There are two types of NVRAM+RTC solutions for Philips CD-i players to store user data and settings: 8 KB and 32 KB. They have a built-in battery that powers the non-volatile memory and the real-time clock. These two types are not compatible and thus cannot be replaced with each other (at least, not without hardware and/or ROM modifications).
In this article, you’ll find information about the different NVRAM types and their alternatives. You’ll also find tips for repair and upgrades. If this looks familiar to you then you have probably read parts of it in my Modifications for Philips CD-i Players article before. Since the NVRAM section grew so large, I’ve completely rewritten it and will continue to update it in its own article.
Replacing blown fuses in Philips CD-i players with Mono III and Mono IV mainboards – sounds too simple to write an article about. That’s why I’m going to dig a bit deeper into the topic. An important fuse sits on the mainboard and protects the -5 V rail. I tripped (over) it by accident and was confronted with these weird symptoms that are hard to diagnose:
No video output (well, there is something, but see below)
Service Shell video output with a rolling/flickering image
The disc tray opens on its own (tray loader motor is constantly spinning)
In this article, I’ll upgrade a Philips CDI450 with 32 KB NVRAM. You’ll find all information that is needed to modify the system ROM and the mainboard. If this sounds familiar – yes, it does: In 2019, I explored the possibility to upgrade a CDI470. Even though patching the system ROM failed back then, the experiment was still a success. The final solution to access 32 KB NVRAM was to use the ROM of a 490. As it turned out later, this was also Philips’ solution for the 470/85 model, but that is a topic for another article.
With the 450 (and all other top-loading players with Roboco mainboard) it is a bit different: It’s a low-cost model with 8 KB NVRAM only. The mainboard was neither prepared for a bigger NVRAM solution nor is there a similar advanced model that I could borrow the system ROM from. This time, a ROM patch must succeed.
This guide shows the replacement of the laser sledge in Philips CDM 12.1T CD mechanisms. It assumes that you have already cleaned the lens and done the necessary troubleshooting to rule out other errors (see this article for diagnosis with the Service Shell). If you only get dirty disc messages or experience stuttering audio/video from time to time, you can still follow the guide to clean and grease the mechanism.
For documentation, I replaced the laser sleds of two CDI450 players with unreliable or no disc recognition at all. I took different approaches to find the easiest replacement procedure, so don’t be surprised if you suddenly see pictures where things are in different places.
This is an overview of the lists of capacitors and other components that I had to create in order to repair or modify my devices. Currently, all of them are already featured in my repair articles, but I will add further lists that are not featured yet or are a work in progress.
Recently, I acquired yet another CD-i player for repair and it came with a Philips 22ER9021 CD-i Gamepad. The gamepad showed two common signs of usage: Broken cable insulation and an unresponsive D-Pad.
The coating is broken right behind the cable strain relief. I’ve seen much worse cases of broken insulation and even ripped out conductors, but this still needs to be fixed before it becomes worse.
For quite some time, I was puzzled why my CDI660 was stuck in a reset loop after I inserted the test/dummy plug into Input 1. I expected it to boot into the Service Shell, like most other CD-i players. My solution so far was to use a 490 system ROM in the 660 whenever I needed the Service Shell (the compatibility and also the error were discovered during this experiment). However, this wasn’t a very practical approach because I had to open up the player and dig out the system ROM from underneath the DVC every time.
When CD-i Emulator with -testplug option showed the same behaviour, CD-i Fan figured out what is causing this error: The Service Shell module sv is missing from the 660/670 system ROM. In this article, I will show you a simple ROM patch to enable the Service Shell for the CDI660.
The second generation professional and authoring CD-i players of the Philips CDI60x series feature a DE-9 RGB port. To improve the video quality of my CDI605T/20 and also to prepare for future experiments, I built a prototype RGB SCART adapter. The needed pinout is documented in the 605 and 605Tuser manuals on ICDIA.
After the first tests were successful, I made this schematic for an adapter with a SCART socket (output) for both RGB video and audio:
It has been on my table for a while to figure out a working Philips CDI490 RGB SCART modification. The topic caught my interest when it came up in the community on The world of CD-i last year. Back then, I thought it would be quite easy because the small 470 and 490 CD-i players share a certain mainboard (Mono IV) with their big brothers 660/00, 220/80 and 210/60. There are only some components missing that could be figured out by looking at the service manuals.
However, I couldn’t try it out back then because I didn’t have a working 470 or 490. I focused on repairing my 470 first and then adding a PAL/NTSC switch. Eventually, I bought the needed components and two broken 490s to experiment with.
In 2014, I bought two top-loading CD-i players, the Philips CDI550 and CDI450. While the Magnavox CDI550 pops up every now and then in the U.S., the Philips CDI550 is quite rare in Europe and I’ve only seen a single one in all these years.