Roleplay in the 25th century with Buck Rogers.Full description
Roleplay in the 25th century with Buck Rogers.Descripción completa
Fantastic booklet accompanying the Mosaic Roost box set.
Descripción: how to make wood skill box
Indian Television users are witnessing digitalization that is set to enhance their viewing experience. The television digitalization is set to make set top boxes ubiquitous devices that will transform our perception of TV and viewing experience. With
Descripción completa
FAULT CODESDescripción completa
AB 330 SYSTEMs FAILUR PROCEDUREFull description
Guide For Fault Analysis
Full description
Full description
Set
geologi struktur
Descrição completa
GOOD
Deskripsi lengkap
Descrição completa
Full description
Calculation of Fault
Descripción: Rocas de Falla y Mecanismos. Una Clasificación textural. Factores que influyen en la formación de rocas de falla. Physical factors likely to affect the genesis of the various fault rocks--frictio...
DON'T MISS Not Common To See Dual Super Barrier Rectifier Breakdown When Und Home > Guest Post > Humax Set Top Box Fault Finding
Humax Set Top Box Fault Finding By Jestine Yong on June 21, 2016 Like
0
Tweet
Name:
Email:
In my busy schedule in my office I got call from my home, my daughter complaining that the Cable TV was not working (summer vacation enjoyment with cartoon Channels). I have guided her some troubleshooting but the straight answer was, there was no power light indication i n set top box. So I told her not to turn ON the TV or set top box till I reach home.
On reaching home in the evening I have checked the set top box and it was not working at all. This set top box is manufactured by Humax.
LED TV RepairCheap Replacement Parts The complaint... Posted 4 hours ago
CRT TV RepairFlyback Replaced This LG...
So I have opened the box for troubleshooting. There was no visual burn mark or any other physical damage on circuit board. I have checked power adapter with multimeter and it showed 12 VDC which was good.
Posted 4 hours ago
Power IC And Zener Diode Shorted In DVD Player Repaired ... Posted 2 days ago
CFL Bulb Repairing Tips- You Can Do It ... Posted 2 days ago
New Sharp LCD/LED Philips Plasm/LCD TV Case History Volume 1 Ebook By Damon Check out... Posted 7 days ago
No Power In ATX Power Supply Repaired-3 Components Replaced
Received...
Posted 7 days ago
LIKE US ON FACEBOOK
Checked power sec tion on PCB and I am not sure which component was this because checked with multimeter it was showing full continuity from both side assuming this is fuse I have moved further I am getting 12V on both the capacitors in power section that means power section is ok.
Be the first of your friends to like this
Noahtech Electronics Training May 11
Completed One To One Advanced Electronics Repair Course For A Participant From Bhutan Rest of the ci rcuit it is difficult to troubleshoot without proper Circuit diagram. The back side of the circuit board I found some SMD Components. Assuming transistors
W or
On testing with Multimeter I found the entire transistors OK except 2X transis tor
r
So right now I am near suspected faulty area but want to confirm by replacing the transistor if I can arrange form some old junk PCB because buying new one is not worth but to fulfill my curiosity diagnosed till these stage. Till the repair my children’s are not going to wait hence ordered new Set top box because now school summer vacati on is near to end. Now I am looking for Circuit diagram. If a nyone has some suggestions please s hare in the comments.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
Please give a support by clicking on the s ocial buttons below. Your feedback on the post is welcome. Please leave it in the comments. P.S- Do y ou know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.
Note: You can check his previous article in the link below: Laptop Intermittent Battery Charging Fixed Likes
12)) (12
Dislikes
Set Top Box Repair
(0)
Like
0
Tweet
RELATED POSTS
7 COMMENTS
Albert van Bemmelen June 22, 2016 at 12:29 am
Yogesh are you sure the X2 is a npn transistor? They could according to their SMD code also be Zeners? In case of BZX99 a 13V 0.3W, or in case of BZX84 a 30V 0.3W, or in case of BZV49 a 30V 1W zener? (all being sot23) See also http://english.electronica-pt.com/smd-databook?ref=x2 I did look for Humax on ElektroTanya but only found a inter esting PDF with name : humax_oak-ii-large_5100_5300_5350_5400_5500_5550_5600_5700_ver-1.0_sm Likes
(1)
Dislikes
(0)
Reply
Albert van Bemmelen June 22, 2016 at 12:47 am
Oops: the 2X instead the x2 is indeed only the 2N4401 type transistor. I guess it is just a question of replacing the bad one. But with those often badly standardized or hidden codes you never can be 100% sure. Likes
(1)
Dislikes
(0)
Reply
Humberto June 22, 2016 at 10:09 pm
Hi Albert and Yogesh, here's another type of 2x (2X M) https://docs.google.com /viewer?url=http://www.onsemi.com/pub/Collateral/MMBT4401LT1-D.PDF Likes
(1)
Dislikes
(0)
Reply
Albert van Bemmelen June 23, 2016 at 5:53 am
Hi Humberto. Indeed often the first characters of the components typenumber look like different typenumber versions of in fact just the same SMD Component. MMBT or STK or 2N are probably all the same NPN Transistor. I found the STK4401 several times in the Humax PDF Service Manual file I mentioned in these Post to be used for switching through
electronic videosignals f or Scar t VCR, Scart TV and other connectors. (the f1-fox_service_manual_197.pdf) I had bought the 2014 edition Turuta SMD-code Book previously but still it is impossible to find all codes that exist. Some codes I still couldn't find anywhere. Likes
(0)
Dislikes
(0)
Reply
Yogesh Panchal June 22, 2016 at 6:47 pm
Albert, Here is the Link for 2 X transistor http://www.s-manuals.com/pdf/datasheet/k/s/kst4401_fairchild.pdf Likes
(1)
Dislikes
(0)
Reply
Albert van Bemmelen June 22, 2016 at 10:26 pm
Understood Yogesh! Must be equal to the 2N4401. I am afraid that finding a matching Humax Tata Sky Box Ser vice manual will be very diff icult. But often it helps to google the number and version of the printed circuit board used to find the much needed info. While searching for Humax T41 CPU B/D rev1.0 I found this Humax Service Manual that also uses the kst4401 transistor you mentioned. See this link: http://monitor.espec.ws/files/f1-fox_service_manual_197.pdf I hope this helps. Likes
(0)
Dislikes
(0)
Reply
Humberto June 22, 2016 at 10:12 pm
Good repair Yogesh. Any published article is a source of information for readers. Congrats. Likes
(0)
Dislikes
(0)
Reply
LEAVE A REPLY Your email address will not be published. Required fields are marked * Comment
