32MF231D/37 pulsing 24V under load, backlight flashing

[football0062]

does anyone have a service manual for this guy? 32MF231D/37 found a parts list from elektrotanya but need to see the schematic for the power supply. no load its fine right at 24V. under load of the inverters its pulsing all over and flashing the screen then shuts off. can hear a buzzing from the transformer on the power supply. replaced the power supply already but it was an ebay item. doing the same thing

[budm]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

https://www.badcaps.net/forum/showthread.php?t=39740

Inverter , power supply board P/N? BN44-XXXXXX?

[football0062]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

Pn# 313815866811

[football0062]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

inveter pn # 996510005766

[budm]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

There are four SMD MOSFETs (8-pin) on each inverter board. Can you read the P/N to get the pinout to check the Source and Drain pins for shorts?

[tvrepairguy]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

i repaired my own tv...(a magnavox).. that had that buzzing sound. i thought it was the transformer for the longest time till i tried a can of air. turn it upside down and spray the part you think it is. i found out it was a zener diode that was the problem. replaced it and the tv turned right on and worked. it was right under my transformer

[tvrepairguy]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

try spraying these and see if the buzzing changes. sound of the buzz should get higher then go back down as it warms back up

[tom66]

Re: 32MF231D/37 pulsing 24V under load, backlight flashing

450V capacitor can go bad causing this issue, if all else tests good.