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Equipment Repairs => LCD TV forum => Topic started by: brian on December 28, 2007,05:59:27

Title: UPDATE ON TECHNOSONIC LCD3251/MEDION 30112
Post by: brian on December 28, 2007,05:59:27

HI
AFTER CAREFULLY FITTING MOD KIT63,(MANY THANKS TO TMG).UNFORTUNATELY,AT SWITCH ON POWER SUPPLY STILL DEAD,BUT AT LEAST NO MAINS  FUSE BLOWING. THERE ARE SOME VOLTAGES TO BE FOUND BUT WITH NO CIRCUIT DIAGRAM, THESE ARE PRETTY MEANINGLESS!,
HELP!!!
 WISHING YOU ALL A HAPPY NEW YEAR
 BRI.

Title: Re: UPDATE ON TECHNOSONIC LCD3251/MEDION 30112
Post by: Tmg on December 29, 2007,10:18:52

Bri
change any 1000uf caps eg c330 ?

Maxim 26"+ Power Supply Repair Kit 
There is now a power supply repair kit available for Maxim 26"+ Power supplies (with and without sound output stage).
Firstly, measure the primary side resistance of TR20, it should be approximately 4 ohms on a good working transformer. If it is not 4 ohms, the transformer needs replacing before fitting the repair kit.

The power supply repair kit includes:

F300 - F3.15A - 067420001811
D315 - 12V Zener - 048320605201
D318 - 2.4V Zener - 048100255131
Q300 - BC337 - 046247018001
IC21 - FSD200 - 045000000281
IC30 - ICE1QS01 - 045000003631
D325 - 1N4007 - 04832142301

Applies to PSU pcb which do not have the sound output stage built onto the power supply.

C210 1000uF 25V 20% 105°C replace with -> 470uF 35V 20% 105°C
C211 delete.
L200 20uH 2.5A replace with -> Jumper Wire