Question about Sharp Televison & Video

1 Answer

Flashing OPC/DL light

Hi there!

I have a Sharp LC-37D5U LCD tv. The unit was working fine. After being on for 3 hours, it turned itself off with an audible click. The OPC/DL led flashes 1x per second constantly. We unplugged the unit from the power source and the light stopped flashing. When we plugged it back in, the power led (blue) will light up, the unit will click twice and then the OPC/DL light will resume flashing 1x per second.

We tried to reset the unit (buttons on rear of tv) - no change.
We left the unit w/o power for 24 hrs - no change.

Some research indicates that the power supply may be faulty. Before I attempt to remove it, can anyone make any additional suggestions. I can't afford to take the unit to a repair shop (been unemployed for a bit), so any help/advise would be greatly appreciated. I have not been able to find much other information on this tv, except for this site. So, I'm hoping you can help me.

Thank you, in advance!

Sincerely,

Murray in Florida

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Here's what I did to fix issues with my 37D5U - do at your own risk:

***Follow the instructions below to fix the same issue in your LC-37D5U tv***

Do this test first to confirm the failure:
(1) Connect the cable line to the tv.
(2) With the tv unplugged, hold down the Input and Volume-Down buttons simultaneously, then plug in the tv.

Expected result:
(a) You should hear the tv come on in the service mode; the OPC/DL and power lights on the front of the tv should turn green and blue, respectively.
(b) The broadcast sound should come through the speakers, but you will probably still have no picture or back light.

If your test yields the expected results, proceed to the fix.


Fix
===

Parts Needed
------------
(1) Part type: Fuse
Location on circuit board: F705
Official Part No: QFS-A1154SNEZ
Replacement Part No: BK/PCB-1-R (Mfg: Cooper Bussmann - about $2) or the original QFS-A1154SNEZ (Distributor: Sears Parts Direct - about $14)

(2) Part type: Mosfet (4 of them)
Location on circuit board: Q723, Q721, Q719, Q717
Official Part No: k3469
Replacement Part No: FQPF13N50C or FQPF13N50CF (Mfg: Fairchild Semiconductor - about $2 each)

Fuse F705 is part of the circuit on the power supply that powers the inverter circuit, and the inverter switches on the back light for the tv. The mosfet at location Q723 was suspect when I tested it, so I went ahead and replaced it and the other three mosfets "chained" to it as preventative maintenance. Parts can be bought from digikey.com - digikey is usually a same-day shipper with the best prices, so I use them. USPS Priority shipping is the best bang for your buck.

Tools Needed
------------
Philips screwdriver
Soldering iron
Desoldering braid or some other solder remover
Light bulb socket that has two wires running from it and a clear 100-watt light bulb - Home Depot sells the sockets. Alternatively, you can use a 2K ohm/10W resistor
Multimeter - not necessary, but helpful

Procedure
---------
(1) **Important: Make sure the tv is unplugged**

(2) Remove the back cover and stand - there are a bunch of screws holding the back cover on. You can either mark the screw locations and bag the screws or do what I did: Unscrew the screws, leaving them in their holes, then slowly lift the back cover off and carefully set it down with the screws intact.

(3) Set the tv on a flat surface with LCD panel facedown and remove the AC power cable.

(4) The board you want to work on is the power supply board (see pic below), which is the board where the AC power cable connects. Carefully detach the connectors that connect to the other boards in the tv from the power supply, then remove the screws that hold the power supply to the back of the tv and lift it off the tv by holding it by its edges.

(5) Locate the four large 450V capacitors at locations C734, C709, C710, and C852 without touching them (they look like soda cans). Flip over the power supply board. Touch each wire of the socketed light bulb or resistor for about 3 seconds to the negative and positive leads of each large capacitor, respectively; polarity is irrelevant. This discharges the high voltage from the capacitors so you don't get shocked while working on the power supply. The voltage usually slowly dissipates on its own, but it's better to be safe than sorry when you're talking about a potentially lethal 450V. Check the voltage with your multimeter in the appropriate DC mode to verify that the capacitor voltage has been drained; if you don't have a multimeter, just continue on.

