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Grandstand TV Game 2000 Troubleshooting Guide

From RetroTechCollection
Grandstand Adman TV Game 2000 (6)
Component side of a TV Game 2000 board after a capacitor burst: the TMS1965NL game chip, the CD4071BE below it and fibrous debris across the board.

Symptom-by-symptom fault-finding for the Grandstand TV Game 2000, the Korean-made black-and-white Pong console built on the Gamatic 7600 board and a Texas Instruments TMS1965NL game chip.[1][2] No service manual or schematic exists for it as far as can be found, and the only fault report for a TV Game 2000 is the one published by the owner of the console in the photographs, whose console stopped working when an electrolytic capacitor burst.[3] The expected values below come from the console's leaflet and labels and from the TMS1965 pin table published by Facele. Opening the case, cleaning and care are on Grandstand TV Game 2000 General Maintenance.

What should happen at power-on

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With six good cells fitted or a 9 V adaptor connected, POWER switched on and an analogue television tuned to UHF channel 30:[4]

  • A black and white picture of the game chosen on the GAME SELECTOR appears: football, squash, tennis or practice.[5][6]
  • The score for each side is shown on the screen and counts from 0 to 15.[4]
  • With AUTO SERVE on, the ball is served by itself. With it off, play waits until the SERVE button on the left control box is pressed. RESET on the right control box clears the scores.[5][1]
  • Each BAT CONTROL knob moves its bat up and down the screen, and the speaker in the console sounds as the ball is hit.[4][6]

Expected measurements

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TV Game 2000 reference values
Point Expected Source
Six fresh C cells in series About 9 V [7]
Supply current About 40 mA (360 mW at 9 V on the base) [7][8]
TMS1965 pin 4 to pin 2 6 to 7 V [9]
TMS1965 pin 17 2 MHz clock [9]
RF output UHF channel 30, 75 Ω [4]

A current-limited bench supply set to 9 V with a limit of about 100 mA is the safest way to power a console that has not been checked. A reading far above 40 mA points to a short on the board.

Symptoms

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TV Game 2000 symptoms
Symptom Likely cause Action Source
Dead on cells and on the adaptor Flat or corroded cells; corroded springs; a failed POWER switch; a burst capacitor or a part damaged by one Measure the six cells in place. Check for 9 V through the POWER switch. Open the base and look for a burst or leaking electrolytic and for a resistor that has come loose. [3][10]
A crack or pop, then nothing; debris inside An electrolytic capacitor has burst Switch off and take the cells out. See Grandstand TV Game 2000 Capacitor Replacement Guide. [3][10]
Runs on the adaptor, not on cells The socket's switching contact no longer reconnects the cells; corroded springs or battery leads Plugging in the adaptor disconnects the cells, so the socket has a switch inside it. Check continuity from the cells to the board with no plug in. [4]
Runs on cells, not on the adaptor Wrong adaptor polarity or voltage; dirty socket The owner of the photographed console gives the socket as centre negative; the leaflet says only the Adman 2000 TVG adaptor should be used. Measure the adaptor before connecting it again. [3][4]
Snow on the television, no change when the console is switched on Television not on channel 30 or without an analogue tuner; broken RF lead; no supply to the modulator Tune by hand around channel 30. Check the lead and plug for continuity. [4][11]
Picture drifts, tears or will not hold Television fine tuning; the HORI-HOLD setting Fine-tune the set, then turn HORI-HOLD slowly through the rear hole. [12][3]
Steady blank screen from the console, but no playfield The TMS1965 is not running: no supply on pin 4 or no clock on pin 17 Measure pin 4 to pin 2 (6 to 7 V). Check pin 17 for a 2 MHz clock with an oscilloscope or frequency counter. [9]
One bat missing, jumping or stuck at one edge Dirty, worn or open BAT CONTROL potentiometer; broken conductor in the coiled lead Measure the potentiometer through its lead while flexing the lead. Clean or replace the potentiometer. [9][13]
Wrong game, or a setting that has no effect Dirty slide switch or game lever Each setting and game is a switch from a chip pin to ground in the published TMS1965 circuit. Clean and work the switch. [9]
Scores will not clear RESET button or its lead RESET is on the right control box; the TMS1965 reset input is pin 25. [5][9]
No sound, picture normal Speaker or its leads; the sound driver The speaker is wired to the board by flying leads. The published TMS1965 circuit drives the speaker from pin 3 through a transistor; the 2000's sound circuit has not been traced. [11][9]

Known faults reported for this device

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  • Burst electrolytic capacitor. The console photographed for Wikimedia Commons does not work. Its owner reports that a capacitor near the left side of the board exploded, scattered its contents through the case and knocked a resistor off its solder pads.[3] The failed part is a SAMHWA 470 µF 16 V electrolytic, and the resistor's body is charred so that its value cannot be read.[10] The owner does not say what caused the failure.

No other fault report for the TV Game 2000, or for the Gamatic 7600 under its other names, has been found: museum records and collectors' pages describe the console, but no repair thread for it has turned up.

