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Tektronix TDS220 repair

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bd139:
Interesting. Wonder if that was on its way out on mine. I had a TDS210 that the line trigger diag failed occasionally on. It always worked however  :-//

sbeube02:
Ok, finally replaced R29.
Checked the voltage at J131 pin 7, I now have 1,8 Vppk (+1 V - 0.8 V) 50 Hz square.

I powered the oscilloscope and all self tests passed!


Probe comp is now 1 kHz!


Job done!  :)
Thank you all for helping me with this issue  :-+

bd139:
Nice work  :-+

LAB390:
Wow - what a score!
Great work (everyone) on getting this beauty back from the brink.
I'm going to bookmark this thread for future reference as an insurance policy!!!

adriten:
was trying to get inspiration from this thread to try to repair my TDS210
I bought it cheap from a local auction ; the previous owner said the display suddenly froze and after rebooting display was blank and that's what I can see when I turn it on (CCFL works)
I checked the power supply connector :all ok
Not OK is the situation on the display connector : no activity on any of the 4 DATA wires, just steady 5V;   zero volt also on pin 1 and 2 (supposed to have -10V to -25V)
pin 7, 8 and 9 are OK (ground and +5V)
Pin 10, supposed to have square wave at 1.89MHz have instead it at 1.37MHz
Pin 11 supposed to have a pulse at 19.3kHz , pulses at 17kHz
Pin 12 has very narrow pulses whose frequency I was not able to measure (very low)

On the scope front panel, instead of the test signal at 1kHz I see a pseudo sinus at 3.3MHz (?) whose amplitude is 230mV, superimposed to 2.5VDC
Mobo is the newest one with small packaging CPU, and BGA flash memory (ouch!) pcb is clean, no visible cooked components
Any help to try to catch the culprit is welcome  Attached is a pic of the motherboard

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