Megmeet MLT198A/TL secondary capacitor replacement.



The Megmeet MLT198A/TL power supply can be found in Insignia models NS-LCD42 and NS-LCD42HD, (Insignia PN:860-AZ0-MLT198AH).Typically a paper sticker with 'Proview' printed on it will be strategically placed to cover the Megmeet name! The TVs themselves are related to Polaroid sets and were almost certainly have a common manufacturer. The Insignia NS-LCD42 suffers from power supply failure, the good news is the failing components are secondary smoothing capacitors. So one day the set will just no longer power on.
Note: The primary side of a switch mode power supply will have potential lethal voltages when running, and that big smoothing capacitor can hold a nasty bite for a while after it is powered off.
Whilst you can replace the PSU for around $90+ chances are the replacement will have the same, original capacitors.
Below shows the replacement of all of the secondary capacitors, with good quality Japanese capacitors which with shipping from Mouser.com came to around $10!
Ideally, to perform this repair you would use a good high temperature soldering iron as the heatsink will do exactly then making it hard to melt the solder on the rectifiers and the heatsink, a good solder sucker and desoldering braid will help. Alternatively, if they still exist, a TV repair shop should fix this easily.


Datasheet of this switching power supply (SMPS):

Part Name: MLT198TL; Power:270W
Size (LCD): 37-42 LCD
Panel (LCD): Most brands
Input: 100-240VAC 50/60Hz
Output: 24V/9A & 12V/2.5A & 5V/4.5A & 5VSB/0.5A
Working temperature:-5~50
EMC Standard: EN55022 Class B,
Install size: 260 x 130 x 32mm
Install hole:250 x 120mm



Secondary Capacitors
 EA3, EA4, EC2, EC9, EC10 1000uF 16V 105
 EA5, EA6, EA7 470uF 35V 105
 EA8 220uF 35V 105
 EA9 100uF 35V 105
 C19 470uF 16V 105




Mouser Logo
Sales Rep Ship Via Terms Order Date
Internet Customer Service FEDEX GROUND CREDIT CARD 12/31/10
Line
No.
Supplier Number
Customer Part No.
Description
Estimated
Shipment
Date(s)
Qty Unit Price
USD
Extended Price
USD

1
RoHS: Compliant1
667-ECA-1CHG471
470uF 16V
12/31/1010.5000.50

2
RoHS: Compliant1
667-ECA-1VHG101
100uF 35V
12/31/1010.3000.30

3
RoHS: Compliant1
667-EEU-FC1V221L
220uF 35V
12/31/1010.5400.54

4
RoHS: Compliant1
667-EEU-FC1V471
470uF 35V
12/31/1030.7002.10

5
RoHS: Compliant1
647-UVZ1E102MPD1TD
1000uF 25V 20%
12/31/1050.2501.25



1RoHS: Compliant


FreightMerchandise Total
USD
$4.69
Shipping charges will be added at time of shipment

ALL ORDERS ARE SUBJECT TO ALL TERMS AND CONDITIONS DISPLAYED AT:
www.mouser.com/saleterms




PSU just removed with bad capacitors
PSU with bad capacitors.

Revealed all of the Green Samxon capacitors have blown, see the bulging tops
Bad Samxon capacitors!

Whole board view,heatsink and rectifiers removed
Whole PSU minus heatsink

Whole board with all secondary capacitors removed, don't trust any of them to be reliable!
Bad capacitors removed

Nichicon and Panasonic capacitors 105 and the same physical size
New Nichicon and Panasonic capacitors arrive

All secondary capacitors replaced
New capacitors installed

Heatsink and rectifiers back in place
Heatsink and recifiers back in place, PSU good to go