Question about Theater Research TR-8000 System

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I need the schematics or at least the chip number on the IC Output circuit, can you help me?

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Hello i need schematic diagram for power supply Model MEGMEET - ML686 . that power supply used for LCD TV .it's bad Brand and nobody care in service center. hope somebody help

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
Check the present power supply [SMPS]; and find out the number of switching regulator IC used. Surf the site with that IC number. You will get similar circuit for SMPS there.

May 04, 2015 | Televison & Video

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Sir i have sansui leader 500 main iv no tda 12135 Vertical ic ok vertical not open

Check and replace the vertical scan output IC. Check related capacitors, and solder terminals at the vertical scan output section circuit for any loose soldering. Check the voltages at the vertical scan output IC. Refer its circuit diagram [schematic] for more details. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

Apr 03, 2015 | Sansui Televison & Video

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A friend of mine has a Casio keyboard CTK-691 which is not functioning. He asked me for help. I have another friend who is a radio repairman (professional). He has found out that the IC with position...

Here is a schematic for a CTK680... might be close to your CTK681...

Scroll down to "get manual" and click to download it. IGNORE other download links on the page.

Assuming this is the correct schematic, IC12 is shown as a TC750BF which is an open collector driver for the MIDI. If this part is bad, the MIDI output drive signal to an external device will not work. Without an external device connected, the output of this chip WILL NOT change as it is an open-collector driver and without the pull-up of the external device the output will remain at zero... so if the tech is testing this particular part AND the symptom is NOT that the MIDI signal to an external device is not working, then he is on the WRONG TRACK. Often radio repairmen do not understand logic chips and their variations.

Aug 15, 2011 | Casio Ctk691 Keyboard

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On power up I hold the power button down, I can hear some sort of relay kick-on, sometimes a horizontal white line appears across the screen, then it kicks-off, and the red led blinks four times...

White line across the screen indicates that tv got vertical deflection failure problem that may be due to vertical output chip failure. If that kind of problem occurred, tv select protection mode and red light starts blinking 4 times.
Please check vertical output chip in tv main board and replace it to solve tv issue. This job needs soldering work so local tv repair shop will help you.

Feb 01, 2011 | Sony FD Trinitron WEGA KV-24FS120 24" TV

1 Answer

I think I have a bad vertical output IC (U401?) Mitsubishi vs 5043. Where is this IC located?

u401 IS THE LOCATION OF THE IC which is mounted on a small metal heat sink---chip should have 7-13 pins depending on one used.

It will usually be marked top and bottom on circuit board and is usually to the right of the middle of all the boards.

I would suggest based on the model number that if you locate it look closely at the solder connections that connect it to the board; a lot of these sets develop broken connections there from the heat the chip produces--you may only have to resolder the chip to fix the problem.

Let me know if you need help---if this has been helpful rate this solution as "very helpful" as I do this here for free.


Aug 10, 2010 | Mitsubishi VS-5043 50" Rear Projection...

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Oscillator out. No radio and clock is locked up

could be a 555 ic. 555 is the widest used timer ic or "clock" chip. you will need to check the gates of this ic.

May 06, 2009 | Car Audio & Video

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Power On + red LED turns on + but final relay (click) don't come so no sound

Your audio output transistors are shorted and your unit is staying in "protect " mode to protect your speakers from 40 to 60 volts that is being sent at them from the shorted outputs. If you can use a meter you won't need the schematic MOST likely because the outputs are USUALLY the only parts that short out. The output transistors( or chip ) are mounted to the large, finned heatsink. The #'s on the transistors start with "2SA-" and "2SC-" followed by numbers. There are two output transistors per channel. If your unit uses an IC for audio output then the # on the IC will be "STK-" followed by numbers. These parts are available from Good Luck!


Oct 17, 2008 | Denon PMA-2000R 2-Channel Amplifier

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if you can remove the rear panel assy. look for the convergence ic's they start with stk--- and you got the part number you need a source panasonic is 814 source and the number on the ic's stk 390 ----/

Aug 22, 2007 | Panasonic PT-53WX42 53" Rear Projection...

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