Skyworth 65UB7500 5800-A9K25G-0P00 no HDMI or AV inputs after firmware flash

User question

TV Model: Skyworth 65UB7500Main Board Number: 5800-A9K25G-0P00 (Version: 00.05)Problem Description:The original issue with the TV was that it had no sound. To fix the audio problem, I flashed/installed a new software firmware.After completing the software installation, the TV powers on, but all the input sources have disappeared. The input menu does not show any options like AV or HDMI anymore.I tried to factory reset the television, but it did not restore the original settings or bring back the input sources. Before flashing the software, the inputs were working perfectly, but now they are completely missing.

Artificial Intelligence Response

Direct answer to the question

Your Skyworth 65UB7500 is almost certainly running firmware or option data that does not match the exact TV hardware configuration. The TV boots because the software is close enough for the main processor, but the firmware/EEPROM/NVM configuration no longer enables the physical input ports, so HDMI/AV/TV sources disappear from the source menu.

A normal factory reset will usually not restore this, because it resets user settings, not the low-level model/project ID, panel data, input map, or factory option bytes.

The correct repair path is:

1. Do not keep trying random firmware files.
2. Identify the firmware currently installed.
3. Obtain the correct recovery/loader firmware for Skyworth 65UB7500 + main board 5800-A9K25G-0P00 + your serial/region.
4. Reflash using the full USB loader/recovery package.
5. If inputs still do not return, enter the factory/service menu and restore the correct Project ID / Model ID / input option data.
6. If service-menu correction is not possible, the EEPROM/NVM/eMMC option data may need to be rewritten with a known-good dump from the same model/board version.

The board number you gave is consistent with a replacement main board listing specifically described as 5800-A9K25G-0P00 Skyworth main board 65UB7500, so the board/model combination itself is plausible; the failure is most likely software/configuration, not a sudden HDMI hardware failure. (shop.technodrive.co.za)

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Detailed problem analysis

What likely happened

Modern Skyworth Android TVs use the same or similar main board families across several screen sizes, regions, and feature sets. The firmware does not merely contain the Android operating system; it also contains or depends on factory configuration data such as:

• Model ID / Project ID
• Panel type
• Backlight and LVDS/V-by-One/eDP configuration
• HDMI/AV/tuner input enable flags
• Audio amplifier configuration
• Region/tuner standard
• Remote-control and keypad mapping
• Factory option bytes stored in EEPROM/NVM/eMMC

When you flashed new software to fix “no sound,” one of the following probably occurred:

Possible cause	Result
Firmware for another model/size was installed	TV boots, but hardware map is wrong
Firmware for another region was installed	AV/HDMI/tuner options may be hidden
Project ID changed	TV believes it is a different model
EEPROM/NVM option data was overwritten	Physical ports are not enabled in software
Incomplete/incremental firmware used instead of full recovery firmware	Android boots, but factory configuration remains incorrect

This symptom is very typical of a configuration mismatch: the inputs do not just show “No Signal”; they are completely absent from the menu. If the HDMI receiver IC had physically failed, the TV would usually still show HDMI1/HDMI2/HDMI3 in the source list, but selecting them would give “No signal” or a black screen. Missing sources point much more strongly to firmware/model-option data.

A Skyworth 55UB7500 firmware page shows a USB loader file named upgrade_loader_common_user_SW3_sa_20200911.pkg, but that page is explicitly for the 55UB7500, not the 65UB7500. The same page’s comments include a user reporting a very similar post-update condition: no TV settings, no HDMI options, and Source showing only Google TV; the response asks for the exact model/serial and mentions recovery software. That strongly supports the conclusion that the fix requires model/serial-specific recovery firmware, not another generic update. (skyworthphilippines.com)

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Current information and trends

Current publicly visible Skyworth support-style information still shows that:

• Skyworth TVs rely on the Source/Menu path to access TV input functions, HDMI, AV, and TV mode. If the input list is empty, this is abnormal and not just a normal Android TV navigation issue. (skyworthusa.com)
• Skyworth’s public firmware instructions for a related UB7500 model use a USB FAT32 method with the firmware file placed in the USB root directory, then the TV is power-cycled to start the update. However, that example is for the 55UB7500 and should not be assumed compatible with the 65UB7500. (skyworthphilippines.com)
• Common Skyworth service-menu access information lists Source + 3195 as a factory/service menu entry method, although exact availability depends on firmware and remote type. (factory-reset.com)

The practical trend in TV repair is that many “firmware” problems are no longer solved by only replacing a .bin file. On Android TVs, the repair often requires the correct combination of:

• Loader firmware
• Panel/project option data
• EEPROM/NVM dump
• Sometimes eMMC reprogramming

This is why a factory reset is often insufficient.

