Question about Gateway FPD1975W 19" LCD Monitor

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Need schematic diagram for inverter section, and what voltage should be output at connects to screen!

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1500~1800 volts! do not use your DMM, it will blow it right up!
Firing voltage is high then drop down to about 500v after the CCFL conducts. What is it not doing? SCH is about impossible to get since Gateway does not make the monitors and the boards are my by 2~3 companies with its own secrets.
No bad caps?
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Posted on Aug 22, 2010

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Posted on Jan 02, 2017

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Hello, I have a student in our electronics class that has an Emerson EWF2702. Problem is the tv has sound but only a white line will show up on the screen when it's turned on. Can you provide a diagram...


Hello
A single white line across the screen denotes the absence of vertical sweep. Its vertical output section, or its vertical deflection coil section [integrated to deflection coin assembly fixed at the neck of picture tube] may got damaged. Deflection coil faults are very rare. You just look into vertical sweep output and its dirve section. Check for all voltages. Check its main supply voltage. The output voltage must be almost about the half of its supply voltage. Usually most of the modern telivisions uses an IC in this stage. Sometimes that Ic may be faulty. Check it also. Schematic diagram of Emerson is not available with us; and is ver difficult to get. If you wants any further assistance contact me. gopakumarg43@ymail.com.

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As there is audo is Ok, your TVs all other functions up to horizonatal output section is Ok. The fault lies in the horzontal output section. It may be related to flyback transformer, horzontal drive section and so on. A through cheking is needed. We cannot predict the exact number of components used in your tv. It can only available from the schematic diagram of that tv.
The schematic diagran can be bought from electronic spare part shops. Just note the model number of your tv which is marked at the back side of tv, mark it an go for the schematic diagram. On some TVs, the mumber marked on the schematic and the used one may be different. The most critical is its winding compactability with each other.

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My vizio gv42l fhdtv 10a picture flickers like a strobe light, on every input. had the tv since 08. inverter board? main board? Thanks Robert


you need to check first the power supply board whether the output supply 12-24vdc for the inverter board is stable and not flactuating..you can measure the output voltage with a multitester..you get a voltage output of 12-24 with the inverter board is connected or loaded to the system.be carefull of the high voltage at the inverter board..once the output is stable replace the inverter board or you can measure the output of the inverter be very carefull..the output range upto 500vac.be carefull..if the high voltage is stable replace the lamps...tnx and good luck..

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Hi!
The reason why the button of your monitor flickers is because the 12 volts output supply for your inverter board is not stable..
If you have the skills and the right tools for this, Here's what you need to do
1. If your monitor comes with a power supply adapter, open it..check and replace blown capacitor with same value..
2. If your monitor is using a cable power cord..open the back cover of your lcd..on the power supply section.. check and replace blown capacitor.
3. Check and resolder the terminals for fixing possible loose connections.
4. On the inverter board section...check and resolder the terminals for fixing possible loose connections, the high voltage inverter usually loose connections when overheat.
5. Other things to check if step 1 to 4 did not resolve your problem. Check and replace burnt high voltage transformer.. Check and replace busted backlight inverter..

Hope this fix your problems..

thanks.. much appreciated if you rate this help.


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Call the Fujitsu service 800 number, you may still be under warranty.
It sounds like the inverter has burnt out, take it to a Fujitsu authorized repair shop, your tablet has a security feature that will lock you out if it is opened by an unauthorized repair shop or anyone else for that matter.
They take your tablet security very serious.

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1 Answer

POLAROID TV HAS NO PICTURE


Hello RAEQUINTERO,

The problem you described sounds like either your inverter or back-light has malfunctioned. There is a way to test this. Turn your TV set on and in a dark room shine a flashlight onto the screen and see if you can make out a faint image of a picture. If you can this means that the back-light or the inverter has malfunctioned. Now at this point I should tell you if either of these has failed you have to make sure to check if the back-light, inverter and LCD screen are not one unit, because if it is the screen with the inverter and back-light will cost as much as the entire TV. If the screen inverter and back-light are separate devices then you will only have to replace the defective part. These are the pieces of equipment and documentation that you will need to properly repair this problem:

1) The schematic for the TV try www.servicemanuals.com
2) A Multimeter To measure the voltage levels and bias voltages of the inverter and back-light inputs and outputs
3) Signal generator To establish a know good test signal for proper measurements
4) Oscilloscope To measure wave patterns from the Video output feed.

Use the schematic to show you what the voltages should be at different points on the back-light and the inverter. Use the multimeter to measure these bias voltages and voltage levels on the back-light and inverter pins and board connections. Use the signal generator connected to the F connector of the TV to establish a known good signal to the TV. Then use the oscilloscope to measure and view the video signal levels and the data stream that form the picture.

You may have to do a lot of removal of boards to get the the LCD back-light and inverter, however the schematic will help you with this (Remember to mark all cables for easy reinstallation).

This is the way to do this if you are going to attempt this yourself. If not please have a qualified TV repair-person give you an estimate of cost and have them repair the TV set.

I hope this helps

Thank you,

Shuttle83

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