MAGNAVOX TELEVISION REPAIR AND TROUBLESHOOTING  TIPS

_Magnavox Tv repair tips, circuit board faults, audio & video faults, you can find out here if you have the same problems or symptoms of your Magnavox televison.


MAGNAVOXS TV REPAIR TIPS

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  • Magnavox 64pp9751 unit has poor focus     register in service mode set wrong (062596 menu). Cure: change register 026 from 1f to 26, the electrical focus may need to be reset after the change to get the best focus. If electrical focus is reset it only needs to be reset on one mode. Reg 026 however has to be changed in all 6 modes. See below for the modes vga – video – ntsc (640x480) vga – pc (640x480) svga – video (600x800) svga –pc (600x800) hd –video (1920x1080) hdpc (1920x1080) Cr4510     cr4510a103 tv will not turn off.     Ic430 and q400 r438 q402 must be replaced
  • Magnavox ms3252s431 chassis l011u ac7638. Horiz squeal at turn on, horiz freq off set shuts down. After several attempts to power up unit will come on and usually stay on. Checking capacitors in the horizontal drive circuit the tech found cap 2455 a 47mf25v in hdt circuit defective. Replacing the device the symptom was cured.
  • Magnavox mt1901 low level hum from the speaker may be present in some of the above models. The hum is not noticed at normal volume levels, but can be heard at low or minimum volume in a quiet room     the hum leaves with the chassis pulled back from the cabinet. Cause: crt field pickup by c804 and c808.
  • Magnavox mt2501 in the following tip you must release the onset keyboard as soon as the "f" disappears (about 4 seconds). Failure to release the keyboard will allow the tv to return to factory mode. Symptom: in factory mode with f in upper right corner of screen cure: press volume up and channel down for 5 seconds at onset keyboard. Rr2541
  • Magnavox rr2541 set is dead. Q400 is shorted. Replacing q400 still does not bring back the operation of the set     checking the standby voltages found all standby supplies were dead. Checking the reference zener for the standby source found that z406, a 6.2 volt zener was shorted. Replacement corrected the dead set.
  • Magnavox pr1917 does not have control over the volume control. When the volume is raised up the bar graph on the screen increases and decreases but the level of audio does not change     i had tech look at pin 2 of the microprocessor. It is the volume control output. It varied from 0 ~ 1.5 vdc. . The volume is controlled by a voltage amplifier/audio output ic # 7106 pin # 4 is the volume control input. Mute function causes the line to get to "0" volts where the volume control operated as expected. Replacement of this audio output/voltage control amplifier corrected the trouble.
  • Magnavox pr1910. Goes to demo mode pressing volume up and volume down at the same time starts the demo mode pressing
  • Magnavox pr1930 low level hum from the speaker may be present in some of the above models. The hum is not noticed at normal volume levels, but can be heard at low or minimum volume in a quiet room     the hum leaves with the chassis pulled back from the cabinet. Cause: crt field pickup by c804 and c808.
  • Magnavox ps1953 19x6 chassis unit looses horizontal sync Intermittently lift 1 side of diode d406 and the symptom stopped. This set will not shut down in the conventional sense. It will loose horizontal sync or frequency. After confirming the correct operation of the power supply and the high voltage system d406 was replaced because it was leaky Rs2756 c402     no power to magnavox tv model# rs2756 c402 chassis 28y100-00aa. No lights, noise, etc. Dead     is the main fuse blown? If yes, there's a problem in the primary side of the power supply. If no, check the following: 1) do you have 300/160v over the main capacitor. 2) is the primary-power-transistor "working"?
  • Magnavox tp2590 unit is stuck in the demo mode the demo mode is used by dealers to advertise features of the tv on the screen while the set is on display. To toggle in and out of demo mode, press "volume up" and "volume down" at the same time at the front panel keyboard


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