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Supporting explanations and details

Why factory reset did not fix it

A standard factory reset usually clears:

• User apps
• Wi-Fi settings
• Account data
• Picture/audio preferences
• Android system settings

It usually does not restore:

• Original Project ID
• Panel ID
• Input-source enable table
• Factory option bytes
• EEPROM calibration
• Board-specific NVM data

Therefore, if the firmware flash changed the hardware configuration layer, factory reset will not bring back HDMI/AV.

Why the original “no sound” may return after correct firmware

Once the correct firmware is restored, the original no-sound fault may come back. That means the first problem was probably separate from the missing-input problem.

Original no-sound causes to check after the input issue is repaired:

Area	What to check
Speakers	4–8 Ω typical resistance, no open/short
Speaker connector	Loose or oxidized connector
Audio amplifier IC	Burn marks, overheating, shorted output
Amplifier supply rail	Usually 12 V or 24 V depending on design
Mute/standby pin	Stuck mute signal from processor
Headphone jack / optical setting	TV may think headphones/external audio are active
Software audio option	Wrong speaker mode or digital-audio setting
EEPROM option	Wrong audio amplifier type selected

But first, restore the correct model configuration. Do not troubleshoot audio until the inputs return, because the current firmware state is already invalid.

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Practical guidelines

Step 1 — Record current software information

From the TV menu, record or photograph:

• Model shown in About/System
• Software version
• Build number
• Android version
• Serial number
• Board number: 5800-A9K25G-0P00
• Board version: 00.05
• Panel sticker number, if accessible

Skyworth North America’s FAQ indicates the software version is typically found through Home → Settings → Device Preferences → About → Software Version, and serial information through About → Status. Menu wording may vary by region. (skyworthusa.com)

Step 2 — Identify what firmware you installed

This is important. Check the firmware filename you flashed.

If it was for:

• 55UB7500
• 55UB6000
• Coocaa variant
• different country/region
• same board but different screen size
• generic 5800-A9K25G firmware

then it is likely the wrong package.

For your case, the correct firmware must match more than just the board number.

Minimum matching requirements:

Parameter	Required
Brand	Skyworth / Sinotec-Skyworth variant as applicable
Model	65UB7500
Main board	5800-A9K25G-0P00
Board version	00.05 preferred
Region	Must match your market
Panel type	Must match installed panel
Firmware type	Full recovery/loader, not only OTA patch

Step 3 — Obtain the correct recovery firmware

Ask Skyworth or an authorized service center for:

• Full USB recovery firmware
• For 65UB7500
• For 5800-A9K25G-0P00 Version 00.05
• Matched to your serial number and region

Use wording like this:

“After installing incorrect firmware, the TV boots but all source inputs disappeared. I need the full recovery/loader firmware or correct option/NVM data for Skyworth 65UB7500, main board 5800-A9K25G-0P00 V00.05, matched to this serial number.”

Do not ask only for “latest firmware.” Ask for the recovery firmware or loader package.

Step 4 — Reflash correctly

Typical Skyworth USB procedure, based on publicly shown UB7500-family instructions:

1. Use an 8 GB or 16 GB USB flash drive.
2. Format it as FAT32.
3. Copy the correct firmware file to the root directory of the USB drive.
4. Do not rename the file unless Skyworth instructions require it.
5. Unplug the TV from AC power.
6. Insert USB into the TV’s USB 2.0/service-compatible port.
7. Plug the TV back in.
8. Power on using the physical button or remote, depending on the provided instructions.
9. Wait for the progress bar or LED flashing.
10. Do not interrupt power.
11. After reboot, perform a factory reset.
12. Check whether HDMI/AV/TV sources return.

A public Skyworth 55UB7500 guide describes the FAT32 USB/root-directory method and says the update can take around 15 minutes, but again, that guide is for a different screen size and should be used only as a procedural reference, not as the correct firmware source for your 65-inch unit. (skyworthphilippines.com)

Step 5 — Check factory/service menu options

If correct firmware is installed but inputs are still missing, then the option table may still be wrong.

