CX400DLEDM 40-Inch LED TV Panel and Backlight Identifier

User question

CX400DLEDM

Artificial Intelligence Response

Direct answer to the question

CX400DLEDM is most likely a 40-inch LCD/LED TV panel/backlight assembly identifier, not a discrete electronic IC. It appears in TV service and spare-part listings as an LCD panel used in several rebranded/OEM 40-inch televisions, including AKAI, BBK/DEXP-type chassis, and similar models. Service listings commonly associate it with LED backlight strips marked CXD400410000-X3 / ZDCX40D10-ZC14F-02 / 303CX400033 and, in some cases, the V400HJ6-PE1 40-inch Full HD LCD open-cell/panel family. (kenotrontv.ru)

Key identifiers you may need:

Item	Commonly associated value
Panel / matrix marking	CX400DLEDM
Screen size	40 inch
Resolution, where cross-referenced with V400HJ6-PE1	1920 × 1080 Full HD
LCD interface, V400HJ6-PE1 reference	2-channel LVDS
Typical panel supply, V400HJ6-PE1 reference	12 V nominal
Backlight strip references	CXD400410000-X3, ZDCX40D10-ZC14F-02, 303CX400033
Typical backlight strip data from parts listings	4 strips, 10 LEDs per strip, 3 V LEDs, about 785–786 mm length
Example mainboards seen with this panel	P75-3663SV6.3, CV628H-T42

Detailed problem analysis

If you are identifying or repairing a TV marked CX400DLEDM, treat the marking primarily as a panel/backlight compatibility code. It is not enough by itself to guarantee interchangeability of every part; you should also verify the TV model, mainboard, LCD panel label, backlight strip marking, connector style, LED count, and LED voltage.

Several service references list CX400DLEDM as the LCD panel in TV sets using mainboards such as P75-3663SV6.3 and CV628H-T42. One AKAI UA40LEP1T2 service listing pairs P75-3663SV6.3 with LCD Panel: CX400DLEDM, while a BBK 40LEX-5938/FT2C listing shows Panel: CX400DLEDM, LED backlight: CXD400410000-X3, and an integrated LED driver using BIT3267 with an AOD4454 MOSFET. (kenotrontv.ru)

A commonly cross-referenced LCD open-cell is InnoLux V400HJ6-PE1. Its datasheet describes it as a 40-inch TFT LCD TV product, 1920 × 1080 Full HDTV, 16.7 million colors, with a 2-channel LVDS interface, and notes that the backlight unit is not built in. This is important because the LCD glass/open-cell and the LED backlight assembly are related but not the same part. (fortec-integrated.de)

For the V400HJ6-PE1 reference, the LCD electronics use a 12 V nominal VCC rail, specified over 10.8–13.2 V, and the LVDS connector includes multiple +12 V power input pins. This is separate from the LED backlight drive voltage, which is much higher because multiple LEDs are connected in series. (fortec-integrated.de)

Current information and trends

Current spare-part listings show multiple compatible LED strip references for this panel family. One listing identifies a 40-inch LED bar set ZDCX40D10-ZC14F-02 / 303CX400033 as compatible with V400HJ6-PE1, CX400M03, CX400DLEDM, and CXD400410000-X3, with 10 LEDs, 3 V per LED, 785 mm length, and 1 set = 4 pieces. Another listing gives similar data for a new backlight set and states 786 mm, 10 LEDs, 3 V per diode, 2-pin connector, 40-inch screen, and aluminum substrate. (pulsarbg.com)

This means that if your goal is to buy backlights, the safest search terms are usually:

• CX400DLEDM LED backlight
• CXD400410000-X3 LED strip
• ZDCX40D10-ZC14F-02
• 303CX400033
• V400HJ6-PE1 backlight 40 inch 10LED 3V 785mm

However, do not order solely by the internet listing title. Some 40-inch TVs have visually similar but electrically different LED strips. Match the original strip code, LED count, length, connector position, and 3 V vs 6 V LED type before purchase.

Practical guidelines

If the symptom is “sound but no picture”

Most likely causes are:

1. Failed LED backlight strip
2. Open LED in one series string
3. Shorted LED
4. LED driver shutdown
5. Less commonly, mainboard backlight enable/PWM fault

Recommended tests:

1. Flashlight test

   • Turn the TV on.
   • Shine a strong flashlight at an angle onto the screen.
   • If you see a faint image, the LCD/T-Con/main video path is probably working and the fault is in the backlight system.

2. Measure LED driver output

   • Use caution: LED outputs can reach tens to over 100 V DC.
   • If the LED voltage rises briefly and then collapses, the driver is usually detecting an open or abnormal LED load.
   • If there is no LED output at all, check LED enable, PWM dimming, driver IC supply, MOSFET, current-sense resistors, and boost converter components.

3. Test the LED strips

   • Use a proper constant-current LED backlight tester.
   • Disconnect the LED connector from the board before testing.
   • Test the full string first, then individual strips if the full string fails.

If you are replacing the strips

Best practice:

• Replace the complete set, not just one LED or one strip.
• Clean the metal chassis before installing new aluminum-backed strips.
• Ensure good thermal contact.
• Reinstall diffuser sheets in the exact original order and orientation.
• After repair, reduce the TV Backlight setting to about 60–80% to reduce LED temperature and extend life.

If the fault is no power or boot loop

For boards such as P75-3663SV6.3 or CV628H-T42, check:

• Standby rail, usually 5 V or 3.3 V depending on design
• Main DC rail
• 12 V panel supply
• SPI/eMMC firmware condition
• Backlight enable signal
• PWM dimming signal
• Shorted DC/DC converters on the mainboard

Service posts for AKAI UA40LEP1T2 associate CX400DLEDM with P75-3663SV6.3 and SPI flash references such as EN25QH64, so firmware may also be relevant if the TV powers but does not boot correctly. (elektroda.com)

Possible disclaimers or additional notes

• CX400DLEDM is not necessarily the retail TV model. It is often a service-panel or matrix/backlight identifier.
• Backlight compatibility is not guaranteed by panel size alone. Verify the physical strip marking.
• The LCD panel and the backlight are separate assemblies. A V400HJ6-PE1-type open cell may require a specific external backlight unit because the datasheet states the backlight is not built into the open-cell product. (fortec-integrated.de)
• High voltage safety: LED driver outputs and primary power supply sections can be dangerous. Work with the set unplugged, discharge capacitors, and use an isolation transformer when appropriate.

Brief summary

CX400DLEDM identifies a 40-inch LED/LCD TV panel/backlight family used in various OEM/rebranded TVs. For repair work, the most relevant associated parts are usually CXD400410000-X3, ZDCX40D10-ZC14F-02, and 303CX400033 LED strips. Typical compatible strip sets are listed as 4 bars, 10 LEDs per bar, 3 V LEDs, about 785–786 mm long. If you are troubleshooting a black-screen TV with sound, start with the flashlight test and then test the LED backlight strings with a proper LED tester.

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.