[TechAssist] Re: MTC 14" TV, MTV-1428 relay clicks no HV.FIXED!
- From: "Jeff Dougherty" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 7 Dec 2002 11:45:46 -0500
Kevin,
Only thing I an think, when the first one went, perhaps the micro shut the unit
down saving the second resistor and possibly other parts.
I've seen this lots of times...you think more parts would be blown...
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: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 06, 2002 10:24 PM
Subject: [TechAssist] Re: MTC 14" TV, MTV-1428 relay clicks no HV.FIXED!
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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