Discover COF NT39565H-C5253A test points and essential data
When working with theV420DK1-XRS1 COF Data Test Points and its COF NT39565H-C5253A, having full access to its data is crucial for accurate troubleshooting. This article breaks down all COF test points along with precise voltage readings. At the end, you can download the full COF images in 4K resolution via a PDF link, giving you a complete reference for easy fault detection. Whether you’re a professional technician or a hobbyist, this guide makes identifying and solving issues faster and simpler.
| Pin # | Signal / Function | Description | Test Point / Note |
|---|---|---|---|
| 1 | VGH | This voltage is used to keep the TFT gate drive in a high state, in simple terms, these voltages turn on the gate drive. | Expected: +27V |
| 2 | VGL | These voltages are used to keep the TFT in a low state, meaning these negative voltages turn off the TFT. | Expected: -7.8V |
| 3 | VDD | This power supply operates the logic circuit for the source COF and also for the internal panel. | Typical: +3.3V |
| 4 | GND | This is ground. It works everywhere in the panel’s internal circuit, including the scalar strip. | ~0V |
| 5 | STV | The function of the STV is that it generates clock pulses, which is where the scanning process begins. | 0.04V |
| 6 | CKV | CKV is a clock signal that causes the gate drive to shift the line, which is why double image faults are seen in some panels. | +1.71V |
| 7 | OE2 | OE2 This signal enables and controls the output of display data. | +1.36V |
| 8 | OE1 | OE1 This controls the secondary signal output. | +1.36V |
| U | UD | UD Its function is to control up-down scanning and it also identifies the direction of vertical scanning. | 3.3V |
| L | LR | Its function is to control the left-right horizontal shaft. | +3.3V |
| R | STVR | The STVR starts the backup line and this is the secondary start pulse signal. | 0.06V |
| V | V-COM | Common voltage flicker and screen black level setting | +7.3V |
| NC | NC |
Note: The above COF data is tested on real panels and voltage values may vary slightly depending on the panel model.
Conclusion
Reviewing the complete COF NT39565H-C5253A data and test points for the V420DK1-XRS1 panel ensures accurate fault detection and avoids common mistakes. Don’t forget to download the full COF images in 4K via the PDF link at the end of the article for a complete reference. Using this information as a guide will make repairs more efficient, reliable, and safe for the panel.
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FAQ section
1Q: What is COF NT39565H-C5253A?
A: COF NT39565H-C5253A is the chip-on-flex component used in the V420DK1-XRS1 panel. It controls the display signals and is essential for proper image rendering. The article provides full data and test points.
2.Q: How can I check the voltage on COF test points?
A: You can measure voltage on each test point listed in the article using a multimeter. Follow the table in the article for exact voltage values and reference.
3.Q:Can I download the full COF images?
A:Yes, at the end of the article there is a PDF link to download the full COF images in 4K resolution for reference and fault detection.
4.Q: What faults can be detected using this COF data?
A:By using the COF data and voltage readings, technicians can identify common display faults, blank screens, or signal inconsistencies in the V420DK1-XRS1 panel.
Shaukat Ali has over 30 years of experience in LED TV repair, specializing in chip-level repair work. He is an expert in Sony LED TVs, and also repairs other major brands like Samsung, TCL, Orient, and Haier. His expertise includes display panel faults, motherboard issues, power supply circuits, T-Con, and HDMI faults. Based in Lahore, he shares real-time fault finding cases from daily repair work to help technicians and learners with practical experience.
📞 Contact: +92 321 4066054