How to Fix Provision DVP007T02 DVD/CD Player
One of the nice things we can enjoy at home is watching television on the almost free FTA DVB-T2 channels. I say almost free because we still need to buy and install an outside placed special DVB-T2 antenna and buy a small DVB-T2 receiver. Most of the DVB-T2 signals are scrambled but the Dutch NPO1,2,3 and NPO1 Extra channels with L1, and Omroep Brabant can be received in the Netherlands 24/7 completely free. And for my city I just have to direct the DVB-T2 antenna into the direction of the local television station at Roermond.
My DVB-T2 receiver is a perfectly working Cabletech HEVC H.265 receiver. And it also can record any tv program onto a inserted usb memory stick pre-programmed over EPG. But for TV recording I mostly just use my Dreambox DM800HDse satellite receiver with 1TB ssd harddisk because it receives all commercial channels, and only those show a lot of movies.
The outside placed antenna also amplifies the RF TV signals and is fed over the 5V dc from the coax cable connection to the DVB-T2 signal input of the receiver. There is no other way to receive those FTA signals inside our home because our modern double glazed windows block any DVB-T2 signal. This is due to the wafer-thin metal oxide coating (the so-called Low-E or high-efficiency coating) that is applied to the glass to keep heat inside or to reflect sunlight. Here a photo of my DVB-T2 antenna mounted on an old 27MC mast on my balcony.
Although our windows do not always completely block radio waves, in many cases they ensure extremely high attenuation (signal loss ranging from -24 dB to as much as -54 dB). This creates an effect similar to a Faraday cage, which can lead to intermittent Wi-Fi, dropped phone calls, or a complete lack of 4G/5G coverage indoors. And any high RF frequency above about 700 MHz gets completely blocked. It however luckily does not block my phone connection to any of the nearby base transceiver stations. Probably because the signal strength is higher and a lot more power is used to transmit these. Although this likely still would be a real problem if my windows were HR++ or triple glass made. When however in today’s world the power to the base transceiver stations is interrupted we no longer can contact emergency services, the hospital or our doctor! Which about thirty years ago never was a problem because our telephone companies always had their own local powered backup batteries. In today’s world everything can easily be hacked or disturbed!
But now we get to the point that this repair is all about. I viewed the FTA DVB-T2 tv programs on a small 20 year old Provision DVD player model DVPT007T02. But it suddenly started fading the screen view until it was just completely dark and black with only the stereo sound still working. The video signal coming out the scart output of my Cabletech DVB-T2 was not the culprit here because that still worked perfectly when viewed on my old 7 inch AEG CTV 4961 DVB-T/USB/CR receiver that no longer works with the new DVB-T2 transmissions.
Luckily on my Provision DVD movie playback and playing CD audio still worked perfectly. But somehow now only viewing the composite video input no longer worked. Searching for service manuals or schematics sadly failed completely also because apparently these Provision devices were manufactured in great quantities in eastern factories and their schematics shielded from sharing any information. All I knew was that the player switches from DVD/CD playback to viewing the Video input signal by pressing the AV-IN button on the small 3V lithium fed IR remote. And that still worked fine.
Above photo shows the mainboard after we removed the 8 screws to open the bottom of the case. And notice here below in the photo the 4 pin connector plug with the black, red, and thick black shield wire, plus white wire. After examining I found that the black wire was the Video input wire. It was directly connected to the input connector.
And that cable goes in the thick grey cable to another board in the top below the LCD panel of the Provision player. Here a photo of the label on the bottom of this player.
Below photo shows the component side of the mainboard of this Provision player.
Finding the datasheet of the MT1389QE chip was no problem but examining this large chip gave no solving answers. This chip apparently also is used in a LG DVD player of which I found its complete LGDVT418 service manual. Because the videosignal continued its traject through the grey 4 wire cable into the top of the player I also started to open the top of the case with the LCD panel by removing the 6 silicone/rubbery inserts that hid the 6 tiny screws.
Clearly we here can see the 4 wire grey cable with the black video input wire that goes to this board under the LCD screen in the top of the Provision player. And also the CFL backlight inverter and the two small audio speakers for left and right (stereo) audio are visible. And another large chip marked T100A FK6474.1. Of which no datasheet could be found why I started asking Google’s AI for any available info.
Google gave following info:
The Terawins T100A is an integrated circuit (IC) that functions as an LCD video display controller/driver chip. The additional code on the package (FK6474.1) is a manufacturerspecific batch, lot, or production code and does not affect the general technical specifications of the chip itself.
