Comments on: No Power In Philips LCD TV Repaired

By: Taurai Mirimi

Taurai Mirimi — Sun, 19 Jul 2020 18:58:06 +0000

Great share. Thank you.

Have similar problem with a big screen tcl tv. Has a black screen but you can hear it boot. The oz9976 I suspect but the IC has a zero volt print wiring on pin 2and pin 15. The 12v is supplied on the zcs pin. I wonder how this was working. Could not find a detailed datasheet on this ic

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By: Bates

Bates — Tue, 07 Apr 2020 23:24:10 +0000

sir, thanks for sharing knowledge. I've done replacing CW2 & CW4. Upon switch on, the 100w bulb connected to fuse keep on & off with clicking relay sound. I've notice there's two same blue caps were blacked colour located at CH1 & CH2 but cant get the caps number coz its burnt. Please advise.

Thanks in advanve

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By: samuel

samuel — Mon, 23 Oct 2017 19:13:02 +0000

i greet you people in this house please i have problem with my philips 32" model 32PFL3406S/98 it does not power on no standby no backlight voltage no power entering the main board when i connect the power supply to the main board the voltages on the power supply drops eg 12v drops to 5.6v while the 5v drops to 3.3v any solution will be appreciated SAMUEL

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By: ombra32

ombra32 — Fri, 01 Jul 2016 11:01:04 +0000

Very good article..thank you!!

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By: Zed

Zed — Thu, 23 Jun 2016 07:33:09 +0000

Thank you Mr. Sk Wong nice sharing of your repairs.Thanks alot.

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By: Humberto

Humberto — Mon, 13 Jun 2016 16:50:32 +0000

Hi SK Wong. I liked your article a lot. Keep up sharing your expertises.

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By: Humberto

Humberto — Mon, 13 Jun 2016 16:44:31 +0000

In reply to henry.

Hi Henry, you are right, but remember it's not so easy to solve the schematics nowadays.

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By: Paris Azis

Paris Azis — Mon, 13 Jun 2016 06:02:40 +0000

Good job and interesting repair case, SK Wong. According to my experience this is rather a rare case (the failure of the H.V disk caps I mean). I believe that their original voltage rating is good enough to withstand the anticipated H.V spikes likely to appear at the drain terminal of the mosfet, but it seems that the quality of these caps was not good. Every time I face a failure in similar stages, it works like a habbit to me, I always measure the DC voltage at the snubber circuit, at the connection point of the cathode of the diode with the snubber cap. This is a vivid indication of the effectiveness of the snubber circuit which is responsible to keep the drain voltage of the swiching device at a safe level, according to the topology used. This is my main argument about the quality of those caps I referred to.
The above measurement,and perhaps further modification of the snubber network, is absolutely necessary whenever the power switching device is replaced by an equivalent instead of the original device, especially if the switch is a BJT...Anyway, this is a very long story...

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By: henry

henry — Sun, 12 Jun 2016 06:45:54 +0000

Nice article and well presented too. I am finding it very helpful (and also very educational) when the article includes a schematic (even part of it) while explaining the diagnostics procedure steps and shows the location of the failing components in the circuit diagram. Thank you SK Wong and others who follow this good practice.
After all the purpose of this commendable blog is to share the knowledge, promote electronics repair art and joy, and also to provide a learning opportunity to others who are interested and want to learn.
I know that the schematics are not necessarily always available but the writers of the articles on this blog should, whenever possible, try and make an effort to include them in their presentations.
I hope other readers also see the benefit in this and agree with me.

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By: suranga bandara, Suranga Electronics

suranga bandara, Suranga Electronics — Fri, 10 Jun 2016 09:46:30 +0000

Good work Mr -SK Wong,
You have shown your expertise.
Thanks.

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