Question about Sanyo DP32746 32 in. LCD Television

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Inverter opertion I have a Sanyo DP32746 and the backlighting is out. I have removed the inverter. What typically goes bad on the inverter board? If one of the bulbs go bad does the inverter board typically shut down?

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  • JSully2009 Mar 24, 2009

    I have a Sanyo DP32746 tv with a faulty backlight inverter. I am an electronic technician. Can someone help me find a schematic of this board, or help me solve which component is bad so I can replace it?

    I would appreciate it if, at least, someone could provide me with the Sanyo part number for this inverter.

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Hello davidweldon,

If the inverter board is bad, I would suggest that you replace the whole board unless you have a SMD (Surface Mounted Device) rework station, and a background in electronics. I have worked on TVs where people have tried to remove SMDs and it never is an easy thing to do, so I would again suggest that you replace the whole board, because all of the components are SMDs.

Now as to your question, I have seen on these sets the majority of the time it is a driver transistor that goes bad.

I hope this helps,

Thank you,

Shuttle83
www.electron-age-technologies-llc.com

Posted on Nov 28, 2008

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2 Answers

My hdtv image goes out after a short time of being turn on but I can hear the audio or the voice, could you tell me what could be wrong with it, thank you.


The tv have 1 or 2 a long board call a LCD inverter boards.These 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbishes 1 or 2 long LCD inverter board for the replacement.

Nov 07, 2010 | Sanyo DP32746 32 in. LCD Television

1 Answer

I have no picture on my Sanyo Dp32746 LCD tv, the audio works fine. I replaced the backlight inverter board, but still no picture. Tried the reset button on the remote, can not see the main menu to try to...


U replaced the 1 or 2 LCD inverter long boards,still the same problems.Sorry,this is a rare problems,but it seem the Tuner board is the problems.Replaced the Tuner board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner signal board for the replacement.

Oct 08, 2010 | Sanyo DP32746 32 in. LCD Television

1 Answer

I replaced the backlight inverter board on my 32 in. LCD Sanyo model Dp32746, but I still have no video. The audio works fine and from time to time it looks like you see a faint image on the screen. I...


Did you chaeck first to find out if the power supply is putting out 24vdc for the inverter board, and also if the inverter is getting the backlight_on signal from the main board.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps

Oct 08, 2010 | Sanyo DP32746 32 in. LCD Television

2 Answers

I was watching tv and the screen went black sound is still on but if i turn off and on i have no screen but still sound


It's probably a backlight or backlight inverter issue. (The backlight itself usually fades or makes the on-screen image change to pink/red.) For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx

With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight. With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing

I hope this helps.

Cindy Wells

Jul 14, 2010 | Sanyo DP32746 32 in. LCD Television

1 Answer

My sanyo screen is black but there is sound tv worked fine this morning


There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

Nov 14, 2009 | Sanyo DP32746 32 in. LCD Television

1 Answer

Sound no picture


You need to look at two places, one is the backlight inverter board (hard to get to), thesecond place is the power supply module, look for burnt parts, bad capacitors.
http://en.wikipedia.org/wiki/Capacitor_plague

Nov 11, 2009 | Sanyo DP32746 32 in. LCD Television

1 Answer

Sanyo DP32746 screen black no sound screen flashes when turned on


Hello, I just posted this to another user's question, and you might find it useful, too.

I have a pile of these in my shop. Unfortunately and usually, a backlight lamp is bad, and the inverter board is damaged when it goes out. The backlight lamps are sealed inside the panel, so the usual method of repair is to replace the panel.
If you turn the lights off in the room, then turn the tv on, you will probably see a momentary flash of light from the backlight trying to start up. The lamps can be replaced, but the option is not really cost effective given the amount of time it takes to replace them/very delicate nature of the lamps/availability of the lamps/cost of the lamps. Replacement panels might be available, but you'd have to use a TV shop for reference or call Sanyo directly.
These units also have a history of power supply heat damage, so if you don't see the momentary flash, it could be the power supply. But the momentary flash is the dead giveaway.

I hope this helps you...

Dec 10, 2008 | Sanyo DP32746 32 in. LCD Television

9 Answers

Sanyo lcd 32" vizion integrated hdtv


I have this tv as well with the same problem. From the research I've done, one of the 16 ccfl's(backlight bulbs) goes bad and they all will not come on then. I have not been able to find a replacement ccfl for this particular tv. The ccfl size if 3mm x 711mm. I have a feeling the scope of this problem is very large with this particular tv and this forum represents the tip of the iceberg. Sanyo unfortunately makes a piece of junk and we have that piece of junk sitting in our homes with no good solution other than to say, dont waste your money on another Sanyo tv.

Jan 09, 2008 | Sanyo DP32746 32 in. LCD Television

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