Comments on: Electronics Repair Questions/Answers and Testimonials- Part 81

By: Jestine Yong

Jestine Yong — Mon, 10 Aug 2015 05:58:31 +0000

Hi Ssali,
I'm fine thanks. I have not fixed this kind of kit before thus I can't comment about it. What I know is that usually display logo is kept in the memory IC.

Jestine

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By: Engineer SSali

Engineer SSali — Sat, 08 Aug 2015 08:37:48 +0000

Hi Master Jestine, how are you doing
I have just installed a new universal tv kit
single ic 8895, I would like the power on logo display on screen to match with the housing
how can I change the display logo?
Thanks....

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By: admin

admin — Sat, 25 Jun 2011 23:13:47 +0000

Hi Gary,

One of the baccklight should have problem because if the backlight fail the display will shutdown in few seconds.

Jestine

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By: Gary

Gary — Sat, 25 Jun 2011 14:38:51 +0000

I have a Viewsonic VP171 monitor. It turns on for about a second and then goes black. The power LED stays green and though the display is dark, I can see with a flashlight that it is still working. On the inverter board, I replaced all capacitors, the two power MOSFETs, the BA9741 switcher I.C., and all CCFL's. The 3A fuse on the board is okay too, and the transformer connections are all fine...I hit it all with a soldering iron to make sure there were no cold solder joints. Using an ohm meter, the 2 transformers measure identically.

However, the problem still exists. I've tested it with both VGA and DVI connections. Any suggestions on what to try next? I'm out of ideas.

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By: admin

admin — Wed, 22 Jun 2011 00:06:14 +0000

Hi Daniel,

If the transformer is small and have less winding then it is normal to have 2 LEDs lighted up. If you have an inductance meter then it will be good because generally the higher the inductance the higher will be the tester Leds.

Jestine

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By: Daniel F

Daniel F — Tue, 21 Jun 2011 04:55:39 +0000

Jestine,

I've got a small transformer from a plasma television that I suspect faulty.
Trouble is I can find no replacement and have no idea how to rewind one.
I would have a go at rewinding if I new for sure the transformer was faulty.

It is only a small transformer, about 1" square, but it lights up only 2 red lights on the Blue Ring Tester.
I would normally think it's faulty but given that the transformer is so small, I wonder whether I would see any reading on the Blue Ring Tester!

What do you think? have you had small transformers that don't light up the BR Tester but yet are good transformers?

The numbers on the transformer are DK07A 50428T

Thanks
Daniel F.

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