Question about Coby 40 TFTV4028 LCD TV

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Wont power on

When tv is first plugged in it will come on, if you power it off it wont turn back on TFTv4025 coby

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  • 444 Answers

Unfortunately the coby company has gone out of business probably because they have produced an inferior product that has had many, many problems, many people are posting problems with these sets. it is better you just purchase a different brand of tv and leave this heartache causing product behind.

Posted on Jan 24, 2015

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Posted on Jan 02, 2017

SD Tech
  • 14553 Answers

SOURCE: my coby tftv3227 tv won't turn on and has no sound plugged it in new power source and still nothing what to do?

I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.5_27_2012_5_44_12_pm.jpg5_27_2012_5_44_31_pm.jpg

Posted on May 27, 2012

gopakumarg43
  • 74106 Answers

SOURCE: my colby lcd tv tftv4025 keeps blowing the power supply fuse.

There should be a direct short circuited component/s at its main power regulator board. Check for it. To get some information, http://electronicshelponline.blogspot.com/Pull up older posts.

Posted on Dec 03, 2013

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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
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Testing LCD TV Power Supply BoardsSTEP BY STEP

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Hi Michael,
There has been some damage to some components, most probably the electrolytes in the power supply section of your TV. If you can do, please open the back cover and see any bulged electrolyte capacitor on the power board and replace them and if you can not do it, please consult some local TV tech to do the job..

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Fault with main board. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/

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There should be a direct short circuited component/s at its main power regulator board. Check for it. To get some information, http://electronicshelponline.blogspot.com/Pull up older posts.

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1 Answer

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I have a coby tftv4025 volume problems
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1 Answer

Coby TFTV4025 wont turn on


TV will not turn on. At first I coule get it back on and then it would soon go ogg again. Now I cannot get it to turn on. Now a No Signal comes on. Thanks for your help!

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