Question about Proscan 40LD45Q Full HD 40 LCD TV

Open Question

I replaced the inverter panel on my 40" proscan tv but still have no picture and no backlight

I found there was a very significantly sized burn spot on the inverter panel and replaced it with no success after investigateing the tcon i found a small chip in one of the resistors (perhaps it was a copassitor?) power supply seems to be fine and there are a few hazy spots on the main board, by that i mean im not sure if they are burnt curcuits/solders one thing im almost certain is the c10 and c15 have a number of sockets in wich only one is very discollored and to me appears they are burnt how exactly can i tell if this really is the case? also how can i eliminate wich parts i will not need i already put in a brand new backlight inverter and dont wanna continue wasting money on the tv. buying a new one is not an option right now and the tv is only two years old, how can i tell if i will not need a new power supply or if i will not need a tcon or if i will not need a new cord or even main board? please help i am desperate.

Posted by on

  • 1 more comment 
  • bamjondied
    bamjondied Jan 03, 2013

    sorry guys still new to this website...mr.jorge rodriguez its sounds you are very certain would you mind me asking what a convergence stk is? i really wanna get this tv fixed and its somethig ive taken a very big interest in. to mr.terry grant how could i check the horiz output and xformer i have no ohms meter, sorry for suck newb questions btw im just starting to get into tvs, and mr>test test im not sure where my xformer is located is that on the tcon? where does the hv splitter connect? again very sorry if it is any help i do not have any backlight whats so ever and i removed the tcon and main board completely and put them back in still to have the same problem i now have them both out again just sitting on my desk

  • bamjondied
    bamjondied Jan 03, 2013

    the model number of this tv is 40ld45q serial number 9144-40ld45q-t105969 main board number is 9re01zr772lna5-a1 tcon number re46ay2500-20091005.would any of think i should just replace the entire main board and tcon? would this fix my problem?

  • bamjondied
    bamjondied Jan 05, 2013

    just as an update i was looking over my tcon and found both my hrizontal transistor (one of the 7 that i have) and the modulation diode have big chips in them a junk is just blown out of them... how much does it cost for these parts? the mudulation diode i believe is 460 ohms, still a little confused about the hv splitter could anyone tell me where this is located and also what exactly does the transformer look like im pretty sure i know but jut wanna double check.

×

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 1694 Answers

SOURCE: no power

Probable IHVT aka flyback xformer.Also,check Horiz output

transistor.Please provide service number (three characters longer

than model number) & chassis # then I can give you part numbers.T.

Posted on Oct 12, 2007

Ad
  • 9 Answers

SOURCE: Convergence Problem w/Proscan PS56670

IN THAT CASE YOU NEED TO REPLACE THE CONVERGENCE STK'S AND SOME TV'S NEED A INTERNAL ADJUSMENT AFTER REPLACE THE CONVERGENCE.

Posted on Jan 18, 2008

Slinteriors
  • 8617 Answers

SOURCE: 52" ProScan TV

You would have to do that through the service menu. However I would not recommend doing that without the service manual. I can post a link to the service manual if you would like.

Posted on Feb 24, 2008

  • 1 Answer

SOURCE: Proscan PS61700 Beeping no picture

I have a 60in Proscan Projection TV. My picture is out and the TV only beeps.

Brian Allen

Posted on Mar 17, 2008

SOURCE: Proscan PS60690

First of all I take it that your TV is a PS60690 model. Unplug the TV and let it sit for a few days because there is approximately 3,300 volts at the splitter. You’ll have to remove the front lower panel. It is held in by clips around the top. I removed it by hand. Once you get your fingers to pull it away a bit the clips should release and then you can just lift the piece up and out of your way. Next you will have to remove the convergence panel in the center. Remove the bolts that hold it in and un clip the four wire connectors (2 on each side) and set the panel to the side. The splitter is now visible by looking into the hole and up to the left. It is held in by 2 bolts one in the front of the splitter and one in the back of it. Don’t remove it until you have all of the wires removed. Remember to be very careful here because of the potential voltages. The voltage should bleed themselves off over time but might not! I used my electrical meter to test for voltage before I touched any bare wire. What I did was remove the wire with the red grommet that holds it up into the splitter. There are 3 green grommets and a black grommet. They might be hard to see the colors because of the dust …. Just wipe them off. The red one is the one on the far left of the wires that are 4 in a row. I used a screwdriver from the front and lightly pushed the retaining clip towards the back of the TV while gently pulling the wire downwards. Watch out for the little bushing that is around the wire. Try not to lose them because you will need them to put the splitter back together. Now I took the red lead from my tester and touched it to the exposed wire end that I just removed and touched the black lead to the metal part of the TV chassis where the splitter is actually mounted. Once you’ve established that there is no voltage present, label all of the rest of the wires so that they will be put back in the right places when you are ready. Test each wire the same way before touching them. Remember to be careful and capture all of the little bushings You will need the splitter before you do this so you will have to buy it. The RCA part number is 205064. I have to run right now but I will send you any info that you might need ……. Just ask …… I don’t mind helping out if I can. There is more.

