Question about Sharp Aquos LC-30HV2U 30 in. LCD Television

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DO NOT WORK

HELLO, PLEASE HELP ME TO GET A POWER SUPPLY BECAUSE A FOUND A FET AND 5 MICROTRANSISTORS BURNED. I AM FROM ECUADOR AND I AM NOT SURE IF SOMECOMPANY SEND FROM ANY WAY THIS BOAR TO ECUADOR

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  • Remy Bonilla Jan 26, 2009

    HELLO I NEED POWER BOARD SHARP LC-30HV2U NUMBER PART RDENCA09WJZZ

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Posted on Dec 18, 2008

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Hi I have a Bush 40 inch flat screen tht is 14 months old and a few days ago it started to take around 10 minutes to show the picture but now it won't show at all the standby light comes on and the...


Hello,
This could possibly be an easy fix. There are a number of troubleshooting steps you can take to isolate where the problem is coming from. Sometimes its a compound problem including fuses, capacitor(s), FET's or simple cold solders on the power supply board. If you are pretty knowledgeable on electronics and testing i can give you some further testing steps. Or you can take the back of the tv and do a visual evaluation for any burns, cap leaks etc. Hope this helps, im here if you need further assistance
-Tim

Dec 31, 2014 | Flat Panel Televisions

2 Answers

No power


What is the exact model number to your Samsung flat panel. Let me check whether it schematic is with me in my system. If it is there, I'll surely upload it to you by Google Drive, from which you can download it. I can't upload it by this window, as it do not allow me to upload pdf files.

Feb 06, 2013 | Samsung Flat Panel Televisions

1 Answer

The Monitor doesn't come on. look like power supply problem.please help me.


first you have to check your power cable if its ok the check fuse,capacitor or fet may shorted or open. you can check these thinks by opening the back cover.if found any part fautly then replaced with same no which is menstion on the part.please handel with care if you do not know how to do this then best go your near service center.

Oct 22, 2010 | Flat Panel Televisions

2 Answers

Hi My tv is hard to turn on sometimes, and when it turns on then after some seconds or sometimes minutes, it turs off and remain on standby. Other times it turns on and runs ok for hours!!. Any help is...


Hello,
All you need to do is to open the back cover of the television to check for dry soldering and bulged capacitor, if found replace with appropriate parts.
You need to check the output voltages of the power supply to see which one goes off. It may be due to short circuits some where.

Good luck in solving the problem.....

Oct 04, 2010 | Flat Panel Televisions

1 Answer

Tv shuts off when you turn it on again it will play a minute


I think this might be bad/swollen capacitors in your power supply, or something odd in the +5VDC circuits of the power supply, but I am posting all of the things I have found so far with these TVs.

Here are few possible solutions:
If you have no red light and you have a Megmeet MLT386 power supply, check these parts:
1) Swollen caps on the PS secondary circuit (may cause the red light blink or shutdown problems).
2) Blown fuse F1 (5A/250V) this is caused by a shorted FET at QA1 (20N60), you may also find that SMT cap CX23 is burned up (.001uf) which is in parallel with diode DA2 which may be damaged/shorted, replace these components.
If the power LED goes from red to green when powered up but no picture, then it might be lost +24VDC from the power supply:
3)Check fuse F2 (3.15A/250V, I put a 5A in), if it is blown, replace FET at QA2A (9N50C), replace QA2 as well (9N50C). Check SMT resistors at R233,R234,R235,R236 (.47 ohm). If open, replace with .1 ohm 1W or 2W resistor (easier to source). Also replace SMT transistor QF1 (2X4 or 2N4401 NPN transistor). And replace diodes at DS2 and DS1 (HER207), DS2 was shorted, DS1 was ok but I replaced it anyway.

I dont know as much about the Megmeet MLT169A, but it has similar problems and similar components.
4) I had to replace all of the capacitors in the secondary circuit (there are six in a 3x3 row marked EC9 (1000uf35V),EC10(1000uf35V),EC14(470uf35V) and EC18,EC19,EC20 (all 1000uf35V).

