Comments on: Simple LED Circuit https://jestineyong.com/simple-led-circuit/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Fri, 24 May 2013 02:54:46 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: Jestine Yong https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-192537 Fri, 24 May 2013 02:54:46 +0000 https://www.jestineyong.com/?p=3330#comment-192537 In reply to Raghunadhan C P.

Hi Raghunadhan,

Make sure the supply voltage is good and stable and you have applied heat compound. Try resolder all the surrpunding components too. If the ic breakdown again then possible vertical yoke coil could have a minor short circuit.

Jestine

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]]> By: Raghunadhan C P https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-192524 Thu, 23 May 2013 10:17:24 +0000 https://www.jestineyong.com/?p=3330#comment-192524 Hi Mr.Jestine
I received a sony TV KV-J 21 with a fault of single horizontal line. I replaced the frame IC TDA 8172. It worked for five minutes, then slowly the raster started shrinking from the top as if the whole raster is moving down. After some time it become a single line. I replaced two new ICs. But the fault is the same. Could you fell me what can be the problem
Raghunatan.

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]]> By: Jestine Yong https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-190946 Fri, 03 May 2013 02:09:16 +0000 https://www.jestineyong.com/?p=3330#comment-190946 In reply to OLA460.

Hi OLA,

You need to get the schematic to find the value. Or you can get an estimate value base on the schematic diagra on other model that use the UC3842 IC.

Jestiine

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]]> By: OLA460 https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-190322 Wed, 01 May 2013 09:45:42 +0000 https://www.jestineyong.com/?p=3330#comment-190322 pls i dont known the value of resistor that couple my power ttransistor and ic uc3842 together pls tel me am waiting have not said this before pls help

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]]> By: OLA460 https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-190273 Wed, 01 May 2013 07:04:27 +0000 https://www.jestineyong.com/?p=3330#comment-190273 my acer laptop charger have faut when i open it the transistor and resistor that switch the transistor on damage pls what cause it

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]]> By: admin https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-28741 Sun, 18 Sep 2011 21:58:50 +0000 https://www.jestineyong.com/?p=3330#comment-28741 Hi Benedictus.

It can be dry joints in the vertical section or some shorted components in the mainboard. You need to make sure it has good output voltages.

Jestine

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]]> By: Benedictus https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-28470 Fri, 16 Sep 2011 03:18:53 +0000 https://www.jestineyong.com/?p=3330#comment-28470 Hi Jestine...
I have a Sharp Tv. When I power it on, the power LED blinks three times and then goes off. What do U think is the problem?

Keep up Ur good work...

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]]> By: admin https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-28311 Wed, 14 Sep 2011 22:57:14 +0000 https://www.jestineyong.com/?p=3330#comment-28311 HI Benedictus,

Most circuit can work but to some it require the original part number. As for the capacitor, i suggest that you use back the same value. 0,1 uf value gap is too big with the original value.

Jestine

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]]> By: Benedictus https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-28263 Wed, 14 Sep 2011 13:16:23 +0000 https://www.jestineyong.com/?p=3330#comment-28263 Thanx. I've checked all d other components. They seem to be good.
Is UC3842 same wit KA3842?
Secondly, can I replace a 0.022uF, 275V bypass capacitor with a 0.1uF, 275V capacitor?

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]]> By: admin https://jestineyong.com/simple-led-circuit/comment-page-1/#comment-28255 Wed, 14 Sep 2011 12:23:23 +0000 https://www.jestineyong.com/?p=3330#comment-28255 HI Benedictus,

I suggest ttaht you check all the components in it. When the power fet shorted the power ic will give way too.

jestine

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