Question about Planar PL2010M 20" Flat Panel LCD Monitor

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Only Power LED on when power on

I replaced all 8ea of Cap.from Digikey but still same thing.
Any idea?

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  • BiggestDawg May 11, 2010

    I replaced the caps that didn't work. I still get the momentary flash and then black. I tried disconnecting the ribbon but only got black. I don't find any fuses all the other caps look good. What am I missing here?



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  • 53 Answers

LED is on that indicates the power supply is working, so most likely you have there problem with inverter/backlight. To see easier how backlight behaves, unplug flat cable from processor board, so display itself won't be powered and light will go through it. Now if you turn on the monitor you will see the screen turns white for some short time and then turns off again. That's because CCFL driver chip turns into protection.
If you won't see any light, check the fuse on inverter and FETs in primary of inverter transformers.
If those are ok, next, you can localize the lamp, causing the problem - disconnect them one by one substituting with 27pf 3kV capacitors (equivalent load) and try turn on again until white light will stay for longer (while the controller is recognizing the signals from VGA input).
Post here the picture of inverter board (from the driver chip side).

Posted on Sep 10, 2009

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Are you getting 160vdc voltage on that new cap?
How about the cap in the secondary DC side for the 5v and the 12vdc?
It also not good idea to double up on the capacitance since the in-rush will be higher when this cap is charged up and it can blow the main AC fuse or damage the bridge rectifiers, 10~20% higher will be OK.
When the DC filter went out, the circuits will be fed with AC and it can damage the circuits.
Service manual;
Need more details on the DC reading.
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
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Attach a 12v bulb to the 12v output of the power supply, do not turn on the power switch because we just wan to lod the power supply with the bulb only, see if the lamp cycle on and off.
Check the DC voltage on the large cap (the one with 250~350vdc rating) on the AC primary side, it should have about 160vdc on it.
Use the hair dryer set to low and heat up the small cap by SMP IC on the heatsink as shown in picture DSCF0585 to see if the output 12vdc is on steady.

All the caps have flat tops and you replace them as a set?

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

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Check the DC filter caps first.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for:
Post back what you see inside so we can guide you further and it will help out other people in the future also.
Capacitors kit:

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You have monitor with a very common problem, a dead power supply. After 2-3 years many LCD monitor power supplies will fail just like you have described. The problem is caused by parts called capacitors overheating in the tight space of the monitor case. If you can solder then you should be able to do the repair yourself. We will have a repair guide posted 12/29 after about 5:00 central time that should get you back going again. The repair guide will be on our web site at: If you have any questions please let me know at the address below.

I hope this helps, if so please rate our solution.

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1 Answer

T.v. won't turn on

The following parts can be purchased at or web site. I am also posting all of the things I have found so far with these TVs.

Here are few possible solutions:

If you have no red light and you have a Megmeet MLT386 power supply, check these parts:

1) Swollen caps on the secondary circuit (may cause the red light blink problem, but also see below).
2) Blown fuse F1 (5A/250V) this is caused by a shorted FET at QA1 (20N60), you may also find that SMT cap CX23 is burned up (.001uf) which is in parallel with diode DA2 which may be damaged/shorted, replace these components.

If the power LED goes from red to green when powered up but no picture, then it might be lost +24VDC from the power supply:

3)Check fuse F2 (3.15A/250V, I put a 5A in), if it is blown, replace FET at QA2A (9N50C), replace QA2 as well (9N50C). Check SMT resistors at R233,R234,R235,R236 (.47 ohm). If open, replace with .1 ohm 1W or 2W resistor (easier to source). Also replace SMT transistor QF1 (2X4 or 2N4401 NPN transistor). And replace diodes at DS2 and DS1 (HER207), DS2 was shorted, DS1 was ok but I replaced it anyway.

I dont know as much about the Megmeet MLT169A, but it has similar problems and similar components.

4) I had to replace all of the capacitors in the secondary circuit (there are six in a 3x3 row marked EC9 (1000uf35V),EC10(1000uf35V),EC14(470uf35V) and EC18,EC19,EC20 (all 1000uf35V).
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