Question about Insignia LCDTV26 26 in. Television

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IS-TVHD30 hi im having the same trouble with the same tv no power but a low clicking noise there looks to be 2 diodes that look burnt but i can't find a service manual i've been searching for days can you posibly help thank you mike ps used lcdtv26 because tvhd30 kept coming up as a invalid product

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  • sellarsaz Jun 07, 2008

    Our Insignia IS-TVHD30 shut off while kids were playing a game.

    Took off the back panel to see if I could see any burnt out or black diodes. All took good and the fuse looks good. It is making a clicking noise when the unit is plugged in and the fuse is in place. If I take the fuse out the noise stops.

  • azrez Sep 15, 2008

    I have the same low level "clicking problem" and no power to the TV. The possible problem is a burnt power supply. I have yet to take it out of the armoire to investigate.

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I fixed the problem with the "no power on, low clicking noise". The NPN transistor (2SC5931) was shorted. This transistor controls the horizontal hold. The shorting caused the power supply to overload and restart, then recycle. This was the cause of the clicking noise. Unfortunately this transistor was over $50, most likely due to the extinction of CRT's. I did find a replacement transistor 2SC5552, which only cost $2 (but I was able to get it in Mexico). The location of the transistor is located on the left side of the TV (looking from the back). Directly in front of it is the high voltage transformer which powers the CRT (should have a thick red wire). The transistor is attached to a large aluminum heatsink. To remove the transistor you will have to remove the entire electronics assembly to you can easily get to the underside. This was the solution for my TV, but there could be other components damaged.

Posted on Sep 30, 2008

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I woke up this morning and noticed mine had the green light flashing- when i got home from work i tried to turn it on but no power, only green light flashing and a clicking sound every second, unplugged it for a few minutes- now i dont even get the flashing light.

Posted on Aug 13, 2008

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Ln52a650a1fxza keeps powering on, off,on etc caps looked good, but, replaced anyway-- checked diodes all ok outputs on cn801 all ok same problem persist Any suggestions thanks


Hi,
this is a problem with this model with a manufacturing date between:2/2007 and 4/2008 and that it was related to a faulty batch of capacitors.Samsung have been extending warranties for some customers to save face a little, have a look here for more info:
Samsung TV Keeps turning off and on Forums CNET

Feb 09, 2016 | Televison & Video

Tip

Shorted Rectifier Diode (fuse keeps blowing)


jdvillanueva_14.jpg
This CRT tv is dead set, no reaction when the power button is pressed(no standby led light). I've open the back panel and check the faulty parts.
jdvillanueva_15.jpg

As you can see the fuse was badly burnt-out indication of excessive current due to short circuit.
jdvillanueva_17.jpg

I've checked the parts feeding the AC line to the power supply board (Power cord, VDR, Ceramic capacitor, Coil, Posistor, Degaussing coil) one by one and I've found out that one of the four rectifier diode has a leak which caused the glass fuse burnt-out.
Here's how to test the rectifier diode.

Good Diode
Note : Forward and reverse bias depend on what type of ohmmeter are you using, here I'm using a Japan Standard(Sanwa Brand).
jdvillanueva_21.jpg

Using an ohmmeter set it to X10 to see much easier the leak from the diode in reverse bias.

Forward Bias : test the diode by connecting the red test prod of the tester to anode and then the black test prod to cathode of diode. You will see the pointer will reads a faily low resistance(above picture).
jdvillanueva_22.jpg

Reverse Bias : test the diode by connecting the red test prod of the tester to cathode and then the black test prod to anode of diode. You will see at the picture(above) that the pointer didn't react (remains in infinity). This is a good diode.


Bad(leaky) Diode
jdvillanueva_23.jpg

Forward Bias will reads fairly low resistance.
jdvillanueva_24.jpg

Reverse bias unlike the good diode the pointer will also reads a fairly low resistance.

After confirming that the diode caused the fuse from blowing I've decided to replaced all four diodes since I have a lots in my stocks.
jdvillanueva_25.jpg

Remember that when you installing the new diode on the board, make sure that you will make it in the right polarity.

jdvillanueva_26.jpg

This steps is also applicable in the DVD Player,Flat panel, Projection, LCD TV, you have to disregard only the posistor and degaussing coil.

Have a nice day!
Thanks for using Fixya.

Jdvillanueva

on Mar 02, 2011 | Televison & Video

1 Answer

The fuse of my Akira 14'' tv got burnt. i want to know if it might have destroyed any other ic in the tv set.


Hi ,

This is an indication that you have a short on the power supply section.It can't be fixed by replacing the fuse alone. Short usually near the AC line where parts like the following are present.

  1. Power Cord - even very low of chances but still to be check.
  2. Posistor and degaussing - even very low of chances but still to be check.
  3. Rectifier diode
  4. Main filter electrolytic capacitor
  5. Voltage regulator I.C.

This is the common parts that might be shorted and made the fuse blew. #2-5 is quite technical and need an expert to do the job so I've advice you to look for a qualified technician to isolate the problem. You may visit the link http://www.fixya.com/support/r8053361-fuse_keeps_blowing for more info.
Check also if your unit is under warranty, avail it because the manufacturer will fix it for free or a little charge only.


Hope it may help you.
Have a nice day!

Feb 16, 2011 | Televison & Video

1 Answer

Insignia tv-30 inch ---model is-tvhd30 has burned capacitor-c359--need to know the value in mfd's.


If it is in the power supply better check the rest of them. most should all be the same value so you may be able to get the value for the burnt one from that. good luck

Apr 24, 2009 | Insignia I-LC23Q1 23 in. HD-Ready LCD...

1 Answer

Continuous click noise like its trying to turn on but will not.


I have done some research and found a notorious cap and diode problem with this set. The two 4700uf caps (C14113 and C14115) on the DM1 power board (the board to the left of the sat. box when you look at the set from the back) are under rated and will eventually fail. When these caps fail they tend to take out diode CR14105. This may be your problem. If it is, you can replace the caps with 4700uf 25V 105c and the same as original diode.

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Sounds like power supply problem (either poor connections or bad capacitors).sometimes they look deformed or you have to check them with an incircuit capacitor tester.

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I, need the exact model no. to see if you can get part for it . need also to know if it uses an external power adapter thanks

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1 Answer

JVC AV-27820 27" TV


Im sorry your having this trouble But I cant tell you whats wrong as I havent looked at the set. The problem could be a simple power supply problem or a cold solder connections in the horizontal sweep circuit. If your not a tech this is not a job for an experimenter or tinker . There is hi voltage in these sets even when they are unplugged so you are gonna need to call a pro in to assit you in this repair or geta new one > good Luck

Jun 11, 2006 | JVC AV-27820 27" TV

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