(6) At this point, you can verify that the fuse at location F705 (looks like a small black box) has indeed failed by holding the multimeter's red and black probes on the fuse's leads with the multimeter in continuity mode. If you have no continuity, the fuse has internally failed; proceed to the next step.

(7) Desolder the fuse from location F705 and desolder the mosfets from locations Q723, Q721, Q719, and Q717 then replace with new components.

(8) Put the power supply board back in the tv, using just a couple screws to hold it in for now. Reattach the connectors to the power supply.

(9) Attach the broadcast cable line.

(10) Reconnect the AC power cable to the power supply (don't plug it into the wall socket). Hold down "Input" and "Volume-Down" simultaneously, then plug in the tv. The tv picture and sound should come on.

(11) With a small screwdriver or other probing device, depress the Reset button, not the System Reset button; it's the last recessed button below the cable jack on the back of the tv. The tv will reset, then you should get sound and a picture from channel 2.

(12) Reinstall the remaining power supply screws, back cover, and stand.

Posted on Dec 30, 2010

  • 1 more comment 
  • hoopguy2 Dec 30, 2010

    Sorry, step 4 mentions a picture, but there is no picture included. The power supply board will be apparent.

  • Alexander  Moore
    Alexander Moore May 04, 2011

    Thank you very much for your professional directions! I did fix invertor's part on power pcb before I tried to power it up. It was more, than a fuse, of course. 2 mosfets were shorted. after all those procedure, still blinks and won't turn on. Next, replaced 5 capacitors in standby power supply. Blinks, bastard! Only with your help of resetting the set, it came back to life, completely.
    I feel a bit obligated to you and I also run TV repair business since 1992. Once in a while getting into this kind of situations, but I do have a big baggage of knowledge about anything what's talking and showing picture. Feel free to contact me. support@alexstelevision.vpweb.com . Sincerely, Alex.

  • RAMilewski Aug 26, 2011

    I had the blinking power light symptom with the TV appearing otherwise dead. Pulling the power plug and then reinserting it with the Volume-Down and Input buttons depressed caused the TV to start normally. It now powers-down and powers-up normally.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Power light comes on along with OCP light. No screen or sound. internal switching noises coming from inside the tv


Sharp TV - Flashing OPC & Power Lights - YouTube

? 0:50
https://www.youtube.com/watch?v=BH1OcQ6dIEE
Jul 1, 2011 - Uploaded by Tweetssun
Sharp Aquos TV flashing a OPC & Power Lights in a pattern of 3 flashes, ... Sharp Aquos LC-32D44 - One blink lamp error - Nopicture or sound - Diagnosis ... Repairing Flat Screen TV - Blacked out with blinking red light ...Missing: 32dv22u

Sharp lcd tv power button flashing - HDTV - Streaming Video & TVs ...

www.tomsguide.com/forum/54708-4-sharp-power-button-flashing

Feb 8, 2012 - 7 posts - ‎3 authors
We have owned a Sharp 32" LCD TV for about two years. ... However a quick Bing search shows that the blinking green light usually means a bad power board, which seems ... No picture, no sound, just a black screen and two blinking green ... a cable surge block on the coax where it comes into the house. Sharp lcd tv power button flashing - Digital TV
19 posts
Oct 14, 2012
Sharp hd tv blinking power no picture - Digital TV
2 posts
Jan 7, 2012
More results from www.tomsguide.com
Missing: 32dv22u

Sharp Aquos LC 42DH77: Inverter, Backlight, Power and ...

www.normsweb.com/tektips/42dh77.shtml

Jan 31, 2016 | Sharp LC-32DV22U Widescreen 32-Inch Class...

1 Answer

Our sharp LC-37D6U does not turn on. The opc/dl light keeps flashing green X3 then every second or so. and the blue power button flashes also. What might we have to do to solve the problem? thank you


The main tv Tuner signal board it is dead or it have problems,but tv still usable.Tries push the remote power switch off/on again everytimes OPC/Power LEDS lights flashes.Have to do this maybe 3 or 4 times for the tv to have a lite up LCD screen panel backlight to make the tv Tuner signal board to work again,for the tv to work.If still have same problems after 3 or 4 times power switch pushes off/on still have OPC/Power LEDS lights flashes.Mean the main tv Tuner signal board it is dead and can not be trying to save it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish tv Tuner signal board for the replacement.This solution 100% will work,if ur tv main Tuner signal board still have life left in it.I do this every few days out of a week for my 46" Sharp Aquo LCD tv set,tv it work all the times.

