REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

How to use the site:
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday 18 March 2020

REPAIR / SERVICING TV HAIER L37A9A

Technical description and composition of the HAIER L37A9A TV, panel type and applicable modules. The composition of the modules.
Haier
Model: L37A9A L37A9A-AK
Chassis / Version: PY12026-Q
Panel: LC370WX1 (SL) (02)
T-CON: LC370WX1 / LC320W01 P / N: 6870C-0060F 2Layers; TL22710D
Inverter (backlight): MASTER 6632L-0199B, SLAVE 6632L-0200B
PWM Inverter: OZ9936I
Power Supply (PSU): AD301M24-4N1 A404CV8.1A
PWM Power: TNY266P
MainBoard: PY12026-Q (V2.1) PX4R433-Q P / N: 0-3298-009006-01
IC MainBoard: MST6151DA-LF, IS42S32200C1-6TL, LM2596S, LV1116N, TDA1554Q
Tuner: JS-6H1 / 111A25HR
Appearance
HAIER L37A9A
General recommendations for repairing TV LCD
Possible malfunctions
- The Haier L37A9A TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In the vast majority of such cases, a malfunction is detected in the AD301M24-4N1 power supply module. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM) TNY266P. It is checked only by replacement with a known good one.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the PY12026-Q motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MST6151DA-LF, IS42S32200C1-6TL, LM2596S, LV1116N, TDA1554Q with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
The malfunction of the JS-6H1 / 111A25HR tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
TV users and owners must remember that attempts to self-repair a Haier L37A9A TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!



INVERTER: LC370WX1 MASTER 6632L-0199B ITW-EE37-M (S) Rev1.1
INVERTER: LC370WX1 SLAVE 6632L-0200B ITW-EE37-S (S) Rev1.1



The appearance of the MainBoard PY12026-Q is shown in the figure below:
PY12026-Q
PY12026-Q can be used in TVs:
Haier L32A8A (Panel T315XW01 V.5), Haier L37A9A L37A9A-AK (Panel LC370WX1 (SL)(02)).
The appearance of the power supply
Main features of the HAIER L37A9A device:
Installed matrix (LCD panel) LC370WX1 (SL) (02).
The matrix control uses the Timing Controller (T-CON) LC370WX1.
A MASTER inverter is used to power the backlight, controlled by the OZ9936I PWM controller.
The necessary supply voltages for all nodes of the TV HAIER L37A9A are formed by the AD301M24-4N1 power module, or its analogs using TNY266P microcircuits.
MainBoard - the main board (motherboard) is a PY12026-Q module, using microchips MST6151DA-LF, IS42S32200C1-6TL, LM2596S, LV1116N, TDA1554Q and others.
The JS-6H1 / 111A25HR tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC370WX1-SL02
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 9.0 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V

Posted By: FRANK at 08:26
TAG: , , , ,