20 Most Recent Proscan 42LA30H 42 in. LCD Television - Page 2 Questions & Answers

This is likely do to a faulty capacitor on the Y-sus board. Most people have the board repaced instead of repaired. Depending on where you live, it could be a $125-$250 repair. Or you could get lucky enough to find the board at shopjimmy.com or tigerdirect.com which carry electronical parts. you can purchase a repair manual at eserviceinfo.com
It will tell you how to solder off and remove the old board and replace it with the new one. Most RCA stores service and carry parts for these tv sets.

if you have backlight the problem is t-con if not inverter board

well you need to locate part on the board unsolider with soilder wick put new part in if you know how to do it

Same problem here, there is a high-pitched sound in standby. As soon as the light turns blue and the TV is on it's gone. I actually exchanged this TV three times at Best Buy but all the models made the same buzz in standby. I was told that it's normal and in the store you can't hear it since there is too much humming from other TVs around. The power is transformed down to a minimum, just for the remote controls, internal clock etc. and this causes the buzz, like when you dim your lights at home. I hooked it up to a surge-protector for clean power and just switch it off over night. During the day it's hard to hear anyway. - Again, since this is my third (!) Proscan 40' exchange I can definitely say that this is normal for this model. I was just surprised that nobody mentioned the same problem so far on the Best Buy reviews.

l remove the main board to fix, l install mail board after they fixed and not turn on like before

Hi,

there are so many reasons why your TV won't bring out sound. You need to troubleshoot first, in order to get to the root of the problem, before a solution can be proffered.

First, connect a DVD player to the TV, observe if there is going to be sound. If there is still no sound after connecting the DVD player to the TV, proceed to the next step. "The reason why I asked you to connect a DVD player to the TV is to confirm if the problem is simply not from the audio cord connected to the TV."

Second, get an headset, connect it to the earphone jack of the TV and observe if there is going to be sound. If there is no sound, then it is glaring now that your TV is having a defective sound card/IC that's why it is not bring out any sound. (Note that connecting an headset to your TV is optional because not all TV's has a space for headset). "The reason why I asked you to connect an headset to the TV is to also confirm if problem is not from the TV speaker. Though TV speaker problems are rare but sometimes, the TV speaker might be defective or the speaker wires may have loosed contact or cut into two, due to one reason or the other. But if the headset doesn't bring out any sound from the TV, then it is not so."

If none of the above seems not to be the cause of the problem, then the above troubleshooting has confirmed that the TV has got a defective sound card/ic. The sound IC/card of the TV has to be replaced for the TV to bring out sound again.

To be honest with you, replacing or fixing the sound card/ic of your TV requires the ability or experience to do so.

Now, if you are convinced you can fix or replace this yourself, please reply so that i can help you further. And make sure you troubleshoot first, before getting back to me.

Regards.

Hi.

Problem is inverter, backlight or PSU. The backlight lamps that illuminate the LCD display are flashing. This creates the "kind of strobe" effect that you see. There are several possible causes for the problem.

The lamps themselves are defective. The lamps do not fire up completely and keep flashing. The lamps are not sold alone but they are part of the LCD display. If the lamps are gone the TV is not worth repairing.

The inverter is the high voltage board that supplies the backlight lamps. If the inverter is defective it can still be replaced. Testing is done reading DC in, checking high voltage out, and using an oscillator to test the phase of the AC out signal generated by the inverter oscillator section.

PSU or main controllers may be defective. This will less common in case of flashing back-light. Test this if the inverter is OK and if the problem is DC voltage input to inverter.

Here parts: 42LA30H - ShopJimmy

Regards.

Ginko

Now the tv set is on,tv still have any LED power light indication at all or LED power light indication are flashing?Yes,the power supply board it is shorted and dead.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board ffor the replacement.

Hi,connect the tv to a stablizer..dont connect it direct from power source and make sure you place it in a place where enough air can reach it.

Cannot be turn on by either remote or the power switch on the TV?
Power supply module will be the first palce to check, please read my guide first if you are going to DIY repair.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Basic troubleshooting guide here: 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 Parts: www.interliquidparts.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, long life rating such as PANASONIC FM or FC series.

Most cable TV systems that use a set top box or converter output on channel 3 or channel 4.

If you have HD cable service however, you probably watch on one of the A/V or HDMI inputs (Video 1, Video 2, etc.). Simply press the Video or A/V input selector, slowly & repeatedly until a picture & sound is seen and heard.

This is a board level fix.
The part is about $10. + time to solder on the part
Capacitor C809 is failing.
390mfd @250V

yes it does , if you are viewing the TV from the rear it is located in the back on the lower right , on the right side of the RCA's . here is a link to give you a visual , just wait for the manual to pop up .

http://www.managemylife.com/mmh/owner_manuals/15565/PROSCAN-LCD-Television-L1001098

Please make sure any device that is connected to the tv is disconnected.

Unplug the tv for 2 minutes. This will ensure all mechanics in the tv are given enough time to reset.

Plug it back in.

If the tv still strobes let me know.

If you've heard a loud pop then you should most certainly be able to see where the problem is if you open it and look at the boards.

The most likely source of the sound is a burst electrolytic capacitor although I can't guarantee it.

You'll be looking at the power board.

You may make a good high resolution picture of it and post it here or follow up with me offline.

I know I am not telling you much but frankly there are too many possibilities to start listing.

Bobby
www.coppelltvrepair.com

It sounds like you are having the problem with the T-CON board, try opening the back and have small fan blowing in the back to keep it cool to see if it will help, post back.
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

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

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com

Try 0030, worked for me on Comcast remote

hit display on your remote