The ILI5271M2AA1 gate COF is utilized in the Innolux V400HJ6-PE1 40-inch LED TV display panel. This specific panel is commonly found in various TV brands, including Sansui, Walton (Wsd40fd), Starshine, Panasonic, and several others. The panel architecture consists of eight source COFs and a total of four ILI5271M2AA1 model gate COFs.
When is it unnecessary to check the voltage of the ILI5271M2AA1 gate COF test points? If you encounter a black screen issue where light dispersion is visible upon finger stroking, it is recommended to first check the VGH, VGL, and AVDD voltages on the ML1 94V-0 E253117 TCON board. If these voltages are absent, inspect the power management IC (DC-to-DC converter) circuit to see if any diodes are shorted or open, or if any filter capacitors are faulty. In many cases, most V400HJ6-PE1 panels can be repaired by addressing these power issues without needing to check the ILI5271M2AA1 gate COF voltages directly.
Now, let's determine when you must check the ILI5271M2AA1 gate COF voltages. The V400HJ6-PE1 display utilizes four ILI5271M2AA1 gate COFs. If you notice half-screen or quarter-screen issues, it is certain that the gate COF responsible for driving that specific section is missing the necessary voltage or signal. Furthermore, if you encounter problems such as flickering, horizontal lines or bars, vertical lines or bars, or a "no display" condition, you must check the test points on the ILI5271M2AA1 gate COF and bypass the missing voltage or signal lines from the ML1 94V-0 E253117 TCON board. The serial numbers, pinout, and accurate voltage levels for the ILI5271M2AA1 gate COF test points are provided in the table below.
ILI5271M2AA1 Gate COF Datasheet
The pinout, signal identification, and voltage details for the ILI5271M2AA1 Gate COF are provided in the table below. Please refer to the corresponding diagram of the gate COF to cross-reference the test points, and verify the voltages carefully to ensure accurate repair.
Figure: ILI5271M2AA1 gate COF Datasheet
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Voltage test points and connection tracks of ILI5271M2AA1 gate COF. |
| Serial No | Test Point Name | Voltage / Value |
|---|---|---|
| 1 | VGL | -8V |
| 2 | VGL | -8V |
| 3 | VDD | 3.3V |
| 4 | VCOM (Common) | 7.3V |
| 5 | VGH | 30V |
| 6 | VGL | |
| 7 | VGL OUT | Same as VGL |
| 8 | VGL OUT | Same as VGL |
| 9 | VG OUT | Same as VGH |
| 10 | VDD | 3.3V |
| 11 | 7.3V |
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