Things that are not faults

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  • The picture is black and white. The box describes it as a "B/W video T.V. game".[6]
  • With AUTO SERVE off, nothing happens after a point until SERVE is pressed on the left control box.[5]
  • Scores run from 0 to 15 only.[4]
  • There are four games and no light gun. Facele lists six games for the TMS1965, including two shooting games, but the 2000's selector offers only football, squash, tennis and practice.[9][5]
  • Plugging in the adaptor cuts off the cells, as the leaflet says it should.[4]
  • A modern television with only a digital tuner shows nothing. The console needs an analogue UHF tuner on channel 30.[4]

What is realistically repairable

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Repairability of TV Game 2000 parts
Part Repairable? Notes
Electrolytic capacitors, resistors, the 9016 transistor Yes Ordinary through-hole parts on a single-sided board. Read each value from the old part before removing it. The resistor knocked off by the burst capacitor on the photographed console cannot be read, so its value has to come from another Gamatic 7600 board or from tracing the circuit.[2][10]
Slide switches, game lever, BAT CONTROL potentiometers, buttons Yes Clean first; replace a potentiometer only with the value measured on the original.
Coiled leads Yes The leads are soldered at both ends and clamped where they enter the case.[11]
Adaptor socket Yes Replace with a socket that has the same switching contact, so that the cells are still disconnected when a plug is in.[4]
KDC UM-1111E 30 modulator Partly A sealed can on a metal plate.[11] No replacement or composite-video modification has been published for the 2000. On another TMS1965 console, a Polistil, Facele fitted composite video and audio outputs using a CD4072, a BC547 transistor and a new 6.3 V supply built from a 7805 and two 1N4148 diodes.[14]
TMS1965NL Only by transplant Long out of production. Facele and the HomeComputerMuseum describe it as pin-compatible with General Instrument's AY-3-8500;[9][1] no report of fitting one in its place on a Gamatic 7600 board has been found. Rule out the supply, the clock and the switches before suspecting the chip.
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References

