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tvc sharp LC-32LE144E main 32LE244_main BD Rev: 1.02 only red led stand-by

misterbinn 8892 16
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Why does a Sharp LC-32LE144E stay on the red standby LED and not respond to the power button or remote even though 5 V is present?

Check the U2 and U3 regulator outputs first: they should be 1.3 V and 1.8 V; in this case they measured 2.2 V and 0 V, and replacing both ICs restored the missing rails and allowed the TV to start [#18651478] [#18652720] Before replacing them, make sure there is no short circuit downstream of those ICs [#18653001] [#18655246] Reprogramming or replacing the flash did not solve the original no-start fault [#18652720] After the voltages were fixed, the set could still freeze with audio/image noise, and a software update from Sharp was suggested [#18677990] [#18678071] The poster reported that updating from the Sharp site resolved the issue [#18683081]
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  • #1 18647557
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    hello everyone, in this tv the red led remains always on steady, and it does not light up either from the on-off button or from the remote control, the 5v are present, can it be a flash memory problem or other problems?
    thanks
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  • #3 18651478
    VINZA
    Level 20  
    Posts: 237
    Help: 49
    Rate: 160
    Hello, check the output voltages from U2 and U3, they must be exact, otherwise replace the corresponding integrated. Many defects of these frames are to be attributed to these 2 ic.
    Here the wiring diagram with the exact voltages.
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  • #4 18652321
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    hello, in fact I was thinking I give U2 and U3 the first one delivers 2.2v and the second 0v, I see if I can recover them from some card, I replace them and I update you

    thanks
  • #5 18652332
    bazi1962
    Level 21  
    Posts: 500
    Help: 21
    Rate: 142
    misterbinn wrote:
    could it be a flash memory problem or other problems?

    Of course it can.
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  • #6 18652720
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    in fact I also tried to reprogram the flash several times even replacing the chip but without results, then measuring the voltages I realized that U2 delivers 2.2v instead of 1.3v and U3 delivers 0v instead of 1.8v so first you need to restore the two voltages replacing both U2 and U3
  • #7 18653001
    VINZA
    Level 20  
    Posts: 237
    Help: 49
    Rate: 160
    Before replacing the integrated circuits, check that there is no short circuit downstream of them.
  • #8 18655246
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    after removing U2 and U3 I checked the presence of any output short circuits but fortunately everything is normal, as soon as available I will replace them and update you
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  • #9 18677990
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    hi, I replaced U2 and U3, now the voltages 1.3v and 1.8v are present, the TV only turns on that sometimes it freezes with a loud audio noise and noise on the image, it no longer responds to commands, in this phase it does not the 1.8v are present because the enable voltage is missing by disconnecting the mains plug and reattaching it it turns on and works normally, it has been on for several hours now it is ok, I think of a problem on the processor, possibly the main is to be replaced, let's see how it goes
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  • #10 18678071
    VINZA
    Level 20  
    Posts: 237
    Help: 49
    Rate: 160
    Hi, try to update the software.
  • #11 18678219
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    Can't find a file to flash via USB?
  • #13 18678653
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    update performed, is this enough or is it better to flash the eprom with the 8 mb bin file?
  • #14 18678808
    VINZA
    Level 20  
    Posts: 237
    Help: 49
    Rate: 160
    It's enough.
  • #15 18683081
    misterbinn
    Level 7  
    Posts: 65
    Rate: 7
    I updated from the sharp site now okay, thanks for the advice
  • #16 20052434
    SimoneFerri
    Level 2  
    Posts: 2
    a me è capitato ic u4 sulla main board in corto si surriscaldava da bruciar
  • #17 20741466
    flashh
    Level 25  
    Posts: 1010
    Help: 18
    Rate: 30
    I'll connect to the topic. The effect is that only the LED lights up and there is no reaction to ON. I bought W25Q64FVSIG and I've been loading various loads but with no effect. Voltage OK. Are there any other faults of this type in this model? Surprisingly, there was no indication that the original memory was damaged because I read it and saved the batch without any problems.
    Maybe you have some ideas
    Regards
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Topic summary

✨ The discussion revolves around a Sharp LC-32LE144E television that remains in standby mode with a steady red LED light. The user suspects a potential issue with the flash memory or other components. Responses suggest checking the output voltages from integrated circuits U2 and U3, which were found to be incorrect. After replacing these components, the user reported improved voltage readings but encountered new issues, including freezing and audio noise. Suggestions included checking for short circuits, updating the software, and flashing the EEPROM. Ultimately, the user successfully updated the TV's software from the Sharp website, resolving the initial problem.
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FAQ

TL;DR: Sharp LC-32LE144E no-start is often power-rail related: 2 critical rails (1.3 V and 1.8 V). "Many defects... attributed to these 2 ic." Fix by verifying U2/U3 and updating firmware. [Elektroda, VINZA, post #18651478]

Why it matters: This FAQ helps LC-32LE144E owners and bench techs quickly isolate no-start and freeze faults without guesswork.

