU goes o/c, check with DVM or if you have very high volts on main primary res cap this usually indicates a 33K has gone - change both. I've also had a small TO92 transistor hanging off the UC3842 failing causing no startup. A s/c HOT normally causes a blinking LED. note that AC cap IS charged, DISCHARGE BEFORE WORKING ON IT! Did you check for shorts in the secondary side of the p/s, horiz output? If there are none , look for the switching regulator. Check the support components. I've seen these with open solder connections on the coils in the PS due to that abominable glue they use...you'll see signs of burning/arcing on the inside of the cabinet, too. Good luck

Posted on Apr 11, 2006

techman
  • 3130 Answers

SOURCE: Help on monitor repair

Have you checked the horizontal output transistor for a short or leakage?? most of these sets will not start up unless the horizontal sweep sends the pulse to the power supply and says start me up!! I would look at bthe drive as well on the horiz. curcuit. If theres a pulsating voltage that means its waiting for something to signal it to work or its missing something.. Good luck

Posted on Apr 23, 2006

jemmyrash
  • 180 Answers

SOURCE: Monitor is totally dead

Through my past experience I mwould remove the solder point at the input power B+ line to primary winding FBT. If the HOT has shorted there will be no power.Straight to the point if you know where the HOT is , you can desolder the middle pin or collector of the HOT transistor. If you desolder the pin which result the power led light turn up. That indicates either FBT or HOT has shorted

Posted on Apr 19, 2008

  • 1 Answer

SOURCE: LG Studioworks model (500G)CRT Monitor flickers most of the time

lg 500g studioworks green color

Posted on Sep 03, 2009

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1 Answer

What is "flyback" in a tv monitor


A flyback transformer (FBT), also called a line output transformer (LOPT), is a special type of electrical transformer. It was initially designed to generate high voltage sawtooth signals at a relatively high frequency. In modern applications it is used extensively in switched-mode power supplies for both low (3V) and high voltage (over 10 kV) supplies.

this is use only on monitor the old one that used CRT TUBE.
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I would recommend geting a new transformer, althought its possible that there is a connection loss somewhere in the middle or then it would require replacement parts, does the transformer have a power light on it?

Shouldnt cost alot, checking.

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1 Answer

A 220 volt Amstrad monitor that i want to convert to use 110 volt


engagetek, This would be a very easy thing to do if and only if the label on the rear of the unit has printing similar to my GATEWAY LCD. It states as follows: "100 - 240VAC input 50/60hz." If your Amstrad unit's label reads "220-240VAC 50/60hz only, then you will need to reverse engineer the "ac to dc" power supply, be it an old "linear" or a modern "switch-mode-power-supply" type. You did not state what type of monitor technology your Amstrad is. CRT, LCD, Plasma,???? I would guess that it is a CRT type. Well anyway, I hope the info was of some use. Bye for now, I'm louie12fix on fixya

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1 Answer

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check voltage at the primary filter then check voltege at pin no 1 of STR dc which should be approx input volt if not then clear the path if present then check check up down volt at pin no 3 if not persent then replace the small capacitor near it the problem will be solved

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1 Answer

Monitor is totally dead


Through my past experience I mwould remove the solder point at the input power B+ line to primary winding FBT. If the HOT has shorted there will be no power.Straight to the point if you know where the HOT is , you can desolder the middle pin or collector of the HOT transistor. If you desolder the pin which result the power led light turn up. That indicates either FBT or HOT has shorted

Apr 19, 2008 | LG Studioworks 45 14" CRT Monitor

1 Answer

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Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
Good Luck!

Feb 17, 2008 | Philips 107E66 17" CRT Monitor

1 Answer

Television repair


check the EHT Transformer and the power transistor connected with it. follow the track of centre pin of power transistor. check the power supply and the fuseable resistance in circuit. also check the drive at the driver transformer. check 2-3 volts AC drive on base of power transformer. inform me if you find any problem.

Feb 12, 2008 | Televison & Video

2 Answers

Dvd player is completely dead.


First thing to check is the power cord with it unpluged. Do you get a resistance there or is it open?? If its no reading at all then the power transformer or fuse or current limiter resistor is open. If you do get a reading then you know your power transformer primary is good. Next measure the AC volts comming from the secondary of the transformer. AC volts? Good! Now Find pin 1 or the end pins on the microprocessor. 5 volts present?? No theres your problem get a schematic and troubleshoot the power supply. Yes 5 volts? Measure the display any volts on it?? Ok im sure by now your gonna say no to one of these and like I said get a schematic and conferm all the voltages are present in the power supply. Most common dead problem in dvd/cd players is the power supply ie transformer,regulator, ic, ect, ect. Good Luck

May 10, 2006 | LG DVD 5183 DVD Player

1 Answer

Help on monitor repair


Have you checked the horizontal output transistor for a short or leakage?? most of these sets will not start up unless the horizontal sweep sends the pulse to the power supply and says start me up!! I would look at bthe drive as well on the horiz. curcuit. If theres a pulsating voltage that means its waiting for something to signal it to work or its missing something.. Good luck

Apr 17, 2006 | AcerView 78ie 17" CRT Monitor

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