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Sharp Roku 58" troubleshoot backlight issue.

My Sharp LC58Q7330U does not stay on. The standby light blinks twice red then shuts off (I can see the startup picture by shining a light through the back where the backlight wires run.) I put a MM on the wires and seen high voltage during startup, but drops steadily down to 0 volts when trying to power on. Should I be looking to replace the powerboard or backlight...or? I dont want to take apart till parts are order and job is to be done

Posted by Drew Valdivia on

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Tom Chichester

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Your troubleshooting has isolated the problem to power supply failure.

Posted on Jun 26, 2021

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Have a LG 55ls5700 tv that doesn't turn on but the red standby comes on and when i press the power button it starts to blink

Does the screen quickly blink on and then off? Does the standby light slowly blink twice and then go out?If these are the symptoms then it is probably a bad led backlight strip.This was the fault with my lg 47ln540v led lcd tv.I have written this up in a previous post more comprehensively.Hope this helps..
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Pn43d490 clicks blinks red light twice and will not turn on

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While setting up the Crest Universal remote control RCP1F for my sharp TV, I've managed to turn the TV off, but now I can't turn it back on. The TV remains on Standby and turning off the power doesn't do...

OKAY TRY THIS..
DO STEPS 1-3 AGAIN AND ONCE IT TURNS OFF KEEP CLICKING THE CURSOR UP A COUPLE TIMES.
THEN START CLICKING THE CURSOR DOWN SLOWLY TELL THE TV TURNS BACK ON AND ONCE IT CLICKS BACK ON HIT THE TV BUTTON ON THE TOP OF THE REMOTE ..
IF THE LIGHT BLINKS TWO OR THREE TIMES MORE THEN LIKELY YOU'VE PROGRAMED IT =)
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Universal remote - program digital converter box and Roku?

if you still have your remotes you can program the buttons for each funtion.
1. Hold down P until the red light blinks
twice.
2. Press 9 7 5. The red light blinks twice.
3. Press the device key that corresponds with
the desired device's remote (TV, CBL/SAT,
DVD, VCR or AUD).
4. Press the desired learning key. The red light blinks rapidly.
5. Place the device's remote control head-to-head
(about 2 inches apart) with the
11
Gamer Remote.
6. On the device's remote control, hold down the key to be learned until the red light on the Gamer Remote blinks twice. If the red light does not blink twice, repeat Steps 1- 5.
7. To lock in learned functions on the Gamer Remote, hold down P until the red light blinks twice.
8. To test a learned function, press the learned key on the Gamer Remote and use the function as usual.
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How do you tune Sky+ remote into Sony KDL46W5710 Television

The Sky+ remote should automatically default to Sony TV's. Leave the batteries out for a few minutes and try again. The Code for Sony is 0000.
Or try this :-

With TV and sky box on.
Press the 'TV' button on the remote.
Hold down the 'select' and the 'red' button (of the four coloured buttons) together, until the red light on the remote blinks twice. (takes 2 seconds)
Press the 'TV' button again.
Now enter four zeros, the red light on the remote should blink twice.
Press the 'standby' button (top right).
If the TV turns off, then press 'select' and the light should blink twice again, job done.

If the TV does not turn off then press 'TV' followed by 'standby' again.
Alternate pressing 'TV' 'Standby' until the TV turns off.
When it does, finish by pressing 'Select.
Check the red light on the remote, if it blinks 3 times, then it has run out of options for 0000.


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Are you putting the lamp cover back in place before trying to turn the set on? The 2 blink error is a temperature error you might want to check the thermal sensor, is your lamp door warped?
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Have already posted this fix twice, but to be sure hunglam_1999 receives notification, doing so again 27Oct2009:

Most common failure is the audio amp IC, reference # Q5001, which is an STK402-950 (Onkyo Pt. # 222123). Typically fails as a result of excessive volume levels or as a result of problems with the speakers or their wires. If you're technically inclined, the part can be had from various vendors & is fairly straightforward to replace once the complex disassembly required to access the PCB this IC resides on is accomplished, using standard soldering skills. A repair of this type by a reputable servicer may be more effective for non-technical folks, as typically can be accomplished for $200 or less, much less than replacement cost...
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Horizontal Out Transistor or Flyback Transformer seems bad. check n replace please.
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