Posted on Oct 06, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Proscan led 39" tv no picture


Back - light problem. 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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions

May 21, 2015 | Proscan Televison & Video

1 Answer

Have a proscan tv dvd combo it turns on has sound but no picture


Back - light problem.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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel.If so, they can't be replaced.In this case; a panel replacement is the only repair.For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS].To such sets, the power supply section circuit too should be troubles hooted.Contact any service technician.The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts.It will make surf easy.

Feb 25, 2015 | Proscan 32LB30QD 32 in. LCD TV

1 Answer

Proscan 32la25Q Backlight not comming on


You either have a faulty backlight or one or more of the inverter transformers is bad,
a close inspection of the picture when on will show a bad tube as it will be lighter or darker than the rest,transformers may be hot to the touch

Len..

Oct 13, 2014 | Proscan 32LA25Q 32 in. LCD TV

1 Answer

Why does my ProScan 40" unit cut off the right and left edges of the picture? It happens in Normal mode and Wide Screen.


Back-light problem. 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/

Aug 29, 2014 | Proscan 40LC45Q 40 in. LCD TV

1 Answer

Proscan 32LB30QD TURN ON SOUND BUT NO PICTURE


Sounds like a bad inverter thats what powers up the backlights so you can see the picture on the screen. usually its about 85% of the times the inverter if you have pefect audio and remote functions but a black screen in a LCD modeel TV. You can get the inverter board from www.tvrepairworld.com

Jan 12, 2013 | Proscan 32LA30Q Television

2 Answers

When i turn proscan tv on it automatically turns off(just turn on for less than secon


OK I Have a 40" Proscan 40LD45Q
had the power problem when you turn it on it would flash and then cut off again.
after checking I found that the transistor on the power board was bad.
Its one of the 2N4401 transistors found on the cold side in between the
cluster of resistors and and mosfet heat sink. kind of hard to get too
but replaced it and tv works great now.. $1.19 at radio shack for the part.
Hope this Helps ..
By Lynn

Feb 22, 2012 | Proscan 40LD45Q TV

1 Answer

I have a 42 in magnavox 43mf439b/f7 tv. It is about 2 years old. i have no picture but i have sound. if i change channels the sound changes. I did a little research and i believe that i have...


You were smart to test the image for burned out backlights! :)
Typically, on a screen this size, the backlight inverter is the first place to look.
I found the part number...
27-D026774 Funai TV Module, backlight inverter, PNF10092, I420H1-16A0, 42MF439BF7

You can by it here...

http://www.tristatemodule.com/p-13231-27-d026774-funai-tv-module-backlight-inverter-pnf10092-i420h1-16a0-42mf439bf7.aspx

Aug 23, 2011 | Magnavox 42MF439BF7 42 in. TV

1 Answer

My dynex tv has sound but no picture it happened a day ago i found that the problem might be the backlight inverter board if so how can i fix it


Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the - side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

Jan 27, 2011 | Dynex DX-LCD32-09 LCD TV

1 Answer

I have a red light flashing and no picture


More likely to have failed backlight inverter board that just about impossible to get. I had to modified LCD monitor backlight inverter board to get it to work with this TV.

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

Jul 22, 2010 | Proscan 19LA20Q LCD TV

1 Answer

I have a Sony KDL-40V2500 LCD 1080P TV there is no picture the


A 4 flash shutdown indicates a backlight problem. It can be acused by a bad backlight inverter board (the backlight power supply) or by a defective backlight in the panel. There are fuses on the backlight inverter board called "picofuses" which will need to be checked in order to isolate the problem to the board or the panel. If the fuses are good, you have to replace the panel (very expensive!). If the fuses are opne, most likely the back light inverter board has failed.

Nov 25, 2008 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

Not finding what you are looking for?
Proscan 40LD45Q Full HD 40 LCD TV Logo

Related Topics:

46 people viewed this question

Ask a Question

Usually answered in minutes!

Top Proscan Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74383 Answers

Jerry Greenberg
Jerry Greenberg

Level 3 Expert

1667 Answers

Jaime Hernandez

Level 3 Expert

2318 Answers

Are you a Proscan Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...