Jun 12, 2011 | Sharp LC-37D6U 37 in. LCD Television

1 Answer

Aquos model LC46D64U...approx 2 years old..Won't power up and get the power light flashing 3 times then the OPC light once..which is repeated...Any ideas...I believe this is quite common with Sharp TV's


I have a Sharp LCD 46 in.tv do this often.Yes,it is.This problems,the tv Tuner signal board have problem,but the tv is still useable.The POWER and OPC light indications flashes.Just push the power switch again,wait see tv turn,not POWER and OPC flashes again,push the power switch agian and wait.Have to do this like 3 or 4 times sometimes,than the tv backlight will come on,tv will work.Don't know but,if u require to pushing power button more 10 or 12 times,the tv Tuner signal board don't take an turn on the tv backlight get the tv to work.The Tuner signal board is dead,time to replaced the tv Tuner signal board.

Oct 18, 2010 | Sharp Aquos LC-46D62U 46 in. LCD HDTV

1 Answer

THE TV IS CUTTING OFF BY ITSELF AND THE OPC LIGHT IS BLINKING


This problems very common on Sharp Tv.Do ur tv LED power light turn on solid first.Few mins,than LED,OPC flahes.Power LED,OPC flashes,push power button again,do this at leat 5 or 6 times somtimes the backlight will come back on and work.The power LED,OPC light flashes,turn off/on more than 5 or 6 times don't work.Ur Tuner signal board is dead,must replaced.

Mar 30, 2010 | Sharp Aquos LC-42D62U 42 in. LCD HDTV

1 Answer

Sharp LC-26D43U Power light flashes and unit won't turn on?


It's a power supply related problem. When it turns itself off, this it called protection mode. The TV automatically turns off to protect other parts form being damaged.
The most common problem is the Power Supply Unit or the Backlight Inverter Board.
You may have to take the TV to a repair shop to find out which one is bad. Paying a repair shop to replace the board for you maybe more than the TV is worth. If you let them diagnose it and you replace the bad circuit board yourself, it would be cheaper.

Here's a place I use to get parts for TVs:
http://www.shopjimmy.com/catalogsearch/result/index/?q=LC-26D43U&p=1
The problem is the repair shop may charge you double or three times of what the part costs at the web site link above. Then, plus labor. I just want to save you money. :)

Jun 03, 2009 | Sharp LC-26D43U Television

3 Answers

OPC/DL light flashing Same problem of black screen and green lights flashing at power and OPC Help....


WHEN FLAT SCREEN SHARP LCD IS ON .. BLIKNING ON BOTTOM OF SCREEN SAYS OPC

Dec 08, 2008 | Televison & Video

1 Answer

Sharp 42


You either have broken power board or main board. Power board - blinking 2 per second, main board 3 times per second. In an case it has to be fixed by a technician.

Sep 18, 2008 | Sharp Aquos LC-42D62U 42 in. LCD HDTV

1 Answer

No POWER


How many times does the POWER led flash per second? (Dont worry about the OPC).

1x (steady constant blink) = Lamps or inverters
2x = Power Supply
3x = Main Unit

If i am reading it correctly, looks like the POWER led is flashing 2x, which means it is a power supply failure. Either way, your TV needs to have a board replaced, there isn't anything you can do to fix it yourself. Try locating your local sharp authorized service center to repair your TV (1-800-237-4277)

Mar 13, 2008 | Sharp AQUOS LC-32D43U 32 in. LCD...

2 Answers

No picture, but power is on...


How many times does the POWER led blink per sec? (dont worry about the OPC)

2x = power supply (not as expensive to fix)
3x = Main board (expensive to fix)

Oct 20, 2007 | Sharp Aquos LC-42D62U 42 in. LCD HDTV

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

1,413 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharp Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74211 Answers

Jaime Hernandez

Level 3 Expert

2318 Answers

Cindy Wells

Level 3 Expert

5125 Answers

Are you a Sharp Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...