Quick Facts

How do I fix a Sharp LC-32LE144E that only shows a red standby LED?

Start with the mainboard low-voltage rails. Verify U2 and U3 outputs measure 1.3 V and 1.8 V. If either is off-spec, replace that regulator IC. “Many defects… attributed to these 2 ic.” Use clean soldering, and recheck each rail after replacement. This simple path resolves many red-LED-only cases. 1. How-To: 1) Locate U2/U3 on the mainboard. 2) Measure outputs to ground. 3) Replace any regulator not meeting spec. [Elektroda, VINZA, post #18651478]

What are the correct U2 and U3 voltages on this model?

U2 should output 1.3 V and U3 should output 1.8 V. The technician’s guidance was clear: they “must be exact,” or the set may not boot. If either rail is wrong, replace the corresponding IC and verify again before further steps. Stable rails are a prerequisite for any firmware or flash work. [Elektroda, VINZA, post #18651478]

Should I check for shorts before replacing U2/U3 regulators?

Yes. Isolate the regulator outputs and check for downstream shorts to ground. Replacing regulators into a short risks repeat failure and wasted parts. Only proceed with regulator replacement after confirming no shorts exist on the 1.3 V or 1.8 V lines. This saves time and protects the new ICs. [Elektroda, VINZA, post #18653001]

Can a bad flash memory cause the no-start symptom?

Yes. A contributor confirmed that flash memory can indeed be the culprit for no-start behavior. However, do not assume it first. Confirm the power rails are correct, then consider the SPI flash if symptoms persist. “Of course it can.” [Elektroda, bazi1962, post #18652332]

I reprogrammed/replaced the SPI flash and it still won’t start—what next?

Verify the power rails before further flash work. One repairer reflashed multiple times with no improvement, then found U2 at 2.2 V and U3 at 0 V. Restoring the 1.3 V and 1.8 V rails resolved the core issue. Reflash attempts won’t help if regulators are out of spec. [Elektroda, misterbinn, post #18652720]

After replacing U2/U3, the TV turns on but sometimes freezes with loud noise. What’s happening?

During the freeze, the 1.8 V rail disappears because its enable signal is missing. The set becomes unresponsive and requires a mains power cycle. This points to a control or software state issue once the basic rails are otherwise correct. Observe enable behavior when the fault presents. [Elektroda, misterbinn, post #18677990]

Where can I download the firmware for LC-32LE144E and update via USB?

Use Sharp’s official download center for the LC-32LE144E. Download the model-matched package, copy it to a USB stick, and follow the included instructions. Community members pointed to the Sharp portal for the needed files and performed updates from there. [Elektroda, VINZA, post #18678588]

Is the USB firmware update enough, or should I also reflash the EEPROM bin?

The USB update is sufficient. A technician confirmed that a normal software update resolves the issue without requiring a full EEPROM rewrite. Reserve full dumps for deeper corruption scenarios after rail verification. [Elektroda, VINZA, post #18678808]

Did updating the software actually fix the freezes in this case?

Yes. After replacing U2/U3 and then updating from Sharp’s site, the original poster confirmed the set was “now okay.” This sequence restored stable operation after intermittent freezes and noise. Update once rails are confirmed correct. [Elektroda, misterbinn, post #18683081]

What if U4 gets hot or appears shorted?

Treat an overheating U4 as a shorted IC and replace it. One repair case reported U4 on the mainboard ran so hot it nearly burned, indicating an internal fault. This is an edge case compared to U2/U3 regulator issues. [Elektroda, SimoneFerri, post #20052434]

Which SPI flash IC is reported on this board?

A reported unit used a Winbond W25Q64FVSIG 64 Mbit SPI flash. If you swap it, back up the original contents first. Reprogramming alone may not fix no-start if rails are out of spec. [Elektroda, flashh, post #20741466]

What standby voltages should I check before power-on?

Confirm the 5 V standby rail is present on the mainboard. In the discussed case, 5 V standby was present even though the TV stayed in standby. That steered diagnostics toward the mainboard regulators rather than the power supply. [Elektroda, misterbinn, post #18647557]

How can I tell if the 1.8 V rail is being disabled?

Watch the 1.8 V line during the fault. If the set freezes and the 1.8 V disappears, the enable signal is not asserted. This matches field observations and explains the unresponsive state until power is cycled. Track enable to identify the control path issue. [Elektroda, misterbinn, post #18677990]

What size is the full EEPROM dump often referenced for this mainboard?

Users discuss an “8 MB bin” when referring to a complete EEPROM image. That size aligns with 64 Mbit SPI devices used on similar boards. Only attempt full reflash after rail verification and a standard software update. [Elektroda, misterbinn, post #18678653]
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