As the official standalone datasheet from Terawins is not widely available for public download, these specifications are based on the official Terawins product selection guide:
Function: TFT Display Controller IC Package: LQFP-100 (Low-profile Quad Flat Package) or QFP Analog-to-Digital Converter (ADC): 9-bit
Channels: 2 or 3 channels (depending on the specific configuration mode)
Operating Temperature: Extended range from -40°C to 105°C
Applications: Processing and driving video signals for smaller TFT/LCD screens (such as invehicle monitor systems, portable DVD players, or industrial displays).
On this T100A board are 2 small smd capacitors that connect the black video signal wire to pins 12 and 16 of the T100A chip. And the only other chip on this board was a 8 pins JRC NJM3414 opamp. This chip likely caused a strange measurement of 1.4mF and 75,44 ohm when I measured C7 in circuit with my Fnirsi LCR ST2 tweezer tester. Measured out of circuit C7 measured fine 587pF and a Rs of 10.23Mohm! And this Fnirsi tester is, of my 4 tweezer testers I have the best working tester for accurate in-circuit measurements!
C7 was going to pin 16 of the T100A chip and the other capacitor connected the video signal black wire to pin 12 of the T100A chip.
Conclusion of Google’s AI was to replace the T100A chip if the internal ADC circuit is defect now. Or replace the JRC 8 pin dual opamp because the second internal opamp may be used here for amplifying the video input signal before it goes to the T100A chip.
Following last photo shows a close-up of the grey 4 wire cable that goes from the bottom mainboard to the LCD top panel.
Because I certainly was not going to replace a possibly defect T100A chip in this now 20 year old device and I had no JRC opamp at hand I decided to end my repair here for now. Not to risk more defects afterwards also because now my Provision player still works perfectly as stand -alone DVD movie and CD audio player!
But not after again asking the AI if it still could gather more info on the T100A chip that may be partly defect here. Also because it is close to impossible to extract any specific info from the Chinese websites where a phone inlog prohibits any European registry. Google’s AI agreed, and it then said this:
Terawins T100A – Critical Pin-out (LQFP-100)
The T100A is designed so that the analog video inputs are grouped on one specific side of the 100-pin chip.
These are the exact pin functions around the pins you examined:
Pin 11 (VREGO): Output for the internal voltage regulator (often connected to a decoupling capacitor to ground).
Pin 12 (VCOIN): The input for the internal Phase-Locked Loop (PLL) and the Sync Separator. This explains exactly why that brown capacitor ran from your video signal to here! The chip uses this to filter the horizontal and vertical synchronization from the video signal.
Pin 13 (REFI): Reference current input (usually connected to a precise resistor to ground to calibrate the internal ADC). Pin 14 (VAGC): Automatic Gain Control (automatic volume control for the video signal, coupled with a small capacitor).
Pin 15 (VINX): Additional analog video input (often unused/grounded in basic designs).
Pin 16 (VINY / CVBS1): The primary Composite Video input (CVBS) or the Y-signal (Luminance). This is the pin where your C7 capacitor and the JRC op-amp send the image.
Pin 17 (VINC / CVBS2): Secondary video input (used for S-Video Chrominance, or in this type of DVD player often the switchable input for the external AV IN).
Pin 18 (AVDD_ADC): The analog power supply voltage (+3.3V) specific to the video converter section.
Pin 19 (AVSS_ADC): The analog ground for the video converter section.
Why this helps with your Provision board:
With this overview, you can see that Pin 16 and Pin 17 are the two video inputs. It is quite possible that the internal DVD signal enters on Pin 16, and the external video signal is sent from your 4-pin plug via the JRC opamp to Pin 17. If you ever decide to open the player again, you now know exactly which pins of the large chip to measure to see if a video signal is arriving at all.
Conclusion: This article no doubt will help other owners of this Provision DVD/CD player to examine their player in case a search for a desperately needed service manual also failed.
And when I in the near future still decide to take my player apart again when I still want to check if replacing the dual JRC opamp will solve the present not working video input issue, I certainly will now have much less problems to quickly do so. And I’ll just keep the Provision player still working as stand-alone DVD/CD player.
And now I just use my 7 inch AEG CTV 4961 DVB-T/USB/CR receiver for viewing the available FTA DVB-T2 channels.
This through Conrad bought AEG player used to work in the past with previous DVB-T transmissions, but its internal lithium battery never functioned from day one after it was received. And therefore I soon after removed this battery for safety reasons. And it now simply works on the 9V 1,5A adapter that was originally provided with this 7 inch player.
Albert van Bemmelen, Weert, The Netherlands.
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Note: You can read his previous article on BR-6 Geiger – Muller Meter Repair
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