The picture is missing the backlight. I realize it is high voltage but I am willing to go in. Is there a schematic available any place for this. I would rather not go in blind. If I do though what voltage should I have going to the light.
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Re: FDX-0700T has no picture
You should contact polaroid and see if they have a schematic for the backlight circuit as Im sure they do but wil they sell or give it up as alot of these things are a made by someone else and the distribution conpanys not allowed to give out any info on the units! Good Luck . Oh and heres a contact # 800-268-6970
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It is either the backlight or the LED driver board. To confirm, please check the LED drive voltage from LED driver board. If the drive voltage is available, it is the LEDs in backlight causing the problem. More often it is the bad LEDs in the backlight array.
1. Check out is the backlight on when you power up the TV? 2. If the backlights is on, then turned off when you power up the TV, please check the backlights power supply voltage (usually is 12V, or 24V), backlights ON voltage should be 3.0 V or higher, the DIM control voltage should be 2.8 V or higher. If the 12V (or24V) voltages is missed after shuts down, you do have a power supply problem; If one of the control voltage is missed or low, you do have a defective main board. 3. If both of the control voltage are high, the backlights turned on and then turned off, you my have a defective backlights inverter board, or defective lamps inside the panel.
This set is known for convergence problems where picture looks 3 d etc and this is caused by bad connections under and around the high voltage transformer in many cases.
First thing to do is look in menu to see if "Convergence" option is still there or missing----three small parts available as a kit exist to correct that if the option is missing (all are at same place around the high voltage transformer).
Set would have to be taken apart if you are able to check things there---if not most techs familiar with this set can deal with this in the home.
the connections and parts are all right where the high voltage transformer (called a flyback) is located.
Check the supply voltage to the backlight LED's. If it's too high and thus causing the LED's to go open a new panel will just become junk when powered on, and you may have damaged the replacement panel you already tried. To check the voltage just measure it at the cable end you connect to the panel. If no voltage bad motherboard. If too high still a motherboard issue, but you might be able to regulate it with a simple solid state voltage regulator.
Kung LCD TV ang unit mo, 3 ang dahilan kung kaya la kang picture.
1. Me pundido kang backlight - kapag me pundido kang backlight kusang pinapatay ng power supply ang inverter board para hindi ma-overload kaya la kang picture. Maaring mong i-check ang backlight, ang palatandaan na ito ay pundido ay kapag me itim sa magkabilang dulo.
2. Sira ang inverter board - ang inverter board ang nagbibigay ng high voltage sa backlight. Kapag sira ito, natural d gagana ang backlight. karamihang sira ng backlight ay ang high voltage transformer, driver transistor o kaya me open na fuse/fusible resistor.
3. Power supply- kapag la supply voltage sa inverter board, la ka rin picture. Mas maganda kung ito ang sira dahil mas madali makhanap ng pyesa dyan sa lugar mo di katulad ng 2 nauna.
Kung me kakilala kang technician dyan malapit sa lugar nyo, patingnan mo yong mga sinabi ko. Maari ring dahil sa loose connection kaya la ka picture o kaya bad solder joints.
Salamat kapatid sa pagboto 4 na hinlalaki.
Las Pinas NCR.
Two probable points; either the loss of the service voltage for the high voltage section or a failure in that section.
The circuit that produces the high voltage for electron beam acceleration also produces the sweep for the horizontal movement of the beam, in other words, if this circuit fails or the voltage it needs to operate is gone, no picture, but the audio still functions.
Because of its Chinese origins, there is a chance that critical specialized parts may still be available for it or, if you are lucky to have a tech competent to repair standard TVs, he may find a less critical part that has failed and readily available.
The Inverter is trying to produce the high voltage to light the backlight. It looks like it cannot hold the charge to maintain the high voltage level in order for it to stay on - you get a momentary display at initial power-up thus see the logo. Replace the Inverter board.
This might be a sign of a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
The question I have is if the tv stays on but with no pix or sound,we have a way to check,if you place your forearm in the face of the picture tube and the hair in your arm stands up it means you have the high voltage needed to light up the tube but something else is missing like the screen voltage or it has a loose conection in the crt board,if the hair in your arm does not react to static then we are missing the high voltage and the problem might be more involved and related to the horizontal circuit not creating the high voltage needed.If you are familiar with tv service you have a few places to check but if you are not to familiar play it safe and call for assistance from a professional servicer.Let Us know how it goes please.