Riddled TV Repair Forum

muckmail · Joined: 15 Oct 2011 Posts: 27

I have a 37mf231d/37 HDTV that has a blinking light went I turn it on.
There is no picture. Form my internet reasearch I think it might be
bad caps in the power supply,
How do I open the thing without breaking the enclosure? Is there
anyone that could walk me through this type of repair? I figure it will
take several post before I can figure if it is worth repairing this TV

Thank you,

Google

muckmail · Joined: 15 Oct 2011 Posts: 27

I have the set apart and I have the power supply.
Now I need to be able to tell which caps are bad.
Is there a way to do that?
Thank you,

JTS1957 · Joined: 21 Jan 2009 Posts: 2388 Location: Far, Far Away

Found - May or may not apply to yours:

Here's the service bulletin. Replace the Scaler or Main board. But check for voltages at plug 1503 on scaler and plug 1089 on power board.

DATE: January 8, 2007

Chassis: TPE1.0U LA, TPE1.0U PA
Model(s):
26MF231D/37 26MF231D/37B
32MF231D/37 32MF231D/37B
37MF231D/37 37MF231D/37B
37MF321D/37 37MF321D/37B
37MF331D/37 37MF331D/37B
42MF231D/37 42MF231D/37B

Symptoms:
? TV will not start up (appears dead, but the front panel LED may light)
? TV will shut down after warming up
? No color
? Loss of color after warming up
? No or poor audio
? Poor picture

Cause: For the production date code ranges listed below, the output of Crystal 1H00 for the Viper IC on the Small Signal Board reduces in amplitude and/or the crystal oscillator stops oscillating.

26MF231D with date codes of 624 or lower (BZxxx624xxxxxxxx or lower).
32MF231D, with date codes of 626 or lower (BZxxx626xxxxxxxx or lower).
37MF231D, 37MF321D, and 37MF331D with date codes of 623 or lower (BZxxx623xxxxxxxx or lower).
42MF231D, with date codes of 631 or lower (BZxxx631xxxxxxxx or lower).

Solution: Replace crystal 1H00 with a new type, part number 823827736071.
Replace capacitors 2H08 and 2H09 with 4.7pF capacitors, part number 223886975478.

muckmail · Joined: 15 Oct 2011 Posts: 27

I replaced a couple of Caps described on webpage
file://localhost/E:/HDTVMagnavox/There%20are%20some%20great%20instructions%20for%20fixing%20your%20Magnavox%2037MF231D.mht
and the TV works.

Thank you,

kuhurdler · Joined: 28 Dec 2006 Posts: 2877 Location: Overland Park, KS

broken link.

Google