JVC AV-27820
JVC AV-27820 CRT RGB mod
The JVC AV-27820 is a 27" flat-screen CRT television from the early 2000s, often praised by enthusiasts for its solid picture quality, S-video input, component YPbPr input, and 550 lines of horizontal resolution. It features a dark-tinted screen, MTS stereo with dbx, and supports "Game Mode," making it popular for retro gaming, with potential for further picture enhancement via RGB mods.
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Contributors
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CRT safety
Caution
You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.
Plan of attack
Manuals and Datasheets
Specs
- Year: 2001
- Format: NTSC
- Chassis: FA
- Tube: JVC A68ADT25X01
- Jungle Chip: Toshiba TA1242N
- OSD Chip: M37267M8-213SP
- Screen Size: 20"
- Inputs: Composite, S-Video, RF, Component YPbPr
RGB mux diagram
Performing the mod
Anything above 1.5V on blanking input (PIN 14 on Jungle) will enable the analog RGB input.
This mod uses the RGB mux board. This is optional, but will make your mod easier and stable. You can also create the circuit presented in the schematics above without the board. Please also checkout the mux calculator to play with your own values.
| Component | Value |
|---|---|
| RGB/OSD inline resistor (chassis) | 3.3kΩ |
| Removed RGB/OSD resistor (chassis) | 1.2kΩ |
| RGB inline diode method (chassis) | Yes |
| 0.1μF caps replaced (chassis) | Yes |
| RGB termination (R1, R2, R3) | 220Ω |
| RGB inline (R4, R5, R6) | 1kΩ |
| Audio LR (R7, R8) | 1kΩ |
| Diode (R9) | 1N4148 |
| Blanking Ground Resistor (R10) | open |
| Blanking Resistor (R11) | 1kΩ |
Pictures
Reference Photos