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Re: inverter problem , prefer to repair the board not buy...
Repairing lcd inverter is like repairing a hv circuit used for strobe lights. try to check first all electrolytic capacitors, then loose board solder, also occularly check both ccfl bulbs for breakage and burnt marks.. best is if you can download schematic diagram for it so that you may check also all semiconductors on the board.
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Jan 3, 2014 - Uploaded by ShopJimmy.com
LED TV Repair Review & Overview-Common Problems - Symptoms, Solutions Click Here to BUY TV REPAIR PARTS: ...TVs inputs and outputs, this main board is connected to thebacklight inverter/LED driver via this ribbon cable. ... ofillumination for the screen and the board that drives thatillumination.
Dec 31, 2012 - Uploaded by ShopJimmy.com
Philips TV Repair Flickering Image On TV Screen Tutorial Guide How to ... Inverter on LCD TV Easy Fix Help Click Here to BUYTV REPAIR PARTS: h... ... How to Replace the Backlight Inverter Board in LG & Philips LCD TVs.Missing: restore illumination
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.
As you said when there is no backlight the problem is either inverter or power board. In some case the main controller board may be responsible. You need to test the parts to find out what part is responsible. Testing is done tracking voltage from PSU to inverter. Voltage to inverter is usually supplied by the higher VDC line from PSU. Here broad description of how to test the three
parts: Before proceeding... The TV can be repaired at component level or replacing boards, depending on your skills and experience. If you want to repair at component level, after diagnosing the faulty board you test components and circuits individually. In that case to test inverter in full you will need an oscilloscope to read the phase of inverter AC section (oscillators or IC must be tested).
Note: If Inverter has voltage out to CCF lamps, then the parts mentioned above are OK, in that case you have a faulty LCD panel. The TV is usually not worth repair as the LCD panel is expensive. LCD panel faults are not common.
Here replacement parts for most flat panel TV models:ShopJimmy.
Before thinking of a new set, try this first.
You may power on the unit in the dark room and directly shine the
flashlight to the LCD monitor. You will barely see an image or picture because
the fault is either theinverter
boardor the lamp (backlight).
You may isolate the problem but it will require you sometools and test instruments.
Also, you must know some basicsafety
Best way to find the faulty parts between the two you need to test
theoutputof the inverter board. You can do it
using thevoltmeteror if does not available you may
substitute atwo 12v car bulb
in series to the output of the inverter board. Powering on the unit and
look if the bulb willglowornot.
Yes, your lamp was busted. No, the inverter boardfail.
The Inverter board must be tested and eventually replaced. The inverter is the small board located at the base of display. This is connected to one side to the backlight lamp, to which supplies AC high voltage, and on the other side to motherboard, where receives DC voltage.
Inverter contacts to otherboard and to lamp must be tested , using a multimeter to read volts. The inverter is an AC board, and for safety reason the test must be done by a trained repairer. If the inverter is OK check the contacts to motherboard and wiring harness to motherboard..
Also ensure that light is not just dimmer because energy save mode is on, or because the laptop is running on batteries.
Your Microwave uses "UltraWave technology" I'll explain a few things about this wonderful technology... The control board (accepts the pushbutton commands) has to talk to the inverter board to tell it how much power should be applied to the magnetron. The inverter board will then power the magnetron and inform the control board if the magnetron is working OK. If there is something wrong with the magnetron or inverter board or a there is a communication breakdown between the control board and the inverter board...WA-LA-----F9----
A pretty reliable test for the Magnetron is to operate the oven and listen for a ticking sound 5-6 times about a second apart. If you can hear the ticking....The magnetron has failed..if no ticking, the control or inverter board failed.
The Magnetron sells for about $78.00 and is simple to replace. Check your owners manual for limited warranty on the MAG and electronic parts.
I did some poking around and only found a few places that sold inverter boards for this monitor. Ebay has one that sells for about $80:
I wasn't able to find any specific instructions posted, however, taking a typical LCD panel apart and replacing the board shouldn't be too difficult. The only hard part is not getting shocked, which is why this is not a job for the typical user. Anyway to disassemble the typical LCD you remove the pedestal from the back of the LCD then remove the screws around the back of the LCD, remove the back and look for the inverter board. Typically it is covered with a metal shield; again the hard part is knowing how to correctly handle the parts.
Considering you can buy a new 17" LCD for $120 to $150 (and has a 1 year warranty) you might want to consider investing in a new monitor instead. If you have any other questions let us know, otherwise please don?t forget to rate this posting.