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Grandstand TV Game 2000 Capacitor Replacement Guide

From RetroTechCollection
Grandstand Adman TV Game 2000 (7)
The parts removed from a TV Game 2000: a SAMHWA 470 µF 16 V electrolytic that burst, a crumpled grey mass beside it, and the resistor that the burst knocked off the board, its body charred.

The Grandstand TV Game 2000 runs from 9 V on a single-sided board built around a Texas Instruments TMS1965NL, and every electrolytic capacitor on it is now close to 50 years old.[1][2] One TV Game 2000 has already had a capacitor explode inside the case.[3] No parts list or schematic for the 2000 or for the Gamatic 7600 board it uses has been found, so only one capacitor value is known for certain: that of the part that failed. The other values have to be read from the capacitors on your own board.

Opening the case is described on Grandstand TV Game 2000 General Maintenance, and other faults on Grandstand TV Game 2000 Troubleshooting Guide.

The burst capacitor

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The owner of the console photographed for Wikimedia Commons reports that it does not work. A capacitor near the left side of the board, to the left of the other capacitor there, exploded. It scattered its contents through the inside of the console, where they proved hard to clean off and some remain on the board, and it knocked a resistor off its solder pads.[3]

The photograph of the removed parts shows:[4]

  • a capacitor with a lavender sleeve printed "SAMHWA" and "470µF16V", with an arrow marking the negative lead and brown stains on the sleeve;
  • a crumpled grey mass beside it;
  • a resistor whose body is charred, so that its colour bands cannot be read.

The owner does not say why it failed. Age alone can do it, and so can reversed polarity: an electrolytic connected the wrong way round heats up and can vent. The 2000's leaflet warns that an adaptor other than the approved Adman one may damage the console, and the owner gives the socket as centre negative, so a centre-positive adaptor would reverse the supply.[5][3] Check the polarity of any adaptor before it goes near the console. Capacitor Failure Symptoms describes the general signs.

Capacitors on the board

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TV Game 2000 electrolytic capacitors (one photographed board)
Position Capacitance Voltage Read from Notes
Burst part; near the left side of the board, left of the other large capacitor (owner's description) 470 µF 16 V File:Grandstand Adman TV Game 2000 (7).jpg SAMHWA, lavender sleeve[4][3]
Large lavender electrolytic at the left edge of the component side Not legible Not legible File:Grandstand Adman TV Game 2000 (6).jpg Only "85°C" can be read[2]
Three white electrolytics with silver tops, left of the CD4071BE Not legible Not legible File:Grandstand Adman TV Game 2000 (6).jpg Printing faces away from the camera[2]
Two small lavender electrolytics, lower left Not legible Not legible File:Grandstand Adman TV Game 2000 (6).jpg [2]

The photographs were examined at full size, including the larger copies on the owner's blog. The board carries no capacitor numbers that can be read from them. For comparison only, the application circuit published for the TMS1965 has one 10 µF electrolytic across the chip's supply;[6] it is a reference design, and the 2000's own values may differ.

Replacing the burst capacitor

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  1. Take the cells out, unplug the adaptor and open the base.
  2. Clear every trace of the debris from both sides of the board and from the case, using isopropyl alcohol and a soft brush, then look at the tracks and parts underneath for corrosion. See Battery Explosion, Capacitor or Corrosion Damage for cleaning electrolyte residue.
  3. Find the empty position. The owner places it near the left side of the board, to the left of the remaining large capacitor;[3] the published photographs do not show the empty pads clearly, so confirm it on the board itself. Look also for the two empty pads of the resistor that was knocked off.
  4. Fit a new 470 µF electrolytic rated at 16 V or more and 105 °C, with the negative lead to the negative pad. If the board is not marked, trace the pads to the supply rails to find which is which.
  5. The resistor's value cannot be read from the charred part.[4] Find it from another Gamatic 7600 board, or by tracing the circuit and working out its job. Do not fit a guessed value.
  6. Before closing the case, check the remaining electrolytics: they are the same age.

Replacing the other capacitors

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  1. Photograph the board before removing anything, so that every capacitor's position and polarity is recorded.
  2. Work on one capacitor at a time. Read its capacitance and voltage from the sleeve, turning it gently if the printing faces the wrong way, and note which lead is negative.
  3. Desolder it from the solder side with a pump or braid. Copper pads on old single-sided boards lift easily, so do not hold the iron on a pad for long.
  4. Fit a capacitor of the same capacitance, the same or a higher voltage rating, 105 °C, with the same lead spacing.
  5. Record the values you find. A list for this board has never been published.
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  • Temperature-controlled soldering iron, desoldering pump or braid, flux, isopropyl alcohol and a brush.
  • Multimeter; a capacitance or ESR meter is useful for checking the parts that come out.
  • Radial electrolytic capacitors from a reputable maker (Nichicon, Panasonic, Rubycon or similar), 105 °C.
  • A current-limited bench supply set to 9 V for the first power-up.

Checks after recapping

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After recapping a TV Game 2000
Check Expected Source
Supply 9 V [1]
Current About 40 mA (360 mW at 9 V) [1][7]
TMS1965 pin 4 to pin 2 6 to 7 V [6]
Picture Steady playfield, both bats and the scores on UHF channel 30 [5]
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References

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  1. ↑ 1.0 1.1 1.2 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.
  2. ↑ 2.0 2.1 2.2 2.3 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 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. ↑ 4.0 4.1 4.2 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.
  5. ↑ 5.0 5.1 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".
  6. ↑ 6.0 6.1 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.
  7. ↑ 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".


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