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RON_CET replied to Funai/Magnavox 32MF301B/F7 Picture color washed out and flipped upside down

in Troubleshooting TVs and Video Sources

07-14-2017, 11:02 AM
Re: Funai/Magnavox 32MF301B/F7 Picture color washed out and flipped upside down

There several different main board versions for this model# make sure you have the correct main board you can identify this by matching the 1st 3 characters of the serial#
(Example DS7= A1AFCMMA-001 (MAIN).... ME4= A17FAMMA-001-DM (MAIN)

Also if you do have the service manual,look for the "SCALER" setting you might try that adjustment,this changes the rotation of the picture

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RON_CET replied to Funai/Magnavox 32MF301B/F7 Picture color washed out and flipped upside down

in Troubleshooting TVs and Video Sources

07-13-2017, 07:49 AM
Re: Funai/Magnavox 32MF301B/F7 Picture color washed out and flipped upside down

How to set up the service mode:
Service mode:
1. Turn the power on.
2. Press [MENU] button to display Setup menu.
3. Select “Features”.
4. Select “Current Software Info”.
5. Press [0], [4], [2], [5], [7], [4] and [INFO] buttons on
the remote control unit in this order

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RON_CET replied to Magnavox 46ME313V/F7 LCD shuts off immediately after displaying splash screen

in Troubleshooting TVs and Video Sources

02-24-2017, 06:51 PM
Re: Magnavox 46ME313V/F7 LCD shuts off immediately after displaying splash screen

The Voltage that should be present @ Protect 3 should be 3.3 volts once the backlight drive circuit turns on...and will constantly be there unless something @ the panel or the backlight drive circuit forces that Protect line low.If that voltage goes low (0 volts) most likely your having a led failure within the panel...

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RON_CET replied to Service manuals available free

in Troubleshooting TVs and Video Sources

02-17-2017, 08:38 AM
Re: Service manuals available free

Follow part 1 page 2-4 of training manual of putting set into the self diagnostic mode
NOTE!! you must first power set on normally and let set shutdown first before trying to enter self diagnostic all this is done from set front panel buttons.... when I was servicing these sets don't remember a code 21...

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RON_CET replied to Service manuals available free

in Troubleshooting TVs and Video Sources

02-13-2017, 08:42 PM
Re: Service manuals available free

Here ya Go..... also a bonus the training manual...

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

04-05-2014, 07:03 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

the Philips part# 934057587118 which not many vendors have or this eBay replacement might work...

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

04-01-2014, 07:19 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

I personally have only used variable dc supplies when I'm applying gate or base voltages to a solid state device which allows not only to bring up the operation of the device slowly but also allows me monitor current drain also,but you can try your wall wart but the gate voltage must be higher than you drain source to make the junction conduct.

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-30-2014, 08:15 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

you can test out of circuit with similar hookup to circuit in set with pins 5678 @ 5 volt supply voltage pins 2/4 hooked to variable dc supply pins 1/3 to load source then run you variable dc up on pins 2/4 once you get above the breakover voltage which would be above your drain supply voltage then you would see output at your source.NOTE your are referring to 7u25?

mouser has these [url]http://www.mouser.com/ProductDetail/Vishay-Siliconix/SI4936ADY-T1-E3/?qs=sGAEpiMZZMshyDBzk1%2fWi0TYhWz8NYhw9O8gPDPreyc%3d[/url]Re: PHILIPS...

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-29-2014, 09:07 AM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

sounds like your heading the correct path and your troubleshooting steps look good

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-27-2014, 02:50 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

I'm out town and away from the schematics but, check the 12 volt supply from power supply,you can use fig 17 from training guide for checks

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-26-2014, 03:03 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

1.2V for the output of 7m06 is correct,upon power on are you seeing the 12vsw @ 3U39?
what is the base voltage of 7U24 before set is powered on? what is base voltage of base 7U24 after set powered on? yes your reading right that AJ15 pin feeds through 3u42 to base of 7U24

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-26-2014, 11:04 AM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

standby processor gets its vcc @pin AK12,which is derived from 7M06

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-25-2014, 07:30 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in order for the source of 7U25 to go to 5v base of 7U24 must go high turning on 7U24 therefore putting the collector of 7U24 low through the gnd path of the emitter of 7U24
turning on 7U25 gate with the 5v sitting on drain for developing the source 5 volts

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-25-2014, 10:17 AM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

Look @ the voltage from 7U25 transistor pin 1 and 3 for 5V this is a run voltage refer to fig 8 in the training manual this 5v run voltage is what is monitored by the standby processor IC 7J00

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RON_CET replied to PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

in Troubleshooting TVs and Video Sources

03-24-2014, 05:19 PM
Re: PHILIPS 42PF7421D/37 Chassis EL1.1 U AA

6 blink code is missing 5 volt error see attached training guide...

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RON_CET replied to Samsung pn50b550t2fxza

in Troubleshooting TVs and Video Sources

03-16-2014, 08:15 PM
Re: Samsung pn50b550t2fxza

maybe this could help...

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RON_CET replied to firmware Samsung PN50A4501DXZA

in Troubleshooting TVs and Video Sources

03-15-2014, 12:41 PM
Re: firmware Samsung PN50A4501DXZA

attaching part of service manual

Note!!!! This is for the PN50A450P1DXZA...

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Last edited by RON_CET; 03-15-2014, 12:46 PM.
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RON_CET replied to firmware Samsung PN50A4501DXZA

in Troubleshooting TVs and Video Sources

03-15-2014, 12:34 PM
Re: firmware Samsung PN50A4501DXZA

Try this attached

Note!!!! This is for the PN50A450P1DXZA Did you leave out the (P) in your model???...

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Last edited by RON_CET; 03-15-2014, 12:45 PM.
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RON_CET replied to Philips 42" 715T2432-2 issues

in Troubleshooting TVs and Video Sources

03-07-2014, 01:14 PM
Re: Philips 42" 715T2432-2 issues

I have used this power kit from ShopJimmy which fixes most of all the common issues on this board including the power supply "chirping" out of about 15 boards I've done haven't had replace any of the switch mode transformers mention in above posting see attached for kit...

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RON_CET replied to Toshiba 37AV502R

in Troubleshooting TVs and Video Sources

03-01-2014, 10:07 PM
Re: Toshiba 37AV502R

This might help some see attached,I'll try dig up schematic when get back to office Monday and I'll post that...

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