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  1. ↑ 1.0 1.1 1.2 HomeComputerMuseum (Helmond), "Gamatic 7600" (retrieved 2026-10-18): the Gamatic 7600 was "sold worldwide under many brands, as the Grandstand T.V. Game Model 2000 for example, or the Univox 41 N"; board labelled "F'GAMATIC-7600"; controllers with a dial and a red button each, serve on the left and reset on the right; ball speed, automatic serve, game, rebound angle and paddle size switches; six CM2 cells or an external 9 V DC supply, 360 mW; TMS-1965 chip.
  2. ↑ 2.0 2.1 Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (6).jpg (CC BY 4.0, from Wikimedia Commons), and the larger copy of the same view on the owner's blog, examined at full size: component side of the board with "TMS1965NL KA 7740" (Texas Instruments logo), "CD4071BE RCA 707", a transistor marked 9016, a black trimmer at the board edge, a metal can, a large lavender electrolytic of which only "85°C" can be read, three white and two small lavender electrolytics whose values cannot be read, and fibrous debris over the board.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 José Antonio Ortigueira Amor, "Adman Grandstand TV Game 2000 (WK-I HB) (1977)", Retro Ordenadores Orty (collector's blog, in Spanish), 7 November 2023 (retrieved 2026-10-18). The owner's description of his console: Texas Instruments TMS1965NL and RCA CD4071BE on the board; control boxes permanently wired, their leads leaving the left and right sides of the case, SERVE on the left box and RESET on the right; rear socket "AC 9V ADAPTOR" for an external 9 V DC supply, centre negative; a rear "HORI-HOLD" control for adjusting the displacement of the picture; RF lead for UHF channel 30; six 1.5 V LR14 cells in an internal compartment reached through the lower case, with the serial-number label inside it; four screws hold the lower case, and removing it exposes the back of the board, marked GAMATIC-7600 and WK-I HB. The console does not work: a capacitor near the left side of the board, to the left of the other capacitor, exploded, scattered its contents through the inside of the console (hard to clean, and some remains on the board) and knocked a resistor off its solder pads.
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 Adman, TV Game Model 2000 instruction leaflet, pages 2 and 3, as photographed by José Antonio Ortigueira Amor and published (CC BY 4.0) on Retro Ordenadores Orty, 7 November 2023 (retrieved 2026-10-18). Figure 1 (top, rear and bottom views) with fifteen numbered parts, among them 2 manual serve button, 9 reset button, 10 control box, 11 bat control, 12 speaker, 13 "9V ADAPTOR JACK", 14 "HORI LOCK" and 15 battery cover; the bottom view shows four fixings at the corners. Features: score shown on the screen from 0 to 15; "Dual power system: 6 x 1.5V UM cell or external 9V AC adaptor"; "Video signal supplied through 75 ohm coaxial cable". Warning: use only the Adman 2000 TVG adaptor, because "failure to use this approved adaptor may cause damage to your set". Operating procedure: open the battery cover on the bottom cabinet and insert six UM 1.5 V cells; the adaptor plug goes into jack 13, and "this connection of the adaptor disconnects internal battery supply"; the game "is designed for use on channel 30".
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (3).jpg (CC BY 4.0, from Wikimedia Commons): the control panel (POWER ON/OFF, SPEED FAST/SLOW, AUTO SERVE ON/OFF, GAME SELECTOR lever for FOOTBALL, SQUASH, TENNIS and PRACTICE, ANGLE 20°/40°, BAT SIZE LARGE/SMALL) and the two control boxes, each with a BAT CONTROL knob and a red button labelled SERVE on the left box and RESET on the right.
  6. ↑ 6.0 6.1 6.2 Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (2).jpg (CC BY 4.0, from Wikimedia Commons): the console in front of its box, printed "Adman MODEL 2000 GRANDSTAND T.V. GAME" with a roundel "B/W VIDEO T.V. GAME" and the text "Plays on any make, any size T.V. (625 Lines UHF)", "Realistic Sound Effects", "Variable Speed. Variable Angle. Variable Player Size.", "Automatic On-Screen Digital Scoring and Manual/Automatic Service" and "Integral or Remote Player Controls".
  7. ↑ 7.0 7.1 Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (8).jpg (CC BY 4.0, from Wikimedia Commons), examined at full size: the base, with the battery cover and its two tabs marked OPEN, the label "ADMAN GRANDSTAND / TV GAME 2000 / POWER SUPPLY: 9V-DC (6xUM-2 BATTERY) OR AC ADAPTER 9V / MADE IN KOREA", the moulding "POWER CONSUMPTION 360mWATT, 9V DC", and a rubber foot at each corner with a screw recessed inside it.
  8. ↑ Game Tech Wiki, "INTEL (INTerELektronik GmbH)", section "Intel TV Sport 1004 (D-670/37)" (retrieved 2026-10-18). Community wiki: the Intel TV Sport 1004 "was also called the Gamatic 7600"; board labelled "F'GAMATIC-7600"; TMS-1965; power supply "AC/DC 9v 40mA 360mW or 6x1.5v "C"(R12) batteries".
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 Facele (Texas Instruments collectors' museum, Rieti), "TMS1965" (retrieved 2026-10-18). Pin table for the TMS1965: pin 2 VSS (earth), pin 4 supply, "the voltage must be between 6 and 7 Volt", pin 3 sound output, pin 16 sync output, pin 17 2 MHz clock input, pins 9 and 10 right and left player outputs, pin 6 ball output, pin 24 score and field output, pins 11 and 12 right and left bat inputs, pin 5 ball angle, pin 7 ball speed, pin 8 manual serve, pin 13 bat size, pins 18 to 23 game select, pin 25 reset, pins 26 and 27 shot and hit, pins 1, 14, 15 and 28 not connected; described as pin-compatible with the AY-3-8500. The page also shows an application circuit for the "TMS 1965 NLA": a 10 µF capacitor across the supply; each bat set by a 1 MΩ potentiometer with 10 kΩ in series, a 220 Ω resistor and a 0.1 µF capacitor; game, angle, speed, serve, bat-size and reset switches to ground; a 2 MHz oscillator; the sound output driving an 8 Ω speaker through a 2N2222 transistor, 15 kΩ, 0.2 µF and 51 Ω; the video outputs combined in TP4072 OR gates and a 330/510/220/510 Ω resistor network to the modulator.
  10. ↑ 10.0 10.1 10.2 10.3 Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (7).jpg (CC BY 4.0, from Wikimedia Commons), with the photographer's description "Exploded and detached capacitor (together with a resistor)", examined at full size: a lavender-sleeved capacitor printed "SAMHWA" and "470µF16V" with a negative-lead arrow and brown stains on the sleeve, a crumpled grey mass, and a resistor whose body is charred so that its colour bands cannot be read.
  11. ↑ 11.0 11.1 11.2 11.3 Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (5).jpg (CC BY 4.0, from Wikimedia Commons), examined at full size: the upper case from inside with the base removed. The board, solder side outwards, is screwed to the case at its four corners; the KDC UM-1111E 30 modulator sits on a metal plate held by two screws; slide switches are mounted on metal brackets along the top edge; each control-box lead enters through a metal clamp held by two screws; the speaker is below the board; all connections are soldered flying leads; fibrous debris is scattered across the board and the case.
  12. ↑ Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (1).jpg (CC BY 4.0, from Wikimedia Commons): the rear panel, with the RF lead at the left, a hole labelled "HORI - HOLD" and a socket labelled "AC 9V ADAPTOR" at the right.
  13. ↑ Photograph by José Antonio Ortigueira Amor, File:Grandstand Adman TV Game 2000 (4).jpg (CC BY 4.0, from Wikimedia Commons): the right-hand control box, its coiled lead entering the side of the box and continuing straight into the side of the case.
  14. ↑ Facele (Texas Instruments collectors' museum, Rieti), "Pong TMS1965" (retrieved 2026-10-18): the Polistil Pong console, built on the TMS1965; troubleshooting note on a second Polistil console fitted with composite video and audio outputs, for which the power supply section was redesigned around a 7805 regulator and two 1N4148 diodes to give 6.3 V DC, and a CD4072, a BC547 transistor and a few resistors and capacitors were added for the video and audio outputs.


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