Proscan 42LA30H 42 in. LCD Television - Answered Questions & Fixed issues

Hello my prodcan 55 inch tv will not go out of YPbPr/AV not even with the remote control

Proscan is produced by ON Corp. They are a leading producer for most LCD screens used by a large group of TV makers. Proscan used to be a high end RCA product. The CEO of On Corp was the head of the Proscan division of RCA. After Leaving RCA and Beginning On Corp he purchased the right to the Proscan trade mark. Thus a new beginning for a old name. Many people still belive it to be an RCA TV but it is not. It has good ratings in most reviews for TV's in it price range. It is now a sears brand much like Dynex is a Best But brand.

My proscan did this. I took off the back. Spotted the buldged capacitor. Went to Fry's to find a replacement. They didn't have one but they referred me to someone down the street. Called, he had it. Cost like 2 bucks. Got a soldering kit for 15 bucks. Removed and replaced. And it's like brand new again! 4 years later, the main board is going out :/ that's not so cheap.

hi i'd check the speakers first, test the ohms with a multimeter if ok you could have a bad amp ic on the main board, or a faulty capacitor,thanks shaun

Hi Elissa, Here is the link to the manual online for your television. http://www.manualslib.com/manual/484186/Proscan-42la30h.html

Internal video ccircuit or card is damaged. If you Proscan is on warranty, claim the to change or repair it. If warranty is over and you can't repair it yourself, send it to repair.

Lcd/Backlight! Main Problem On the led,lcd is the Bad lcd ribbon or Bord, Try turning off all the lights and Turning it on, then kneel down to the ground and see if u can see Channels changing when u click up/dwn or volume or even the Fuzzy look when theres no cable going to it. if u can see then its probably a bad board or chip.Hope This Helps :)

hi make sure it's not set up on avl go into the menu scroll down to sound settings select avl to off;hope it works regards shaun

hi go into menu on the tv scroll down to sound setting look for avl set it to off hope it works regards shaun

If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

Usually a voltage in the power supply constantly changing instead of being stable causes this.

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.