[TechAssist] Re: MTC 14" TV, MTV-1428 relay clicks no HV.FIXED!
- From: Kevin <kevinstv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 06 Dec 2002 19:24:39 -0800
Hi Jeff,
Thank you for the tips from the T R CD. The solution was similar to the
second tip.
After many hours and swapping of parts, the problem turned out to be 1
of 2 15K-3 watt resistors in parallel going open. R245 and R250 supply
150 volts to 9 volt zener diode which supplies 9 volts to pin 26 of IC
101. How in the world could only one go open when they are both in
parallel with each other? =20
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevinstv@xxxxxxx=20
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Dougherty
Sent: Thursday, December 05, 2002 7:58 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: MTC 14" TV, MTV-1428 relay clicks no HV.
Kevin,
From Tech Repair CD:
MTC\MTV1428CC\Factory Recall Fire Hazard\\\\R320 2.2k 1/2w Carbon Repl
With
Fusible Metal Oxide (Under Heatsink)\\\\\\\\
MTC\MTV1428CC\Nsnp. Clicks. Storm Damage. Ic201-37 Only 3.3v Off D214
Zener\\\\R238 10k 3w (2 In Parallel - 1 Open) In Startup Ckt Horiz
Vcc\\\\\\\\
Good luck.
Jeff@xxxxxxxxxxxxxxxxxx
FAX 717-564-4952
Jeff Dougherty
Intrepid Video & Electronics Be careful of your thoughts.
501 Luther Rd They may become your words
Harrisburg, PA 17111 any moment.
717-909-8844
VCR tips, electronics info & general interest.
www.intrepid-video.com www.tech-repair.net
www.thetoolcaddy.com www.9-11-2001tragedy.com
***********************************************************************
----- Original Message -----
From: "Kevin" <kevinstv@xxxxxxx>
To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, December 05, 2002 5:20 PM
Subject: [TechAssist] MTC 14" TV, MTV-1428 relay clicks no HV.
Hi fellow techs,
Relay clicks on, B+ goes to 155 volts, should be 125. No HV. Vcc for
TA8680 is only 0.6 volts, should be 9 volts for 15kHz output. Tried to
trace VCC source (9 volts) but couldn=92t find it. Does anyone have the
schematic for this TV? It looks like this TV is in shutdown mode. TIA
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevinstv@xxxxxxx
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