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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
CRT Vestel 11AK37-11 trouble shooting



New User

Oct 17, 2021, 11:45 AM

Post #1 of 2 (292 views)
CRT Vestel 11AK37-11 trouble shooting Can't Post


I am trying to trouble shoot a CRT TV with a Vestel 11AK37-11. It started when Q801 shored in the smps, I managed to get the TV working again by replacing Q801 and the IC800 controller, and also the Q601 HOT. Everything worked OK for a couple of weeks and then static on the screen started randomly. Eventually it go to the point where the TV would jump into standby, finally blowing the Q601 HOT.

I have replaced the Q601 HOT again, the TV works powers up OK, but the static seems to be happening again, and jumps into standby. If I leave it running it will probably blow the HOT again.

I have check all the diodes and resistors and all looks OK. I don't have any specialised equipment other than a dmm.

I have followed all the items on this previous post

Any ideas what would be causing the static?


New User

Nov 1, 2021, 3:38 PM

Post #2 of 2 (208 views)
Re: [gregh] CRT Vestel 11AK37-11 trouble shooting [In reply to] Can't Post

Well, I removed the HOT Q601 from the board (which seems to be OK), and powered up. The B+ was 151.75v and reasonably stable. I could hear the static clicks, but the B+ voltage did not fluctuate. Alas, it jumped into stand by.

Am I right to assume the problem is in the power supply? as without Q601 there is still the static clicks. Possibly the capacitors around Q801/IC800 which may have been damaged when initially shorted. The clicks have progressively got worse, as the capacitor starts failing? (bad ESR as none are shorted) The resistors measure OK.



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