20 Most Recent Proscan 42LA45H 42 in. LCD TV - Page 4 Questions & Answers


Hi Mike,

I worry the AV PCB was damage on your TV. But prior to get repaired / replaced , first please check your audio line like wiring terminals/ connection.
If nothing problem there, you need to repair /replace the AV board.

Regards

Proscan 42LA45H... | Answered on Sep 28, 2011


Hi
If picture and sound is Ok, and only this buzzing sound is heard from the back of the TV, It should be due to core soose of some ferrite cored transformers inside, especially to the power supply regulator board of the TV. Open the back cover of the TV and swtich it ON. Listeen very carefully which transfromer makes the buzzing noise. Just trouch and press the core of the transformer suspected with some non-cunductive material like glass rod, or a stick of dry wood. You can identify the transformer that makes noise by this way. After identifying the exact transformer; switch OFF the set, unplug it from mains socket, apply some "Super Glue" like fast boanding glue to the joint of core of that transformer. Allow sometime for the glue to set. This will solve the buzzing sound problem of your TV. OK

Proscan 42LA45H... | Answered on Aug 06, 2011


First check for the speakers of the TV it is found on the left and right ride of the TV. Usually the reading is 8ohms in a multimeter.then if it its good try to check for the sound amplifier it is found on where the speakers connectors are connected, try to replace a new one.. hope this may help you

Proscan 42LA45H... | Answered on Jul 26, 2011


You might wish to unplug the TV for an hour or more. If this power reset does not allow the TV to turn on component failure is indicated. These sets are assembled using the wave soldering process they are known for having cold solder connections.

The safety circuitry shuts the TV set down or will keep it from turning on when it detects a problem. This model of TV has over 2,000 parts, which includes millions of transistors inside the integrated circuits. The capacitors will change value, leak and become defective. Resistors will change value and burn. Diodes and IC can go bad.

This may have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again if the parts that caused the failure to begin with are not replaced.

The only way to know for sure which parts that are no longer within factory specs and for a proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment specifically designed for TV service and the skills to use the test equipment. I wish I could tell you there was a quick fix or button to push that would fix the TV but that is not the case or the solution needed to get the TV operating correctly.



Black Screen - Sometimes, the TV may display a black screen, now you need to check the cables whether they are properly plugged or not. Reconnecting all the cables can also work for this problem. Also, if the screen has a screen saver, check how it's set up. And, if nothing works for this issue, then there is a possibility that the lamp, rear projection, or the LCD panel may have been damaged. Now, you need to check your warranty card of your television and se your set comes under the manufacturer's warranty period. Call the customer service for technical problem and get replaced if a part demands it.

Proscan 42LA45H... | Answered on Jul 08, 2011


It will cost you more than a new 42 inch TV for perfect condition screen.
You can try: www.interliquidparts.com, www.shopjimmy.com

Sell eAch parts in the TV in EBAY.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: 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.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Proscan 42LA45H... | Answered on Jun 13, 2011


This would be the decoder/tuner board giving out, Your going to need to take it in for a replacment of that board.

you can try to unplug it for a while and see if it resets but i doubt that will cure anything long term. Proscan is known for this issue and have been known to have bad decoders in them.

Thanks for being considerate and leaving a ratings and feedback today.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

Proscan 42LA45H... | Answered on May 06, 2011


I have not repaired this particular TV. I would certainly say there may be one or two bad capacitors in the power supply. One of the biggest reasons these TVs go down are capacitors that are faulty. If you know someting about TVs you investigate and check for bad caps with an ESR meter. If you are not sure, you must see a TV tech to avoid dangerous voltages and shock. Thanks for asking and show all hands of support!

Proscan 42LA45H... | Answered on Apr 15, 2011


Hi,
There would be button on tv remote for that, check CC button on tv remote and press it (may be few times) to turn Off Close Caption function or check Settings/ Setup Menu of tv for CC.
Let me know model number of tv written on rear if problem still not solved.
Thanks.

Proscan 42LA45H... | Answered on Mar 30, 2011


we had a tech out. replaced main board at suggestion on phone diagnosis. NOPE. tech tested and the entire TV needs to be replaced. still waiting

Proscan 42LA45H... | Answered on Mar 16, 2011


There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.

If you aren't tech savvy, this unit needs to go in for repair.

If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for different brand, but same issue) on youtube.
http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.

Proscan 42LA45H... | Answered on Mar 15, 2011


It can be due to unstable power supply, T-CON board, main board, backlights inverter board.
You need to do in-depth troubleshooting to narrow down the problem, please read my guide first if you are going to DIY repair or not.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: 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.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

Proscan 42LA45H... | Answered on Mar 10, 2011


the problem on your remote i think,, infrared is defective you can testing that by using digital camera place on the top view in the front of infrared of remote when you press any button on remote the infrared should lights on to the camera if not your infrared is defective you need to replace that or you can buy a new one
http://www.remotes.com/remotes/servlet/rs?a=Search&o=c&uid=0&m=42LA45H+&uuid=12994007437230

if this solution helps you please rate it thank you

Proscan 42LA45H... | Answered on Mar 06, 2011


I believe it's fixable! Take a look on your video and audio cables (behind the TV, the red, yellow and white ones). They must have a problem. Already happened to me!
I hope I've helped...

Proscan 42LA45H... | Answered on Feb 14, 2011


Simple test to check if the problem is in the remote or the tv: take your phone and your remote to a dark room, activate its camera then point the remote at it and press a button and keep it pressed. If the remote is good then the screen will be lit up and the light will be pulsating. In that case the connector for the remote sensor inside the tv got dislodged when you have moved the tv - just open the back of the tv and reseat it.

Proscan 42LA45H... | Answered on Jan 30, 2011


Go into the menu to see if the closed captioning systen is in the "off" mode

Proscan 42LA45H... | Answered on Dec 30, 2010


Hi,

Unplug the unit for few minutes, say 30 minutes, and then turn it ON. If the problem persists, this is am internal failure and needs repair.It could be an issue with power supply board, vertical circuit , horizontal circuit and many more. If you have electronics repair experience, would be able to read schematics and use multimeter/ soldering iron, could keep all the precautions - revert and i would be glad to provide you few pointers.

Let me know,so that we could proceed.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Proscan 42LA45H... | Answered on Dec 03, 2010


some tv's have an option for the signal in the antenna try that in your video setting my man hopefully thats a simple solution to a simple problem the lack of the yellow video input has me head scratching as it odd they didnt provide one ????? strange indeed good luck my friend

Proscan 42LA45H... | Answered on Nov 18, 2010


What part is it, that you have already replaced? Please clarify this info so that I can tell you what you can do to resolve the problem.

Sai.

Proscan 42LA45H... | Answered on Nov 09, 2010

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