OK for the Megmeet MLT169A with red flashing LED when turned on we found that IC7 was bad. This is an SMT component on the solder side of the power supply. It is a 4407P (P channel 30V MOSFET). For testing purposes, we jumped across it to feed +5V to the TV permenently instead of allowing +5V to go into standby.

Sep 09, 2009 | Akai LCT3201TD 32 in. LCD Television

1 Answer

TV won't turn onthe red light just blinks when I push the power button.


I think this might be bad/swollen capacitors, or something odd in the +5VDC circuits of the power supply, but I am posting all of the things I have found so far with these TVs.

Here are few possible solutions:

If you have no red light and you have a Megmeet MLT386 power supply, check these parts:

1) Swollen caps on the secondary circuit (may cause the red light blink problem).
2) Blown fuse F1 (5A/250V) this is caused by a shorted FET at QA1 (20N60), you may also find that SMT cap CX23 is burned up (.001uf) which is in parallel with diode DA2 which may be damaged/shorted, replace these components.

If the power LED goes from red to green when powered up but no picture, then it might be lost +24VDC from the power supply:

3)Check fuse F2 (3.15A/250V, I put a 5A in), if it is blown, replace FET at QA2A (9N50C), replace QA2 as well (9N50C). Check SMT resistors at R233,R234,R235,R236 (.47 ohm). If open, replace with .1 ohm 1W or 2W resistor (easier to source). Also replace SMT transistor QF1 (2X4 or 2N4401 NPN transistor). And replace diodes at DS2 and DS1 (HER207), DS2 was shorted, DS1 was ok but I replaced it anyway.

I dont know as much about the Megmeet MLT169A, but it has similar problems and similar components.

4) I had to replace all of the capacitors in the secondary circuit (there are six in a 3x3 row marked EC9 (1000uf35V),EC10(1000uf35V),EC14(470uf35V) and EC18,EC19,EC20 (all 1000uf35V).

Aug 10, 2009 | Akai LCT3201TD 32 in. LCD Television

2 Answers

Dell w4201c burning fuse...


hello, definitely if your fuses are blown and your not able to circut trace and find the fualty compnents on the pb then repalce it with a working power supply this may help but also keep in mind you may want to check everything out first get your models service manual so you can verify voltages at test points. something is cuasing the fuses to blow so if you do change the power board and you blow the fuses again then you will need to trace the circut and find out where the short is and what panel or part is cuasing it .

hope this helps

Jan 10, 2009 | Dell W4201C 42 in. Plasma HDTV

5 Answers

AKAI MLT168A Power Supply


If I give you the values of Z3, Z4 and Z5, would you return the favor by telling me what are the values for R104, R106, R107 and C17?

I have posted this request 5 times for 2 months and no body gave me an answer. Would you be willing to work with me? E-mail me s69joe@hotmail.com and use MLT168A-fixya as subject
Thanks

Sep 27, 2008 | Akai LCT2715 27 in. LCD Television

1 Answer

Will not turn on, only blinking green light


Ok, your on the right track... Check the main fet or fets that is located right by the caps. Normally if the fet is short, it will pop the fuse, but if your caps poped instead, it could have prevented this. With the set unplugged, you can take a meter set to ohms (lowest setting possible) and if you read a value across any of the 3 pins on the fet (short), then it shot.. If that checks out ok, then take a peek at all the other smaller caps that are on the hot side of the board (the bottom of the board will be labled hot and cold. If one of these was out, it would prevent any of the other voltages from being present. The 5v is a standard test signal, it will normally notify the rest of board to power up when there is a draw on it (kind of like a computer power supply). But I highly recommend replacing all the caps on the hot side of the board and it should fix your problems.

Apr 06, 2008 | Akai PDP4294 42 in. EDTV-Ready Plasma...

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