Common Skyworth service-menu entry:

• Turn TV on.
• Press Source.
• Quickly enter 3 1 9 5.

This method is listed in Skyworth service-menu references, but availability depends on firmware and remote type. (factory-reset.com)

Inside the service menu, look for items such as:

• Project ID
• Model ID
• Design Menu
• Option
• Factory Option
• Source Config
• Input Enable
• HDMI Enable
• AV Enable
• Panel Type
• Region
• Tuner Type

Important precautions:

• Photograph every page before changing anything.
• Do not change panel type unless you know the exact panel code.
• Do not run ADC, white balance, reset NVM, or aging mode unless necessary.
• Do not alter LVDS/V-by-One/panel parameters blindly; a wrong panel setting can cause no picture.

If you find input flags set to “off,” “0,” or “not used,” re-enable them only if you are confident. Then save, power off, unplug for 60 seconds, and restart.

Step 6 — EEPROM/NVM/eMMC recovery if needed

If the service menu does not contain the correct model/project option or does not save changes, the low-level memory may need reprogramming.

Possible repair methods:

Method	Difficulty	Notes
Correct USB recovery firmware	Medium	Best first repair
Service-menu Project ID correction	Medium/high	Requires known-good values
EEPROM/NVM dump rewrite	High	Needs programmer and correct dump
eMMC replacement/reprogramming	Very high	Requires BGA/eMMC tools or preprogrammed part
Main board replacement	Medium	Must match 65UB7500 and panel

If replacing the board, do not buy only by board number. Confirm:

• 65UB7500 donor model
• Same board version
• Same panel type if possible
• Same region/firmware family

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Possible disclaimers or additional notes

• I would not assume the audio issue was solved correctly by the firmware flash. It may have been masked by the wrong software configuration.
• Do not install 55UB7500 firmware on a 65UB7500 unless Skyworth confirms compatibility for your serial number.
• Do not perform repeated random flashes; each wrong flash increases the chance of corrupting NVM/eMMC data.
• If the TV still boots, you are in a recoverable state. Avoid actions that could brick it, such as interrupting USB updates or selecting unknown service-menu reset options.

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Brief summary

The missing HDMI/AV sources are almost certainly caused by wrong firmware, wrong Project ID, or corrupted factory option data after the software installation. A factory reset cannot normally repair that layer. Your next step should be to obtain the exact full recovery firmware or option/NVM data for Skyworth 65UB7500 with main board 5800-A9K25G-0P00 V00.05, then reflash via USB. If that does not restore the inputs, use the service menu cautiously to correct the Project ID/input flags, or rewrite the EEPROM/NVM with a known-good dump from the same model.

5800-A9K25G-0P00

SOURCE / INPUT + 3195

MENU + 1147

65UB7500
Middle East / ME / GCC / KSA / SA

Model: Skyworth 65UB7500
Region: Middle East / Saudi Arabia
Main board: 5800-A9K25G-0P00
Board version: [print from PCB]
Panel code: [sticker on LCD panel]
Serial number: [rear label]
Current software version: [Settings > Device Preferences > About]
Fault: inputs missing / wrong firmware flashed
Required: USB recovery firmware or NVM/EEPROM option data

Need correct USB recovery firmware or NVM/EEPROM option data for:
Skyworth 65UB7500
Region: Middle East / Saudi Arabia / GCC
Main board: 5800-A9K25G-0P00
Board version: [write version]
Panel code: [write panel code]
Serial number: [write serial number]
Problem:
Wrong firmware was installed and now HDMI/AV/TV input sources are missing.
Please provide the correct Saudi/Middle East firmware package or NVM option file.

أحتاج سوفت وير USB أو ملف NVM/EEPROM الصحيح لشاشة:
Skyworth 65UB7500
المنطقة: الشرق الأوسط / السعودية / الخليج
رقم البورد: 5800-A9K25G-0P00
رقم البانل: [اكتب رقم البانل]
السيريال: [اكتب السيريال]
المشكلة:
تم تحميل سوفت وير غير صحيح واختفت مداخل HDMI / AV / TV.
أحتاج النسخة الصحيحة للسعودية أو الشرق الأوسط.

upgrade_loader_common_user_SW3_sa_20200911.pkg

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.