TDA2658 IC Replaced in Philips Color Monitor
More than two months ago I ordered a TV transmitter from China (the PAT 550) so I could watch television in my other rooms were I had no reception. After all those years not been able to. And when it gets cold in wintertime it is nice to be able to watch television from a warm bed without having to stand up. (I only use central heating in my Living room, so my Bedrooms stay very cold in winter. And I do not want to waste energy in these very bad isolated Rooms).
I used to have a four channel adjustable 2.4GHz Transmitter but it had so much interference from 2.4GHz Internet Routers in my apartment now that I was unable to watch the TV signal without fierce Router disturbances .
With the new Transmitter I am now also perfectly able to switch the channels with my IR transmitter. Because the Transmitter supports 2 channels at the same time. One channel at 5.8GHz for transmitting the perfect HD Video signal to my bedroom(s). And another channel at 433 Mhz for the IR control signal back to the receiver. And it really works superb! And the Video quality is so much better than I first expected. Just as the great working IR control.
Only drawback is that the Transmitter with one supporting receiver only supports Scart Input and Output signals. Which is no problem with any older TV or Monitor and my Dreambox Satellite receiver that also still supports one Scart Output port and also one HDMi Output connection.
Because I had some older Color Commodore 64/128 Monitors that also have Scart input I used one to test my new TV Transmitter. But while receiving the signal on a CM8833 Philips Monitor it broke down. The internal Vertical TDA2658 deflection IC had given up while locking on to the very high quality signal. And my Monitor only gave a bright horizontal white line on screen after that. After opening the Monitor I couldn’t find any other problem than the Vertical deflection IC itself.
So I ordered on 27 July five of them for only about 4 US Dollar free Shipping. And today at 19 September 2016 they finally arrived after almost 2 months of waiting. And this article is about repairing the defect CM8833 Philips Color Monitor (with green screen button for Word Processing when needed). Below the now from the Monitor Board removed defective Vertical Deflection IC.
On previous photos it shows that removing the Mainboard out of the Monitor Housing, after all
Connectors and a couple of Ground wires are removed, is easily done.
And both Component top and Bottom Solder sides of this IC302 are shown before soldering the new
Above Photos show the new replacement TDA2658 I received after almost 2 months of waiting. Just
before soldering it into the Board. Because of the white (Cooling Paste?) it looks kind of if they are
already used before. And that was why I was afraid that it would not going to work. But as it turned
out, the Chip was okay and maybe removed out of an old Board but still working great!
Before I could remove the old TDA2658 and replace it by a new IC, I had to partly remove the Metal
Bottom Shield Plate. And resolder it back to the Mainboard as can be seen on the Photo below.
Next Photo shows the Scart Back panel with the temporary from the tube removed CRT
And the Photos following show the result. Only one component replaced, at almost no cost as often
is the case, and a completely like new working Monitor again!
It is funny that these old CRT color Monitors still are of use in these era of HDMi connected signals and High Definition Television days. Who would ever have thought that it would go so fast. A well known expression is “seeing is believing” while looking back on another successful repair.
And knowing that there were millions of Commodore 64 and maybe also Amiga Computers made , they still all work perfectly on these “ancient” CRT Monitors. That is also the reason why the CM8833, this repair was about, has an integrated Sound Amplifier. The SID Chip in the C64/128 and the Amiga Music Chip composed great Music (MOD files). Long before MP3 was the widely accepted File Format. Until another repair.
Albert van Bemmelen, Weert, The Netherlands
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Note: You can read his previous repair article in the below link: